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TANI Atsushi
Graduate School of Human Development and Environment / Department of Human Environmental Science
Professor

Researcher basic information

■ Research news
■ Research Keyword
  • Earth and Planetary Material Science
  • 地球惑星物性学
■ Research Areas
  • Natural sciences / Space and planetary science
■ Committee History
  • ESR応用計測研究会, 事務局, ESR応用計測研究会

Research activity information

■ Paper
  • Khalif Benzid, Atsushi Tani
    Jun. 2025, Next Research
    Scientific journal

  • Shusuke Isogai, Kazuhiko Masuda, Kazuma Dan, Atsushi Tani, Sachiko Tojo
    Mar. 2025, Atoms
    Scientific journal

  • Hyoma Akamatsu, Sakika Kubo, Seiya Kikuchi, Yusuke Tsuchida, Katsuhiko Tsunashima, Hidekatsu Hotta, Akina Yokobiki, Yusuke Funasako, Yoshiharu Okuno, Atsuyo Hamada, Hirohisa Yamada, Atsushi Tani
    A new group of tributyloctylphosphonium-based ionic liquids containing several carboxylate anions was designed, prepared and physicochemically characterized. All phosphonium carboxylates obtained in this study became viscous liquids at room temperature. The formate-based ionic liquid exhibited the highest density and number density due to the smallest anion size. All ionic liquids exhibited typical ionic conduction behavior, since the viscosity decreased and the conductivity increased with increasing temperature. It was also found that the viscosity tended to decrease with increasing the carbon numbers of the alkyl chains of lower carboxylate anions. Compared to the propionate-based ionic liquids, lactate-based ionic liquids exhibited higher viscosity. The phosphonium ionic liquids based on carboxylate anions showed higher thermal stability than nitrogen-based counterpart ionic liquids.
    The Electrochemical Society, Sep. 2024, ECS Transactions, 114(6) (6), 89 - 95
    Scientific journal

  • Keigo Kawabata, Sakura Azuma, Jin Shimada, Yusuke Tsuchida, Katsuhiko Tsunashima, Takeshi Sugahara, Atsushi Tani
    An ionic clathrate hydrate composed of tri-n-butylbenzyl-phosphonium chloride has been investigated from the viewpoint of phase equilibrium (temperature-composition) relations in comparison with an ionic clathrate hydrate with tri-n-butyl(cyclohexylmethyl)phosphonium bromide. The highest dissociation temperature of the ionic clathrate hydrates composed of tri-n-butylbenzylphosphonium chloride and tri-n-butyl(cyclohexyl-methyl)phosphonium bromide were 274.4 ± 0.1 K and 276.0 ± 0.1 K, respectively at the atmospheric pressure. The dissociation enthalpy of tri-n-butylbenzyl-phosphonium chloride ionic clathrate hydrate was 192 ± 3 kJ·kg−1. These results allow us to suggest that controlling steric structures in the guest compounds might be one of the options for tuning the equilibrium temperatures of ionic clathrate hydrates.
    The Electrochemical Society, Sep. 2024, ECS Transactions, 114(6) (6), 75 - 79
    Scientific journal

  • Nobuyuki Tamai, Shusuke Isogai, Yuka Yokoyama, Atsushi Tani
    May 2024, Radiation Physics and Chemistry
    Scientific journal

  • Jin Shimada, Takeshi Sugahara, Atsushi Tani, Takahiro Ueda, Riko Tsugaya, Katsuhiko Tsunashima, Takayuki Hirai
    American Chemical Society (ACS), Mar. 2024, Energy & Fuels, 38(7) (7), 6471 - 6477
    Scientific journal

  • Khalif Benzid, Atsushi Tani
    Elsevier BV, Jan. 2024, Journal of Luminescence, 265, 120218 - 120218
    Scientific journal

  • Shin Toyoda, Kazuhiko Inoue, Ichiro Yamaguchi, Masaharu Hoshi, Seiko Hirota, Toshitaka Oka, Tatsuya Shimazaki, Hideyuki Mizuno, Atsushi Tani, Hiroshi Yasuda, Chryzel A B Gonzales, Kenichi Okutsu, Atsushi Takahashi, Nao Tanaka, Azumi Todaka
    Abstract A total of seven Japanese laboratories participated in an intercomparison study to estimate the dose given to tooth enamel samples, using the electron spin resonance method. Each of four of the participating laboratories prepared a set of tooth enamel samples, using the electron spin resonance method. Four of the participating laboratories each prepared a set of tooth enamel samples, consisting of seven standard aliquots irradiated from 100 to 2000 mGy and three samples with an ‘unknown’ dose between 140 and 960 mGy, were intended to eliminate bias from sample preparation. Although not all seven laboratories measured all four sets of samples, the major finding was that systematic biases in estimating doses may be caused by differences in laboratory measurements rather than by the enamel extracting procedures. When doses were averaged by measurements made by multiple laboratories, the averaged values were close to the actual values. Scattering in the intercepts in the standard dose response would be a serious problem in actual dosimetry where no background sample is available.
    Oxford University Press (OUP), Sep. 2023, Radiation Protection Dosimetry, 199(14) (14), 1557 - 1564
    Scientific journal

  • Ryo Kobayashi, Hibiki Kojima, Atsushi Tani
    Abstract A submarine dune on the seabed in the Okinose area of Osaka Bay, Japan, was found to be composed mainly of coarse quartz sand. To investigate the provenance of this sand, quartz extracted from granite and granodiorite sources near Osaka Bay was measured by electron spin resonance; E1′, Ti-Li and Al centres were detected in all samples. Although the heat-treated E1′ centre was found not to be useful for the present provenance study, the ratio of the signal intensities of the Ti-Li centre to the Al centre classified the potential sources into two groups, based on their likelihood. The results indicated that granite and granodiorite from Awaji Island as well as Rokko granite could be the source of the Okinose sand.
    Oxford University Press (OUP), Sep. 2023, Radiation Protection Dosimetry, 199(14) (14), 1639 - 1645
    Scientific journal

  • Yuka Yokoyama, Shusuke Isogai, Kenta Kusuki, Atsushi Tani, Hirotsugu Nishido
    Abstract Chibaite, a silica-framework structure with cage-like voids occupied by gaseous molecules, was found in marine sediments. Its formation age could be evaluated using electron spin resonance (ESR) if the radicals formed by natural radiation can be assumed to accumulate over time. To investigate whether hydrogen transfer reactions, where organic radicals withdraw hydrogen atoms from other molecules in adjacent cages, occur in chibaite and affect ESR dating, gamma-irradiated chibaite was measured by ESR. Methyl, ethyl, n-propyl, isopropyl, tert-butyl radicals and hydrogen atoms were created by gamma irradiation at 77 K. The amount of tert-butyl radicals increased around 240 K and the similar amount of the other organic radicals decreased simultaneously, implying that hydrogen transfer reactions occur between isobutane and the organic radicals in chibaite around 240 K and therefore would have no influence on ESR dating because the reactions are completed at the environmental temperature.
    Oxford University Press (OUP), Sep. 2023, Radiation Protection Dosimetry, 199(14) (14), 1646 - 1652
    Scientific journal

  • Jin Shimada, Atsushi Tani, Takeshi Yamada, Takeshi Sugahara, Takayuki Hirai, Takuo Okuchi
    The dynamics of the water molecules in tetra-n-butyl-d36-ammonium bromide semiclathrate hydrate was investigated by quasi-elastic neutron scattering (QENS). The QENS results clearly revealed a fast reorientation motion of water molecules in the temperature range of 212–278 K. The mean jump distance of hydrogen atoms was within 1.5–2.0 Å. The relaxation time of water reorientation was estimated to be 100–410 ps with an activation energy of 10.2 ± 5.8 kJ·mol−1. The activation energy was in good agreement with the cleavage energy of hydrogen bonds. Such a short relaxation time of water reorientation is possibly due to strong interaction between a bromide anion and its surrounding water molecules (similar to so-called negative hydration), which suggests a unique strategy for designing efficient, safe, and inexpensive proton conductors having the framework of semiclathrate hydrates.
    AIP Publishing, Jul. 2023, Applied Physics Letters, 123(4) (4)
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Jin Shimada, Yuta Takaoka, Takahiro Ueda, Atsushi Tani, Takeshi Sugahara, Katsuhiko Tsunashima, Hirohisa Yamada, Takayuki Hirai
    Elsevier BV, May 2023, Solid State Ionics, 393, 116188 - 116188
    Scientific journal

  • Yoko Kebukawa, Shinya Asano, Atsushi Tani, Isao Yoda, Kensei Kobayashi
    Dec. 2022, ACS Central Science
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Yasuhiro Miwa, Tomoki Nagahama, Harumi Sato, Atsushi Tani, Kei Takeya
    Semi-clathrate hydrates are attractive heat storage materials because the equilibrium temperatures, located above 0 °C in most cases, can be changed by selecting guest cations and anions. The equilibrium temperatures are influenced by the size and hydrophilicity of guest ions, hydration number, crystal structure, and so on. This indicates that intermolecular and/or interionic interaction in the semi-clathrate hydrates may be related to the variation of the equilibrium temperatures. Therefore, intermolecular and/or interionic interaction in semi-clathrate hydrates with quaternary onium salts was directly observed using low-frequency Raman spectroscopy, a type of terahertz spectroscopy. The results show that Raman peak positions were mostly correlated with the equilibrium temperatures: in the semi-clathrate hydrates with higher equilibrium temperatures, Raman peaks around 65 cm-1 appeared at a higher wavenumber and the other Raman peaks at around 200 cm-1 appeared at a lower wavenumber. Low-frequency Raman observation is a valuable tool with which to study the equilibrium temperatures in semi-clathrate hydrates.
    Jul. 2022, Molecules (Basel, Switzerland), 27(15) (15)
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Sakura Azuma, Jin Shimada, Katsuhiko Tsunashima, Takeshi Sugahara, Atsushi Tani, Takayuki Hirai
    American Chemical Society (ACS), Jun. 2022, Journal of Chemical & Engineering Data, 67(6) (6), 1415 - 1420
    Scientific journal

  • Tomomi Kawai, Tomoko Ohshima, Takeshi Tanaka, Satoshi Ikawa, Atsushi Tani, Naoya Inazumi, Ryoichi Shin, Yukie Itoh, Karen Meyer, Nobuko Maeda
    Periodontal disease develops as a result of oral microbiota in dysbiosis, followed by the growth of periodontal pathogens such as Porphyromonas gingivalis and Prevotella intermedia. In case of acute symptoms, antibacterial agents and disinfectants are administered, however the appearance of drug-resistant bacteria and allergies cause problems. In recent years, studies on the effects of probiotics have been conducted as an alternative therapy for periodontitis. However, the basic mechanism of the inhibitory effect of probiotic bacteria on periodontal disease has not been clearly elucidated. To clarify the antibacterial mechanism of probiotics against periodontal pathogens, we used Limosilactobacillus (Lactobacillus) fermentum ALAL020, which showed the strongest antibacterial activity against P. gingivalis and P. intermedia among 50 screened lactic acid bacteria strains. The antibacterial substances produced were identified and structurally analyzed. After neutralizing the MRS liquid culture supernatant of ALAL020 strain, the molecular weight (m/z) of the main antibacterial substance separated by gel filtration column chromatography and reverse phase HPLC was 226.131. This low molecular weight compound was analyzed by LC-MS and disclosed the composition formula C11H18O3N2, however the molecular structure remained unknown. Then, structural analysis by NMR revealed C11H18O3N2 as the cyclic dipeptide, “hexahydro-7-hydroxy-3- (2-methylpropyl) pyrrolo [1,2-a] pyrazine-1,4-dion cyclo (Hyp-Leu) “. Based on the results of this analysis, cyclo (Hyp-Leu) was chemically synthesized and the antibacterial activity against P. gingivalis and P. intermedia was measured. The minimum inhibitory concentration (MIC) was 2.5 g/L and the minimum bactericidal concentration (MBC) was shown to be less than 5 g/L. In addition, an in vitro epithelial tissue irritation test at 10 g/L showed no tissue toxicity. So far there are no reports of this peptide being produced by probiotic bacteria. Furthermore, antibacterial activity of this cyclic dipeptide against periodontal disease bacteria has not been confirmed. The results of this study might lead to a comprehensive understanding of the antibacterial mechanism against periodontal disease bacteria in future, and are considered applicable for the prevention of periodontal disease.
    Frontiers Media SA, Mar. 2022, Frontiers in Cellular and Infection Microbiology, 12, 804334, English
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Jin Shimada, Moe Yamada, Atsushi Tani, Takeshi Sugahara, Katsuhiko Tsunashima, Yusuke Tsuchida, Takayuki Hirai
    Semiclathrate hydrate (SCH) is one of the phase change materials suitable for cold energy storage. Thermodynamic properties of SCHs, such as an equilibrium temperature and the dissociation enthalpy, depend on the size and shape of the guest substances. In the present study, to reveal the effects of steric conformations of the guest anions on the thermodynamic properties of SCHs, tetra-n-butylphosphonium dicarboxylate (TBP-DC) SCHs, where the anion was oxalate (TBP-Oxa), malonate (TBP-Mal), succinate (TBP-Suc), glutarate (TBP-Glu), maleate (TBP-Male), or fumarate (TBP-Fum), were investigated. TBP-Oxa, -Mal, -Suc, and -Fum SCHs had similar equilibrium temperatures, whereas the equilibrium temperatures of TBP-Glu and -Male SCHs were higher. This suggests that the size and conformation of glutarate and maleate anions are appropriate for the cage structures of SCHs. Moreover, we compared the equilibrium temperatures of TBP-Suc, -Male, and -Fum SCHs because TBP-Suc, -Male, and -Fum have similar anion structures. The equilibrium temperature of TBP-Suc SCH was similar to that of TBP-Fum SCH, whereas TBP-Male SCH showed a higher equilibrium temperature. This result implies that the succinate anion is accommodated in the trans conformation, similar to the fumarate anion, in the hydrate cages.
    American Chemical Society (ACS), Jan. 2022, Journal of Chemical & Engineering Data, 67(1) (1), 67 - 73, English
    [Refereed]
    Scientific journal

  • Jin Shimada, Masami Shimada, Takeshi Sugahara, Katsuhiko Tsunashima, Yuta Takaoka, Atsushi Tani
    Elsevier BV, Jun. 2021, Chemical Engineering Science, 236, 116514, English
    [Refereed]
    Scientific journal

  • Sumiko Tsukamoto, Taro Takeuchi, Atsushi Tani, Yosuke Miyairi, Yusuke Yokoyama
    {MDPI} {AG}, Jan. 2020, Methods and Protocols, 3(1) (1), 13 - 13
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • MIWA Yasuhiro, SHIMADA Jin, NAGAHAMA Tomoki, SATO Harumi, TANI Atsushi, TAKEYA Kei
    Tetrabutylammonium/phosphonium bromide (TBAB/TBPB) hydrates, ionic clathrate hydrates were investigated by low frequency Raman scattering including in Terahertz (THz) region. The peak position and full-width-half-maximum (FWHM) of each hydrate were compared in the region below 3 THz (100 cm-1) . The position of the peak considered to be the translational movement of the anion was about 65 cm-1 in TBAB, which was clearly higher than TBPB. This is considered to be due to difference of contribution to center cation in atomic charge distribution. In addition, FWHM is may be due to the crystal structure and reflects the interaction between the anion and the water molecule. Direct observation of intermolecular interactions using spectroscopy in the terahertz region can be used to assess the influence of guest molecule differences on material characteristics.
    The Japan Institute of Energy, Jul. 2019, Proceedings of the Annual Conference of The Japan Institute of Energy, 28, 58 - 59, Japanese

  • Shunichi Kamata, Francis Nimmo, Yasuhito Sekine, Kiyoshi Kuramoto, Naoki Noguchi, Jun Kimura, Atsushi Tani
    Springer Science and Business Media {LLC}, Jun. 2019, Nature Geoscience, 12(6) (6), 407 - 410
    [Refereed]
    Scientific journal

  • MURANAKA YASUKO, MAIYA KIYOSHI, TANI ATSUSHI, ITOH MASAYUKI, EBINA KUNIYOSHI
    2017 年度より神戸大学は、兵庫県立大学、関西学院大学、甲南大学と ROOT と名付けたグローバルサイエンスキャンパス事業に取り組んでいる。そのプログラムでは強い知的好奇心と探究心を備えた高校生に根源的な問を喚起するユニットをはじめとする「科学力養成プログラム」と科学英語を学ばせる「国際性導入プログラム」を基礎ステージで高校生に提供し、その中から選抜された高校生に実践ステージで大学教員が研究指導を行い、ワ
    シントン大学でポスター発表させる。2017 年度 ROOT プログラムに参加した 45 名の高校生を対象にインタビュー、ルーブリック評価、レジリエンス尺度、質問紙調査を用いて到達度、満足度などを調べた。その結果、基礎ステージで大半の受講生が満足できる水準に到達していること、実践ステージで 3 つのカテゴリーで有意な上昇をしていることが確かめられた
    神戸大学大学教育推進機構, Mar. 2019, 大学教育研究, (27) (27), 139 - 158, Japanese
    [Refereed]
    Research institution
    Link to Kobe Univ. Repository (Kernel)

