The Review of High Pressure Science and Technology

Foreword

Foreword

Takumi KIKEGAWA

2013 Volume 23 Issue 4 Pages 297-298
Published: 2013
Released on J-STAGE: December 28, 2013

DOIhttps://njjn-jsjc-gov-cn-s-1416.res.gxlib.org.cn:443/rwt/1416/https/MSYXTLUQPJUB/10.4131/jshpreview.23.297

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Reviews—Latest Researches on the Properties and Reactions of High-Pressure Fluids—

Electron Transfer Reaction and Proton Transfer Reaction in Supercritical Water

Yoshifumi KIMURA, Koji OSAWA, Issei KOBAYASHI

2013 Volume 23 Issue 4 Pages 300-308
Published: 2013
Released on J-STAGE: December 28, 2013

DOIhttps://njjn-jsjc-gov-cn-s-1416.res.gxlib.org.cn:443/rwt/1416/https/MSYXTLUQPJUB/10.4131/jshpreview.23.300

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In this article, recent studies on the electron transfer reaction and the proton transfer reaction in supercritical water were reviewed. Back electron transfer rate and the successive vibrational relaxation of p-nitroaniline dissolved in supercritical water were monitored by the ultrafast transient absorption spectroscopy. It was described how the changes of the dielectric constant and the hydrogen-bonding ability of water affect these phenomena. The proton transfer dynamics of 5-cynano-2-naphthol was studied by the time-resolved fluorescence spectroscopy. The reaction process was also strongly dependent on the hydrogen-bonding ability between water molecules.

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Water Structure under High Pressures and High Temperatures Studied by Energy-Dispersive X-Ray Diffraction and EPSR Modeling

Koji YOSHIDA, Koji FUJIMURA, Kazuya UCHI, Yoshinori KATAYAMA, Toshio Y ...

2013 Volume 23 Issue 4 Pages 309-318
Published: 2013
Released on J-STAGE: December 28, 2013

DOIhttps://njjn-jsjc-gov-cn-s-1416.res.gxlib.org.cn:443/rwt/1416/https/MSYXTLUQPJUB/10.4131/jshpreview.23.309

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Water structure under high-pressure and high-temperature conditions has been revealed by X-ray diffraction and empirical potential structure refinement (EPSR) modeling. X-ray diffraction measurements of water at temperatures (298 K/30 MPa, 473 K/30 MPa and 573 K/30 MPa) and at high pressures (298 K/1 GPa, 473 K/0.35 GPa and 486 K/4 GPa) were performed on energy-dispersive type X-ray diffractometers in laboratory and in a synchrotron radiation facility, respectively. The EPSR modeling using the experimental diffraction data generated three dimensional structure of water including the position of hydrogen atoms. With decreasing density, the coordination number of water molecule decreases at high temperatures. Pressure bends the hydrogen bonds between water molecules and makes the water structure under high-pressure condition similar to that of simple liquid (Ar, Hg, etc.) The unique properties of water under extreme conditions (supercritical and high-pressure conditions) would originate from the change of hydrogen bonds between water molecules and the coordination number of water.

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Volumetric Behavior of Dimethyl Ether+Ethanol Liquid Mixtures at 20℃ under High Pressure

Taka-aki HOSHINA, Koh-hei OHYA, Jun AKIBA, Tomoya TSUJI, Toshihiko HIA ...

2013 Volume 23 Issue 4 Pages 319-324
Published: 2013
Released on J-STAGE: December 28, 2013

DOIhttps://njjn-jsjc-gov-cn-s-1416.res.gxlib.org.cn:443/rwt/1416/https/MSYXTLUQPJUB/10.4131/jshpreview.23.319

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Densities of dimethyl ether (DME)+ethanol liquid mixtures were measured at 20℃ under high pressure up to 40 MPa. Densities of DME+ethanol mixtures decreased with increasing DME and increased with increasing pressure at 20℃. The composition dependence of the excess molar volumes showed concaved shape and had a minimum around 50 mol% of DME at any pressures studied. The hydrogen bond between the oxygen of a DME molecule and the −OH group of an ethanol molecule makes an important role in the volume change in DME+ethanol liquid mixtures at 20℃ under high pressure.

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Pressure-induced Vitrification and Decompression-induced Crystallizations of Ionic Liquids

Yukihiro YOSHIMURA, Hiroshi ABE, Takahiro TAKEKIYO, Nozomu HAMAYA

2013 Volume 23 Issue 4 Pages 325-331
Published: 2013
Released on J-STAGE: December 28, 2013

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In this article, we have reviewed the results on pressure-induced Raman spectral changes of two aliphatic quaternary ammonium-based room temperature ionic liquids, N, N-diethyl-N-methyl-N-(2-methoxyethyl)ammonium tetrafluoroborate ([DEME][BF₄]) and N, N-diethyl-N-methyl-N-(2-methoxyethyl)ammonium bis(trifluoromethylsulfonyl)imide ([DEME][TFSI]) up to ～6 GPa. We focus on the behavior whether they crystallize or hold a liquid state at high pressures. Here we report the very unique behavior of ionic liquids under high pressure that [DEME][BF₄] form a superpressed (glassy) state upon compression, and the crystallizations occur by releasing the pressure on the superpressurized liquid. On the other hand, [DEME][TFSI] also enters the glassy state as well, but the results together with the visual observations show that no crystallization occurs upon decompression. We believe that the results provide new insights into the phase transition behavior of ionic liquids, except for the liquid to solid or solid to solid transitions upon compression.

