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SUZUKI NozomuGraduate School of Engineering / Department of Chemical Science and EngineeringAssociate Professor
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■ Award- Mar. 2016 奈良先端科学技術大学院大学, Best Student Award
- Jan. 2013 GIST-NCTU-NAIST, GIST-NCTU-NAIST Joint Symposium Student Award
- May 2012 International Association of Colloid and Interface Scientists, International Association of Colloid and Interface Scientists Poster Award
- Mar. 2011 International Christian University, ICU Undergraduate Science Award
- American Chemical Society (ACS), 2025, The Journal of Physical Chemistry B[Refereed]Scientific journal
- Abstract Single hollow particles are used in various fields, particularly in thermal insulation materials, owing to their low thermal conductivity attributed to encapsulated air properties. “The self‐assembling phase separated polymer (SaPSeP) method” is an original hollowing method that is proposed by this laboratory 25 years ago. Most hollow particles prepared by the SaPSeP method have carbon, oxygen, and hydrogen polymer shells, which lack sufficient heat resistance. In this study, hollow particles with a silicone shell, which is highly heat‐resistant, are prepared using the SaPSeP method using a trimer of 3‐methacryloxypropylmethyldimethoxysilane (MPDS). The MPDS trimer (3MPDS) is synthesized through the sol–gel reaction of MPDS with a basic aqueous solution. Additionally, hollow particles are prepared using a new silicone oligomer composed of MPDS and dimethoxymethylvinylsilane (DMVS). Both hollow particles prepared from 3MPDS and from a new silicone oligomer composed of MPDS and DMVS showed high heat resistance. They maintained their hollow structure even when exposed to temperatures up to 900 °C.Wiley, 2024, Macromol. React. Eng., 19(1) (1), 2400046[Refereed]Scientific journal
- Abstract Micrometer-sized, monodispersed silicone hollow particles are functional materials with properties attributed to both their hollow structure and the silicone composition. However, there are few reports on their preparation. We have successfully prepared these particles by combining an original suspension polymerization technique, the self-assembling phase-separated polymer method, with a molecular diffusion method. The resulting particles exhibit heat resistance owing to the silicone matrix and maintain their hollow structure even after heating to 900 °C.Oxford University Press (OUP), 2024, Chem. Lett., 54(1) (1), upae249Scientific journal
- American Chemical Society (ACS), 2024, ACS Appl. Mater. Interfaces., 16(46) (46), 64058 - 64064[Refereed]Scientific journal
- Abstract An efficient strategy for high‐performance chiral materials is to design and synthesize host molecules with left‐ and right‐ (M‐ and P‐)twisted conformations and to control their twisted conformations. For this, a quantitative analysis is required to describe the chiroptical inversion, chiral transfer, and chiral recognition in the host‐guest systems, which is generally performed using circular dichroism (CD) and/or proton nuclear magnetic resonance (1H NMR) spectroscopies. However, the mass‐balance model that considers the M‐ and P‐twisted conformations has not yet been established. In this study, we derived the novel equations based on the mass‐balance model for the 1 : 1 host‐guest systems. Then, we further applied them to analyze the 1 : 1 host‐guest systems for the achiral calixarene‐based capsule molecule, achiral dimeric zinc porphyrin tweezer molecule, and chiral pillar[5]arene with the chiral and/or achiral guest molecules by using the data obtained from the CD titration, variable temperature CD (VT−CD), and 1H NMR experiments. The thermodynamic parameters (ΔH and ΔS), equilibrium constants (K), and molar CD (Δϵ) in the 1 : 1 host‐guest systems could be successfully determined by the theoretical analyses using the derived equations.Wiley, 2024, Angew. Chem., Int. Ed., 64(1) (1), e202413340Scientific journal
- Circular dichroism (CD) studies on poly(1,4‐phenylene)s bearing a chiral side chain in the aggregated conditions were carried out. Little CD was observed in a solution form, while addition of a poor solvent into the polyphenylene solution induced aggregation and a strong CD was observed, accordingly. Applying the controlled degree of polymerization (DP) of poly(1,4‐phenylene) in the use of bidentate diphosphine Chiraphos as a ligand for the nickel catalyst, the relationship of DP with CD strength was studied to reveal to show the highest CD at the DP = 84 (gabs = ca. 2 x 10–2). It was also found that the related aggregation was observed in good solvent 1,2‐dichloroethane upon standing the solution at 4 °C for 3–23 days to observe gabs = ca. 10–1. Studies on the substituent effect of poly(1,4‐phenylene) suggested that CD behaviors were dependent on the type of non‐chiral substituent on the aromatic ring as well as the side‐chain chirality.Wiley, 2024, Chem. Eur. J., 30(35) (35), e202400706[Refereed]Scientific journal
- 2024, AppliedChem, 4(1) (1), 1 - 14, English[Refereed][Invited]Scientific journal
- Abstract Hollow polyimide (PI) particles were successfully prepared using chemical imidization with acetic anhydride and pyridine as the chemical imidization reagents. The imidization reagents were added to the dispersion in which N,N-dimethylformamide (DMF) droplets with dissolved poly(amic acid) (PAmA, the precursor of PI) were dispersed in a cyclohexane medium. In the absence of poly(n-butyl methacrylate) (P[n-BMA]) in PAmA/DMF droplets, approximately 10% of the PI particles had hollow structures. Conversely, in the presence of a small amount of P(n-BMA) in PAmA/DMF droplets (0.2∼1 wt%), all PI particles had hollow structures. The P(n-BMA) would affect the phase separation of the PI in the droplets, thereby promoting the formation of a hollow structure.Oxford University Press (OUP), 2023, Chem. Lett., 53(2) (2)[Refereed]Scientific journal