  • Kudo Kushi, Tani Atsushi, Nagasawa Makoto, Yamada Keita, Yoshida Naohiro
    氷衛星・氷惑星から噴出するプルームには、H2やCO2、CH4等の微量ガスが含まれる事が明らかにされてきたことから、微生物による生命活動の可能性が注目されている。しかし、岩石での地質化学的な微量ガスの生成の寄与が不明瞭であることから、微量ガスを検知するだけでは、微生物による生命活動を断定しきれない。この現状を踏まえ、本研究は、氷衛星・氷惑星の環境を模した室内実験から、主にCH4の同位体分別の素過程を評価し、生物起源のガスの寄与の定量的な推定を行うことを目的とする。本研究では、氷地殻–内部海に存在し、プルーム放出までの過程に影響を及ぼすクラスレートハイドレートに着目する。実験では、エンケラドス、および、エウロパの条件における同位体分別を調べる。実験に際し、50 MPa まで圧力を保持できるバッジ式特殊環境ハイドレート生成装置の開発を行った。本発表では、装置、および、測定法の詳細についての議論を中心に行う。
    GEOCHEMICAL SOCIETY OF JAPAN, 2019, Abstracts of Annual Meeting of the Geochemical Society of Japan, 66, 163, Japanese

  • SHIMADA Jin, SHIMADA Masami, SUGAHARA Takeshi, TSUNASHIMA Katsuhiko, TANI Atsushi, TSUCHIDA Yusuke, MATSUMIYA Masahiko
    Phase equilibrium (temperature-composition) relations of tetra-n-butylphosphonium formate (TBP-For), acetate (TBP-Ace), and lactate (TBP-Lac) semiclathrate hydrate systems have been measured. The highest equilibrium temperatures of TBP-For, TBP-Ace, and TBP-Lac semiclathrate hydrates were 280.9, 284.6, and 283.8 K at the atmospheric pressure, respectively, where the composition of tetra-n-butylphosphonium carboxylate was approximately 0.035 ± 0.001 (mole fraction) in every system. The dissociation enthalpies of tetra-n-butylphosphonium carboxylate semiclathrate hydrates were measured by differential scanning calorimetry. The dissociation enthalpies of TBP-For, TBP-Ace, and TBP-Lac semiclathrate hydrates were (187 ± 3), (193 ± 3), and (177 ± 3) J·g-1, respectively.
    Aug. 2018, Journal of Chemical Engineering Data, 63(9) (9), 3615 - 3620, English
    [Refereed]
    Scientific journal

  • Akira Ijiri, Fumio Inagaki, Yusuke Kubo, Rishi R Adhikari, Shohei Hattori, Tatsuhiko Hoshino, Hiroyuki Imachi, Shinsuke Kawagucci, Yuki Morono, Yoko Ohtomo, Shuhei Ono, Sanae Sakai, Ken Takai, Tomohiro Toki, David T Wang, Marcos Y Yoshinaga, Gail L Arnold, Juichiro Ashi, David H Case, Tomas Feseker, Kai-Uwe Hinrichs, Yojiro Ikegawa, Minoru Ikehara, Jens Kallmeyer, Hidenori Kumagai, Mark A Lever, Sumito Morita, Ko-Ichi Nakamura, Yuki Nakamura, Manabu Nishizawa, Victoria J Orphan, Hans Røy, Frauke Schmidt, Atsushi Tani, Wataru Tanikawa, Takeshi Terada, Hitoshi Tomaru, Takeshi Tsuji, Urumu Tsunogai, Yasuhiko T Yamaguchi, Naohiro Yoshida
    Microbial life inhabiting subseafloor sediments plays an important role in Earth's carbon cycle. However, the impact of geodynamic processes on the distributions and carbon-cycling activities of subseafloor life remains poorly constrained. We explore a submarine mud volcano of the Nankai accretionary complex by drilling down to 200 m below the summit. Stable isotopic compositions of water and carbon compounds, including clumped methane isotopologues, suggest that ~90% of methane is microbially produced at 16° to 30°C and 300 to 900 m below seafloor, corresponding to the basin bottom, where fluids in the accretionary prism are supplied via megasplay faults. Radiotracer experiments showed that relatively small microbial populations in deep mud volcano sediments (102 to 103 cells cm-3) include highly active hydrogenotrophic methanogens and acetogens. Our findings indicate that subduction-associated fluid migration has stimulated microbial activity in the mud reservoir and that mud volcanoes may contribute more substantially to the methane budget than previously estimated.
    Jun. 2018, Science advances, 4(6) (6), eaao4631, English, International magazine
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Peroxynitric acid (HOONO2) is the active component in cryo-preserved plasma- treated water with the reduced-pH method for effective and safety disinfection
    KITANO Katsuhisa, IKAWA Satoshi, NAKASHIMA Yoichi, KAWASHITA Norihito, TANI Atsushi
    Aug. 2017, Proceedings of the 23rd International Symposium on Plasma Chemistry, English
    International conference proceedings

  • An electron spin resonance (ESR) study on effects of γ-ray irradiation on basalt fiber
    SAKANOUE Masafumi, TANI Atsushi, FUKAZAWA Hiroshi
    Mar. 2017, Advances in ESR Applications, 33, 4 - 8, Japanese
    [Refereed]
    Scientific journal

  • NISHITANI Ryusuke, TANI Atsushi, SASAKI Sho

    Although it is known that ammonium ion is replaced with a part of water cages of clathrate hydrate, it isn't known how much amount of ammonium ions are included into clathrate hydrate with the formation. We investigated how much amount of ammonium ions were included into clathrate hydrate with its formation. Tetrahydrofuran (THF) hydrate, as an analogue for CH4 and CO2 hydrate, was formed in a solution of THF with ammonium chloride. The concentration of ammonium ion in THF hydrate (CS) was determined and compared with the initial concentration of ammonium ion (C0). The ratio of CS to C0 (K=CS/C0) was determined when the volume ratio of formed solid to liquid was less than 0.9. The K value was 0.28 approximately when C0 wasn't more than 10 mmol/L. This value was about three times more than that value when ice was formed in an ammonium ion solution.

    The Japan Institute of Energy, 2017, Proceedings of the Annual Conference of The Japan Institute of Energy, 26, 54 - 55, Japanese

  • Satoshi Ikawa, Atsushi Tani, Yoichi Nakashima, Katsuhisa Kitano
    Plasma-treated water (PTW), i.e. distilled water (DW) exposed to low-temperature atmospheric pressure helium plasma, exhibited strong bactericidal activity against Escherichia coli in suspension even within a few minutes of preparation. This effect was enhanced under acidic conditions. The bactericidal activity of PTW was attenuated according to first-order kinetics and the half-life was highly temperature dependent. The electron spin resonance (ESR) signal of an adduct of the superoxide anion radical (O-2(-center dot)) was detected in an aqueous solution using a spin-trapping reagent mixed with PTW, and adding superoxide dismutase to the PTW resulted in a loss of the bactericidal activity and weakening of the ESR adduct signal of O-2(-center dot) in the spin-trapping. These results suggest that O-2(-center dot) plays an important role in imparting bactericidal activity to PTW. Moreover, molecular nitrogen was required both in the ambient gas and in the DW used to prepare the PTW. We, therefore, suggest that the reactive molecule in PTW with bactericidal effects is not a free reactive oxygen species but nitrogen atom(s)containing molecules that release O-2(-center dot), such as peroxynitrous acid (ONOOH) or peroxynitric acid (O2NOOH). Considering the activation energy for degradation of these species, we conclude that peroxynitric acid stored in PTW induces the bactericidal effect.
    IOP PUBLISHING LTD, Oct. 2016, JOURNAL OF PHYSICS D-APPLIED PHYSICS, 49(42) (42), 425401, English
    [Refereed]
    Scientific journal

  • Katsunori Yanagawa, Atsushi Tani, Naoya Yamamoto, Akihiro Hachikubo, Akihiro Kano, Ryo Matsumoto, Yohey Suzuki
    The biological flux and lifetime of methanol in anoxic marine sediments are largely unknown. We herein reported, for the first time, quantitative methanol removal rates in subsurface sediments. Anaerobic incubation experiments with radiotracers showed high rates of microbial methanol consumption. Notably, methanol oxidation to CO2 surpassed methanol assimilation and methanogenesis from CO2/H-2 and methanol. Nevertheless, a significant decrease in methanol was not observed after the incubation, and this was attributed to the microbial production of methanol in parallel with its consumption. These results suggest that microbial reactions play an important role in the sources and sinks of methanol in subseafloor sediments.
    JAPANESE SOC MICROBIAL ECOLOGY, DEPT BIORESOURCE SCIENCE, Jun. 2016, MICROBES AND ENVIRONMENTS, 31(2) (2), 190 - 193, English
    [Refereed]
    Scientific journal
    Link to Kobe Univ. Repository (Kernel)

  • Yoichi Nakashima, Satoshi Ikawa, Atsushi Tani, Katsuhisa Kitano
    Ion-exchange chromatographic analysis of peroxynitric acid (O2NOOH) was performed by combining an acidic eluate with an UV-vis detector and immersing the separation column in an ice-water bath. The decomposition behavior of peroxynitric acid in the solution was also studied using this system. The fraction for the peroxynitric acid peak was collected. Ion-exchange chromatographic analysis of this fraction, after standing at room temperature for 24h, showed that the decomposition products were mainly nitrate ions with a very small amount of nitrous acid. The peroxynitric acid peak area correlated perfectly with the total amount of decomposition products. The ion-exchange chromatographic isolation allowed us to evaluate the molar extinction coefficient of peroxynitric acid precisely in a wider wavelength range than previous reports. The value decreases monotonically from 1729 +/- 26 M-1 cm(-1) at 200 nm to 12.0 +/- 0.5 M-1 cm(-1) at 290 nm. (C) 2015 Elsevier B.V. All rights reserved.
    Elsevier {BV}, Jan. 2016, Journal of Chromatography A, 1431, 89 - 93, English
    [Refereed]
    Scientific journal

  • Atsushi Tani, Satoshi Fukui, Satoshi Ikawa, Katsuhisa Kitano
    We investigated fatty acid oxidation by atmospheric-pressure nonthermal helium plasma using linoleic acid, an unsaturated fatty acid, together with evaluating active species induced in liquids. If the ambient gas contains oxygen, direct plasma such as plasma jets coming into contact with the liquid surface supplies various active species, such as singlet oxygen, ozone, and superoxide anion radicals, to the liquid. The direct plasma easily oxidizes linoleic acid, indicating that fatty acid oxidation will occur in the direct plasma. In contrast, afterglow flow, where the plasma is terminated in a glass tube and does not touch the surface of the liquid sample, supplies mainly superoxide anion radicals. The fact that there was no clear observation of linoleic acid oxidation using the afterglow reveals that it may not affect lipids, even in an atmosphere containing oxygen. The afterglow flow can potentially be used for the sterilization of aqueous solutions using the reduced pH method, in medical and dental applications, because it provides bactericidal activity in the aqueous solution despite containing a smaller amount of active species.
    IOP PUBLISHING LTD, Oct. 2015, JOURNAL OF PHYSICS D-APPLIED PHYSICS, 48(42) (42), 424010, English
    [Refereed]
    Scientific journal

  • Sumiko Tsukamoto, Shin Toyoda, Atsushi Tani, Frank Oppermann
    Equivalent dose (D-e) estimations in electron spin resonance (ESR) dating have mostly been done by the multiple aliquot additive dose (MAAD) method despite disadvantages. In this study, we used X-ray irradiations and applied the single aliquot regenerative dose (SAR) technique to ESR De measurements of a volcanic quartz with independent age control. As the SAR protocol involves multiple steps of irradiations and readouts during a short period of time using a single aliquot, the thermal stabilities of the Al and Ti centres from natural and X-ray irradiated aliquots were compared by a pulse annealing test. The thermal stability of natural and regenerated ESR signals is significantly different for both Al and Ti centres and preheats are therefore considered necessary after artificial irradiations. The X-ray dose rate for quartz was calibrated using the same sample which was heated and irradiated with a known gamma dose. The SAR D-e values using the natural sample were obtained by means of a preheat plateau test. To check and correct for possible sensitivity change induced by the annealing used to reset the natural ESR signals, the single aliquot regeneration and added dose (SARA) method was applied. The SARA D-e values for the Al and Ti centres were in agreement, however, this D-e value overestimated the expected D-e from the independent age control, possibly because our sample was too old for the SARA method. (C) 2015 Elsevier Ltd. All rights reserved.
    PERGAMON-ELSEVIER SCIENCE LTD, Oct. 2015, RADIATION MEASUREMENTS, 81, 9 - 15, English
    [Refereed]
    Scientific journal

  • Kensaku Kakimoto, Haruna Nagayoshi, Naoya Inazumi, Atsushi Tani, Yoshimasa Konishi, Keiji Kajimura, Takeshi Ohura, Takeshi Nakano, Ning Tang, Kazuichi Hayakawa, Akira Toriba
    Polycyclic aromatic hydrocarbons (PAHs) and chlorinated PAHs (C1PAHs) are ubiquitous contaminants that bind to the aryl hydrocarbon receptor (AhR) and exhibit mutagenic potential. It is difficult to monitor human exposure levels to C1PAHs because the exposure routes are complicated, and environmental concentrations are not always correlated with the levels of PAHs. Urinary PAR metabolites are useful biomarkers for evaluating PAR exposure, and C1PAH metabolites may therefore contribute to the estimation of C1PAH exposure. One of the most abundant C1PAHs present in the environment is 1-chloropyrene (CIPyr), and urinary CIPyr metabolites have the potential to be good biomarkers to evaluate the level of exposure to C1PAHs. Since the metabolic pathways involving C1PAHs are still undetermined, we investigated the effect of human cytochrome P450 enzymes on CIPyr and identified three oxidative metabolites by liquid chromatography tandem mass spectrometry and nuclear magnetic resonance. We found that CIPyr was metabolized most efficiently by the P450 1A1 enzyme, followed by the 1B1 and 1A2 enzymes. Similar to CIPyr, these metabolites were shown to have agonist activity for the human AhR. We detected these metabolites when ClPyr reacted with a pooled human liver S9 fraction as well as in human urine samples. These results suggest that the metabolites may be used as biomarkers to evaluate the extent of exposure to C1PAHs.
    AMER CHEMICAL SOC, Sep. 2015, CHEMICAL RESEARCH IN TOXICOLOGY, 28(9) (9), 1728 - 1736, English
    [Refereed]
    Scientific journal

  • Atsushi Tani, Satoshi Fukui, Satoshi Ikawa, Katsuhisa Kitano
    To confirm the formation of the superoxide anion radical (O-2(-)center dot) in liquids by atmospheric-pressure plasma, we investigated plasma-induced radical species in water using the electron spin resonance (ESR) spin-trapping technique combined with two proteins: superoxide dismutase (SOD), which has enzymatic activity to quench the superoxide anion radical, and bovine serum albumin (BSA), which does not have this enzymatic activity. Different setups of contact and non-contact atmospheric-pressure helium plasma were tested with an additional supply of oxygen gas. For each setup of plasma, no superoxide anion adduct ESR signal was observed in the aqueous solution with SOD, whereas the ESR signal appears in the samples with BSA and without any additive proteins. This means that a superoxide anion radical in the solution is sufficiently quenched by SOD before the formation of the spin adduct. The superoxide anion radical is actually induced in an aqueous solution by atmospheric-pressure plasma when ambient gases contain oxygen. (C) 2015 The Japan Society of Applied Physics
    IOP PUBLISHING LTD, Jan. 2015, JAPANESE JOURNAL OF APPLIED PHYSICS, 54(1) (1), 01AF01, English
    [Refereed]
    Scientific journal

  • Atsushi Tani, Motoi Oshima
    Recent progress in observations of radiation-induced radicals in gas hydrates was reviewed. Two different types of intermolecular hydrogen transfer reactions were observed. One is hydrogen-picking reaction where alkyl radicals withdraw hydrogen of alkane guest molecules in the adjacent cages of alkane hydrates. The other is hydrogen-hopping reaction where carboxyl (HOCO) radicals transfer excess hydrogen to CO2 molecules in the adjacent cages of CO2 hydrate. In the CO2 + methane mixed gas hydrates, the yield of radiation-induced radicals increases by reducing the inverse reactions of radical formation. The variety of intermolecular reactions in gas hydrates will attract us not only in physical chemistry but also in application area using new reaction field.
    Japan Society of High Pressure Science and Technology, Dec. 2014, Review of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu, 24(4) (4), 258 - 264, Japanese
    [Refereed]
    Scientific journal

  • Motoi Oshima, Kazuma Kitamura, Atsushi Tani, Takeshi Sugahara, Kazunari Ohgaki
    The formation mechanisms of gamma-ray-induced carboxyl (HOCO) and methyl radicals in CO2 + methane mixed gas hydrates, which are inclusion compounds of H2O, CO2, and methane, were investigated. The HOCO and methyl radicals were observed in CO2 + methane mixed gas hydrates by electron spin resonance (ESR) at 120 K after irradiation at 77 K. The amounts of the HOCO and methyl radicals induced in the mixed hydrates are much higher than those in pure CO2 and methane hydrates. Both radicals are synergistically formed in the mixed hydrates by efficient reactions between the guest molecules (CO2 and methane) and the active species (electron, proton, and hydroxyl radical) induced from H2O.
    AMER CHEMICAL SOC, Nov. 2014, JOURNAL OF PHYSICAL CHEMISTRY B, 118(47) (47), 13435 - 13439, English
    [Refereed]
    Scientific journal

