EMLG-JMLG Annual Meeting 2010

Complex liquids: Modern trends in
exploration, understanding and application

European Molecular Liquids Group (EMLG)    Japanese Molecular Liquids Group (JMLG)
Institute for Condensed Matter Physics of National Academy of Sciences of Ukraine

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Organisation for the Prohibition of Chemical Weapons

Thermal behavior, structure and dynamics of liquids and electrolyte solutions confined in mesoporous materials

Toshio Yamaguchi

Department of Chemistry, Faculty of Science, Fukuoka University, and Advanced Materials Institute, Fukuoka University, Japan
e-mail: yamaguchfukuoka-u.ac.jp

Liquids and solutions in confinement and/or interface play an important role in natural environments, such as sedimentation in clays, in biological systems like membrane proteins, and in industrial applications such as separation columns and fuel cells. In particular, water confined in pores of ~21 Å diameter or less is stable in the liquid state in a temperature range down to 140 K; resultantly, low temperature confined water has drawn much attention as a model of non freezable water in biological system. Thus, the thermal, structural and dynamic properties of liquids and solutions under nanometer-scale confinement at a molecular level are essential for understanding their roles and the underlying mechanisms of processes going in the systems. These properties of liquids and solutions in confinement would originate from both confinement, i.e. pore size, and a balance between intermolecular forces and the molecule-surface interaction. This talk reviews the results of our studies on the thermal, structural and dynamic properties of molecular liquids, water, methanol, and acetonitrile with different hydrogen bonding nature and of aqueous electrolyte solutions confined in mesoporous vitreous silica MCM-41 with different pore sizes, cross-linked dextran polymer Sephadex G15, and activated carbons as revealed by differential scanning calorimetry, FTIR, X-ray and neutron diffraction, dielectric relaxation, quasi-elastic neutron scattering and neutron spin- echo measurements.

References

1. T. Yamaguchi, H. Hashi, S. Kittaka, J. Mol. Liq., 129, 57-62 (2006).
2. S. Kittaka, S. Ishimaru, M. Kurahashi, T. Matsuda, T. Yamaguchi, Phys. Chem. Chem. Phys., 8, 3223-3231 (2006).
3. T. Yamaguchi, K. Yoshida, P. Smirnov, T. Takamuku, S. Kittaka, S. Takahara, Y. Kuroda, M.-C. Bellissent-Funel, Eur. Phys. J. Special Topics 141, 19-27 (2007).
4. K. Yoshida, T. Yamaguchi, S. Kittaka, M.-C. Bellissent-Funel, P. Fouquet, J. Chem. Phys. 129, 054702-1-11 (2008).
5. S. Kittaka, K. Sou, T. Yamaguchi, K. Tozaki, Phys. Chem. Chem. Phys., 11, 8538-8545 (2009).