- American Chemical Society (ACS), 2023, J. Am. Chem. Soc., 145(45) (45), 24862 - 24876, English[Refereed]Scientific journal
- We report covalently patterned graphene with acetic acid as a new potential candidate for graphene-enhanced Raman scattering (GERS). Rhodamine 6G molecule in direct contact with the covalently modified region shows...Royal Society of Chemistry (RSC), 2023, Chem. Commun., 59, 11417 - 11420[Refereed]Scientific journal
- Abstract A series of poly(biarylylacetylene)s (PBAs) bearing axially‐chiral (S)‐and (R)‐pyridyl‐N‐oxide residues with a methoxy, propoxy, or acetyloxy substituent at the 3‐position of the biaryl units was synthesized. All the PBAs formed a preferred‐handed helix, while the helical sense preference was varied depending on the substituents despite the same twist‐sense of the biaryl units. Among them, the propoxy‐bound helical PBA showed an exceptionally high chiral recognition ability as a chiral stationary phase (CSP) for high‐performance liquid chromatography (HPLC) and efficiently resolved not only various chiral aromatic alcohols, but also a variety of chiral aliphatic alcohols; the latter still remains difficult to resolve by commercially‐available CSPs in HPLC. Such practically‐useful both handed helical PBA‐based CSPs can be produced from the racemic PBA composed of fully racemic monomer units through deracemization of the biaryl units with a chiral alcohol.Wiley, 2023, Angew. Chem., Int. Ed., 62(31) (31), English[Refereed]Scientific journal
- Graphene is covalently modified in the aqueous solution of short-chain fatty acids (SCFAs) under laser irradiation. Raman and infrared spectroscopy reveal the efficient introduction of functional groups on graphene.Royal Society of Chemistry (RSC), 2023, Nanoscale, 15(10) (10), 4932 - 4939[Refereed]Scientific journal
- Elsevier BV, 2023, J. Mol. Liq., 376, 121383[Refereed]Scientific journal
- Elsevier BV, 2022, J. Mol. Liq., 367, 120597[Refereed]Scientific journal
- Elsevier BV, 2022, J. Colloid Interface Sci., 627, 578 - 586[Refereed]Scientific journal
- American Chemical Society (ACS), 2022, J. Am. Chem. Soc., 144(6) (6), 2775 - 2792[Refereed]Scientific journal
- American Chemical Society (ACS), 2021, J. Am. Chem. Soc., 143(32) (32), 12725 - 12735[Refereed]Scientific journal
- Wiley, 2021, Chem. Asian J., 16(7) (7), 769 - 774[Refereed]Scientific journal
- Springer Science and Business Media LLC, 2021, Sci. Rep., 11(1) (1), 790
Abstract The elastic responsiveness of single cellulose nanofibres is important for advanced analysis of biological tissues and their use in sophisticated functional materials. However, the mechanical responsiveness derived from the twisted structure of cellulose nanofibres (CNFs) has remained unexplored. In this study, finite element simulations were applied to characterize the deformation response derived from the torsional structure by performing tensile and bending tests of an unconventionally very long and twisted rod model, having the known dimensional parameters and properties of CNFs. The antagonistic action of two types of structural elements (a contour twist and a curvilinear coordinate) was found to result in an irregular deformation response but with only small fluctuations. The contour twist generated rotational displacements under tensile load, but the curvilinear coordinate suppressed rotational displacement. Under bending stress, the contour twist minimized irregular bending deformation because of the orthotropic properties and made the bending stress transferability a highly linear response.[Refereed]Scientific journal - A review. The question of homochirality is an intriguing problem in the field of chemistry, and is deeply related to the origin of life. Though amphiphiles and their supramolecular assembly have attracted less attention compared to biomacromolecules such as RNA and proteins, the lipid world hypothesis sheds new light on the origin of life. This review describes how amphiphilic molecules are possibly involved in the scenario of homochirality. Some prebiotic conditions relevant to amphiphilic molecules will also be described. It could be said that the chiral properties of amphiphilic molecules have various interesting features such as compositional information, spontaneous formation, the ability to exchange components, fission and fusion, adsorption, and permeation. This review aims to clarify the roles of amphiphiles regarding homochirality, and to determine what kinds of physical properties of amphiphilic molecules could have played a role in the scenario of homochirality.2019, Symmetry, 11(8) (8), 966, English[Refereed][Invited]Scientific journal