  • Atsushi Tani, Satoshi Koyama, Yusuke Urabe, Kenji Takato, Takeshi Sugahara, Kazunari Ohgaki
    Clathrate hydrates preserve active species more stably than the other icy materials and investigation of the behavior of the active species elucidates the physicochemical properties of clathrate hydrates like guestguest interaction. Color of the tert-butylamine clathrate hydrate changes to blue after gamma irradiation and is bleachable with visible light. The electron spin resonance (ESR) spectrum at 120 K mainly consists of a triplet signal of the C-centered radical NH2C(CH3)(2)CH2 center dot together with a single signal at g = 2.0008. The latter signal disappears after light exposure. These results indicate that both the blue color and the single ESR signal are derived from trapped electrons in the hydrate. They thermally decay around 140160 K by the first-order reaction, and the activation energy is 27 kJ/mol. Since tert-butylamine molecules can capture protons due to the high proton affinity, electrons may remain in the hydrate without reacting with protons, making the hydrate blue after gamma irradiation. The long-lived trapped electrons in the tert-butylamine hydrate have an advantage to investigate those in icy materials because tert-butylamine hydrate is nonionic and has a tetra-coordinated host water network like crystalline ice without any substitution for water molecules.
    AMER CHEMICAL SOC, Nov. 2014, JOURNAL OF PHYSICAL CHEMISTRY B, 118(47) (47), 13409 - 13413, English
    [Refereed]
    Scientific journal

  • Oshima, M., Tani, A., Sugahara, T., Kitano, K., Ohgaki, K.
    The carboxyl (HOCO) radical, which is an important species in atmospheric chemistry and combustion, is an intermediate in the reaction: CO + OH -> CO2 + H and serves as a hydrogen donor to the reaction partners. The cis-HOCO radical, one of the ground-state HOCO radicals, is supposed to be decomposed into CO2 and the hydrogen atom by a tunneling effect. In order to prove the hypothesis, we performed electron spin resonance (ESR) measurements to investigate the decay mechanisms of the ground-state HOCO and DOCO radicals in gamma-ray-irradiated CO2 hydrates, which may hold the radicals stably. The ground-state HOCO and DOCO radicals decayed according to a second-order decay model and transformed into formic acid and CO2. The ratio of the decay rate constants of HOCO and DOCO radicals shows a good agreement with that in the kinetic isotope effect for the hydrogen and deuterium abstraction reactions. These results indicate that they react with another HOCO radical in the adjacent hydrate cage without the tunneling effect. This implies that the ground-state HOCO radicals are not decomposed by the tunneling effect but are decayed through reactions with some atoms, molecules, and/or radicals even in the gas phase. In addition, the hydrogen-atom hopping through the temporary hydrogen bonds between the HOCO radical and CO2 results in a seeming diffusion of the HOCO radicals in the CO2 hydrate; this would be an important concept for the studies of the radical diffusions and the supply of hydrogen atoms in gas, liquid, and solid phases.
    ROYAL SOC CHEMISTRY, 2014, Physical Chemistry Chemical Physics, 16(8) (8), 3792 - 3797, English
    [Refereed]
    Scientific journal

  • Oshima Motoi, Tani Atsushi, Sugahara Takeshi, Kitano Katsuhisa, Ohgaki Kazunari
    The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, 2012, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2012(0) (0), 10 - 10, Japanese
    [Refereed]

  • Sugahara, T., Kobayashi, Y., Tani, A., Inoue, T., Ohgaki, K.
    To investigate the molecular interaction between guest species inside of the small and large cages of methane + propane mixed gas hydrates, thermal stabilities of the methyl radical (possibly induced in small cages) and the normal propyl and isopropyl radicals (induced in large cages) were investigated by means of electron spin resonance measurements. The increase of the total amount of the normal propyl and isopropyl radicals reveals that the methyl radical in the small cage withdraws one hydrogen atom from the propane molecule enclathrated in the adjacent large cage of the structure-H hydrate. A guest species in a hydrate cage has the ability to interact closely with the other one in the adjacent cages. The clathrate hydrate may be utilized as a possible nanoscale reaction field.
    AMER CHEMICAL SOC, 2012, Journal of Physical Chemistry A, 116(10) (10), 2405 - 2408, English
    [Refereed]
    Scientific journal

  • Kobayashi, H., Asaji, T., Tani, A.
    The molecular orientation and dynamics of the organic stable radicals such as 2,2,6,6-tetramethyl-1-piperidinyl-1-oxyl (TEMPO) or 4-hydroxy-TEMPO (TEMPOL) included in the one-dimensional (1-D) organic nanochannels of 2,4,6-tris-4-(chlorophenoxy)-1,3,5-triazine (CLPOT) were investigated by examining the inclusion compounds (ICs) diluted by the co-inclusion of non-radicals using ESR spectroscopy. Spectral simulation showed that the axial rotation of TEMPO or TEMPOL molecules is excited in the nanochannels with activation energies of 8 and 7?kJ?mol-1, respectively. The rotation axis was estimated to be tilted towards the principal x direction in the axis system of the g-tensor of the respective radicals. This is quite different from that for similar ICs in the nanochannels of tris(o-phenylenedioxy)cyclotriphosphazene (TPP), in which the radicals are axially rotating around the principal axis y of the g-tensor. The difference is attributed to the larger nanospace of the CLPOT nanochannels. Copyright (C) 2012 John Wiley & Sons, Ltd.
    WILEY-BLACKWELL, 2012, Magnetic Resonance in Chemistry, 50(3) (3), 221 - 228, English
    [Refereed]
    Scientific journal

  • Kobayashi, N., Minami, T., Tani, A., Nakagoshi, M., Sugahara, T., Takeya, K., Ohgaki, K.
    Electron spin resonance (ESR) spectra of butyl radicals induced with gamma-ray irradiation in the simple isobutane (2-methylpropane) hydrate (prepared with deuterated water) were investigated. Isothermal annealing results of the gamma-ray-irradiated isobutane hydrate reveal that the isobutyl radical in a large cage withdraws a hydrogen atom from the isobutane molecule through shared hexagonal-faces of adjacent large cages. During this "hydrogen picking" process, the isobutyl radical is apparently transformed into a tert-butyl radical, while the sum of isobutyl and tert-butyl radicals remains constant. The apparent transformation from isobutyl to tert-butyl radicals is an irreversible first-order reaction and the activation energy was estimated to be 35 +/- 3 kJ/mol, which was in agreement with the activation energy (39 +/- 5 kJ/mol) of hydrogen picking in the gamma-ray-irradiated propane hydrate with deuterated water.
    MDPI AG, 2012, Energies, 5(6) (6), 1705 - 1712, English
    [Refereed]
    Scientific journal

  • Tani, A., Ono, Y., Fukui, S., Ikawa, S., Kitano, K.
    To understand plasma-induced chemical processing in liquids, we investigated the formation of free radicals in aqueous solution exposed to different types of non-contact atmospheric-pressure helium plasma using the spin-trapping technique. Both hydroxyl radical (OH center dot) and superoxide anion radical (O-2(-)center dot) adducts were observed when neutral oxygen gas was additionally supplied to the plasma. In particular, O-2(-)center dot can be dominantly induced in the solution via oxygen flow into the afterglow gas of helium plasma. This type of plasma treatment can potentially be used in medical applications to control infectious diseases, because the O-2(-)center dot is crucial for sterilization of liquids via atmospheric-pressure plasma. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4729889]
    AMER INST PHYSICS, 2012, Applied Physics Letters, 100(25) (25), 254103, English
    [Refereed]
    Scientific journal

  • Tani, A., Hasegawa, N., Norizawa, K., Yada, T., Ikeya, M.
    Radiation-induced free radicals in hydrated magnesium sulfate, which are thought to be present on the surface of Europa, one of the Jovian moons, have been studied by electron spin resonance (ESR). ESR signals of both atomic hydrogen (H center dot) at g = 2.0023 and sulfite radical (SO3-center dot) at g = 2.0029 are observed in epsomite (MgSO4 center dot 7H(2)O) and in quenched samples of magnesium sulfate solutions, after gamma-ray irradiation at 77 K. Atomic hydrogen disappears at temperatures above 90 K. The sulfite radical starts to decay above 190 K in the quenched sample of 10% magnesium sulfate solution, whereas in epsomite, it is stable even at 260 K. The sulfite radical accumulates at low ambient temperatures, and is a promising candidate for estimating the age of hydrated magnesium sulfate, especially in extraterrestrial environments. (C) 2012 Elsevier Ltd. All rights reserved.
    PERGAMON-ELSEVIER SCIENCE LTD, 2012, Radiation Measurements, 47(9) (9), 890 - 893, English
    [Refereed]
    Scientific journal

  • In-situ Raman Observation on Aqueous Solution around Tetra-n-Butyl Ammonium Bromide Semi-Clathrate Hydrate
    Motoi Oshima, Shunsuke Hashimoto, Wataru Shimada, Atsushi Tani, Takeshi Sugahara, Kazunari Ohgaki
    To confirm the hydrate-like structures in tetra-n-butyl ammonium bromide (hereafter, TBAB) aqueous solution with tetragonal TBAB hydrates, the TBAB hydrate crystal and its stoichiometric aqueous solution at equilibrium state and during dissociation process have been investigated by means of in-situ Raman micro-spectroscopic observation. At equilibrium state and during dissociation process, the conformations of TBAB changed drastically around the surface between hydrate and aqueous phase, and the hydrate-like conformations did not appear in aqueous phase near the crystal. On the other hand, a broad signal in aqueous phase gradually changed during hydrate dissociation and then it converged after about 45 minutes. This implies the existence of residual that exhibits relatively slow structural relaxation in aqueous phase.
    Hokkaido University Press, Apr. 2011, Physics and Chemistry of Ice 2010, 2010, 141 - 146, English
    [Refereed]
    Scientific journal

  • In-situ ESR Observation of Free Radicals in Gas Hydrates under High Pressure
    Atsushi Tani, Kenji Takato, Takeshi Sugahara, Kazunari Ohgaki, Kei Takeya
    Methyl radical in gamma-irradiated methane hydrate with heavy water (D2O) has been investigated by electron spin resonance (ESR) using the sample tube designed for in-situ high-pressure measurements. Methyl radical, hydrogen atom, and deuterium atom were observed at 77 K. Hydroxyl radical (OH) was not detected and it is concordant with the previous results on gamma-irradiated methane hydrate with H2O. Although small signals of both hydrogen and deuterium atoms were found at 120 K, only methyl radicals remained at 210 K. The decay of the methyl radical was relatively slow under the pressurization with methane. The decay mechanism of the methyl radical partially depends on thermodynamic stability of methane hydrate.
    Hokkaido University Press, Apr. 2011, Physics and Chemistry of Ice 2010, 2010, 273 - 276, English
    [Refereed]
    Scientific journal

  • Nagashima, K., Tada, R., Tani, A., Sun, Y., Isozaki, Y., Toyoda, S., Hasegawa, H.
    It has been established that East Asian summer monsoon intensity varies with Dansgaard-Oeschger cycles, suggesting a connection between the climates of East Asia and the North Atlantic on a millennial timescale. However, the dynamics of such a connection are still unsolved. Here we demonstrate that temporal changes in the provenance of aeolian dust in Japan Sea sediments, which we interpret to reflect changes in the westerly jet path over East Asia, exhibit variations in harmony with Dansgaard-Oeschger cycles. The dominance of dust with a Mongolian Gobi provenance during stadials suggests a westerly jet axis located to the south of the Himalaya-Tibetan Plateau throughout most of the year, whereas the co-dominance of dust from both the Taklimakan Desert and the Mongolian Gobi during interstadials suggests that the westerly jet axis jumped to the north of the Tibetan Plateau at latest in summer. As the shift of the westerly jet axis to the north of the Tibetan Plateau is closely related to the onset of the East Asian summer monsoon, changes of the westerly jet path apparently critically affect the teleconnection between the climates of Asia and North Atlantic on a millennial timescale. (C) 2010 Elsevier Ltd. All rights reserved,
    PERGAMON-ELSEVIER SCIENCE LTD, 2011, Journal of Asian Earth Sciences, 40(6) (6), 1214 - 1220, English
    [Refereed]
    Scientific journal

  • Somekawa, T., Tani, A., Fujita, M.
    We demonstrated the first range-resolved detection and identification of CO2 dissolved in water by Raman lidar. A frequency doubled Q-switched neodymium-doped yttrium aluminum garnet (Nd:YAG) laser (532 nm) is used as the lidar light source, and the Raman signals at similar to 1273 and similar to 1380 cm(-1) from CO2 dissolved in water were detected. In lidar application, CO2 dissolved in water was identified in glass bottles 20 m away by using the CO2 Raman band at similar to 1380 cm(-1). (C) 2011 The Japan Society of Applied Physics
    JAPAN SOC APPLIED PHYSICS, 2011, Applied Physics Express, 4(11) (11), 112401, English
    [Refereed]
    Scientific journal

  • Motoi Oshima, Shunsuke Hashimoto, Atsushi Tani, Takeshi Sugahara, Kazunari Ohgaki, Wataru Shimada
    2010, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2010, 183, English
    [Refereed]
    Scientific journal

  • Jürschik, S., Tani, A., Sulzer, P., Haidacher, S., Jordan, A., Schottkowsky, R., Hartungen, E., Hanel, G., Seehauser, H., Märk, L., Märk, T.D.
    Here we present proof-of-principle investigations on a novel inlet system for proton-transfer-reaction mass spectrometry (PTR-MS) that allows for the analysis of trace compounds dissolved in water. The PTR-MS technique offers many advantages, such as real-time analysis, online quantification, no need for sample preparation, very low detection limits, etc.; however it requires gas phase samples and therefore liquid samples cannot be investigated directly. Attempts to measure trace compounds in water that have been made so far are mainly headspace analysis above the water surface and membrane inlet setups, which both are well suitable for certain applications, but also suffer from significant disadvantages. The direct aqueous injection(DAI) technique which we will discuss here turns out to be an ideal solution for the analysis of liquid samples with PTR-MS. We show that we can detect trace compounds in water over several orders of magnitude down to a concentration level of about 100 pptw, while only consuming about 100 mu l of the sample. The response time of the setup is about 20s and can therefore definitely be called "online". Moreover the method is applicable to the analysis of all substances and not limited by the permeability of a membrane. (C) 2009 Elsevier B.V. All rights reserved.
    ELSEVIER SCIENCE BV, 2010, International Journal of Mass Spectrometry, 289(2-3) (2-3), 173 - 176, English
    [Refereed]
    Scientific journal

  • Kobayashi, H., Asaji, T., Tani, A.
    A new inclusion compound (IC) using di-t-buthyl nitroxide (DBNO) radical and tris(o-phenylenedioxy)cyclotriphosphazene (TPP) (1), which has an organic one-dimensional (1-D) nanochannel in the crystal, is reported. According to the characterization using thermogravimetric analysis (TG), ESR measurements, etc., the composition of the inclusion compound was assigned as TPP:DBNO = 1:0.62. The narrowing of the isotropic ESR adsorption line of 1 was observed with a temperature increase from 103 K to room temperature. The line shape indicated a type of 1-D spin diffusion as observed in our previous study of the IC using TPP and 2,2,6,6-tetramethyl-1-piperidinyloxyl (TEMPO).
    MDPI AG, 2010, Materials, 3(6) (6), 3625 - 3641, English
    [Refereed]
    Scientific journal

  • Oshima, M., Shimada, W., Hashimoto, S., Tani, A., Ohgaki, K.
    Recrystallization in a tetragonal tetra-n-butyl ammonium bromide (hereafter, TBAB) semi-clathrate hydrate system has been investigated in TBAB aqueous solutions of two different concentrations (stoichiometric mole fraction for tetragonal TBAB hydrate formation and lower mole fraction than stoichiometric one) by use of optical microscopy. The recrystallization of TBAB hydrate has been observed under milder condition than that of the initial crystallization in both concentrations. In particular, solution of the lower concentration is easily recrystallized. This is the first observation of memory effect in a semi-clathrate hydrate system. In addition, the recrystallization occurs in the vicinity of the place where the last piece of initial crystal was dissociated. This implies that a small amount of residual structures remain in the dissociated water, but unfortunately they cannot be confirmed with Raman micro-spectroscopy. (C) 2010 Elsevier Ltd. All rights reserved.
    PERGAMON-ELSEVIER SCIENCE LTD, 2010, Chemical Engineering Science, 65(20) (20), 5442 - 5446, English
    [Refereed]
    Scientific journal

  • Y. Yamamoto, S. Toyoda, Y. Isozaki, Y. Sun, R. Tada, K. Nagasima, A. Tani
    Mar. 2009, Advances in ESR Applications, 25, 7 - 12, Japanese
    [Refereed]

