The Review of High Pressure Science and Technology

Foreword

Foreword

Yasuo Ohishi

2016 Volume 26 Issue 4 Pages 285-286
Published: 2016
Released on J-STAGE: December 27, 2016

DOIhttps://njjn-jsjc-gov-cn-s-1416.res.gxlib.org.cn:443/rwt/1416/https/MSYXTLUQPJUB/10.4131/jshpreview.26.285

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Reviews —High Pressure Phase Behavior of Homogeneous and Heterogeneous Liquids—

Experimental Verification of Liquid-liquid Critical Point Hypothesis from the View Point of ‘Fluctuations’

Yukio KAJIHARA

2016 Volume 26 Issue 4 Pages 288-296
Published: 2016
Released on J-STAGE: December 27, 2016

DOIhttps://njjn-jsjc-gov-cn-s-1416.res.gxlib.org.cn:443/rwt/1416/https/MSYXTLUQPJUB/10.4131/jshpreview.26.288

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We have studied liquid-liquid phase transition systems from the view point of ‘fluctuations’. New experimental concept we have recently developed is used to detect ‘fluctuations’. The advantage of the method is the simplicity: just compare the two sound velocities, high-frequency one obtained by inelastic x-ray scattering technique and low-frequency one measured by ultrasonic method. We think it will make a substantial contribution to verify the liquid-liquid critical point hypothesis. In this article, we summarize the history of experimental verification of liquid-liquid critical point hypothesis at first. Then, we show some results of our ‘fluctuations’ measurements and explain the theoretical background of the method. Finally, perspective of the method will be given. We believe it will also play a crucial role to understand glass transition phenomena.

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Phase Behavior of n-Alkanes under High Pressure

Motoi YAMASHITA, Minoru KATO

2016 Volume 26 Issue 4 Pages 297-307
Published: 2016
Released on J-STAGE: December 27, 2016

DOIhttps://njjn-jsjc-gov-cn-s-1416.res.gxlib.org.cn:443/rwt/1416/https/MSYXTLUQPJUB/10.4131/jshpreview.26.297

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The effect of pressure on the phase transition behavior of tridecane, pentadecane and heptadecane has been investigated up to 489, 220 and 387 MPa, respectively, using Fourier transform infrared spectroscopy at 25℃. Short range positional order in the rotator phase is discussed on the basis of factor group splitting of the P₁+P₃ band of the methylene rocking mode. A large proportion of alkane molecules is found to possess herringbone-type short-range positional order in the high pressure rotator phase while a smaller proportion of alkane molecules is considered to possess herringbone-type short-range positional order in the high temperature rotator phase.

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High Pressure Phase Transition Behavior of Imidazolium-based Ionic Liquids

Takahiro TAKEKIYO, Hiroshi ABE, Nozomu HAMAYA, Yukihiro YOSHIMURA

2016 Volume 26 Issue 4 Pages 308-314
Published: 2016
Released on J-STAGE: December 27, 2016

DOIhttps://njjn-jsjc-gov-cn-s-1416.res.gxlib.org.cn:443/rwt/1416/https/MSYXTLUQPJUB/10.4131/jshpreview.26.308

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High pressure (HP) phase transition behavior of 1-alkyl-3-methylimidazolium-based ionic liquids ([C_nmim]-ILs) studied using optical spectroscopy was reviewed. On the whole, [C_nmim]-ILs under high pressure showed at least three transition patterns; (i) HP-glassy state, (ii) compression crystallization, and (iii) decompression crystallization. The glass transition pressure (p_g) and compression or decompression crystallization pressure (p_c or p_d.c) throughout the reported [C_nmim]-ILs were observed in the pressure range from 1.0 to 3.0 GPa for p_g, below 1.0 GPa for p_c, and below 2.0 GPa for p_d.c, respectively. We discussed the selectivity between the HP-glassy state and compression crystallization of [C_nmim]-ILs.

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Aqueous Solutions and Water Polyamorphism

Yoshiharu SUZUKI

2016 Volume 26 Issue 4 Pages 315-322
Published: 2016
Released on J-STAGE: December 27, 2016

DOIhttps://njjn-jsjc-gov-cn-s-1416.res.gxlib.org.cn:443/rwt/1416/https/MSYXTLUQPJUB/10.4131/jshpreview.26.315

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From a viewpoint of water polyamorphism, we examined the polyamorphic behaviors of the glass of dilute aqueous solutions, a glycerol-water system and a LiCl-water system, under pressure. The polyamorphic behaviors of aqueous solution are consistent with the water polyamorphism. The solvent water in the glassy aqueous solution is able to be classified as LDA-like or HDA-like solvent waters. A coexistent region of LDA-like and HDA-like solvent waters exists in the polyamorphic diagram of the aqueous solutions, and then the extent of the coexistence region depends on the solute concentration and the solute composition.

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Effect of Rotation on Vibrational Spectrum of Supercritical Water: Analysis of Dependencies on Density and Hydrogen Isotopes

Ken YOSHIDA, Nobuyuki MATUBAYASI, Masaru NAKAHARA, Yasuhiro UOSAKI

2016 Volume 26 Issue 4 Pages 323-332
Published: 2016
Released on J-STAGE: December 27, 2016

DOIhttps://njjn-jsjc-gov-cn-s-1416.res.gxlib.org.cn:443/rwt/1416/https/MSYXTLUQPJUB/10.4131/jshpreview.26.323

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In this article, we review the recent advances made in our group in the analysis of the line shape of the vibrational spectra in supercritical water. The vibrational dynamics of water in supercritical states has been examined by means of the classical MD simulation by paying particular attention to the relation to the rotational dynamics. Through the analysis of the effects of the water density and the isotopes of hydrogen, we revealed that the rotational couplings are the dominant determining factors of the line shape of the O-H vibrational spectrum in supercritical water.

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Frontiers

Development of High Pressure Processing Equipment for Oyster Shucking

Hiroshi SHIRAKASHI

2016 Volume 26 Issue 4 Pages 333-335
Published: 2016
Released on J-STAGE: December 27, 2016

DOIhttps://njjn-jsjc-gov-cn-s-1416.res.gxlib.org.cn:443/rwt/1416/https/MSYXTLUQPJUB/10.4131/jshpreview.26.333

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High pressure processing is an alternative technology for preservation of foods or causes detachment an adductor muscle of shellfish. This article describes the high pressure processing equipment which had been newly developed for oyster shucking and opening without heat-treatment.

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Laboratory News

High-Pressure Mineral Physics laboratory, Ohta Group, Tokyo Institute of Technology

Sho SUEHIRO, Tatsuya WAKAMATSU, Yoshiyuki OKUDA

2016 Volume 26 Issue 4 Pages 336-337
Published: 2016
Released on J-STAGE: December 27, 2016

DOIhttps://njjn-jsjc-gov-cn-s-1416.res.gxlib.org.cn:443/rwt/1416/https/MSYXTLUQPJUB/10.4131/jshpreview.26.336

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Salon

Report on 9^th International Conference on High Pressure Bioscience and Biotechnology (HPBB2016)

Kazutaka YAMAMOTO

2016 Volume 26 Issue 4 Pages 338-339
Published: 2016
Released on J-STAGE: December 27, 2016

DOIhttps://njjn-jsjc-gov-cn-s-1416.res.gxlib.org.cn:443/rwt/1416/https/MSYXTLUQPJUB/10.4131/jshpreview.26.338

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