- Moment equations were developed for quantitatively studying the separation characteristics of micellar electrokinetic chromatography (MEKC). They explain how the first absolute and second central moments of elution peaks are correlated with some fundamental parameters of the partition equilibrium and mass transfer kinetics in MEKC systems. In order to discuss the influence of the mass transfer kinetics on peak broadening, the moment equations were used to analyze the separation behavior in MEKC systems. Separation conditions were chosen on the basis of practical MEKC experiments previously conducted. It was quantitatively clarified that both the solute permeation at the interfacial boundary of surfactant micelles and axial diffusion of solute molecules in a capillary had a predominant contribution to the spreading of the elution peaks in MEKC systems. This is a preliminary study for the analytical determination of rate constants concerning solute permeation at the interface of surfactant micelles from elution peak profiles measured by MEKC. In addition, it was also indicated that the experimental conditions of MEKC systems could be controlled so that the interfacial solute permeation would have a predominant role for the band broadening. For example, the contribution of the interfacial permeation was about 33 times larger than that of the axial diffusion of solute molecules under the MEKC conditions in a previous study. This means that the rate constants could appropriately be determined for the interfacial solute permeation.Japan Society for Analytical Chemistry, 2018, Anal. Sci., 34(2) (2), 215 - 220, English[Refereed]Scientific journal
- We investigated whether helicity and/or chirality of cellulose tris(phenylcarbamate) (CTPC) can transfer to noncharged, nonhelical oligo- and polyfluorenes when CTPC was employed as a solution processable homochiral platform of a D-glucose-skeletal polymer. Noticeably, CTPC revealed the solvent-driven, ambidextrous intermolecular helicity/chirality transfer capability to these fluorenes. The chiroptical inversion characteristics of circularly polarized luminescence (CPL) and the corresponding CD spectra were realized by solely choosing a proper achiral solvent and/or achiral cosolvent. When the solution of PF6 and CTPC in tetrahydrofuran (THF) was cast on a quartz substrate, the dissymmetry ratio of CPL (gCPL) from the polymer film showed gCPL = +2.1 × 10-3 at 429 nm. Conversely, when dichloromethane (DCM) was used as the solvent, the CPL sign was inverted to gCPL = -2.4 × 10-3 at 429 nm. The dissymmetry ratio of Cotton CD band (gCD) from the THF solution was gCD = +3.2 × 10-3 at 392 nm conversely, from the DCM, the CD sign inverted to gCD = -0.8 × 10-3 at 371 nm. The sign and magnitude of the gCD values were interpreted to a London dispersion term (δd) of Hansen solubility parameter (δ) of the casting solvents rather than a dipole-dipole interaction term (δp) and a hydrogen bonding interaction term (δh) of the δ values and dielectric constant (ϵ). Analysis of solvent-driven changes in FTIR spectra, wide-angle X-ray diffraction profiles, and differential scanning calorimetry diagrams indicated that solvent driven on-off switching of multiple hydrogen bonds due to three urethane groups of CTPC play the key for the inversion. Intermolecular CH/π and π- π interactions among phenyl rings and alkyl groups were assumed to be crucial for helicity/chirality transfer capability based on molecular mechanics and molecular dynamics simulations of PF6-CTPC hybrids. These chiroptical inversion characteristics arose from solvent-driven order-disorder transition characteristics of the CTPC helix rather than a helix-helix transition of CTPC itself.American Chemical Society, 2018, Biomacromolecules, 19(2) (2), 449 - 459, English[Refereed]Scientific journal
- To understand how polymers physisorb onto solid surfaces, we investigated the physisorption behavior of non-charged, semiflexible poly(9,9-dioctylfluorene) (PF8) with three different number-average degrees of polymerization (DPn) as photoluminescent and chromophoric probes onto cuboidal γ-alumina in toluene at 5, 25, and 50 °C. PF8 revealed noticeable DPn and temperature dependencies in its physisorption behaviors. Molecular mechanics (MM)/molecular dynamics (MD) simulations [consistent valence force field (CVFF)] and Møller–Plesset second-order perturbation theory (MP2) with 6-31 G(d,p) calculations suggested that the PF8 in toluene has multiple interactions from CH/π to C–H/O interactions on the (110) surface of γ-alumina. The competition between multiple intermolecular CH/π and C–H/O interactions was crucial for the spontaneous physisorption of PF8 to occur in the presence of a solvent quantity of toluene. Calculations by time-dependent density functional theory (TD-DFT) with Becke three parameter Lee-Yang-Par (B3LYP) method and 6–31 G(d,p) basis set of a model fluorene 9-mer indicated that the π–π* absorption wavelength largely depends on the regularity of the dihedral angles between fluorene rings, while the intensity and spectral width of the π–π* absorption band are largely influenced by the regularity of the dihedral angles. Solution-phase physisorption systems are a result of the inherent nature of several competitive weak intermolecular interactions coexisting among the polymers, surface, and solvents.Nature Publishing Group, 2018, Polym. J., 50, 865 - 877, English[Refereed]Scientific journal
- Capillary electrophoresis is a method for analyzing intermolecular interactions that does not require immobilization of molecules to a solid surface or introduction of a luminescent moiety. Recently, an advanced method, moment analysis based on affinity capillary electrophoresis (MA-ACE), was developed. This method can determine not only the equilibrium constant but also the rate constants of an intermolecular interaction. Through MA-ACE, it became possible to theoretically predict an increase in the variance of an observed peak caused by intermolecular interaction. In this study, we confirm the prediction and determine the kinetic constants by using MA-ACE to analyze an intermolecular interaction between cyclodextrin and phenoxypropionic acid. A numerical calculation is performed to confirm that the derived rate constants by MA-ACE are appropriate.American Chemical Society, 2018, Anal. Chem., 90(18) (18), 11048 - 11053, English[Refereed]Scientific journal
