Rev. High Pressure Sci. Technol.

Vol.4  No.3(1995) Abstract

Rev. High Pressure Sci. Technol. 4-3,186-192(1995)
The Structure and Dynamics of Water at High Temperature and Pressure
中原 勝
We have discussed how the tetrahedral structure and dynamical properties of water are varied with pressure and temperature, focusing on the hydrogen-bonding interactions and the molecular packing efficiency. Anomalous properties of water are controlled by the strong and directional hydrogen bonds which are bent by an increase in pressure or temperature. It is shown that the hydrogen bonds are not completely broken in hot dense water near the critical temperature.

[hot water, compressed water, structure, dynamics, hydrogen bonds, NMR, chemical shift, rotational relaxation, activation energy]
〒611-0011 宇治市五ヶ庄 京都大学化学研究所
Institute for Chemical Research, Kyoto University, Uji-city, Kyoto 611-0011, Japan

Rev. High Pressure Sci. Technol. 4-3,193-200(1995)
Microscopic Structure of Supercritical Water
山口 敏男
The microscopic structure of sub- and supercritical water has recently been determined by novel liquid X-ray diffraction using an imaging plate detector and neutron diffraction with isotopic substitution. The X-ray and neutron results are compared with those obtained by Monte Carlo and molecular dynamics computer simulations and Raman and infrared spectroscopy. A recent attempt to obtain the three-dimensional structure of supercritical water by spherical harmonic expansion method is also described. Discussion is focused on the degree of hydrogen bonding in supercritical water and its correlation with physicochemical properties.

[supercritical water, X-ray and neutron diffraction, computer simulation, Raman and infrared spectroscopy, structure, hydrogen bonding]
〒814-0180 福岡市城南区七隈8-19-1 福岡大学理学部化学科
Department of Chemistry, Faculty of Science, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka 814-0180

Rev. High Pressure Sci. Technol. 4-3,201-207(1995)
Phase Relation of Amorphous and Liquid H2O
三島 修
Recent high-pressure and low-temperature experiments have properly demonstrated polymorphism and the first-order transition between the low- and high-density amorphous ices. Experimental and theoretical results further suggested the existence of a phase transition, as well as a critical point, in supercooled liquid water. The phase behavior of these amorphous ices and its relation to the liquid water are discussed.

[high pressure, ice, structure, water, transition, amorphous, glass]
〒305-0044 つくば市並木1-1 無機材質研究所超高圧力ステーション
National Institute for Research in Inorganic Materials, 1-1, Namiki, Tsukuba, 305-0044

Rev. High Pressure Sci. Technol. 4-3,208-214(1995)
Elastic Properties in High Pressure Ice-?ZPhase
佐々木 重雄 清水 宏晏
Shigeo SASAKI, Hiroyasu SHIMIZU
The pressure dependences of sound velocities, refractive index and elastic constants in ice-?Z phase have been determined up to 8 GPa at 300 K by high-pressure Brillouin spectroscopy developed for a single molecular crystal grown in a diamond anvil cell. The Cauchy relation of C12=C44 was found at each pressure. This result suggests that the interactions between the oxygen atoms can be described by central forces, which plays one of key roles in the extreme pressure stability in the ice-?Zphase.

[ice-?Z, Brillouin scattering, sound velocity, elastic constant, refractive index, Cauchy relation , diamond anvil cell]
〒501-1193 岐阜市柳戸1-1 岐阜大学工学部電気電子工学科
Department of Electrical and Electronic Engineering, Gifu University, 1-1 Yanagido, Gifu 501-1193

Rev. High Pressure Sci. Technol. 4-3,215-222(1995)
Infrared Absorption Study of High-Pressure Ice-?Z Phase
青木 勝敏
Katsutoshi AOKI
Two resonance phenomena have been observed in ice-?Z phase by infrared absorption measurement to 110 GPa: Fermi resonance between the stretching and the overtone of the bending vibration around 25 GPa and Fano unti-resonance related to the anharmonic stretching vibration above 40 GPa. These spectral features provide new insight into the pressure variation and the symmetrization mechanism of the hydrogen bond.

