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吉國, 忠亜 ; 中川, 徹夫
概要:
application/pdf<br />Departmental Bulletin Paper
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吉國, 忠亜 ; 岐山, 洋子 ; 田中, 美紀 ; 中川, 徹夫
概要:
application/pdf<br />Departmental Bulletin Paper
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吉國, 忠亜 ; 針谷, 尚志 ; 中川, 徹夫
概要:
application/pdf<br />Departmental Bulletin Paper
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吉國, 忠亜 ; 若林, 愛 ; 中川, 徹夫
概要:
application/pdf<br />Departmental Bulletin Paper
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吉國, 忠亜 ; 針谷, 尚志 ; 桑原, 江美子 ; 須田, 裕美 ; 中川, 徹夫
概要:
application/pdf<br />Departmental Bulletin Paper
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吉國, 忠亜 ; 桑原, 江見子 ; 針谷, 尚志 ; 中川, 徹夫
概要:
application/pdf<br />Departmental Bulletin Paper
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中川, 徹夫 ; 吉國, 忠亜 ; 境野, 芳子
概要:
application/pdf<br />Departmental Bulletin Paper
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研究代表者 中川徹夫
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萩原, 克明 ; 中川, 徹夫
概要:
application/pdf<br />Departmental Bulletin Paper<br />The Kirkwood-Buff(KB) integrals Gij(ij:cyclohexane or solvent)have been calculated for cyclohexane binary liquid mixtures over the whole concentration range at 298.15 K using the
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thermodynamic properties such as isothermal compressibilities, excess molar volumes, and excess molar Gibbs energies. Successively, their related parameters such as the KB integral differences from idela solutions, concentration and density fluctuations, linear coefficients of preferential solvations, and excess numbers of molecules are estimated from the KB integrals. for the systems whose solvents are hydrocharbons such as hexane and tetradecane the KB integrals and their related parameters change monotonically which changing concentration, and their magnitudes are comparatively small. These facts suggest that van der Waals interaction is predominant and no spcific interactions exist in the cyclohexane-hydrocarbon systems. On the other hand, for the systems whose solvents have the polar atoms or groups such as -Cl, -CO, and -OH anmely, 1,2-dichloroethane, acetone, and 2-propanol, these values change drastically with changing concentration, and the maxima for G11 and G22 and the minima ofr G12 appear at certain concentrations. These phenomena are due to self-associations of respective components. In particular, for the systems whose solvents are kelones and alcohols, self-associations of respective components are more propressed. These results indicate that both the dipole-dipole attractive force between ketone melecules and the hydrogen bond between alcohol ones play an important role in the systems and these solvents prefer to associate themselves. Consequently, cyclohexane molecules also tend to collect together for lack of solvents around them.
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| 10.
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中川, 徹夫
概要:
application/pdf<br />Departmental Bulletin Paper<br />The linear coefficients of preferential solvations 〓 and the exces
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s numbers of molecules Δn〓 (i, j = 1, 2, 1: hexane, 2: hexane isomers) have been calculated for the four hexane-hexane isomer (2-methylpentane, 3-methylpentane, 2, 2-dimethylbutane, or 2, 3-dimethylbutane) binary mixtures over the whole concentration range at 25℃ using the Kirkwood-Buff (KB) integrals and the number densities. The differences of the 〓 values from ideal solutions proposed by Matteori and by Shulgin and Ruckenstein Δ〓 and Δ〓 have also been estimated. The Δ〓 values are nearly the same as the Δ〓 ones for all systems over the whole concentration range, and the concentration dependences of Δ〓 resemble those of 〓 for all systems. The Δ〓 values are positive for the hexane-2-methylpentane and -3-methylpentane systems over the whole concentration range, while negative for the hexane-2,2-dimethylbutane and - 2,3-dimethylbutane systems. Moreover, the Δn〓 and Δn〓 values are negative and positive, respectively for the hexane-2-methylpentane and -3- methylpentane systems over the whole concentration range, while positive and negative, respectively for the hexane-2,2-dimethylbutane and-2,3-dimethylbutane systems. These facts suggest that the former and latter systems prefer to form self- and hetero-associations, respectively, and are in good agreement with our previous results.
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