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Spectroscopic Study of Solvation Properties of Room-Temperature Ionic Liquids and Solvent Effect on Bimolecular Fluorescence Quenching Reaction at High Pressures

Noritsugu KOMETANI, Yoshinori MINAMIKAWA

2013 Volume 23 Issue 4 Pages 332-338
Published: 2013
Released on J-STAGE: December 28, 2013

DOIhttps://njjn-jsjc-gov-cn-s-1416.res.gxlib.org.cn:443/rwt/1416/https/MSYXTLUQPJUB/10.4131/jshpreview.23.332

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The solvation properties of some room-temperature ionic liquids (RTILs) and the solvent effect on bimolecular fluorescence quenching reaction have been examined at high pressures ranging from 0.1 to 300 MPa. It is found that Kamlet-Taft parameters (π^*, β) are sensitive to the type of anions, but not so dependent on the type of imidazolium cations consisting of RTILs. The pressure dependence of microviscosity is found to obey the empirical power-law equation. It is revealed that the rate constant for bimolecular fluorescence quenching reaction is significantly higher than theoretical rate constant of diffusion estimated from microviscosity, suggesting the occurrence of microscopic free space within RTILs which may facilitate the solute diffusion.

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Reviews

Sound Velocity-Density Relation Study for Iron Hydride using High Resolution Inelastic X-Ray Scattering and X-Ray Diffraction Methods

Yuki SHIBAZAKI

2013 Volume 23 Issue 4 Pages 339-346
Published: 2013
Released on J-STAGE: December 28, 2013

DOIhttps://njjn-jsjc-gov-cn-s-1416.res.gxlib.org.cn:443/rwt/1416/https/MSYXTLUQPJUB/10.4131/jshpreview.23.339

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In this article, my doctoral thesis, Behavior of hydrogen in the interior of the planets and satellites, was reviewed. I especially focus on the results of sound velocity measurements for iron hydride with the high resolution inelastic X-ray scattering here. The density evolution of the sound velocity of dhcp-FeH has been determined up to 70 GPa at room temperature from inelastic X-ray scattering and X-ray diffraction measurements. I found that the relationship between compressional wave velocity and density changes due to a magnetic transition from ferromagnetic to nonmagnetic FeH and that the nonmagnetic phase only follows the Birch's law. Assuming an ideal two-component mixing model, the hydrogen content of the Earth's inner core is obtained to be 0.30～0.37 wt% H, which corresponds to FeH_0.17～FeH_0.20.

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Obituary

A tribute to the Memory of the Late Prof. Endo

Hirotsugu TAKIZAWA

2013 Volume 23 Issue 4 Pages 347
Published: 2013
Released on J-STAGE: December 28, 2013

DOIhttps://njjn-jsjc-gov-cn-s-1416.res.gxlib.org.cn:443/rwt/1416/https/MSYXTLUQPJUB/10.4131/jshpreview.23.347

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A tribute to the Memory of the Late Prof. Hayashi

Atsushi SUZUKI

2013 Volume 23 Issue 4 Pages 348-349
Published: 2013
Released on J-STAGE: December 28, 2013

DOIhttps://njjn-jsjc-gov-cn-s-1416.res.gxlib.org.cn:443/rwt/1416/https/MSYXTLUQPJUB/10.4131/jshpreview.23.348

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Laboratory News

Akaogi laboratory, Department of Chemistry, Gakushuin University

Takayuki ISHII

2013 Volume 23 Issue 4 Pages 350-351
Published: 2013
Released on J-STAGE: December 28, 2013

DOIhttps://njjn-jsjc-gov-cn-s-1416.res.gxlib.org.cn:443/rwt/1416/https/MSYXTLUQPJUB/10.4131/jshpreview.23.350

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Salon

Research Scholar Report at UC San Diego, Scripps Institution of Oceanography

Masataka KUSUBE

2013 Volume 23 Issue 4 Pages 352-353
Published: 2013
Released on J-STAGE: December 28, 2013

DOIhttps://njjn-jsjc-gov-cn-s-1416.res.gxlib.org.cn:443/rwt/1416/https/MSYXTLUQPJUB/10.4131/jshpreview.23.352

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Report on the 24^th Biennial International Conference of the International Association for the Advancement of High Pressure Science and Technology (AIRAPT) (I)

Ayako OHMURA

2013 Volume 23 Issue 4 Pages 354-355
Published: 2013
Released on J-STAGE: December 28, 2013

DOIhttps://njjn-jsjc-gov-cn-s-1416.res.gxlib.org.cn:443/rwt/1416/https/MSYXTLUQPJUB/10.4131/jshpreview.23.354

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Report on the 24^th International Conference of the International Association for the Advancement of High Pressure Science and Technology (AIRAPT-24) (II)

Toshiyuki SUGIMOTO

2013 Volume 23 Issue 4 Pages 356-357
Published: 2013
Released on J-STAGE: December 28, 2013

DOIhttps://njjn-jsjc-gov-cn-s-1416.res.gxlib.org.cn:443/rwt/1416/https/MSYXTLUQPJUB/10.4131/jshpreview.23.356

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Report on the 18^th Biennial International Conference of the APS Topical Group on Shock Compression of Condensed Matter (APS-SCCM)

Tomoki Matsuda

2013 Volume 23 Issue 4 Pages 358-359
Published: 2013
Released on J-STAGE: December 28, 2013

DOIhttps://njjn-jsjc-gov-cn-s-1416.res.gxlib.org.cn:443/rwt/1416/https/MSYXTLUQPJUB/10.4131/jshpreview.23.358

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