- Detecting chiral/helical interactions among noncharged molecules and polymers is difficult due to their unlimited intra- and intermolecular rotational freedom. To clarify the chirality and/or helicity transfer from a chiral polymer to noncharged achiral molecules, we chose stiff cellulose triacetate (CTA) and cellulose acetate butyrate (CABu) as nonchromophoric helical/chiral polymers. Here, we highlighted stiff 9,9-dialkylfluorene oligomers arid polymers (repeating number n = 1, 2, 3, 5, 7, 47, 201) as achiral chromophoric luminophores. These fluorenes revealed clear circularly polarized luminescence (CPL) and bisignate circular dichroism (CD) signals when embedded into CTA and CABu films. In the ground state, when n = 1-7, CTA and CABu commonly induced (+)-CD signals, whereas when n >= 47, they induced (+)- and (-)-CD signs, respectively. In the photoexcited state, when n >= 3, CTA and CABu induced (+)- and(-)-CPL signs, respectively. Upon comparing the ground and photoexcited states, when n = 2-7, CABu induced (+)-CD and (-)-CPL signs, whereas when n >= 3, CTA induced the same (+)-CD and (+)-CPL signs. A conflict between the D-glucose chirality and main-chain helicity was assumed to be responsible for these anomalies because CTA and CABu, despite being common frameworks of beta(1 -> 4)-linked D-glucose residues, prefer left- and right-handed helicities, respectively. Molecular mechanics/molecular dynamics simulations suggested intermolecular C-H/O=C interactions between H-C (due to the methylene group of the dioctylfluorenes) and O=C (due to the acetyl group attached to the D-glucose of CTA). This simulation was confirmed by the first detection of a clear cross-peak at C-13=O (delta c = 170.6 ppm, CTA) and the finding CH2 protons (delta(H) = 2.55 ppm, fluorene with n = 201) represented the shortest C-H-1/O=C-13 distance according to the phase-modulated Lee- Goldburg homonuclear decoupling of solid-state H-1-C-13 HETCOR NMR spectroscopy. Moreover, the first photoinduced change in the real-time CPL/PL amplitude measurement of optically active fluorenes in CTA revealed that the stability of the chiroptical state increases as n increases and remains unchanged when n >= 47.AMER CHEMICAL SOC, 2017, MACROMOLECULES, 50(5) (5), 1778 - 1789, English[Refereed]Scientific journal
- Affinity capillary electrophoresis (ACE) has been widely applied to evaluate binding constants of various systems. Recently, moment equations were derived based on the moment analysis (MA) theory for describing the influence of reaction kinetics and longitudinal diffusion on the elution peak profiles measured by ACE (MA-ACE). The equations enable one to obtain not only the binding constants but also the reaction rate constants from the migration time and variance of elution peaks. However, it is necessary to consider other factors (e.g., sample injection, detector window, Joule heating, and ramp time of the voltage increase) to improve the accuracy of MA-ACE. The variance of these effects was quantified under typical experimental conditions. Such quantification clarified the process to obtain the rate constants. The best experimental conditions to achieve high accuracy were discussed.AMER CHEMICAL SOC, 2017, Anal. Chem., 89(19) (19), 10487 - 10495, English[Refereed]Scientific journal
- New moment equations were developed for size exclusion capillary electrochromatography (SECEC), in which intermolecular chemical reactions simultaneously took place. They explain how the first absolute and second central moments of elution peaks are correlated with some fundamental equilibrium and kinetic parameters of mass transfer and chemical reaction in SECEC column. In order to demonstrate the effectiveness of the moment equations, they were used to predict chromatographic behavior under hypothetical SECEC conditions. It was quantitatively studied how the association and dissociation rate constants of intermolecular interaction affected the position and spreading of elution peaks. It was indicated that both the intermolecular reaction kinetics and axial dispersion of solute molecules in a capillary column had a predominant contribution to the band broadening.JAPAN SOC ANALYTICAL CHEMISTRY, 2017, Anal. Sci., 33(10) (10), 1147 - 1154, English[Refereed]Scientific journal
- 2016, RSC Adv., 6(101) (101), 99172 - 99176[Refereed]