  • 村山 達郎, 谷 篤史
    メタンハイドレート（MH）は、水分子が水素結合により籠を作り、内部に１分子のメタンを捕獲した構造をしており、深海底の堆積物中や永久凍土層などに存在している。MHの生成年代については、129Iを用いた方法などで行われている（Fehn et al., 2000）が、この方法はMHそのものを分析し、生成年代の決定を行っているわけではない。そこで、我々は海底のMHが堆積物中に存在し、堆積物に含まれる放射性同位体元素からの自然放射線を受ける環境にあることに着目し、化学反応によって生成するMH中の微量成分を分析することで生成年代決定を目指している。我々は放射線によってラジカル反応が起こり、メタノールが生成しているのではないかと考えた。本研究では生成年代決定を目指すための基礎実験として合成したMH用い、放射線照射によりメタノールがどのくらい生成するのかを検証した。
    日本地球化学会, 2009, 日本地球化学会年会要旨集, 56, 140 - 140, Japanese

  • Sakurai Toshimitsu, Iizuka Yoshinori, Tani Atsushi, Uchida Tsutomu, Hondoh Takeo
    The Japanese Society of Snow and Ice / Japan Society for Snow Engineering, 2009, Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2009, 82 - 82, Japanese

  • 山本 裕哉, 豊田 新, 磯崎 裕子, Sun Youbin, 多田 隆治, 長島 佳菜, 谷 篤史, 五十嵐 康人
    過去の気候変動を知るためにそれぞれの時代における大気循環システムの再現は重要な課題である。それを調べるため、過去の風送塵が研究されてきた。風送堆積物中の石英のE1'中心の信号強度によって示される酸素空孔量(Toyoda and Ikeya, 1991)の測定から、最終氷期と完新世とでその起源が異なることが報告された(成瀬他1997; Ono et al., 1998; Toyoda and Naruse 2002）。この後、石英中の酸素空孔量に加え、石英の結晶化度を指標として日本海堆積物の起源地の変動と気候変動との相関について議論された （Nagashima et al., 2007）。一方、石英中にはE1'中心のほかに不純物中心も観測される。今回、これまで用いられてきた指標に加えて不純物中心を用いる可能性について検討した。
    一般社団法人日本地球化学会, 2009, 日本地球化学会年会要旨集, 56(0) (0), 22 - 22, Japanese
    [Refereed]

  • Toyoda Shin, Yamamoto Yuya, Isozaki Yuko, Sun Youbin, Tada Ryuji, Nagashima Kana, Tani Atsushi, Igarashi Yasuhito
    The Geological Society of Japan, 2009, Annual Meeting of the Geological Society of Japan, 2009(0) (0), 561 - 561, Japanese

  • Kobayashi, H., Ueda, T., Miyakubo, K., Eguchi, T., Tani, A.
    Inclusion of 4-hydroxy-2,2,6,6-tetramethyl-1-piperidinyloxyl (TEMPOL) radical into an organic one-dimensional (1-D) nanochannels formed in guest-free tris(o-phenylenedioxy)cyclotriphosphazene (TPP) was attempted. The inclusion of TEMPOL molecules adsorbed into the TPP nanochannel and their molecular orientation and dynamics were confirmed by temperature-dependent election spin resonance (ESR) measurements. In the specimens prepared by co-precipitation, the existence of 1-D spin diffusion was suggested from the ESR line shape, but the diffusion was not as effective as in the case of the TPP and 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO) inclusion compound reported in our previous article. These results imply a new methodology for the preparation of a new organic magnet using TPP as a template.
    TAYLOR & FRANCIS LTD, 2009, Molecular Crystals and Liquid Crystals, 506(1) (1), 150 - 167, English
    [Refereed]
    Scientific journal

  • Y. Isozaki, R. Tada, Y. Sun, K. Nagashima, H. Zheng, S. Toyoda, A. Tani
    It is suggested that the uplift of Himalaya-Tibetan Plateau enhanced interior aridity in East Asia and resulted in development of middle latitude gobi and sandy deserts and accumulation of the eolian sediments in the Chinese Loess Plateau. Therefore, estimation of the provenance for eolian sediments in the Chinese Loess Plateau is critical to reconstruct the environmental changes in East Asia and their relation to the Himalaya-Tibetan Plateau uplift. We recently developed a new provenance tracing method by using a combination of Electron Spin Resonance (ESR) signal intensity and Crystallinity Index (CI) of quartz, and demonstrated that fine fraction of the surface sediments from nine major deserts in East Asia could be distinguished one another on the ESR signal intensity versus CI diagram. Here, we measured ESR signal intensity and CI of quartz in fine fractions of samples covering the last 7 Ma obtained from Lingtai section in the central Chinese Loess Plateau, and compared the results with those of the surface samples from nine major deserts in East Asia. The results suggest that the provenance of fine fraction of the eolian sediment in Lingtai section changed at 4.3, 2.1, 1.4, 1.1, 0.8 and 0.4 Ma. During 7 to 4.3 Ma, the dust might be have been supplied from Precambrian to Paleozoic metamorphic and granitic rocks and granite exposed in the present central to eastern part of the Tian Shan Mountains. The contribution from the Taklimakan desert appeared at 4.3 Ma, increased drastically at 1.1 Ma, and persisted till 0.8 Ma, whereas the main source of detrital material to the Taklimakan desert might have changed from eastern part of the Kunlun and the Altyn Mountains to western part of the Kunlun and the Tian Shan Mountains. During 0.8 to 0.4 Ma, contribution from the Badain Juran desert gradually increased. Finally, contribution from the Tengger desert appeared from 0.4 to 0 Ma. Together with tectonic evidences from literatures, the provenance changes from 4.3 to 0.8 Ma seem to reflect uplift of the Tian Shan and the Kunlun Mountains and consequent formation of the Taklimakan desert, whereas the change at 0.4 Ma may reflect uplift of the Qilian Mountains although formation of mountain glaciers could be an alternative possibility. These provenance changes will provide important constraints not only on the development of arid areas and evolution of monsoon but also on the uplift and erosion of mountains in East Asia.
    Mar. 2008, Climate of the Past Discussions, 4, 335 - 374, English
    [Refereed]

  • Sun, Y., Tada, R., Chen, J., Liu, Q., Toyoda, S., Tani, A., Ji, J., Isozaki, Y.
    2008, Geophysical Research Letters, 35(1) (1)
    [Refereed]
    Scientific journal

  • Kazunari Ohgaki, Kentaro Nakatsuji, Kei Takeya, Atsushi Tani, Takeshi Sugahara
    Electron spin resonance measurement of gamma-ray-irradiated propane hydrates shows that the normal propyl radical withdraws hydrogen from the adjacent propane molecule through the hexagonal planes of the hydrate cage without water molecule bridging.
    ROYAL SOC CHEMISTRY, 2008, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 10(1) (1), 80 - 82, English
    [Refereed]
    Scientific journal

  • Kobayashi, H., Ueda, T., Miyakubo, K., Eguchi, T., Tani, A.
    A mixture of 2,2,6,6-tetramethyl-1-piperidinyloxyl (TEMPO) radical and 2,2,6,6-tetramethyl-1-piperidine (TEMP) was included into organic 1-D nanochannels of tris(o-phenylenedioxy) cyclotriphosphazene (TPP) crystal. Dilution of the paramagnetic TEMPO radical was achieved with excess TEMP, thereby isolating a TEMPO molecule in the nanochannel. For inclusion compounds of TPP with TEMPO and TEMP (TEMPO/all guest compounds = 0.017 (1), and 0.15 (2)), temperature-dependent electron spin resonance (ESR) spectra were observed to investigate their molecular dynamics and orientation. In the temperature range from 112 K to room temperature, the spectra depended remarkably on the temperature. Temperature dependence was well interpreted by uniaxial rotation, suggesting that TEMPO molecules undergo uniaxial rotation about a channel axis with a molecular orientation in which the N-O bond in the nitroxide group is perpendicular to the channel axis. The activation energy of uniaxial rotation was evaluated as 4.5 +/- 0.3 kJ mol(-1).
    ROYAL SOC CHEMISTRY, 2008, Physical Chemistry Chemical Physics, 10(9) (9), 1263 - 1269, English
    [Refereed]
    Scientific journal

  • Kei Takeya, Takeshi Sugahara, Kazunari Ohgaki, Atsushi Tani
    Electron spin resonance (ESR) study on gamma-irradiated synthetic ethylene hydrate was performed to investigate induced radicals and their thermal stability. ESR spectra of induced 3-butenyl radical (center dot CH2C2H3=CH2, g = 2.0039 +/- 0.0005, A(alpha) =2.2 +/- 0.1 mT and A(beta) =3.0 0.1 mT) and induced ethyl radical (center dot C2H5, g = 2.0044 +/- 0.0005, A(alpha) = 2.2 +/- 0.1 mT and A(beta) = 2.7 0.1 mT) were observed in irradiated ethylene hydrate. The decay of the 3-butenyl radicals was observed above 200 K with the activation energy of 51.9 +/- 4.4 kJ/mol. The obvious decay of ethyl radicals starts above 240 K that is close to the dissociation temperature of ethylene hydrate at atmospheric Pressure. The activation energy of the ethyl radical decay is estimated as 63.4 +/- 8.2 kJ/mol and nearly equal to the enthalpy change of ethylene hydrate into liquid water and gaseous ethylene. It is Suggested that the decay of ethyl radicals Would be caused by the hydrate dissociation and that ethylene hydrate dissociates into water (supercooled) and ethylene at 240-265 K. (c) 2007 Elsevier Ltd. All rights reserved.
    PERGAMON-ELSEVIER SCIENCE LTD, Sep. 2007, RADIATION MEASUREMENTS, 42(8) (8), 1301 - 1306, English
    [Refereed]
    Scientific journal

  • Kei Takeya, Kouhei Nango, Takeshi Sugahara, Kazunari Ohgaki, Atsushi Tani, Hironori Ito, Michio Okada, Toshio Kasa
    Electron spin resonance (ESR) studies have been performed to investigate radicals induced in ethane hydrate irradiated by gamma-rays at 77 K. Two ESR spectra are observed and identified as the induced ethyl radical (g = 2.0031 +/- 10.0005, A(alpha perpendicular to) = 2.2 +/- 0.1 mT, A(alpha parallel to) = 2.5 +/- 0.1 mT, A(beta) = 2.7 +/- 0.1 mT) and induced atomic hydrogen (g = 2.0026 +/- 0.0005, A = 50.5 +/- 0.1 mT). From the results of ESR analysis and gas mass spectroscopy, it is concluded that the ethyl radical decays into butane by dimerization in the first-order reaction in the temperature region of 250-265 K. The activation energy of the decay reaction is 73.1 +/- 16.3 kJ/mol, which is near the dissociation enthalpy change of ethane hydrate to liquid water and gaseous ethane. This finding implies that ethane hydrate does not dissociate into ice but supercooled water in the present temperature region, similar to the dissociation of methane hydrate in our previous study.
    INST PURE APPLIED PHYSICS, May 2007, JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, 46(5A) (5A), 3066 - 3070, English
    [Refereed]
    Scientific journal

  • Kana Nagashima, Ryuji Tada, Hiroyuki Matsui, Tomohisa Irino, Atsushi Tani, Shin Toyoda
    Orbital- and millennial-scale variations in the Asian monsoon and its probable association with the Dansgaard-Oeschger (D-O) Cycles have been demonstrated by previous studies. However, the origin and nature of such variations are poorly understood. The Japan Sea is located down wind of the arid areas of the Eurasian continent, and thus receives significant amounts of aeolian dust. Consequently, the hemipelagic sediments of the Japan Sea are expected to record a continuous aeolian dust accumulation, which may provide information about the past variations in Asian monsoon. Grain size, flux, and provenance of aeolian dust in the sediments were examined using two sediment cores obtained from the northern and southern parts of the Japan Sea in order to understand the spatial variability of Asian monsoon. Since the silt fraction of the detrital materials in hemipelagic sediments of the Japan Sea is composed predominantly of aeolian dust, the grain size, flux, and provenance of the silt fraction were examined. The Taklimakan Desert-Loess Plateau and Siberia-Northeast China areas were identified as possible source areas of aeolian dust in the sediments of the Japan Sea based on the Electron Spin Resonance (ESR) signal intensity and crystallinity of quartz. Moreover, the relative contribution of aeolian dust from each source area was estimated based on the ESR signal intensity and crystallinity of quartz. Aeolian dust fluxes from the two source areas at the southern site were then estimated. Grain size and flux of eolian dust at the northern site, and fluxes of aeolian dust from two source areas at the southern site show orbital-scale variations in harmony with the insolation change at 30° N in June. These results indicate orbital-scale changes in the extent of the arid area and/or frequency of dust storms in the Taklimakan Desert-Loess Plateau and Siberia-Northeast China areas, and suggest that southward (northward) shifts of the westerly jet axis occurred together with either intensified (weakened) winter monsoon, decreased (increased) winter precipitation in the Siberia-Northeast China area, or southeastward (northwestward) shifts of summer monsoon limit during periods of smaller (larger) insolation at 30° N in June. In addition to these orbital-scale variations, millennial-scale variations possibly associated with the D-O Cycles are observed in the grain size record of aeolian dust at the two sites. Based on analogy with orbital-scale variations, these millennial-scale variations are considered to reflect millennial-scale changes in the position of the westerly jet axis together with the changes either in winter monsoon intensity, winter precipitation, or position of summer monsoon limit. Our results suggest N-S oscillations in the westerly jet and summer monsoon limit, and changes in the intensity of the winter monsoon on orbital and millennial timescales. © 2007 Elsevier B.V. All rights reserved.
    Apr. 2007, Palaeogeography, Palaeoclimatology, Palaeoecology, 247(1-2) (1-2), 144 - 161, English
    [Refereed]
    Scientific journal

  • Development of in situ low temperature infrared spectroscopy for a study of methane hydrate
    K. Ishikawa, A. Tani, S. Nakashima
    2007, Physics and Chemistry of Ice, 233 - 239
    [Refereed]
    International conference proceedings

  • Kobayashi, H., Ueda, T., Miyakubo, K., Eguchi, T., Tani, A.
    2007, Bulletin of the Chemical Society of Japan, 80(4) (4)
    [Refereed]
    Scientific journal

  • Sun, YB, Tada, RJ, Chen, J, Chen, HZ, Toyoda, S, Tani, A, Isozaki, Y, Nagashima, K, Hasegawa, H, Ji, JF
    2007, Atmospheric Environment, 41(38) (38)
    [Refereed]
    Scientific journal

  • Nagashima, K., Tada, R., Tani, A., Toyoda, S., Sun, Y., Isozaki, Y.
    2007, Geochemistry, Geophysics, Geosystems, 8(2) (2)
    [Refereed]
    Scientific journal

  • Kenji Ishikawa, Atsushi Tani, Takahiro Otsuka, Satoru Nakashima
    The stability of methyl radicals formed in synthetic methane hydrate by gamma-ray irradiation at 77 K was studied at 200-273 K and 10 MPa. The methyl radicals decayed under these conditions, despite the stability of methane hydrate, and changed into other molecules that could not be detected by electron spin resonance (ESR). Decay products were investigated by gas cell infrared (IR) spectroscopy by measuring the decomposed gas from the gamma-irradiated methane hydrate. Only ethane molecules were detected from the irradiated sample, while these were absent in an unirradiated sample. The molar ratio of ethane to methane (C2H6/CH4) was 12 +/- 1 ppm, which did not contradict with that of methyl radical to methane (CH3./CH4) in the literature. Hence, most of the methyl radicals generated by irradiation were supposed to be transformed to ethane in methane hydrate.
    INST PURE APPLIED PHYSICS, Jan. 2007, JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, 46(1) (1), 455 - 460, English
    [Refereed]
    Scientific journal

  • A. Tani, K. Ishikawa, K. Takeya
    Synthetic methane hydrate irradiated by gamma-rays at 77 K was measured by electron spin resonance (ESR) to investigate the thermal stability of the methyl radical under different pressures from 0.003 to I MPa. The decay of the radical was composed of at least two decay processes. The first decay process was observed within an annealing time of 150 min and the second one on a longer time scale. The decay constant for the second process was estimated using a second order decay model. An Arrhenius plot gave almost the same activation energy at lower temperature under each pressure, and it was estimated to be 20.0 +/- 2.7 kJ/mol. (c) 2006 Elsevier Ltd. All rights reserved.
    PERGAMON-ELSEVIER SCIENCE LTD, Aug. 2006, RADIATION MEASUREMENTS, 41(7-8) (7-8), 1040 - 1044, English
    [Refereed]
    Scientific journal

  • Masashi Takada, Atsushi Tani, Aiko Shimada
    The study investigated the luminescence behaviour of natural olivine to discuss the potential for Cenozoic (quaternary) dating. The UV-blue thermoluminescence (TL) glow curves of irradiated olivines have a resolved peak at 190 degrees C and other peaks at higher temperature at lower dose levels, and broad signals around 275-310 and 375-400 degrees C at higher dose levels. The UV-blue TL increases with additional laboratory dose to similar to 1.6 kGy within a plateau temperature region, suggesting the possibility of dosimetry and Cenozoic dating. Both infrared stimulated luminescence (IRSL) and blue light stimulated luminescence (BLSL) were detected from laboratory-irradiated olivines although the BLSL was weaker than the IRSL. Furthermore, post-BL IRSL was detected but post-IR BLSL was not observed. Therefore, IR stimulation is recommended for optically stimulated luminescence measurements with natural olivine. The growth of the IRSL signal component with doses less than several tens of Gy are too weak to measure. The dose-response curves suggest that further investigations on various types of olivine are needed for practical IRSL dating in the late Pleistocene or more recent. (c) 2006 Elsevier Ltd. All rights reserved.
    PERGAMON-ELSEVIER SCIENCE LTD, Aug. 2006, RADIATION MEASUREMENTS, 41(7-8) (7-8), 982 - 986, English
    [Refereed]
    Scientific journal

