高圧力の科学と技術
Online ISSN : 1348-1940
Print ISSN : 0917-639X
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11 巻 , 2 号
選択された号の論文の8件中1~8を表示しています
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特集 —高圧力下の流体物性計測—
解説
  • 澤村 精治, 松尾 博史
    原稿種別: 特集
    専門分野: その他
    11 巻 (2001) 2 号 p. 129-136
    公開日: 2003/02/28
    ジャーナル フリー
    We measured solubilities of several inorganic and organic compounds at high pressures up to 400 MPa, and temperatures between 273 and 323 K. For this purpose, care should be exercised for instrumentation. The results are shown for aqueous solutions of NaCl, NaCl·2H2O, CsCl, NH4Cl, toluene, anthracene, phenanthrene, and amino acids (Gly, Ala, Val, Leu, and Ile). In addition, we determined the solubility of C60 in n-hexane. The data for an individual system served to elucidate the mechanism of dissolution. For example, the data for toluene, anthracene, and phenanthrene in water provided insight into hydrophobic hydration.
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  • 内田 博久
    原稿種別: 特集
    専門分野: その他
    11 巻 (2001) 2 号 p. 137-144
    公開日: 2003/02/28
    ジャーナル フリー
    The solubility characteristics of aromatic compound isomers in supercritical carbon dioxide and the microscopic structures of supercritical carbon dioxide around the aromatic compound isomers were studied using the Monte Carlo simulation with a group contribution site model. Calculated solubilities were in good agreement with experimental data and the solubilities of isomers can also be quantitatively distinguished by the model. The microscopic structures of supercritical carbon dioxide around the aromatic compound isomers were found to be different because of the screen effect of substituents. The adsorption separation of aromatic compound isomers dissolved in supercritical carbon dioxide using zeolites, a process called “supercritical phase adsorption separation”, was newly proposed and the method was found to be effective for the separation of the isomers.
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  • 中村 裕一
    原稿種別: 特集
    専門分野: その他
    11 巻 (2001) 2 号 p. 145-152
    公開日: 2003/02/28
    ジャーナル フリー
    Physical properties of lubricants under high pressure (e.g., density, elastic constant and viscosity) are the fundamental properties for the tribological evaluation (i.e. friction and wear) of rolling bearings, gears and traction drives. This paper introduces the importance of such physical properties of lubricants under high pressure in tribology and the application of a diamond-anvil pressure cell (DAC) for tribological measurements. A falling sphere viscometry in the DAC facilitated the viscosity measurements up to 2 GPa. A photon-correlation technique with laser light scattering in the DAC enabled the viscosity estimation of solidified glassy state lubricants (viscosity is about 109 Pa·s) from structural relaxation. Dynamic elastic moduli were obtained from Brillouin light scattering measurements in the DAC up to 4 GPa, which enabled the evaluation of the frequency dispersion of elastic moduli with quasi-static data.
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