- Chiral nanostructures from metals and semiconductors attract wide interest as components for polarization-enabled optoelectronic devices. Similarly to other fields of nanotechnology, graphene-based materials can greatly enrich physical and chemical phenomena associated with optical and electronic properties of chiral nanostructures and facilitate their applications in biology as well as other areas. Here, we report that covalent attachment of L/D-cysteine moieties to the edges of graphene quantum dots (GQDs) leads to their helical buckling due to chiral interactions at the "crowded" edges. Circular dichroism (CD) spectra of the GQDs revealed bands at ca. 210-220 and 250-265 nm that changed their signs for different chirality of the cysteine edge ligands. The high-energy chiroptical peaks at 210-220 nm correspond to the hybridized molecular orbitals involving the chiral center of amino acids and atoms of graphene edges. Diverse experimental and modeling data, including density functional theory calculations of CD spectra with probabilistic distribution of GQD isomers, indicate that the band at 250-265 nm originates from the three-dimensional twisting of the graphene sheet and can be attributed to the chiral excitonic transitions. The positive and negative low-energy CD bands correspond to the left and right helicity of GQDs, respectively. Exposure of liver HepG2 cells to L/D-GQDs reveals their general biocompatibility and a noticeable difference in the toxicity of the stereoisomers. Molecular dynamics simulations demonstrated that D-GQDs have a stronger tendency to accumulate within the cellular membrane than L-GQDs. Emergence of nanoscale chirality in GQDs decorated with biomolecules is expected to be a general stereochemical phenomenon for flexible sheets of nanomaterials.Lead, AMER CHEMICAL SOC, 2016, ACS Nano, 10(2) (2), 1744 - 1755, English[Refereed]Scientific journal
- The circularly polarised luminescence and circular dichroism signs of the blue circularly polarised luminescence generated by two photoexcited pyrenes as puppets are controlled by the wire structure of the C-2-symmetric binaphthyl as puppeteer. The experimental results, though at variance with theoretical simulation, offer a rational design in the photoexcited and ground state chiralities of luminophores.WILEY-V C H VERLAG GMBH, 2016, Eur. J. Org. Chem., 2016(1) (1), 64 - 69, English[Refereed]Scientific journal
- The moment analysis (MA) theory was introduced into the analysis of elution peak profiles measured by affinity capillary electrophoresis (ACE). New moment equations were developed, which were essential for analytically determining the association (k(a)) and dissociation (k(d)) rate constants of intermolecular interactions from the ACE data. The combination of the MA theory and ACE procedure leads to a method for the kinetic study of intermolecular interactions (MA-ACE). Because ACE has quite frequently been used for determining binding (association equilibrium) constants of intermolecular interactions, it must be important that k(a) and k(d) can also be determined from ACE elution peaks. An attempt was made to analyze ACE elution peaks in a published paper by the MA method to determine the rate constants. The values of k(a) and k(d) were analytically determined for the intermolecular interaction between three boronic acids and fructose. They were comparable with those determined by the other method based on the macroscopic approach for studying kinetics at equilibrium. It was demonstrated that the MA method was effective for extracting information about affinity kinetics of intermolecular interactions from elution peaks measured by ACE. This means that the MA method makes it possible to use ACE data previously published as a source for kinetic study of intermolecular interactions.CHEMICAL SOC JAPAN, 2016, Bull. Chem. Soc. Jpn., 89(7) (7), 746 - 753, English[Refereed]Scientific journal
- We applied moment analysis (MA) with chromatographic capillary electrophoresis (CCE) to the analytical determination of rate constants (kin and kat) of solute permeation at the interface between a bulk solvent and surfactant micelles. CE experiments were carried out in the MEKC system using thymol and sodium dodecylsulfate (SDS) as the solute and surfactant, respectively, under CCE conditions. In CCE mode, experimental conditions are controlled so that the migration of micelles, which dissolve single or plural solute molecules, is stopped in the axial direction of a capillary. Only solute molecules migrate in the capillary and are detected to record elution peak profiles. The mass-transfer kinetics of solute molecules in the capillary are determined from the elution peak profiles by the MA theory. The values of k(in) and k(out) were respectively determined as 1.5 x 10(-6) and 2.6 x 10(-9)m s(-1) for the permeation of thymol molecules at the interfacial boundary of SDS micelle. It was demonstrated that MA-CCE was effective for the kinetic study of solute permeation across the interface between a bulk solvent and spherical molecular aggregates, e.g., surfactant micelles.CHEMICAL SOC JAPAN, 2016, Bull. Chem. Soc. Jpn., 89(10) (10), 1212 - 1218, English[Refereed]Scientific journal
- The combination of moment analysis (MA) theory with affinity capillary electrophoresis (ACE) leads to a new method (MA-ACE) for the kinetic study of intermolecular interaction. The reaction rate constants, i.e., association (k(a)) and dissociation (k(d)) rate constants, can be analytically determined by the MA theory from the first absolute and second central moments of the elution peaks measured by ACE. In order to verify the validity of the MA-ACE method, the values of ka and kd were analytically determined for the formation and dissociation of the inclusion complex between thymol and sulfated-beta-cyclodextrin. The resulting values of k(a) and k(d) were comparable with those in our previous study, which were determined by chromatographic capillary electrophoresis with the MA theory. It was demonstrated that the MA-ACE method was effective for the kinetic study of intermolecular interactions. The rate constants can be analytically determined with no immobilization and no chemical modification, i.e., fluorescence labelling, of solute and ligand molecules.CHEMICAL SOC JAPAN, 2016, BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN, 89(10) (10), 1219 - 1224, English[Refereed]Scientific journal
