Faculty Profiles - YAMAGUCHI, Tsuyoshi

Papers - YAMAGUCHI, Tsuyoshi

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Study of anomalous mobility of polar molecular solutions by means of the site-site memory equation formalism Reviewed

A.E. Kobryn, T. Yamaguchi, and F. Hirata

Journal of Molecular Liquids Vol. 125 ( 1 ) page： 14-21 2006

Solute Dependence of Mobility of Solvent Molecules in Solvophobic Solute Solutions: Dielectric Relaxation of Nonpolar Solute / Alcohol Mixtures Reviewed

A. Nagao, T. Yamaguchi, T. Matsuoka, and S. Koda

Journal of Physical Chemistry A Vol. 110 ( 10 ) page： 3377 2006

Language：English Publishing type：Research paper (scientific journal)

The dielectric relaxation spectra of alcohol/nonpolar solute mixtures are measured at several temperatures (-15CT25C) and for several molar fractions of solute (0Xs0.114) in the frequency range of 200MHzν20GHz. The double Debye type function is used for fitting of the spectra of mixtures, and the mean dielectric relaxation times (mean) of alcohol molecules are determined. In the systems having strong interaction between alcohol and nonpolar solutes, mean becomes shorter with an increase in the concentration of the solutes. On the other hand, mean becomes longer in the system having weak interaction between alcohol and nonpolar solutes. These results contradict with our intuitive predictions, do not correspond to mixing enthalpy, and are not explained by the hydrodynamic theory. They are attributed to the mechanism of the coupling between long-range electrostatic interactions and concentration fluctuation caused by the addition of solutes, which is suggested by Yamaguchi et al. based on the mode-coupling theory. [Yamaguchi, T.; Matsuoka, T.; Koda. S. J. Chem. Phys. 2004, 120, 7590]

Observation of Ultrasonic Relaxation due to Micelle-Monomer Exchange Process in Aqueous Solutions of Rodlike Micelles Reviewed

Tatsuro Matsuoka, Yukihiro Masuda, Tsuyoshi Yamaguchi and Shinobu Koda

Japanese Journal of Applied Physics Vol. 43 ( 5B ) page： 2924-2925 2005

Nuclear Magnetic Resonance and Molecular Dynamics Simulation Study on the Reorientational Relaxation of Solutes in Supercritical Methanol Reviewed

Tsuyoshi Yamaguchi, Nobuyuki Matubayasi, and Masaru Nakahara

Journal of Molecular Liquids Vol. 119 ( 1-3 ) page： 119-123 2005

Solvation dynamics in water investigated by RISM/mode-coupling theory Reviewed

Katsura Nishiyama, Tsuyoshi Yamaguchi, Fumio Hirata, and Tadashi Okada

Journal of Molecular Liquids Vol. 119 ( 1-3 ) page： 63-66 2005

Pressure dependence of diffusion coefficient and orientational relaxtion time for acetonitrile and methanol in water: DRISM/mode-coupling study Reviewed

A. E. Kobryn, T. Yamaguchi, and F. Hirata

Journal of Molecular Liquids Vol. 119 ( 1-3 ) page： 7-13 2005

Molecular dynamics simulation study on the transient response of solvation structure during the translational diffusion of solute Reviewed

T. Yamaguchi, T. Matsuoka, and S. Koda

Journal of Chemical Physics Vol. 122 ( 1 ) page： 014512 2005

Site-site memory equation approach in study of density/pressure dependence of translational diffusion coefficient and rotational relaxation time of polar molecular solutions: acetonitrile in water, methanol in water, and methanol in acetonitrile Reviewed

A. E. Kobryn, T. Yamaguchi, and F. Hirata

Journal of Chemical Physics Vol. 122 ( 18 ) page： 184511 2005

Generalized Langevin theory on the dynamics of simple fluids under external fields Reviewed

T. Yamaguchi, T. Matsuoka and S. Koda

Journal of Chemical Physics Vol. 123 ( 3 ) page： 034504 2005

Multi-pH Monte Carlo Simulation of Coil-Globule transition of weak polyelectrolyte Reviewed

T. Yamaguchi, T. Kiuchi, T. Matsuoka and S. Koda

Bulletin of the Chemical Society of Japan Vol. 78 page： 2098 2005

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

A multi-pH generalized ensemble simulation method is proposed; it is applied to the titration of the model weak polyelectrolyte. The first-order coil-globule transition is found in a poor solvent case. The conformation of the transition state is closely examined.

