Faculty Profiles - YAMAGUCHI, Tsuyoshi

Papers - YAMAGUCHI, Tsuyoshi

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Pseudo-critical behavior on the partial molar volume of solutes in the isotropic phase of liquid crystal Reviewed

Tatsuro Matsuoka, Shunsuke Nakamura, Tsuyoshi Yamaguchi, Shinobu Koda

Chemical Physics Letters Vol. 521 page： 78-80 2012.1

Shear relaxation of ammonium- and phosphonium-based ionic liquids with oxyethylene chain Reviewed

Tsuyoshi Yamaguchi, Ken-ichi Mikawa, Shinobu Koda, Hiroki Fukazawa, Hideaki Shirota

Chemical Physics Letters Vol. 521 page： 69-73 2012.1

Assignment of the dielectric relaxation of ionic liquid and its implication to the ionic conduction mechanism Reviewed

Tsuyoshi Yamaguchi and Shinobu Koda

Journal of Molecular Liquids Vol. 164 ( 1-2 ) page： 49-52 2011.11

Brownian dynamics simulation of a model simple electrolyte in solvents of low dielectric constant Reviewed

Tsuyoshi Yamaguchi, Taiga Akatsuka, and Shinobu Koda

Journal of Chemical Physics Vol. 134 ( 244506 ) page： 234506 2011.6

Roles of translational and reorientational modes in translational diffusion of high-pressure water: comparison with soft-core fluids Reviewed

Tsuyoshi Yamaguchi and Shinobu Koda

Journal of Chemical Physics Vol. 134 ( 23 ) page： 234506 2011.6

Dynamic mechanism of equivalent conductivity minimum of electrolyte solution Reviewed

Tsuyoshi Yamaguchi, Tatsuro Matsuoka, Shinobu Koda

Journal of Chemical Physics Vol. 135 ( 16 ) page： 164511 2011

Frequency-domain investigation of the ionic mobility of triflate salts in tetrahydrofuran Reviewed

Tsuyoshi Yamaguchi, Yukihiro Yamada, Tatsuro Matsuoka, Shinobu Koda, Yoshiro Yasaka, and Nobuyuki Matubayasi

Journal of Physical Chemistry B Vol. 115 ( 43 ) page： 12327-12676 2011

Mode-coupling theoretical analysis of transport and relaxation properties of liquid dimethylimidazolium chloride Reviewed

Tsuyoshi Yamaguchi and Shinobu Koda

Journal of Chemical Physics Vol. 132 ( 11 ) page： 114502 2010

Shear Relaxation of Imidazolium-Based Room-Temperature Ionic Liquids Reviewed

Tsuyoshi Yamaguchi, Miyake Sho and Shinobu Koda

Journal of Physical Chemistry B Vol. 114 ( 24 ) page： 8126-8133 2010

Solvation dynamics in polar solvents studied by means of RISM/mode-coupling theory Reviewed

Nishiyama, Katsura; Yamaguchi, Tsuyoshi; Hirata, Fumio

Journal of Physical Chemistry B Vol. 113 ( 9 ) page： 2800-2804 2009

Electric and mechanical relaxations of LiClO4-propylene carbonate systems in 100 MHz region Reviewed

Tsuyoshi Yamaguchi, Masashi Hayakawa, Tatsuro Matsuoka, and Shinobu Koda

Journal of Physical Chemistry B Vol. 113 ( 35 ) page： 11988-11998 2009

Effects of frequency and power of ultrasound on the size reduction of liposome Reviewed

Tsuyoshi Yamaguchi, Masaru Nomura, Tatsuro Matsuoka, and Shinobu Koda

Chemistry and Physics of Lipids Vol. 160 ( 1 ) page： 58-62 2009

A theoretical study on the frequency-dependent electric conductivity of electrolyte solutions II: Effect of hydrodynamic interaction Reviewed