- American Chemical Society (ACS), 2016, Cryst. Growth Des., 16(11) (11), 6593 - 6599[Refereed]Scientific journal
- Herein, we designed photoluminescent polymer aggregates surrounded by organic media containing (S)-/(R)-limonene.and (1S)-/(1R)-alpha-pinene as an artificial model of an open-flow cell-wall free coacervate in a fluidic medium in the ground and photoexcited states. The aggregates were build-up of stiff circular dichroism (CD)-silent and circularly polarized luminescence (CPL)-silent bis(p-n-butylphenyl)polysilanes, nBuPS, and four other diarylpolysilanes. (S)- and (R)-limonene induced more efficiently to their chirality to nBuPS during aggregation, as proven by CD and CPL spectral analysis, compared to (1S)- and (1R)-alpha-pinene. The nBuPS aggregates generated in a mixture of limonene, methanol, and chloroform had a dissymmetry factor (g(abs)) as high as +0.04 for (R)-limonene and -0.03 for (S)-limonene at the first Cotton band and a weak dissymmetry factor (g(lum)) of +0.004 for (R)-limonene and -0.003 for (S)-limonene. The gabs factor, however, greatly depended on the volume fraction and chirality of limonene in the tersolvents. These behaviors were ascribed to the tempo-spatial stability and instability of the aggregates suspension in the fluidic media, as revealed by time-course dynamic light scattering measurement. (C) 2016 Elsevier B.V. All rights reserved.ELSEVIER SCIENCE SA, 2016, J. Photochem. Photobiol. A: Chem., 331, 120 - 129, English[Refereed][Invited]Scientific journal
- Circularly polarised (CP)-photons at six different energies (six wavelengths) were irradiated to non-photochromic, highly photoluminescent poly are tested for asymmetric polymerization in chiral monoterpenes used as solvents and compared with the corresponding monosubstituted acetylene monomer [1-phenylacetylene (PA-pC1)]. DPA-pC1 containing a trimethylsilyl group in the para-position of the phenyl ring produces an optically active polymer with a large Cotton effect, despite the absence of a stereogenic center. The polymer sample obtained by polymerization in 87% ee (-)-α-pinene shows the strongest CD signal (gCD value at 385 nm: ∼3.2 × 10-3). The Cotton bands of the polymers obtained in (-)- and (+)-α-pinenes show the opposite sign in the CD signals. Theoretical calculations show that only the cis-cisoid model adopts a helical conformation. A time-correlated single photon counting experiment shows that the emission of the chiral polymer originates from a virtually single excited species with a 98% component fraction. This polymer solution does not show any significant decrease in gCD value over a wide temperature range of 20 to 80 °C. No noticeable decrease in the g CD value is detected when the polymer solution is kept at relatively low temperatures for a prolonged period (35 d). In contrast, the other polymers show no CD signal. An optically active conjugated polymer with an asymmetric intramolecular π-stack structure, long-term helical stability, and a long-lived emission single excited species is obtained using solvent chirality transfer polymerization. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.American Chemical Society, 2013, Macromol. Rapid Commun., 34(18) (18), 1471 - 1479, English[Refereed]Scientific journal
- The chiroptical properties of two viscous chiral fluorophores, (R)-2,2'-hepthoxy-1,1'- binaphthyl [(R)-1] and its antipode [(S)- 1], dispersed in inorganic (KBr and KCl) and organic polymer ( PMMA and PS) matrices are studied in the photoexcited and ground states. Both (R)-1 and (S)-1 emit circularly polarised luminescence (CPL) with a high quantum efficiency in these solid matrices (15-58%) and in chloroform solution (14%).ROYAL SOC CHEMISTRY, 2013, RSC Adv., 3(45) (45), 23508 - 23513, English[Refereed]Scientific journal
- The first circularly polarised light (CPL)-pumped mirror symmetry breaking experiment with achiral fluorene-alt-azobenzene copolymer as polymer particles dispersed in optofluidic organic solvents was demonstrated. CPL-pumped chiroptical generation, racemisation, inversion and retention were effectively achieved by finely tuning the media and the wavelength, pumping time and ellipticity of the CPL. The absolute g(CD) value was approximate to 6 x 10(-2) for chloroform/n-pentanol and chloroform/i-propanol cosolvents. For comparison, neither the magnetochiral birefringence effect nor CPL-induced chirality in molecular particles of azobenzene was detected under similar conditions.ROYAL SOC CHEMISTRY, 2013, RSC Adv., 3(15) (15), 5213 - 5219, English[Refereed]Scientific journal
- Here we report the first chiral optofluidic system that enables the emergence and enhancement of chiroptical signals of mm-sized polymer particles from achiral all-trans-poly(9,9-di-n-octylfluorene-2,7-vinylene) (PFV) during mirror-symmetry-breaking aggregation due to the optically active fluidic media consisting of (R)-limonene (1R) and (S)-limonene (1S), chloroform and methanol. These results were proven by refractive index (RI) and specific rotation (SR) of the media as well as circular dichroism (CD), optical rotatory dispersion (ORD), circular polarised luminescence (CPL), UV-vis and photoluminescence spectral characteristics of PFV. For comparison, a triple bond linker poly[(9,9-di-n-octylfluoren-2,7-diyl)-alt-yleneethynylene] (PFE) aggregate, which is an analogue of PFV, did not show any CD-signals in the pi-pi* transition. Gaussian 03 (TD-DFT, B3LYP, 3-21G basis set) calculations of PFV and