  • 仲辻 健太郎, 竹家 啓, 谷 篤史, 菅原 武, 大垣 一成
    公益社団法人 化学工学会, 2006, 化学工学会 研究発表講演要旨集, 2006, 596 - 596, Japanese

  • 竹家 啓, 菅原 武, 谷 篤史, 大垣 一成
    公益社団法人 化学工学会, 2006, 化学工学会 研究発表講演要旨集, 2006, 719 - 719, Japanese

  • K Takeya, K Nango, T Sugahara, K Ohgaki, A Tani
    The thermal stability of gamma-ray-induced methyl radicals in methane hydrate was studied using the ESR method at atmospheric pressure and 210-260 K. The methyl radical decay proceeded with the second-order reaction, and ethane molecules were generated from the dimerization process. The methyl radical decay proceeds by two different temperature-dependent processes, that is, the respective activation energies of these processes are 20.0 +/- 1.6 kJ/mol for the lower temperature region of 210-230 K and 54.8 +/- 5.7 kJ/mol for the higher temperature region of 235-260 K. The former agrees well with the enthalpy change of methane hydrate dissociation into ice and gaseous methane, while the latter agrees well with the enthalpy change into liquid water and gaseous methane. The present findings reveal that methane hydrates dissociate into liquid (supercooled) water and gaseous methane in the temperature range of 235-260 K.
    AMER CHEMICAL SOC, Nov. 2005, JOURNAL OF PHYSICAL CHEMISTRY B, 109(44) (44), 21086 - 21088, English
    [Refereed]
    Scientific journal

  • T Yada, K Norizawa, A Tani, M Ikeya
    Antarctic ice and rime ice after T-irradiation at 77 K were studied by electron spin resonance (ESR). The signal of nitrogen dioxide (NO2) was detected in both ices. The NO2 in the Antarctic ice, in particular, may be created from NO3- by reactions associated with intrinsic OH radicals. The detection limit of NO2 in solid samples was estimated to be similar to0.02 ppm with ESR. The analysis using ESR, in natural ice has a potential to trace environmental NO2. (C) 2004 Elsevier Ltd. All rights reserved.
    PERGAMON-ELSEVIER SCIENCE LTD, Feb. 2005, APPLIED RADIATION AND ISOTOPES, 62(2) (2), 255 - 259, English
    [Refereed]
    Scientific journal

  • K Takeya, A Tani, T Yada, M Ikeya
    Natural methane hydrate under deep ocean floor in Ocean Drilling Program (ODP) Leg 164 was studied by electron spin resonance (ESR) after gamma-ray irradiation. The methyl radical (g = 2.0024 +/- 0.0005, A = 2.3 +/- 0.1 mT) as well as an unidentified signal was observed. Although the parameters and the thermal stability. were very similar to those in a synthetic sample, the signal. intensity was about one eightieth of that in synthetic one because methane hydrate had partially changed to ice. ESR signal intensity of the methyl radical after gamma-ray irradiation could be used to estimate the amount of methane hydrate in a sample mixed with ice. (C) 2004 Published by Elsevier Ltd.
    PERGAMON-ELSEVIER SCIENCE LTD, Feb. 2005, APPLIED RADIATION AND ISOTOPES, 62(2) (2), 371 - 374, English
    [Refereed]
    Scientific journal

  • A Tani, T Ueno, C Yamanaka, M Katsura, M Ikeya
    A scanning electron spin resonance (ESR) microscope using a localized microwave field was redesigned to measure ESR spectra from 0 to 400 mT using electromagnets: Divalent copper ion (Cu2+) in copper sulfate pentahydrate (CuSO4.5H(2)O) was imaged, after the powdered samples were cemented in silicone rubber under a magnetic field. The ratio of the two signal intensities at g = 2.27 and 2.08 clearly indicates the orientation of the particles. This method can be used for mapping the local magnetic field and its direction. (C) 2004 Published by Elsevier Ltd.
    PERGAMON-ELSEVIER SCIENCE LTD, Feb. 2005, APPLIED RADIATION AND ISOTOPES, 62(2) (2), 343 - 348, English
    [Refereed]
    Scientific journal

  • Kobayashi, H, Ueda, T, Miyakubo, K, Toyoda, J, Eguchi, T, Tani, A
    2005, Journal of Materials Chemistry, 15(8) (8)
    [Refereed]
    Scientific journal

  • K Takeya, A Tani, T Yada, M Ikeya, K Ohgaki
    Synthetic methane hydrate irradiated by gamma-rays at 77 K has been measured by electron spin resonance (ESR). The quartet signal at g = 2.0029 +/- 0.0005 with the intensity ratio of approximately 1 : 3 : 3 : I and hyperfine coupling constant A = 2.3 +/- 0.1 mT was identified as the methyl radical (CH3..). The dose response of its signal intensities showed that the radicals were formed linearly up to 10 kGy with the G-value [the formation efficiency of radical pairs per 100 eV (16 aJ)] of 0.05. According to annealing experiments, the radical became unstable over 200 K, at which thermal dissociation of the hydrate had already started, but a very weak signal was detectable up to 270 K. The methyl radical thermally decayed following second-order kinetics with an activation energy of 0.26 +/- 0.02 eV (42 zJ). The existence of the signal at 270 K would be related to the extremely slow dissociation referred to as the self-preservation effect of the gas hydrate.
    INST PURE APPLIED PHYSICS, Jan. 2004, JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, 43(1) (1), 353 - 357, English
    [Refereed]
    Scientific journal

  • H Sato, A Tani, AJ Fielding, SS Eaton, GR Eaton, NE Whitehead, M Ikeya
    Nitrate radical NO32- in calcitic evaporate was discovered in Antarctica. The distribution and formation of nitrate radical NO32- in the calcite have been studied by pulse and continuous-wave electron spin resonance. In samples that had been annealed to destroy the NO32-, regeneration of the radical by gamma-rays or UV light indicated that the radical was formed by UV light (with wavelengths less than 340 nm) from solar rays, not by environmental radiation. The nonuniform spatial distribution of the nitrate radical, which was deduced from high ratios of local spin density to total spin density, suggests that the nitrate impurity was introduced into the calcium carbonate after carbonate grain formation. Formation of the carbonate-containing nitrate requires the presence of high amounts of nitrate and a dry climate. Formation of the nitrate radical requires sample exposure to UV light. These conditions are satisfied in the environment of Antarctica.
    SPRINGER WIEN, 2004, APPLIED MAGNETIC RESONANCE, 26(4) (4), 601 - 616, English
    [Refereed]
    Scientific journal

  • H Sato, A Tani, M Ikeya
    Free radicals ascribed to ascorbic acid (AscHZ), vitamin C, in the solid matrix of synthetic calcium carbonate have been studied using electron spin resonance (ESR) after UV irradiation. A new ESR signal with g-factors of g(parallel to) = 2.0024 and g(perpendicular to) = 2.0053 was found together with a broad singlet signal around g = 2.005 and a doublet signal at g = 2.0053 separated by 0.18 mT due to the ascorbyl radical (Asc(.-)). The molecular orbitals of Asc(.-) and two other types of ascorbyl radical (AscH(.-)) were calculated using the semi-empirical PM3 unrestricted Hartree-Fock (UHF) method, which indicated that the hyperfine splitting due to hydrogen bonded to one of the carbons in the pentagonal ring was dominant. The axial signal was ascribed to AscH(.-), while the doublet signal was ascribed to Asc(.-) in CaCO3. Possible pharmaceutical and nutritional applications of embedding unstable active molecules into the crystalline lattice of CaCO3 and a new nondestructive method for determination of vitamin C contents are discussed because the vitamin C has higher thermal stability in the carbonate than that in aqueous solution.
    INST PURE APPLIED PHYSICS, Feb. 2003, JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, 42(2A) (2A), 428 - 433, English
    [Refereed]
    Scientific journal

  • Takada, M., Tani, A., Miura, H., Moriwaki, K., Nagatomo, T.
    2003, Quaternary Science Reviews, 22(10-13) (10-13)
    [Refereed]
    Scientific journal

  • TANI Atsushi, UENO Takehiro
    The Geological Society of Japan, 2002, Annual Meeting of the Geological Society of Japan, 2002, 253 - 253, Japanese

  • A. Tani, C. Yamanaka, M. Ikeya, O. Ohtaka, M. Takada, T. Katsura
    Optically stimulated luminescence (OSL) of synthetic stishovite was investigated for a future dating technique of meteor impact craters. Luminescence around 330 nm was measured on the γ-ray irradiated stishovite under two stimulating light sources of infrared laser (830 nm) and blue light emitting diode set (470 nm). Thermoluminescence (TL) studies before and after the OSL measurements showed the intensities around 100-200 °C and 220-350 °C to increase and those around 350-450 °C to decrease. This indicates that a part of deep-trapped charges excited during the OSL measurements were retrapped by shallower traps. The infrared stimulated luminescence (IRSL) after the TL measurement up to 450 °C could not be detected, while the blue light stimulated luminescence (BLSL) after TL had about one-tenth of the intensity before TL. This indicates that a part of the charges in shallower traps were detrapped thermally and returned to the deeper traps which were related to BLSL. The result implies that some of the BLSL-related traps are quite stable at room temperature and could be used for geological dating. In addition, two paramagnetic centers produced by sudden release of high pressure in synthesis process were found in the unirradiated stishovite by electron spin resonance (ESR). Their g-factors are g∥ = 2.00181 and g⊥ = 2.00062 for an axial signal and g = 2.00305 for the other isotropic signal. These signals could be used for an evidence of impacts if those signals could be stored in geological time.
    Elsevier Science Ltd, Dec. 2000, Radiation Measurements, 32(5) (5), 473 - 477, English
    [Refereed]
    Scientific journal

  • A Tani, C Yamanaka, M Ikeya, O Ohtaka, T Katsura
    A new unidentified electron center in gamma-ray-irradiated synthetic stishovite, a high-pressure polymorph of SiO2, was detected by X-band electron spin resonance. It has an anisotropic g-factor of orthorhombic symmetry, g(1) = 1.9764, g(2) = 1.9527 and g(3) = 1.9370. The signal intensity was saturated at a microwave power of 2 mW. Annealing experiments show that the center was annealed out around 280 K and unstable at room temperature. The center may be ascribed to a titanium electron center on the basis of a relatively large g-shift and a comparison with the paramagnetic centers in quartz.
    SPRINGER WIEN, 2000, APPLIED MAGNETIC RESONANCE, 18(4) (4), 559 - 564, English
    [Refereed]
    Scientific journal

  • A new method for the estimation of cooling and denudation rates using paramagnetic centers in quartz: A case study on the Eldzhurtinskiy Granite, Caucasus
    Grün, R., Tani, A., Gurbanov, A., Koshchug, D., Williams, I., Braun, J.
    1999, Journal of Geophysical Research B: Solid Earth, 104(B8) (B8)
    [Refereed]
    Scientific journal

  • Jens Bartoll, Atsushi Tani
    Electron spin resonance (ESR) spectroscopy is a sensitive tool for distinguishing between 'burned' and 'unburned' states of archaeological objects. Prehistoric heating conditions, such as the temperature, atmosphere, time of exposure to heat, and when the heating took place, can be studied by this method with some success. ESR 'reporters', such as (a) radiation defects, (b) pyrolytic defects, and (c) transition metal ions, can even reflect changes induced at relatively low temperatures (e.g., in the range of 200°C for objects containing organic compounds). Several ESR heating markers are so stable that samples dating back to the ages when fire first began to be used can be analyzed today. An overview is presented of the literature concerning objects, such as stone, soil, pottery, and plant and animal products.
    Last, Springer Verlag, 1998, Naturwissenschaften, 85(10) (10), 474 - 481, English
    [Refereed]
    Scientific journal

  • Pulsed charge model of fault behavior producing seismic electric signals (SES)
    M Ikeya, S Takaki, H Matsumoto, A Tani, T Komatsu
    The electromagnetic (EM) behavior of a geological fault is postulated to follow the mathematical model of a fault in seismology that illustrates seismic EM anomalies (EMAs). Charge densities, +q and -q in C/m(2) are generated at a fault zone by the change in seismic stress, sigma as dq/dt = -alpha d sigma/dt - q/epsilon rho, where sigma,epsilon and rho are the charge generation constants measured in C/N, dielectric constant and resistivity of bedrocks, respectively. A fault of length, 2a, plane area, A and the displacement or rupture time, tau gives pulsed charge densities, +g(t) and -q(t), or a dipole moment of P(t) = 2aAq(t) = alpha M-0[epsilon rho/(tau-epsilon rho)][exp(-t/tau) - exp(-t/epsilon rho)] using the earthquake moment M-0. Maxwell's equations for this dipole in a conductive earth give power spectra of EM waves at different distances. Seismic electric signals (SES) including the DC VAN method can be explained as EM waves. Electrons with density n in the atmosphere are accelerated by the electric field and travel a distance l, resulting in the excitation and ionization of atmospheric molecules leading to earthquake lightning (EQL). They also polarize the ionosphere by disturbing the transmission of EM waves. Preliminary results of pulsed electric field measurements are presented for lightning, prior to an earthquake and artificial electronic noises. The same pulsed field surprised eels and hamsters, suggesting seismic anomalous animal behavior (SAAB) as electro-physiological responses to the stimuli of electric pulses.
    WORLD SCIENTIFIC PUBL CO PTE LTD, Jun. 1997, JOURNAL OF CIRCUITS SYSTEMS AND COMPUTERS, 7(3) (3), 153 - 164, English
    [Refereed]
    Scientific journal

  • M Ikeya, H Ochiai, A Tani
    Models of uranium-uptake at the early stage and at a constant rate (linear-uptake) were reexamined for ESR dating of fossil bones and teeth. An analytical equation for the total dose of natural radiation (D-T) was obtained for uranium uptake in the form of a saturation function, C-U(t) = C-US(1 - e(-lambda t)), where C-US is the saturation level of the uranium and lambda is the uranium uptake rate, presumably associated with the decomposition rare of organic materials and the diffusion of uranium. The present uranium content C-U(T) = C-U* at the unknown age T gives C-US = C-U*/(1 - e(-lambda T)) and so lambda = -(1/T)ln(1 - C-U*/C-US). The D-T calculated by taking U-238-series secular disequilibrium into account is reduced to that of an early uptake for lambda T much greater than 1 and to that of a linear uptake for lambda T much less than 1. The activity ratios of U-234/U-238 and Th-230/U-238 for the saturation-uptake model are also given. The model of linear uptake is applicable for C-U* < C-US. The curves of D-T as a function of T were calculated for C-US as a parameter. (C) 1997 Elsevier Science Ltd.
    PERGAMON-ELSEVIER SCIENCE LTD, Apr. 1997, RADIATION MEASUREMENTS, 27(2) (2), 339 - 343, English
    [Refereed]
    Scientific journal

  • R Grun, H Kohno, A Tani, C Yamanaka, M Ikeya, HP Huang
    Deconvolution of X-band spectra has shown that the signal that is used in dating studies is composed of at least three different peaks. Our measurements show that pulsed ESR can separate the axial signal from two wider peaks that are suspected of interfering with any reliable dose assessment. However, its significantly lower sensitivity prohibits the routine application of pulsed ESR in dating studies. The spin relaxation time, T-2, of the CO2- centre as determined from spin echo decay curves, is in the range of about 500 to 640 ns, depending on the spin concentration. (C) 1997 Elsevier Science Ltd.
    PERGAMON-ELSEVIER SCIENCE LTD, Apr. 1997, RADIATION MEASUREMENTS, 27(2) (2), 425 - 431, English
    [Refereed]
    Scientific journal

  • T Oka, R Grun, A Tani, C Yamanaka, M Ikeya, HP Huang
    We have used thin sections of an archaeological tooth sample to obtain spatially resolved ESR spectra using a pin-hole cavity. This study presents the first ESR images of naturally generated radiation sensitive signals. The 3-D plots of the natural and irradiated samples show strong variations of the ESR intensities within the enamel layers. Owing to the relatively large scattering of the data points it has not been possible to produce 3-D dose plots. (C) 1997 Elsevier Science Ltd.
    PERGAMON-ELSEVIER SCIENCE LTD, Apr. 1997, RADIATION MEASUREMENTS, 27(2) (2), 331 - 337, English
    [Refereed]
    Scientific journal

  • A Tani, J Bartoll, M Ikeya, K Komura, H Kajiwara, S Fujimura, T Kamada, Y Yokoyama
    Electron spin resonance (ESR) of Fe3+ ions and of radiation-induced centers in quartz (E', peroxy and Al centers) was studied to distinguish between burnt and unburnt stone tools and to determine their age. The yellow stone tool with a reddish edge discovered at the paleolithic site in Kamitakamori, northern Japan, was investigated. The ESR spectrum intensity of Fe3+ ions around g = 4.3 and the color of the material changed at 600 degrees C and 240 degrees C, respectively, which indicates that the red part was heated at 240-600 degrees C. The E' center in the red part was used for dating because isochronal annealing experiments showed low thermal stability of the Al center and overlap of broad signals at g = 2.0086 onto the peroxy center. Assuming the same efficiency of defect formation in the red part as of that in the laboratory-heated material at 450 degrees C, the obtained age of 520-770 ka is in concordance with the ages of the tephra layers at the site.
    SPRINGER VERLAG, 1997, APPLIED MAGNETIC RESONANCE, 13(3-4) (3-4), 561 - 569, English
    [Refereed]
    Scientific journal