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

Journal of Chemical Physics Vol. 130 ( 9 ) page： 094506 2009

A three-variable theory on the translation-reorientation coupling of molecular liquids Reviewed

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

Journal of Molecular Liquids Vol. 147 ( 1-2 ) page： 2-8 2009

Dynamic solvophobic effect and its cooperativity in the hydrogen-bonding liquids studied by dielectric and nuclear magnetic resonance relaxation Reviewed

Tsuyoshi Yamaguchi, Hiroki Furuhashi, Tatsuro Matsuoka, and Shinobu Koda

Journal of Physical Chemistry B Vol. 112 ( 51 ) page： 16633-16641 2008

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

The reorientational relaxation of solvent molecules in the mixture of nonpolar solutes and hydrogen-bonding liquids including water, alcohols and amides are studied by dielectric and 2H-nuclear magnetic resonance (NMR) spin-lattice relaxations. The retardation of the reorientational motion of the solvent by weak solute-solvent interaction is observed in all the solvent systems. On the other hand, no clear correlation between the strength of the solute-solvent interaction and the slowing down of the solvent motion is found in N,N-dimethylacetamide, which suggests the importance of the hydrogen bonding in the dynamic solvophobic effect. The cooperativity of the reorientational relaxation is investigated by the comparison between the collective relaxation measured by the dielectric spectroscopy and the single-molecular reorientation determined by NMR. The modification of the dielectric relaxation time caused by the dissolution of the solute is larger than that of the single-molecular reorientational relaxation time in all the solvents studied here. The effect of the static correlation between the dipole moments of different molecules is calculated from the static dielectric constant, and the effect of the dynamic correlation is estimated. The difference in the effects of the solutes on the collective and single-molecular reorientational relaxation is mainly ascribed to the dynamic cooperativity in the cases of water and alcohols, which is consistent with the picture on the dynamic solvophobicity derived by our previous theoretical analysis (Yamaguchi, T.; Matsuoka, T.; Koda, S. J. Chem. Phys. 2004, 120, 7590). On the other hand, the static correlation plays the principal role in the case of N-methylformamide.

A theoretical study on the frequency-dependent electric conductivity of electrolyte solutions Reviewed

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

Journal of Chemical Physics Vol. 127 ( 23 ) page： 234501 2007.12

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

The theory on the ultrasonic absorption of electrolyte solutions we have proposed previously [T. Yamaguchi, T. Matsuoka, and S. Koda, J. Chem. Phys., 126, 144505 (2007)] is extended to calculate the frequency-dependent electric conductivity of the solution. The ionic contribution of the dielectric relaxation spectrum is obtained at the same time.
The theory is able to handle the contributions of both the ion-pair dynamics and the relaxation of ionic atmosphere, as is the case of ultrasonic absorption. The effect of the barrier height between the contact and solvent-separated ion pairs is investigated in detail. It is clarified that the competition between the dissociation and reorientational
relaxation rates of the contact ion pair is an important factor for the ion pair to be regarded as the ion pair in terms of ionic conductivity.

Translational friction and momentum dissipation of a solute in simple liquid studied by generalized Langevin theory for liquid under external field Reviewed

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

Journal of Molecular Liquids Vol. 134 ( 1-3 ) page： 1-7 2007

Theoretical study on the sound absorption of electrolytic solutions. I. Theoretical formulation Reviewed

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

Journal of Chemical Physics Vol. 126 ( 14 ) page： 144505 2007

Theoretical study on the sound absorption of electrolytic solutions. II. Assignment of Relaxations Reviewed

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

Journal of Chemical Physics Vol. 127 ( 6 ) page： 064508 2007

Mode-coupling study on the dynamics of hydrophobic hydration II: Aqueous solutions of benzene and rare gases Reviewed

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

Physical Chemistry Chemical Physics Vol. 8 ( 6 ) page： 737-745 2006

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Papers - YAMAGUCHI, Tsuyoshi