PFE trimer models suggested that PFV is CD-/CPL-silent helix due to an equal proportion of P-and M-helices in a double-well with a small barrier height, conversely, that PFE is inherently optically inactive due to non-helix conformation in a single-well. Under optimised chiral optofluid with specific RI values of 1.38-1.39, the mu m-sized PFV particles showed a great enhancement in Kuhn's dissymmetry amplitudes by similar to 1500 times compared to the computed value in helical models of PFV; the g(CD) at 473 nm reached +0.078 (1S) and -0.104 (1R), and the g(CPL) at 474 nm attained +0.056 (1S) and -0.077 (1R), while maintaining a high quantum yield (Phi(PL)) of 75-88% with a short PL lifetime of similar to 0.5 ns. For comparison, as for six p-conjugated molecular aggregates with/without H-H repulsions, including trans-stilbene and diphenylacetyelene, with the help of the 1R-/1S-based media, any detectable CD signals were not observed. These results led to the idea that optically active pi-conjugated polymers carrying longer alkyl side groups in a double-well potential may be needed to efficiently generate the corresponding optically active aggregates in the chiral tersolvents.ROYAL SOC CHEMISTRY, 2012, RSC Adv., 2(16) (16), 6663 - 6671, English[Refereed]Scientific journal
- Solvent-to-polymer chirality transfer was examined using conjugated polymer with intramolecular stack structure (IaSS). When achiral poly(diphenylacetylene)s (PDPAs) dissolved in limonene, the solvent chirality was successfully transferred to the side phenyl stack structure, leading to intramolecular axial chirality. The phenyl-phenyl IaSS was under thermodynamic control to readily undergo asymmetric changes in chiral limonene, leading to optical activity in the isotropic structure between the main chain and resonant side phenyl rings. The axial chirality was significantly affected by the chain length and substitution position of the side alkyl groups. The longer alkyl chains and bulkier alkyl group prevented direct intermolecular interactions between the side phenyl rings and the chiral limonene molecules. PDPA with sterically congested, highly stable, and regulated IaSS was not favorable for efficient solvent-to-polymer chirality transfer.AMER CHEMICAL SOC, 2012, Macromolecules, 45(13) (13), 5379 - 5386, English[Refereed]Scientific journal
- The side chain chirality of a poly(diphenylacetylene) derivative was transferred and amplified spontaneously from solution to a bulk film due to lyotropic liquid crystallinity.ROYAL SOC CHEMISTRY, 2012, Chem. Commun., 48(74) (74), 9275 - 9277, English[Refereed]Scientific journal
- Last, Mar. 2023, フォーラム理科教育, 24, 15 - 20木材の燃焼時間の密度依存性に着目した小学校理科教材開発[Refereed]
- 01 Sep. 2016, 基礎有機化学討論会要旨集, 27th, 244, Japaneseクリプトキラル型光学活性ビナフチル‐ピレン有機発光体の合成と円偏光発光(CPL)特性
- SPIE-Intl Soc Optical Eng, 13 Apr. 2016, SPIE Newsroom
- 31 Mar. 2016, EnglishSide Chain Length Dependent Chiroptical Switching in Si-Si Bond Polymer Aggregates
- 10 Mar. 2016, 日本化学会春季年会講演予稿集(CD-ROM), 96th, ROMBUNNO.4F3‐18, Japaneseクリプトキラル型光学活性ビナフチル‐ピレン有機発光体の合成と円偏光発光(CPL)特性
- 08 Sep. 2015, 光化学討論会講演要旨集, 2015(CD-ROM) (CD-ROM), ROMBUNNO.1P041, Japanese光学活性ビナフチル‐ピレン有機発光体の非古典的円偏光発光(CPL)特性制御
- 12 Mar. 2014, 日本化学会講演予稿集, 94th(4) (4), 1104, Japanese光学活性バイアリール化合物のマトリックス中における円偏光発光(CPL)特性
- 05 Dec. 2013, 有機典型元素化学討論会講演要旨集, 40th, 174, Japaneseマトリックス固定化状態における粘稠性軸不斉ビナフチル化合物の円偏光発光特性
- 05 Dec. 2013, 有機典型元素化学討論会講演要旨集, 40th, 205, Japanese光学活性ナフタレン化合物のマトリックス中における円偏光発光特性
- 07 Sep. 2013, 光化学討論会講演要旨集, 2013, 117, Japanese軸不斉ビナフチル化合物のポリマーマトリックスによる円偏光発光(CPL)特性
- 03 Sep. 2013, 日本油化学会年会講演要旨集, 52nd, 228, Japanese光学活性ビナフチル誘導体における円偏光発光(CPL)の置換基効果
- 22 Aug. 2013, 基礎有機化学討論会要旨集, 24th, 435, Japanese粘稠性軸不斉ビナフチル化合物の固体状態における円偏光発光特性
- 10 May 2013, シンポジウム「モレキュラー・キラリティー」講演要旨集, 2013, (JA)119,(EN)118, Japanese粘稠軸不斉ビナフチル化合物の外部環境による非古典的光学特性制御
- ROYAL SOC CHEMISTRY, 2012, RSC ADVANCES, 2(33) (33), 13038 - 13038, EnglishChiral optofluidics: gigantic circularly polarized light enhancement of all-trans-poly(9,9-di-n-octylfluorene-2,7-vinylene) during mirror-symmetry-breaking aggregation by optically tuning fluidic media (vol 2, pg 3, 2012)Others
- Contributor, Chapter 17, Wiley-VCH, Weinheim, Apr. 2024, ISBN: 9783527351800Chiral Luminescence
- Contributor, 第1章 第2節 各種分離モードの種類・特色, 技術情報協会, Dec. 2023キャピラリー電気泳動法・イオンクロマトグラフィーの分析テクニック
- 第73回高分子討論会 (新潟県,新潟市), Sep. 2024, JapaneseDevelopment of Theoretical Models for Chiral Amplification of Dynamic Helical Polymers Using Chiral Guest Molecules[Invited]Invited oral presentation
- 膜サロン (兵庫県、神戸市), Mar. 2024, Englishキラル化合物の円偏光二色性と光学分割能[Invited]Invited oral presentation
- 日本化学会第104回春季年会 (千葉県、船橋市), Mar. 2024, English温度に依存して左右にねじれた立体配座が変換する 1:1 ホスト-ゲ ストシステムの解析Oral presentation
- 19th International Conference on Chiroptical Spectroscopy (CD2023) (Hiroshima, Hiroshima, Japan)), Sep. 2023, EnglishEquilibrium Shift between Left- and Right-Twisted Conformations in Host-Guest Systems: Theoretical Modeling and Chiroptical SimulationsOral presentation
- 第72回高分子学会年次大会 (群馬県、高崎市), May 2023, JapaneseDevelopment of Theoretical Models for Chiral Amplification of Dynamic Helical Polymers Using Chiral Guest Molecules
- 第69回高分子討論会 (Webexによるオンライン開催), Sep. 2020, Englishラセン構造を記憶したポリ(ビフェニルイルアセチレン)誘導体の不斉識別能Oral presentation
- 高分子学会東海支部夏季合宿 (Webexによるオンライン開催), Aug. 2020, Japaneseらせん構造の幾何的性質による高分子高次構造体の光学活性反転機構・ラセン記憶能を有するポリ(ビフェニルイルアセチレン)誘導体を 利用した不斉識別[Invited]Invited oral presentation
- 第69回高分子学会年次大会 (福岡県、福岡市), May 2020, Japaneseラセン記憶能を有するポリ(ビフェニルイルアセチレン)による光学分割Oral presentation
- 第100春季年会 (千葉県、野田市), Mar. 2020, JapaneseEnantioseparation using poly(biphenylylacetylene) derivatives with helicity memory capabilityOral presentation