  • A Tani, H Kohno, C Yamanaka, M Ikeya
    A new ESR isochrone dating for fracture age based on the effective annual dose for different grain sizes has been applied to quartz grains in fractured granite at the Nojima fault that moved during the earthquake in 1995 and in fault gouge at the Rokko fault in the vicinity. Incomplete resetting of ESR signals was observed for both samples collected at the ground surface. The fracture age of the quartz grains was obtained for the Rokko fault as (1.6 +/- 0.2) x 10(5) yr. At the Nojima fault there appears to be a considerable effect from previously-fractured surfaces in the newly-fractured material. The relation between the fracture age and the age of the fault movement is discussed. Copyright (C) 1996 Elsevier Science Ltd
    PERGAMON-ELSEVIER SCIENCE LTD, Nov. 1996, APPLIED RADIATION AND ISOTOPES, 47(11-12) (11-12), 1423 - 1426, English
    [Refereed]
    Scientific journal

  • J Bartoll, A Tani, M Ikeya, T Inada
    Electron spin resonance (ESR) of transition metal ions (Mn2+, Fe3+), radiation induced centres and pyrolytically formed radicals was studied to distinguish between burnt and unburnt soil. A testfire place and samples from an archaeological site were analyzed. The concentration of radiation induced centres decreases and pyrolytically formed radicals appear in a thermal annealing experiment. The spectral pattern of iron and manganese resonances changes during the heating process. These signals are useful to estimate temperature and atmosphere of the heating event. Chemithermoluminescence (CTL) of the soil was studied and could reveal its thermal history, too.
    SPRINGER VERLAG, 1996, APPLIED MAGNETIC RESONANCE, 11(3-4) (3-4), 577 - 586, English
    [Refereed]
    Scientific journal

  • M IKEYA, A TANI, C YAMANAKA
    A new isochrone method of electron spin resonance (ESR) dating has been proposed utilizing the different average dose rates of external radiation for different grain sizes due to the range of external alpha- and beta-rays., The equivalent doses (EDs) obtained by the additive dose method were plotted as a function of the external dose rate (D-ex) corrected for the grain sixes. The slope gives an ESR isochrone age since the fracture (T-trn) or the surface formation; the coordinate abscissa gives the internal dose (DmTfor) where D-in is the internal dose rate and T-for is the age of the mineral formation. The method has been applied to quartz (SiO2) grains in geological fault gouge at outcrops of the Rokko Fault giving T-fra=102,000 years and T-for of nearly zero for grains less than 100 mu m.
    JAPAN J APPLIED PHYSICS, Mar. 1995, JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS, 34(3A) (3A), L334 - L337, English
    [Refereed]
    Scientific journal

■ MISC
  • Sterilization by peroxynitric acid generated in plasma-treated water
    北野勝久, 井川聡, 中島陽一, 谷篤史
    2023, 静電気学会誌, 47(6) (6)

  • プラズマ誘起液中化学反応場の反応速度論的な理解
    北野勝久, 井川聡, 中島陽一, 横山高史, 谷篤史
    2019, 応用物理学会春季学術講演会講演予稿集(CD-ROM), 66th

  • プラズマ誘起液中化学反応場の反応速度論的な理解
    北野勝久, 井川聡, 中島陽一, 横山高史, 谷篤史
    2019, 応用物理学会秋季学術講演会講演予稿集(CD-ROM), 80th

  • 2-4-4 Difference of guest molecule interaction on TBA / TBP bromide hydrates
    三輪泰大, 嶋田仁, 長濱朋輝, 佐藤春実, 谷篤史, 竹家啓
    2019, 日本エネルギー学会大会講演要旨集(Web), 28

  • Yasuhiro Miwa, Keisuke Matsumura, Kei Takeya, Atsushi Tani
    Tetrabutylammonium bromide (TBAB) hydrate, a semi-clathrate hydrate was investigated by terahertz time-domain spectroscopy (THz-TDS) in the region from 0.1 to 1.5 THz. The high absorption was observed in the whole region in comparison with that in ice and propane hydrate. In addition, absorption band was clearly observed around 1.1 THz, though ice and propane hydrate does not have such a peak at this frequency. This peak in TBAB hydrate may be caused by intermolecular vibration of tetrabutylammonium ion because TBAB crystal also has infrared activity at 1.4 THz. In TBAB hydrate, tetrabutylammonium ion is isolated by hydrogen-bonded water molecules, which might cause the absorption peak shift to lower frequency. THz-TDS is worthwhile to observe the interaction of guest-guest and/or guest-host molecules.
    29 Oct. 2018, 2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), 2018-September, English
    [Refereed]
    Summary national conference

  • 過硝酸溶液を利用した世界初の殺菌手法
    北野勝久, 井川聡, 中島陽一, 谷篤史
    2018, 日本防菌防黴学会年次大会要旨集, 45th

  • プラズマ誘起液中化学反応場における液中化学種の診断
    KITANO Katsuhisa, TANI Atsushi, IKAWA Satoshi, NAKASHIMA Yoichi
    Dec. 2017, プラズマエレクトロニクス分科会会報, 67, Japanese
    Introduction scientific journal

  • 歯周病原菌に対するLactobacillus属細菌により産生される抗菌成分の同定(Determination of the antibacterial constituents produced by lactobacilli against a periodontal pathogen)
    河井 智美, 大島 朋子, 新 良一, 井川 聡, 谷 篤史, 稲角 直也, 前田 伸子
    日本細菌学会, Feb. 2017, 日本細菌学雑誌, 72(1) (1), 137 - 137, English

  • 過硝酸溶液を用いた新しい殺菌手法の提案
    北野勝久, 井川聡, 中島陽一, 谷篤史
    2017, 日本防菌防黴学会年次大会要旨集, 44th

  • プラズマ処理水中における過硝酸の生成過程
    北野勝久, 井川聡, 中島陽一, 谷篤史
    2017, 応用物理学会秋季学術講演会講演予稿集(CD-ROM), 78th

  • Methane Hydrate(2)Origin, Exploration and Resources of Methane Hydrate
    佐藤 幹夫, 長久保 定雄, 内田 努, 谷 篤史
    日本エネルギー学会, Jul. 2016, Journal of the Japan Institute of Energy = 日本エネルギー学会誌, 95(7) (7), 572 - 585, Japanese

  • Lactobacillus fermentumによって産生されたPorphyromonas gingivalisに対する抗菌物質
    河井 智美, 大島 朋子, 新 良一, 井川 聡, 谷 篤史, 稲角 直也, 水谷 武夫, 三浦 竜介, 五味 一博, 前田 伸子
    (公財)腸内細菌学会, Apr. 2016, 腸内細菌学雑誌, 30(2) (2), 96 - 96, Japanese

  • 大気圧低温プラズマならびにプラズマ処理水を用いた先進的消毒技術
    北野勝久, 井川聡, 中島陽一, 谷篤史, 大島朋子, 横山高史
    2016, 日本医療・環境オゾン学会会報, 23(1) (1)

  • 反応速度論に基づくプラズマ処理水殺菌活性のpH依存の物理化学機構
    北野勝久, 井川聡, 中島陽一, 横山高史, 谷篤史
    2016, 応用物理学会春季学術講演会講演予稿集(CD-ROM), 63rd

  • プラズマ誘起液中化学反応における溶液中活性種の診断
    北野勝久, 井川聡, 中島陽一, 谷篤史
    2016, 応用物理学会秋季学術講演会講演予稿集(CD-ROM), 77th

  • 殺菌力のあるプラズマ処理水生成における雰囲気ガスの重要性
    谷篤史, 井川聡, 中島陽一, 北野勝久
    2015, 電子スピンサイエンス学会年会講演要旨集, 54th

  • 殺菌剤としてのプラズマ処理水
    北野勝久, 井川聡, 中島陽一, 谷篤史
    2015, 応用物理学会春季学術講演会講演予稿集(CD-ROM), 62nd

  • ヒトチトクロームP450によるクロロピレンのin vitro代謝解析
    永吉晴奈, 柿本健作, 柿本健作, 稲角直也, 谷篤史, 小西良昌, 梶村計志, 大浦健, 中野武, 早川和一, 鳥羽陽
    2015, 環境化学討論会要旨集(CD-ROM), 24th

  • HOCO-CO2間で起こる分子間水素原子移動反応と惑星科学への応用
    大島基, 谷篤史, 北野勝久, 菅原武, 大垣一成
    2014, ESR応用計測, 30

  • 消毒のための高濃度プラズマ処理水の連続生成
    北野勝久, 井川聡, 中島陽一, 谷篤史
    2014, 応用物理学会春季学術講演会講演予稿集(CD-ROM), 61st

  • 反応速度論に基づくプラズマ処理水活性の温度依存の物理化学機構
    北野勝久, 井川聡, 中島陽一, 谷篤史
    2014, 応用物理学会秋季学術講演会講演予稿集(CD-ROM), 75th

  • O12-06 分子間水素原子移動によるHOCOラジカルの分解(口頭発表セッション12(分析・実験),口頭発表)
    大島 基, 谷 篤史, 菅原 武, 大垣 一成, 北野 勝久
    日本惑星科学会, 20 Nov. 2013, 日本惑星科学会秋期講演会予稿集, 2013, "O12 - 06", Japanese

  • Mechanism of Plasma Disinfection by Plasma Jet and its Applications : Physics, Chemistry, Molecular Biology in Effective Sterilization with the Reduced pH Method
    KITANO Katsuhisa, IKAWA Satoshi, TANI Atsushi, OHSHIMA Tomoko
    静電気学会, 31 May 2013, 静電気学会誌, 37(3) (3), 112 - 116, Japanese

  • Characteristics of gas hydrates through observation of radical species
    谷篤史, 菅原武, 大島基, 竹家啓, 大垣一成
    31 Mar. 2013, 低温科学, 71, 187-192, Japanese
    [Refereed][Invited]
    Report research institution

  • プラズマプロセスの新展開 医療応用の可能性
    北野勝久, 谷篤史, 井川聡, 大島朋子
    2013, クリーンテクノロジー, 23(2) (2)

  • クラスレートハイドレートを反応場とした水素原子移動を伴うHOCO/DOCOラジカルの反応
    大島基, 谷篤史, 菅原武, 大垣一成, 北野勝久
    2013, 電子スピンサイエンス学会年会講演要旨集, 52nd

  • 殺菌・消毒のためのプラズマ処理水生成と保存
    北野勝久, 井川聡, 谷篤史
    2013, 応用物理学会春季学術講演会講演予稿集(CD-ROM), 60th

  • Challenge to dating of methane hydrate formation
    谷 篤史
    海洋出版, 2013, 号外地球, (62) (62), 93 - 98, Japanese

  • Uchida, T., Sugahara, T., Ohgaki, K., Tanaka, H., Takeya, S., Tani, A.
    The symposium "Development in Scientific Researches on Gas Hydrates" was held at the 53< sup> rd< /sup> High Pressure Conference of Japan on November 2012. After some presentations in the symposium, the possibilities of improving or transcending the van der Waals & Platteeuw model for the phase equilibrium estimation including clathrate hydrate phase were discussed. In this article, a part of the discussion was reported.
    2013, Review of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu, 23(2) (2), 141 - 147, Japanese

  • Evaluation of lipid oxidation reaction toward the safety assessment of plasma medicine
    FUKUI Satoshi, TANI Atsushi, IKAWA Satoshi, KITANO Katsuhisa
    10 Dec. 2012, 電気学会研究会資料. PPT, パルスパワー研究会, 2012(108) (108), 53 - 58, Japanese

  • Evaluation of lipid oxidation reaction toward the safety assessment of plasma medicine
    FUKUI Satoshi, TANI Atsushi, IKAWA Satoshi, KITANO Katsuhisa
    10 Dec. 2012, 電気学会研究会資料. PST, プラズマ研究会, 2012(85) (85), 53 - 58, Japanese

  • ラジカルジェットにより液中に誘起されるラジカル種の診断
    谷篤史, 大野友輔, 福井智, 井川聡, 北野勝久
    2012, 応用物理学関係連合講演会講演予稿集(CD-ROM), 59th

  • プラズマ処理水におけるラジカル活性種
    谷篤史, 福井智, 井川聡, 北野勝久
    2012, 応用物理学会学術講演会講演予稿集(CD-ROM), 73rd

  • 大気圧低温プラズマによって液中に供給される一重項酸素と脂質酸化反応
    福井智, 谷篤史, 井川聡, 北野勝久
    2012, 応用物理学会学術講演会講演予稿集(CD-ROM), 73rd

  • 微量CH4を含むCO2ハイドレート内部に誘起されるラジカル種の挙動
    大島基, 谷篤史, 北野勝久, 菅原武, 大垣一成
    2012, 高圧討論会講演要旨集, 53rd

  • 大気圧プラズマにより水中へ導入される活性種の観察
    谷篤史, 福井智, 井川聡, 北野勝久
    2012, 電子スピンサイエンス学会年会講演要旨集, 51st

  • Plasma Sterilization Technique for Disinfection Treatments and Its Physicochemical Model
    KITANO Katsuhisa, IKAWA Satoshi, TANI Atsushi
    化学工学会, 05 Jun. 2011, Chemical engineering of Japan, 75(6) (6), 356 - 358, Japanese

  • Thermal Stability of Radicals Induced in Xenon Hydrate
    Kei Takeya, Atsushi Tani, Takeshi Sugahara, Kazunari Ohgaki
    Mar. 2011, Physics and Chemistry of Ice 2010, 267-271, English
    [Refereed]
    Summary national conference

  • Decay Mechanisms of Radiation-Induced Radicals in Sulfur Hexafluoride Clathrate Hydrate
    Kenji Takato, Atsushi Tani, Takeshi Sugahara, Kei Takeya, Kazunari Ohgaki
    Mar. 2011, Physics and Chemistry of Ice 2010, 261-266, English
    [Refereed]
    Summary national conference

  • In-situ ESR Observation of Methyl Radical in Gamma-Irradiated Methane Hydrate Under High Pressure
    Atsushi Tani, Kenji Takato, Takeshi Sugahara, Kazunari Ohgaki, Kei Takeya
    Mar. 2011, Physics and Chemistry of Ice 2010, 273-276, English
    [Refereed]
    Summary national conference

  • 大気圧低温プラズマジェットにより誘起された液中フリーラジカルを用いたプラズマ消毒治療
    北野勝久, 井川聡, 谷篤史, 大西直文
    2011, 電気学会全国大会講演論文集, 2011(7) (7)

  • ガンマ線を照射したCO2ハイドレート内部におけるラジカルの熱安定性と反応系
    大島基, 谷篤史, 北野勝久, 菅原武, 大垣一成
    2011, ESR応用計測, 28

  • 放射線照射を受けたCO2ハイドレートにおいて温度により変化するラジカルの反応
    大島基, 谷篤史, 北野勝久, 菅原武, 大垣一成
    2011, ESR応用計測, 27

  • Plasma antisepsis/sterilization (11) Development of the submerged sterilization technique with plasma for medical application
    井川 聡, 谷 篤史, 北野 勝久
    日本防菌防黴学会, 10 Dec. 2010, 防菌防黴 = Journal of antibacterial and antifungal agents, 38(12) (12), 819 - 825, Japanese

  • プラズマ誘起フリーラジカルによる液体殺菌
    北野勝久, 井川聡, 谷篤史, 大西直文, 浜口智志
    2010, 電気学会全国大会講演論文集, 2010(1) (1)

  • プラズマ液体プロセスにおける液中イオン・ラジカル生成機構
    北野勝久, 米森星矢, 谷篤史, 井川聡, 大西直文, 荒川隆一, 浜口智志
    2010, 応用物理学関係連合講演会講演予稿集(CD-ROM), 57th

  • 液体と非接触な大気圧プラズマ源を用いた液体の効果的殺菌
    北野勝久, 井川聡, 谷篤史, 大西直文
    2010, 応用物理学会学術講演会講演予稿集(CD-ROM), 71st

  • プラズマ液体プロセスにおける大気イオン由来の液中活性種生成
    北野勝久, 井川聡, 米森星矢, 谷篤史, 荒川隆一, 大西直文
    2010, 応用物理学会学術講演会講演予稿集(CD-ROM), 71st

  • プラズマ消毒治療のための大気圧ラジカルジェットによる効果的液体殺菌法
    北野勝久, 井川聡, 谷篤史, 大西直文
    2010, プラズマ・核融合学会年会(Web), 27th

  • Generation of free radicals in liquids by low-temperature atmospheric-pressure plasmas
    KITANO Katsuhisa, TANI Atsushi, IKAWA Satoshi, OHNISHI Naofumi, HAMAGUCHI Satoshi
    05 Sep. 2009, 電気学会研究会資料. PST, プラズマ研究会, 2009(103) (103), 19 - 22, Japanese

  • Bacteria inactivation by free radicals in liquid in contact with plasma
    IKAWA Satoshi, KITANO Katsuhisa, TANI Atsushi, OHNISHI Naofumi, HAMAGUCHI Satoshi
    05 Sep. 2009, 電気学会研究会資料. PST, プラズマ研究会, 2009(103) (103), 23 - 26, Japanese

