Observation of mutual diffusion coefficients and cooperative motions in binary solutions of t-butyl alcohol-water and 2-butoxyethanol-water.
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概要
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Rayleigh scattering spectra were observed for the binary solutions of t-butyl alcohol(TBA)–water and 2-butoxyethanol (BE)–water. The observed line-widths were reduced to mutual diffusion coefficients. The observed concentration dependencies of the mutual diffusion coefficients were well explained by postulating the existence of "moving units"— a group of molecules which move together for a time much longer than the velocity autocorrelation time. The structure of the moving units which are formed in the TBA–water solution was (H<SUB>2</SUB>O)<SUB>20</SUB>TBA for <I>X</I><SUB>TBA</SUB>\lesssim0.05, and 4(H<SUB>2</SUB>O)<SUB>20</SUB>TBA for <I>X</I><SUB>TBA</SUB>\gtrsim0.05, where <I>X</I><SUB>TBA</SUB> is the mole fraction of TBA. For the BE–water solution, the structure was found to be (H<SUB>2</SUB>O)<SUB>50</SUB>BE for <I>X</I><SUB>BE</SUB>\lesssim0.02 and 3(H<SUB>2</SUB>O)<SUB>50</SUB>BE for <I>X</I><SUB>BE</SUB>\gtrsim0.02. These results were compared with the results which had been obtained from the concentration dependencies of the mean-square concentration fluctuation values.
- 公益社団法人 日本化学会の論文
著者
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Ito Nobuyuki
Department Of Electronics Faculty Of Engineering Nagoya University
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Saito Koichi
Department Of Agricultural Chemistry Faculty Of Agriculture Kyoto Prefectural University
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Fujiyama Tsunetake
Institute for Molecular Science
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Kato Tadashi
Institute for Molecular Science
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