- International Congress on Pure & Applied Chemistry Langkawi 2018 (Pusat Bandar Kuah, Langkawi, Malaysia), Oct. 2018, EnglishChiral Amplification of Mixed Micelle for Chiral Separation by Capillary Electrophoresis[Invited]Oral presentation
- 第8回CSJ化学フェスタ (東京都、江戸川区), Oct. 2018, Japaneseキャピラリー電気泳動を利用した混合ミセルにおける増幅現象の発現Poster presentation
- 第8回CSJ化学フェスタ (東京都、江戸川区), Oct. 2018, Japanese界面活性剤ミセルの界面における物質透過速度の一斉解析Poster presentation
- 第8回CSJ化学フェスタ(東京都、江戸川区), Oct. 2018, Japanese混合ミセルを用いたキラル増幅現象の発現Poster presentation
- 第8回CSJ化学フェスタ (東京都、江戸川区), Oct. 2018, Japaneseキャピラリー電気泳動を用いた分子間相互作用のモーメント解析Poster presentation
- 19th International Cyclodextrin Symposium (Chiyoda, Tokyo, Japan), Apr. 2018, EnglishChiral Separation of Phenoxypropionic Acid with Cyclodextrin: Kinetic Study by Moment Analysis Based on Affinity Capillary ElectrophoresisOral presentation
- Energy Materials Nanotechnology Asia (EMN Asia) Meeting on Computation and Theory (Trade Centre District, Dubai, UAE), Nov. 2017, EnglishInvestigation of Weak CH/π Interaction in the Structure of Dibromo-9,9’-dialkylfluorenes[Invited]Invited oral presentation
- ホスト-ゲスト・超分子化学研究会 (滋賀県、草津), Jun. 2017, Japaneseキャピラリー電気泳動法を利用する分子間相互作用の速度解析Oral presentation
- BIT’s 5th Annual Conference of AnalytiX 2017 (Fukuoka, Fukuoka, Japan), Mar. 2017, EnglishThe Intra-CH/π Interaction in Dibromo-9,9-dialkylfluorenes[Invited]Invited oral presentation
- 日本化学会第97春季年会 (神奈川県、横浜市), Mar. 2017, Japaneseキラルビスアミジンとアキラル色素で構成される水素結合錯体の溶液中における円偏光蛍光特性Oral presentation
- Energy Materials Nanotechnology Meeting on Photonics (Barcelona, Catalunya, Spain), Sep. 2016, EnglishChiral Graphene Quantum Dots[Invited]Invited oral presentation
- 251st American Chemical Society National Meeting & Exposition (San Diego, California, USA), Mar. 2016, EnglishDevelopment of force field for diorganopolysilanes: Silicon, carbon, and hydrogen systemPoster presentation
- 15th International Conference on Chiroptical Spectroscopy (Sapporo, Hokkaido, Japan), Aug. 2015, EnglishSide Chain Length Dependent Chiroptical inversion of Helical Polysilane AggregatesPoster presentation
- The 10th SPSJ International Polymer Conference (Tsukuba, Ibaraki, Japan), Dec. 2014, EnglishSystematical Conformation Search of Helical DialkyloligosilanePoster presentation
- GIST-NCTU-NAIST International Joint Symposium 2013 (Ikoma, Nara, Japan), Nov. 2013, EnglishChiroptical Inversion in Polymer Aggregates Induced by Geometrical Effect of Helical StructureOral presentation
- 第62回高分子討論会 (石川県、金沢市), Sep. 2013, Japaneseらせん構造の幾何的性質による高分子高次構造体の光学活性反転機構Oral presentation
- 第62回高分子討論会 (石川県、金沢), Sep. 2013, Japaneseハイパーブランチ型主鎖構造を有する光学活性ポリフルオレン誘導体の合成と物性Oral presentation
- The 9th International Polymer Conference (Kobe, Hyogo, Japan), Dec. 2012, EnglishUnderstanding Chiroptical Switching of Helical Polymer Supramolecules Based on a Mathematical ModelOral presentation
- 4th Asian Silicon Symposium (ASiS-4) (Tsukuba, Ibaraki, Japan), Oct. 2012, EnglishChirality in Polysilane AggregatesPoster presentation
- International Association of Colloid and Interface Scientists (Sendai, Miyagi, Japan), May 2012, EnglishHelical Polysilane Aggregates: Novel Side-Chain Length and Solvent Dependent (Chir)optical PropertiesPoster presentation
- 第57回高分子研究発表会 (兵庫県、神戸), Jul. 2011, Japanese貧溶媒・良溶媒系における光学活性ジアルキルポリシランのキロプティカルクロミズムPoster presentation
■ Research Themes
- 松籟科学技術振興財団, 研究助成, Apr. 2024 - Mar. 2026, Principal investigatorキラルな植物成分を利用した機能性ラセン高分子のラセン誘起メカニズムの解明と応用
- 物質・デバイス領域共同研究拠点, 基盤研究, Apr. 2024 - Mar. 2025, Principal investigatorラビング法に基づく異形粒子の作製
- 川西記念新明和教育財団, 研究助成, Apr. 2024 - Mar. 2025, Principal investigator機械的応力による高分子微粒子の形状制御法の開発
- 向科学技術振興財団, 研究助成, Apr. 2024 - Mar. 2025, Principal investigator一対のエナンチオマーの双方を活用した高効率光学分割法の開発
- ひょうご科学技術協会, 学術研究助成, Apr. 2024 - Mar. 2025, Principal investigatorラビング法を用いたキラルポリマー粒子作製法の確立
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Grant-in-Aid for Scientific Research (B), Nagoya University, Apr. 2021 - Mar. 2024不斉環境への応答性を有する二次元分子集合体の機能発現と理論解析
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Research (Exploratory), Grant-in-Aid for Challenging Research (Exploratory), Osaka University, Jun. 2019 - Mar. 2021, CoinvestigatorElucidation of mechanical properties in twisted cellulose nanofibersIn this study, the tensile and bending mechanical tests were conducted using the finite element model of a cellulose nanofiber (CNF) that is sufficiently long to exceed the torsion period, and the effect of the inherent right-handed torsion of natural CNFs on the mechanical performance was clarified. The contribution of both the contour torsion and the internal coordinate torsion was clarified. The final deformation response was found to be determined by the antagonistic effect of both torsional structures. In the tensile test, rotational displacement was suppressed by the internal coordinate torsion, while in the bending test, the contour torsion suppressed deformation in directions other than the loading direction. It is shown that the area moment of inertia of the model with contour torsion is periodically modulated, and the cause of the homogenization of the bendability was clarified.
- 日本学術振興会, 若手研究(B), 若手研究(B), Apr. 2017 - Mar. 2020Competitive research funding
- 科学研究費助成事業, 私立大学戦略的基盤形成支援事業, Apr. 2013 - Mar. 2018設計に基づく分子在制御の化学Competitive research funding
- 日本学術振興会, 研究活動スタート支援, 研究活動スタート支援, Aug. 2016 - Mar. 2017, Principal investigatorCompetitive research funding
- 日本学術振興会, 科学研究費助成事業, 特別研究員奨励費, Apr. 2013 - Mar. 2016Competitive research funding