  • 液体のプラズマ滅菌とメカニズム
    北野勝久, 井川聡, 谷篤史, 浜口智志
    2009, 電気学会全国大会講演論文集, 2009(1) (1)

  • 大気圧低温プラズマジェットを用いた液中滅菌プロセスの解明 III
    北野勝久, 井川聡, 谷篤史, 浜口智志
    2009, 応用物理学関係連合講演会講演予稿集, 56th(1) (1)

  • 液中プラズマプロセスにおける液中ラジカルの電子スピン共鳴法による診断 III
    北野勝久, 谷篤史, 溝谷浩平, 井川聡, 浜口智志
    2009, 応用物理学関係連合講演会講演予稿集, 56th(1) (1)

  • 液中プラズマプロセスにおける液中ラジカルの電子スピン共鳴法による診断 IV
    北野勝久, 谷篤史, 溝谷浩平, 井川聡, 大西直文, 浜口智志
    2009, 応用物理学会学術講演会講演予稿集, 70th(1) (1)

  • 液中プラズマプロセスでのラジカル生成における雰囲気ガスの効果
    谷篤史, 北野勝久, 溝谷浩平, 井川聡, 浜口智志
    2009, ESR応用計測, 25

  • 大気圧低温プラズマジェットを用いた液中滅菌プロセスの解明 IV
    北野勝久, 井川聡, 谷篤史, 大西直文, 浜口智志
    2009, 応用物理学会学術講演会講演予稿集, 70th(1) (1)

  • 液中プラズマプロセスにおける気中・液中フリーラジカル生成
    北野勝久, 谷篤史, 井川聡, 大西直文, 荒川隆一, 浜口智志
    2009, プラズマ・核融合学会年会(Web), 26th

  • 大気圧低温プラズマジェットを用いた液中ラジカル生成
    北野勝久, 谷篤史, 井川聡, 大西直文, 荒川隆一, 米森星矢, 浜口智志
    2009, 電子スピンサイエンス学会年会講演要旨集, 48th

  • 長島佳菜, 西戸裕嗣, 豊田新, 山本裕哉, 谷篤史, 五十嵐康人, 多田隆治
    河川や風によって陸上や海底へと運搬される砕屑物粒子は、その量や供給源の変化を調べることで、粒子の運搬に関わる諸現象（例えば河川流量や風の強さ、向きなど）の変動を解明することができる。そこで我々は、砕屑物粒子の供給源推定に向けた指標開発に取り組んできた。石英は地球上の様々な岩石に多く含まれ、また風化に強いという特性を持ち、運搬・堆積過程での変質を受けにくいため、供給源推定に用いるのに適している。特に我々が注目したのは、石英の結晶中の構造欠陥（不対電子や格子欠陥）や不純物元素を測定する、石英の電子スピン共鳴（Electron Spin Resonance：ESR）分析とカソードルミネッセンス（Cathodoluminescence : CL）分析である。本発表では、これらの指標が供給源推定にどれだけ有効であるのか、またSEM-CLを用いた分析で一石英粒子からの供給源推定が可能かどうかについて述べる予定である。
    一般社団法人日本地球化学会, 2009, 日本地球化学会年会講演要旨集, 56th(0) (0), 22 - 23, Japanese

  • ESR Spectral Analysis of Free Radicals in Irradiated Gas Hydrates below 77 K
    Atsushi Tani, Kei Takeya, Takeshi Sugahara, Kazunari Ohgaki
    Jul. 2008, Proceedings of the 6th International Conference on Gas Hydrates, 5707, English
    Summary national conference

  • 液中プラズマプロセスにおける液中ラジカルの電子スピン共鳴(ESR)法による珍断
    谷篤史, 北野勝久, 溝谷浩平, 浜口智志
    2008, 応用物理学関係連合講演会講演予稿集, 55th(1) (1)

  • 大気圧低温プラズマを用いた液中プラズマプロセスにおける生成ラジカル
    谷篤史, 北野勝久, 溝谷浩平, 浜口智志
    2008, ESR応用計測, 24

  • 液中プラズマプロセスにおける液中ラジカルの電子スピン共鳴法による診断 II
    谷篤史, 北野勝久, 溝谷浩平, 浜口智志
    2008, 応用物理学会学術講演会講演予稿集, 69th(1) (1)

  • 二酸化炭素とメタンの混合ハイドレートに生成するラジカル種とその反応
    谷篤史, 木谷晋輔, 竹家啓, 菅原武, 大垣一成, 大塚高弘, 中嶋悟
    2008, ESR応用計測, 24

  • ESR Observation of Self-Preservation Effect of Methane Hydrate
    Kei Takeya, Kouhei Nango, Takeshi Sugahara, Atsushi Tani, Kazunari Ohgaki
    30 Jul. 2007, Physics and Chemistry of Ice: Proceedings of the 11th International Conference on the Physics and Chemistry of Ice, 311, 585-591 - 591, English
    [Refereed]
    Summary national conference

  • 薄膜水の氷への構造変化の低温顕微赤外分光その場観測
    谷 篤史, 中島 悟, 石川 謙二, 古田 力矢, イシカワ ケンジ, フルタ リキヤ, タニ アツシ, ナカシマ サトル
    大阪大学低温センター, Apr. 2007, 大阪大学低温センターだより, 138, 13 - 17, Japanese

  • Decay reaction of methyl radicals in methane hydrate
    TANI Atsushi, ISHIKAWA Kenji, TAKEYA Kei
    メタンハイドレートに生成するラジカル種の安定性とその後の反応過程について研究した.主に生成するメテルラジカルは,メタンハイドレートが安定であっても温度によっては二次反応に従い減少すること,消滅後はエタンとなることがわかった.地球に存在するメタンハイドレートでは時間が経つにつれエタンが増加していくが,より低い温度の水衛星などでメタンハイドレートが形成されていれば,ハイドレート内にラジカルが蓄積することがわかった.一方,氷Ihに生成する主なラジカルのヒドロキシルラジカルは77Kでは見られなかった.氷物質中における化学反応を考える上で,メタンハイドレートのような有機物を含む氷物質の影響を考慮すべきことが示唆された.
    The Japanese Society for Planetary Sciences, 25 Mar. 2007, Planetary people, 16(1) (1), 47-52 - 52, Japanese
    [Refereed]
    Report scientific journal

  • 大気圧低温プラズマジェットを用いた液中プラズマプロセシング
    北野勝久, 古性均, 長崎幸夫, 井川聡, 谷篤史, 浜口智志
    2007, プラズマ・核融合学会年会(Web), 24th

  • プロパンハイドレートにおけるプロピルラジカルの変化
    谷篤史, 仲辻健太郎, 竹家啓, 菅原武, 大垣一成
    2007, 日本化学会講演予稿集, 87th(2) (2)

  • エチレンハイドレートに誘起されるラジカル種の熱安定性
    竹家啓, 仲辻健太郎, 菅原武, 谷篤史, 大垣一成
    2007, ESR応用計測, 23

  • メタンハイドレート中に生成するラジカル種とその反応について
    谷篤史, 村山達郎, 大塚高弘, 石川謙二, 竹家啓, 中嶋悟
    2007, 分子科学討論会講演要旨集(CD-ROM), 1st

  • P141 日本海に堆積する黄砂の供給源とその変動について
    長島 佳菜, 多田 隆治, Sun Youbin, 磯崎 裕子, 谷 篤史, 豊田 新
    日本気象学会, 2007, 大会講演予講集, 91, 277 - 277, Japanese

  • MURAYAMA Tatsuro, OTSUKA Takahiro, TANI Atsushi, NAKASHIMA Satoru
    THE JAPANESE SOCIETY OF SNOW AND ICE, 2007, Preprints of the Annual Conference, Japanese Society of Snow and Ice, 2007(0) (0), 102 - 102, Japanese

  • 谷篤史, 石川謙二, 竹家啓, 仲辻健太郎, 菅原武, 大垣一成
    23 Nov. 2006, 日本機械学会熱工学コンファレンス講演論文集, 2006, Japanese
    Summary national conference

  • Radiation effects on ice and clathrate hydrate for chronology and environmental assessment
    谷篤史, 法澤公寛, 矢田猛士, 竹家啓
    22 Mar. 2006, 低温科学, 64, 223-230, Japanese
    Report research institution

  • 自然放射線環境下におけるメタンハイドレート--ラジカルの生成とその熱安定性 (メタンシープとメタンハイドレート)
    石川 謙二, 谷 篤史
    海洋出版, Dec. 2005, 月刊地球, 27(12) (12), 976 - 981, Japanese

  • Thermal Stability of The Radiation-Induced Methyl Radical in Methane Hydrate under High Pressure
    Atsushi Tani, Kenji Ishikawa, Kei Takeya
    15 Jun. 2005, Proceedings of the 5th International Conference on Gas Hydrates, 5(1) (1), 1734-1738, English
    Summary national conference

  • Radicals Induced by gamma-ray Irradiation in Ethane and Ethylene Hydrates
    Kei Takeya, Kouhei Nango, Takeshi Sugahara, Kazunari Ohgaki, Atsushi Tani
    15 Jun. 2005, Proceedings of the 5th international conference on gas hydrates, 1, 279-283 - 283, English
    Summary national conference

  • γ線照射エタンハイドレート内に誘起したラジカルに関する研究
    南郷興平, 竹家啓, 菅原武, 大垣一成, 谷篤史
    2005, 高圧討論会講演要旨集, 46th

  • エタンハイドレート内部に誘起されたエチルラジカルに関する研究
    南郷興平, 竹家啓, 菅原武, 谷篤史, 大垣一成
    2005, ESR応用計測, 22

  • プロパンハイドレートの照射効果について
    仲辻健太郎, 南郷興平, 竹家啓, 菅原武, 谷篤史, 大垣一成
    2005, ESR応用計測, 22

  • メタンハイドレート中に誘起されたメチルラジカルの活性化エネルギー
    竹家啓, 南郷興平, 菅原武, 谷篤史, 大垣一成
    2005, ESR応用計測, 22

  • γ線照射されたガスハイドレートの熱ルミネッセンス
    谷篤史, 田近靖博, 竹家啓, 橋本哲夫
    2005, ESR応用計測, 22

  • 南極蒸発岩カルサイト中の硝酸ラジカルとその成因についての考察
    谷篤史, 佐藤英夫, 池谷元伺
    2004, 日本第四紀学会講演要旨集, (34) (34)

  • メタンハイドレートの照射効果について
    竹家啓, 矢田猛士, 谷篤史, 池谷元伺, 大垣一成
    2004, ESR応用計測, 21

  • スーパーナノ反応場の可能性
    谷篤史, 竹家啓, 矢田猛士
    2003, 未来を拓く高圧力科学技術セミナーシリーズ, (26) (26)

  • 地底から外惑星まで:電子スピン共鳴(ESR)年代測定と放射線計測の展開
    谷 篤史, 上野 剛弘, 池谷 元伺
    アイオニクス, 23 Nov. 2002, 21世紀連合シンポジウム-科学技術と人間-論文集, 1, 581 - 584, Japanese

  • Ueno Takehiro, Tani Atsushi, Hirai Makoto, Yoshiasa Akira, Yamanaka Chihiro, Tsuchiyama Akira, Ikeya Motoji
    The Geological Society of Japan, 2002, Annual Meeting of the Geological Society of Japan, 2002(0) (0), 167 - 167, Japanese

  • 29a-ZA-13 Point defects in stishovite (high-pressure phase of SiO_2)
    Tani Atsushi, Ikeya Motoji, Ohtaka Osamu, Katsura Tomoo
    The Physical Society of Japan (JPS), 15 Mar. 1999, Meeting abstracts of the Physical Society of Japan, 54(1) (1), 108 - 108, Japanese

  • 貫入花崗岩体の熱史の解明--ESR年代測定法の第四紀地質への展開 (総特集 高精度年代決定法とその応用--第四紀を中心として) -- (2章 放射線による損傷を計測する年代測定)
    谷 篤史, Grun R., Gurbanov A.
    海洋出版, 1999, 号外地球, (26) (26), 88 - 94, Japanese

  • Analysis of atmospheric variety of NO_x and SO_2 around Kobe City before the Kobe Earthquake.
    KOMATSU T., TANI A., IKEYA M.
    15 Sep. 1997, 日本地震学会講演予稿集 = Programme and abstracts, the Seismological Society of Japan, 1997(2) (2), Japanese

  • Pulsed ESR measurements of the radicals in solid SO_2
    Kanosue K., Tani A., Yamanaka C., Ikeya M.
    The Physical Society of Japan (JPS), 13 Sep. 1996, Abstracts of the meeting of the Physical Society of Japan. Sectional meeting, 1996(2) (2), 29 - 29, Japanese

  • 30a-N-3 Movement of the Nojima Fault Using Lattice Defects in Quartz
    Tani A., Yamanaka C., IkeYa M.
    The Physical Society of Japan (JPS), 12 Sep. 1995, Abstracts of the meeting of the Physical Society of Japan. Sectional meeting, 1995(2) (2), 72 - 72, Japanese

■ Books And Other Publications
  • 食品分野における微生物制御技術の最前線（川崎晋 監修）
    北野勝久, 井川聡, 谷篤史
    Contributor, 第3編 第3章 プラズマジェットを用いた液中殺菌技術, CMC出版, Dec. 2014

  • 非在来型天然ガスのすべて: エネルギー資源の新たな主役（コールベッドメタン・シェールガス・メタンハイドレート）（日本エネルギー学会 天然ガス部会 編）
    佐藤幹夫, 谷篤史
    Contributor, 第1章 1.4.5 メタンハイドレートの資源量, 第4章 4.2.3 メタンハイドレートの資源量試算, 日本工業出版, May 2014

  • 新版 雪氷辞典（日本雪氷学会 編）
    谷 篤史
    Contributor, 用語執筆（12項目）, 古今書院, Mar. 2014

  • 大気圧プラズマの技術とプロセス開発（沖野晃俊 監修）
    北野勝久, 井川聡, 谷篤史
    Contributor, 第V編 第2章 プラズマ医療のための大気圧低温プラズマを用いた液体の効果的殺菌技術, CMC出版, Aug. 2011

  • 環境考古学ハンドブック（安田喜憲 編）
    池谷元伺, 谷篤史
    Contributor, 第II編 3. 放射線効果年代測定, 朝倉書店, Jan. 2004

  • 物理学実験〜大阪大学理学部物理学科・物理学実験テキスト〜（杉山清寛, 福田光順, 山中千博, 下田正 編）
    谷篤史, 橋爪光
    Contributor, 第8章 高温・熱技術, 大阪大学出版会, Apr. 2003

  • Proceedings of the International Symposium on New Prospects of ESR Dosimetry and Dating
    Neil Evan Whitehead, Makoto Hirai, Atsushi Tani, Chihiro Yamanaka, Motoji Ikeya
    Editor, The Society of ESR Applied Metrology, Sep. 2002

■ Lectures, oral presentations, etc.
  • 潜熱蓄熱材料としての四級ホスホニウム塩型準包接水和物の設計と機能
    東さくら, 綱島克彦, 嶋田仁, 菅原武, 谷篤史
    第12回高専-TUT太陽電池合同シンポジウム, Dec. 2022, Japanese
    Poster presentation

  • Behavior of radical species in isoproplyamine silica clathrate
    Shusuke Isogai, Nobuyuki Tamai, Yuka Yokoyama, Atsushi Tani
    The 39th Workshop on ESR Applied Metrology, Dec. 2022, Japanese
    Oral presentation

  • Application of ESR thermochronology for mountains in Japan: an assessment of ESR signal variation caused by sample preparation
    Yuya Kajita, Shigeru Sueoka, Atsushi Tani, Shusuke Isogai, Takahiro Tagami
    The 39th Workshop on ESR Applied Metrology, Dec. 2022, Japanese
    Oral presentation

  • Effects of hydrocarbon chains in the quaternary phosphonium cations on the thermophysical properties of semiclathrate hydrates
    Jin SHIMADA, Sakura AZUMA, Takeshi SUGAHARA, Katsuhiko TSUNASHIMA, Atsushi TANI, Takayuki HIRAI
    The 43nd Japan Symposium on Thermophysical Properties, Oct. 2022, Japanese
    Oral presentation

  • Estimation of ESR age of chibaite using organic radicals
    Shusuke Isogai, Yuka Yokoyama, Kenta Kusuki, Hirotsugu Nishido, Atsushi Tani
    6th Asia Pacific Conference on Luminescence and Electron Spin Resonance Dating (APLED2022), Sep. 2022, English
    Poster presentation

  • Investigation on radiation-induced radicalsin primary alkylamines in silica clathrates
    Nobuyuki Tamai, Shusuke Isogai, Yuka Yokoyama, Atsushi Tani
    6th Asia Pacific Conference on Luminescence and Electron Spin Resonance Dating (APLED2022), Sep. 2022, English
    Poster presentation

  • Effects of hydrocarbon chains in quaternary phosphonium cations on thermodynamic properties of semiclathrate hydrates
    Jin Shimada, Sakura Azuma, Katsuhiko Tsunashima, Takeshi Sugahara, Atsushi Tani, Takayuki Hirai
    SCEJ 53rd Autumn Meeting, Sep. 2022, Japanese
    Oral presentation