[ice-?Z, infrared absorption, Fermi resonance, Fano unti-resonance, DAC]
〒305-8565 茨城県つくば市東1-1 物質工学工業技術研究所
National Institute of Materials and Chemical Research, Higashi 1-1, Tsukuba, Ibaraki 305-8565

Rev. High Pressure Sci. Technol. 4-3,223-230(1995)
Phase Behavior of Phospholipid Bilayer Membranes under High Pressure
金品 昌志 松木 均
Pressure studies of phospholipid bilayer membranes are reviewed. The effect of pressure on the phase transition temperatures of dipalmitoylphosphatidylcholine bilayer membranes were determined by the various physical techniques including dilatometry, ESR, X-ray diffraction, fluorescence, Raman spectroscopy, neutron diffraction, light transmission, and NMR. In addition to the liquid crystal, ripple gel lamellar gel phases, a new pressure-induced, interdigitated gel phase is presented.

[bilayer membrane, lipid, vesicle, phase transition, anesthesia, pressure reversal]
〒770-8506 徳島市南常三島町2-1 徳島大学工学部生物工学科
Department of Biological Science and Technology, Faculty of Engineering, The University of Tokushima, Minamijosanjima, 770-8506

Rev. High Pressure Sci. Technol. 4-3,231-237(1995)
C60 Polymer Synthesized at High Pressure
岩佐 義宏1 有馬 孝尚2
Yoshihiro IWASA, Takahisa ARIMA
Recent discovery of C60 polymers is reviewed. Application of high pressure(5 GPa) and high temperature(〜800℃) to pure C60 produces a new solid form with a rhombohedral unit cell. In this crystal, neighboring C60 molecules are bonded by four membered rings forming a two-dimensional polymer of C60. Different conditions of pressure and temperature produce other polymeric forms. Alternative approaches for synthesizing C60 polymers are compared with the high pressure synthesis.

[C60, high pressure synthesis, solid state polymerization]
1〒923-1292 石川県能美郡辰口町旭台1-1 北陸先端科学技術大学院大学材料科学研究科
Japan Advanced Institute of Science and Technology, 15 Asahidai, Tatsunokuchi, Ishikawa 923-1292
2〒103 東京都文京区本郷7-3-1 東京大学工学部
Department of Applied Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113

Rev. High Pressure Sci. Technol. 4-3,238-241(1995)
Measurement of Magnetoresistance at High Pressure
巨海 玄道1 加賀山 朋子2
Simple high pressure apparatus has been designed to measure physical properties of condensed matters at high magnetic field. The magnetoresistance of borocarbide is briefly reported as an example of measurement. It is emphasized that this type of measurement is very important for understanding the electronic structure of metals ad alloys.

[magnetoresistance, low temperature, magnetic field, superconductivity]
1 〒810-8560 福岡市中央区六本松4-2-1 九州大学大学院理学研究院物理学部門基礎粒子系化学専攻
Kyushu University, 4-2-1, Ropponmatsu, Chuou-ku, Hukuoka 810-8560
2 〒860-8555 熊本市黒髪2-39-1 熊本大学工学部知能生産システム工学科
Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555

Rev. High Pressure Sci. Technol. 4-3,242-244(1995)
Measurements of Transport Properties of Supercritical Fluids by the Transient Grating Method
木村 佳文
Yoshifumi KIMURA
The transient grating method with a high pressure optical cell is presented for determinations of sound velocity, sound absorption coefficient and thermal diffusion constant of supercritical fluids. By choosing proper probe molecules which are photochemically active, mass diffusion constants of transient molecules in supercritical fluids are also measured.

[transient Grating, supercritical fluid, sound velocity, thermal diffusion, mass diffusion]
〒606-8502 京都市左京区北白川追分町 京都大学大学院理学研究科化学教室光物理化学研究室
Department of Chemistry Faculty of Science, Kyoto University, Kyoto 606-8502

京都市左京区下鴨森本町 15 (財)生産開発科学研究所内
Tel (075)721-0376 Fax (075)723-9629