Solute dependence of polar solvation dynamics studied by RISM/mode-coupling theory Reviewed

Katsura Nishiyama, Tsuyoshi Yamaguchi, Fumio Hirata, and Tadashi Okada

Journal of Solution Chemistry Vol. 33 ( 6-7 ) page： 631-639 2004

Nuclear Magnetic Resonance Study on the Reorientational Relaxation in Supercritical Alcohols Reviewed

Tsuyoshi Yamaguchi, Nobuyuki Natubayasi, and Masaru Nakahara

Journal of Physical Chemistry A Vol. 108 ( 8 ) page： 1319-1324 2004

Mode-coupling analysis of the translational and rotational diffusion of polar liquids; acetonitrile and water Reviewed

T. Yamaguchi, S.-H. Chong and F. Hirata

Journal of Molecular Liquids Vol. 112 ( 3 ) page： 117-124 2004

Polar solvation dynamics: A combination of the reference interaction-site model and mode-coupling theories

Katsura Nishiyama, Tsuyoshi Yamaguchi, Fumio Hirata and Tadashi Okada

Pure and Applied Chemistry Vol. 76 ( 1 ) page： 71-77 2004

Mode-coupling study on the dynamics of hydrophobic hydration Reviewed

T. Yamaguchi, T. Matsuoka and S. Koda

Journal of Chemical Physics Vol. 120 page： 7590-7601 2004

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

The molecular motion of water in water-hydrophobic solute mixtures was investigated by the mode-coupling theory for molecular liquids based on the interaction-site description. When the model Lennard-Jones (LJ) solute
was mixed with water, both the translational and reorientational motions of solvent water
become slower, in harmony with various experiments and
molecular dynamics simulations. We compared the mechanism of the slowing down with that of the pressure dependence of the molecular motion of neat water [T. Yamaguchi, S.-H. Chong and F. Hirata, J. Chem. Phys. 119, 1021-1034 (2003)]. We found that the decrease in the solvent mobility caused by the solute can essentially
be elucidated by the same mechanism, that is, the fluctuation of the number density of solvent due to the cavity formation by the solute strengthens the friction on the collective polarization through the dielectric friction mechanism. We also employed the solute molecule
that is the same as solvent water except for the amount of
partial charges, in order to alter the strength of the solute-solvent interaction continuously.
The mobility of the solvent water was reduced both by
the hydrophobic and strongly hydrophilic solutes, but it
was enhanced in the intermediate case. Such a behavior was discussed in connection with the concept of positive and negative hydrations.

The statistical mechanics of the electro-acoustic effects of liquids Reviewed

T. Yamaguchi, T. Matsuoka and S. Koda

Journal of Chemical Physics Vol. 119 page： 4437-4448 2003

Mode-coupling calculation of the anomalous pressure effect on the ionic conductivity of molten LiBr Reviewed

T. Yamaguchi, T. Matsuoka and S. Koda

Journal of Chemical Physics Vol. 119 ( 21 ) page： 11306-11317 2003

A theoretical study on the anomalous pressure dependence of the transport properties of ionic liquids:Comparison among lithium bromide, silica and water Reviewed

T. Yamaguchi, A. Nagao, T. Matsuoka and S. Koda

Journal of Chemical Physics Vol. 119 page： 11306-11317 2003

Theoretical study on the molecular motion of liquid water under high pressure Reviewed

T. Yamaguchi, S.-H. Chong, and F. Hirata

Journal of Chemical Physics Vol. 119 page： 1021-1034 2003

Dielectric relaxation spectrum of water studied by the site-site generalized Langevin / modified mode-coupling theory Reviewed

T. Yamaguchi, S.-H. Chong, and F. Hirata

Molecular Physics Vol. 101 page： 1211-1220 2003

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Papers - YAMAGUCHI, Tsuyoshi