  • Latent heat storage properties of semiclathrate hydrates including quaternary phosphonium cations with carbon-carbon double bond
    Jin SHIMADA, Sakura AZUMA, Katsuhiko TSUNASHIMA, Takeshi SUGAHARA, Atsushi TANI, Takayuki HIRAI
    31st Annual Meeting of the Japan Institute of Energy, Aug. 2022, Japanese
    Poster presentation

  • Low frequency Raman spectroscopy of quaternary onium salt hydrates
    三輪 泰大, 嶋田 仁, 長濱 朋輝, 佐藤 春実, 竹家 啓, 谷 篤史
    Frontier workshop for young students of Kobe university 2019, Dec. 2019, Japanese
    Poster presentation

  • Comparison of low frequency vibration modes and crystal structures in semiclathrate hydrates
    嶋田 仁, 三輪 泰大, 綱島 克彦, 菅原 武, 谷 篤史
    Frontier workshop for young students of Kobe university 2019, Dec. 2019, Japanese
    Poster presentation

  • Isotopic fractionation of methane with clathrate hydrate formation under the condition of ice crust/internal ocean boundary in Enceladus and Europe
    Kushi Kudo, Atsushi Tani, Naohiro Yoshida, Makoto Nagasawa
    AGU Fall Meeting 2019, Dec. 2019, English
    Poster presentation

  • Effects of phosphonium cation on equilibrium temperature and latent heat of semiclathrate hydrates
    嶋田 仁, 嶋田 大海, 菅原 武, 綱島 克彦, 谷 篤史
    第9回潜熱工学シンポジウム, Dec. 2019, Japanese
    Oral presentation

  • TBABセミクラスレートハイドレート26水和物における固相転移の分光観察
    須山 充, 秋田 雄賀, 谷 篤史
    H2Oを科学する2019, Dec. 2019, Japanese
    Poster presentation

  • A change of low-temperature ESR spectra observed in gamma-irradiated chibaite
    横山 優花, 磯谷 舟佑, 西戸 裕嗣, 谷 篤史
    ESR応用計測研究会・ルミネッセンス年代測定研究会・フィッショントラック研究会 2019年度合同研究会, Nov. 2019, Japanese
    Oral presentation

  • ESR study on thermal stability of radical species in chibaite
    磯谷 舟佑, 横山 優花, 西戸 裕嗣, 谷 篤史
    ESR応用計測研究会・ルミネッセンス年代測定研究会・フィッショントラック研究会 2019年度合同研究会, Nov. 2019, Japanese
    Oral presentation

  • Phase Equilibrium Behavior of Bromide Semiclathrate Hydrates with Different Alkyl Chains of Phosphonium Cations
    嶋田 仁, 嶋田 大海, 菅原 武, 綱島 克彦, 谷 篤史
    第29回日本MRS年次大会, Nov. 2019, Japanese
    Oral presentation

  • Physicochemical properties of semiclathrate hydrate enclathrating tributylalkylphosphonium cations
    嶋田 仁, 三輪 泰大, 嶋田 大海, 菅原 武, 綱島 克彦, 佐藤 春実, 谷 篤史
    第10回イオン液体討論会, Nov. 2019, Japanese
    Poster presentation

  • Assessing the influence of intermolecular interactions of guest molecules in TBA / TBP hydrate by low frequency Raman spectroscopy
    三輪 泰大, 嶋田 仁, 長濱 朋輝, 佐藤 春実, 竹家 啓, 谷 篤史
    第10回イオン液体討論会, Nov. 2019, Japanese
    Oral presentation

  • エンケラドス，エウロパの氷地殻-内部海界面の条件を模したクラスレートハイドレート生成実験およびゲストガスの同位体測定の手法
    工藤 久志, 谷 篤史, 永澤 真, 山田 桂太, 吉田 尚弘
    2019年度日本地球化学会第66回年会, Sep. 2019, Japanese
    Oral presentation

  • セミクラスレートハイドレートの熱物性に及ぼすカチオン構造の影響
    嶋田 仁, 嶋田 大海, 菅原 武, 谷 篤史, 綱島 克彦
    第28回日本エネルギー学会大会, Aug. 2019, Japanese
    Poster presentation

  • トリフルオロカルボン酸アニオンがセミクラスレートハイドレートに及ぼす影響
    嶋田 大海, 嶋田 仁, 菅原 武, 綱島 克彦, 谷 篤史, 鶴我佳代子, 青山千春
    第28回日本エネルギー学会大会, Aug. 2019, Japanese
    Poster presentation

  • 低波数Raman分光法を用いたTBA/TBP bromideハイドレートのゲスト分子相互作用の差異
    三輪 泰大, 嶋田 仁, 長濱 朋輝, 佐藤 春実, 竹家 啓, 谷 篤史
    第28回日本エネルギー学会大会, Aug. 2019, Japanese

  • TBAB 26H2O内で生成する物質の成長過程に対するTBAB水溶液の濃度の影響
    秋田 雄賀, 須山 充, 谷 篤史
    第28回日本エネルギー学会大会, Aug. 2019, Japanese
    Oral presentation

  • Peroxynitric acid (HOONO2) chemistry inside plasma-treated water (PTW) for effective and safety disinfection
    Katsuhisa Kitano, Satoshi Ikawa, Yoichi Nakashima, Takashi Yokoyama, Yusuke Kawashima, Atsushi Tani
    24th International Symposium on Plasma Chemistry, Jun. 2019, English
    Oral presentation

  • Inclusion of brine into icy shell of Enceladus
    西谷 隆介, 谷 篤史, 佐々木 晶, 木村 淳
    日本地球惑星科学連合2019年大会, May 2019, Japanese
    Poster presentation

  • 氷衛星における氷地殻底部環境を模擬したガスハイドレート生成観察装置の開発（２）
    谷 篤史, 森山 謙志郎
    日本地球惑星科学連合2019年大会, May 2019, Japanese
    Poster presentation

  • 冥王星の不思議を解く内部構造モデル
    鎌田 俊一, Nimmo Francis, 関根 康人, 倉本 圭, 野口 直樹, 木村 淳, 谷 篤史
    日本地球惑星科学連合2019年大会, May 2019, Japanese
    [Invited]
    Invited oral presentation

  • 氷衛星・氷惑星環境を模したガスハイドレート試料の同位体測定：装置開発および測定法の検討
    工藤 久志, 谷 篤史, 吉田 尚弘
    日本地球惑星科学連合2019年大会, May 2019

  • Peroxynitric acid (HOONO2) preserved in plasma-treated water for effective and safe disinfection
    Katsuhisa Kitano, Satoshi Ikawa, Yoichi Nakashima, Atsushi Tani
    8th Central European Symposium on Plasma Chemistry, May 2019, English
    [Invited]
    Invited oral presentation

  • 大阪湾の海底に見られるサンドウェーブの移動
    小島 響, 松野 哲男, 佐野 守, 島 伸和, 遠藤 徳孝, 大串 健一, 谷 篤史
    日本地球惑星科学連合2019年大会, May 2019, Japanese
    Oral presentation

  • Peroxynitric acid (HOONO2) is the most valuable chemical species in plasma-treated water for effective and safe disinfection
    KITANO Katsuhisa, IKAWA Satoshi, NAKASHIMA Yoichi, TANI Atsushi
    7th International Conference on Advanced Plasma Technologies (ICAPT7), Feb. 2019, English, International conference
    [Invited]
    Invited oral presentation

  • 大阪湾の海底に見られるサンドウェーブの形成と移動：直近1年の沖の瀬の砂の移動のダイナミクス
    KOJIMA Hibiki, MATSUNO Tetsuo, SANO Mamoru, SEAMA Nobukazu, ENDO Noritaka, OHKUSHI Kenichi, TANI Atsushi
    第4回海洋環境研究集会, Dec. 2018, Japanese, Domestic conference
    Oral presentation

  • Application of peroxynitric acid in plasma-treated water for safe and effective disinfection
    KITANO Katsuhisa, IKAWA Satoshi, NAKASHIMA Yoichi, OHSHIMA Tomoko, TANI Atsushi
    第28回日本MRS年次大会, Dec. 2018, Japanese, Domestic conference
    Oral presentation

  • Study of Tetrabutylammonium Bromide Hydrate by Two spectroscopies in THz region
    Yasuhiro Miwa, Tomoki Nagahama, Keisuke Matsumura, SATO HARUMI, Kei Takeya, Atsushi Tani
    The 3rd Aquaphotomics International Symposium, Dec. 2018, English, 淡路夢舞台, International conference
    Poster presentation

  • 電子スピン共鳴法を用いたプラズマにより水中に誘起される活性種の診断
    TANI Atsushi, IKAWA Satoshi, KITANO Katsuhisa
    平成30年度電気学会北陸支部シンポジウム「プラズマが誘起する液中化学反応診断の最前線」, Nov. 2018, Japanese, Domestic conference
    [Invited]
    Invited oral presentation

  • Formation and movement of sand wave in Osaka Bay
    KOJIMA Hibiki, MATSUNO Tetsuo, SANO Mamoru, SEAMA Nobukazu, ENDO Noritaka, OHKUSHI Kenichi, TANI Atsushi
    第35回ESR応用計測研究会,2018年度ルミネッセンス年代測定研究会,第43回フィッション・トラック研究会 合同研究会, Nov. 2018, Japanese, Domestic conference
    Oral presentation

  • Electron spin resonance study on radical species in chibaite
    KUSUKI Kenta, NISHIDO Hirotsugu, TANI Atsushi
    第35回ESR応用計測研究会,2018年度ルミネッセンス年代測定研究会,第43回フィッション・トラック研究会 合同研究会, Nov. 2018, Japanese, Domestic conference
    Oral presentation

  • 過硝酸溶液を利用した世界初の殺菌手法
    KITANO Katsuhisa, IKAWA Satoshi, NAKASHIMA Yoichi, TANI Atsushi
    日本防菌防黴学会 第45回年次大会, Nov. 2018, Japanese, Domestic conference
    [Invited]
    Invited oral presentation

  • ESR measurements of TBAB hydrate including hydrogen peroxide
    MIWA Yasuhiro, TANI Atsushi
    第35回ESR応用計測研究会,2018年度ルミネッセンス年代測定研究会,第43回フィッション・トラック研究会 合同研究会, Nov. 2018, Japanese, Domestic conference
    Oral presentation

  • Chemical kinetics of the sterilization by peroxynitric acid (HOONO2) in plasma-treated water
    KITANO Katsuhisa, IKAWA Satoshi, NAKASHIMA Yoichi, KAWASHIMA Yusuke, YOKOYAMA Takashi, Yokoyama, TANI Atsushi
    71st Annual Gaseous Electronics Conference (GEC18), Nov. 2018, English, International conference
    Oral presentation

  • 反応場としてのメタンハイドレート：メタンハイドレートからメタノールを作る！
    TANI Atsushi
    第8回CSJ化学フェスタ2018, Oct. 2018, Japanese, Domestic conference
    [Invited]
    Invited oral presentation

  • THz-TDS study on tetrabutylammonium bromide hydrate
    MIWA Yasuhiro, MATSUMURA Keisuke, TAKEYA Kei, TANI Atsushi
    43rd International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz2018), Sep. 2018, English, International conference
    Poster presentation

  • TBAB hydrate formed from TBAB•26H2O semiclathrate crystal
    SUYAMA Mitsuru, MIWA Yasuhiro, TANI Atsushi
    第27回日本エネルギー学会大会, Aug. 2018, Japanese, Domestic conference
    Oral presentation

  • Observation of THz-Raman Spectrum in Tetrabutylammonium Bromide Hydrate
    Yasuhiro Miwa, Tomoki Nagahama, SATO HARUMI, Kei Takeya, Atsushi Tani
    the 26th International Conference on Raman Spectroscopy, Aug. 2018, English, Jeju Island, Korea, International conference
    Poster presentation

  • Observation of THz- Raman Spectrum in Tetrabutylammonium Bromide Hydrate
    Yasuhiro Miwa, Tomoki Nagahama, SATO HARUMI, Kei Takeya, Atsushi Tani
    ICAMS, Jun. 2018, English, Kwansei Gakuin Kaikan, Nishinomiya, International conference
    Poster presentation

  • Bactericidal property of peroxynitric acid (HOONO2) in cryo-preserved plasma-treated water with reduced-pH method for effective and safety disinfection
    KITANO Katsuhisa, IKAWA Satoshi, NAKASHIMA Yoichi, KAWASHIMA Yusuke, TANI Atsushi
    7th International Conference on Plasma Medicine (ICPM7), Jun. 2018, English, International conference
    Oral presentation

  • Development of observation system of gas hydrate forming in the environment simulated near the bottom of icy shell in icy satellites
    TANI Atsushi, SUYAMA Mitsuru, NISHITANI Ryusuke
    Japan Geoscience Union Meeting 2018, May 2018, Japanese, Domestic conference
    Oral presentation

  • Inclusion of ammonium ion into clathrate hydrate in subsurface ocean of icy moons
    NISHITANI Ryusuke, TANI Atsushi, SASAKI Sho, KIMURA Jun
    14th International Conference on the Physics and Chemistry of Ice, Jan. 2018, English, Zürich, Switzerland, International conference
    Poster presentation

  • Smart disinfection technique using peroxynitric acid (HOONO2) in cryo-preserved plasma-treated water with the reduced-pH method
    KITANO Katsuhisa, IKAWA Satoshi, NAKASHIMA Yoichi, TANI Atsushi, KAWASHITA Norihito, KAWASHIMA Yusuke, YOKOYAMA Takashi
    10th EU-Japan Joint Symposium on Plasma Processing, Dec. 2017, English, Okinawa, Japan, International conference
    [Invited]
    Invited oral presentation

  • Identification of key chemical component in PTW (plasma-treated water) for peroxynitric acid (HOONO2)
    KITANO Katsuhisa, IKAWA Satoshi, NAKASHIMA Yoichi, TANI Atsushi
    Plasma Conference 2017, Nov. 2017, Japanese, Himeji, Japan, Domestic conference
    Oral presentation

  • Production process of peroxynitric acid in PTW (plasma-treated-water)
    ENDO Yuma, KITANO Katsuhisa, IKAWA Satoshi, NAKASHIMA Yoichi, TANI Atsushi
    Plasma Conference 2017, Nov. 2017, Japanese, Himeji, Japan, Domestic conference
    Poster presentation

  • Inclusion of ammonium ions into clathrate hydrate in a subsurface ocean of icy moons
    NISHITANI Ryusuke, TANI Atsushi, SASAKI Sho, KIMURA Jun
    ILTS Symposium: H2O Science - 2017, Sep. 2017, Japanese, Sapporo, Japan, Domestic conference
    Oral presentation

  • 土星衛星エンセラダスのプリューム組成に対する氷・クラスレートハイドレート形成の影響
    NISHITANI Ryusuke, TANI Atsushi, SASAKI Sho, KIMURA Jun
    日本惑星科学会2017年秋季講演会, Sep. 2017, Japanese, Toyonaka Japan, Domestic conference
    Oral presentation

  • 過硝酸溶液を用いた新しい殺菌手法の提案
    KITANO Katsuhisa, IKAWA Satoshi, NAKASHIMA Yoichi, TANI Atsushi
    日本防菌防黴学会 第44回年次大会, Sep. 2017, Japanese, Toyonaka, Japan, Domestic conference
    Poster presentation

  • Production process of peroxynitric acid in plasma-treated water (PTW)
    KITANO Katsuhisa, IKAWA Satoshi, NAKASHIMA Yoichi, TANI Atsushi
    78th JSAP Autumn Meeting, 2017, Sep. 2017, Japanese, Fukuoka, Japan, Domestic conference
    Oral presentation

  • Water-tetrahydrofuran hydrate partition coefficient for ammonium ion
    NISHITANI Ryusuke, TANI Atsushi, SASAKI Sho
    26th Annual Meeting of the Japan Institute of Energy, Aug. 2017, Japanese, Nagoya, Japan, Domestic conference
    Oral presentation

  • Peroxynitric acid (HOONO2) is the active component in cryo-preserved plasma-treatedwater with the reduced-pH method for effective and safety disinfection
    KITANO Katsuhisa, IKAWA Satoshi, NAKASHIMA Yoichi, KAWASHITA Norihito, TANI Atsushi
    23rd International Symposium on Plasma Chemistry, Aug. 2017, Japanese, Montréal, Canada, International conference
    Oral presentation

  • The effect of clathrate formation on concentrations of ammonia and ammonium ion in a subsurface ocean of Enceladus
    NISHITANI Ryusuke, TANI Atsushi, SASAKI Sho, KIMURA Jun
    JpGU-AGU Joint Meeting 2017, May 2017, Japanese, Chiba, Japan, Domestic conference
    Poster presentation

■ Affiliated Academic Society
  • 第四紀学会

  • ESR応用計測研究会

■ Works
  • ハイドレートケージにおけるゲスト物質の滞留と拡散に関する研究
    2010

  • 固体高分解能NMRおよびESR分光法による新しい文化財分析法の開発
    2004

  • マレー半島の鍾乳洞形成史の解明
    2000

  • History of Caves in Peninsula Malaysia
    2000

  • 貫入花こう岩の熱史と貫入速度の見積り
    1998

  • Thermal history of intrusive granite
    1998

■ Research Themes
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