کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5413686 | 1506628 | 2007 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Heterogeneity of acetonitrile-water mixtures in the temperature range 279-307Â K studied by small-angle neutron scattering technique
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
At 279, 287, 298, and 307Â K the heterogeneity of acetonitrile-water mixtures in a range of acetonitrile mole fraction xAN from 0.2 to 0.6 has been evaluated in terms of Ornstein-Zernike correlation length, concentration and density fluctuations, and Kirkwood-Buff parameters obtained from small-angle neutron scattering (SANS) experiments. At 298Â K the correlation lengths for CH3CN-D2O (DÂ =Â 2H) and CD3CN-H2O mixtures have shown that the heterogeneity of acetonitrile-water mixtures at xANÂ =Â 0.3 and 0.4 is most enhanced in the mole fraction range examined. With decreasing temperature from 307 to 279Â K, the correlation length and the fluctuations for CH3CN-D2O mixtures at xANÂ =Â 0.3 and 0.4 most significantly rise in the mole fraction range. The Kirkwood-Buff parameters have revealed that both acetonitrile-acetonitrile and water-water interactions in acetonitrile-water mixtures at the same mole fractions remarkably increase with decreasing temperature, whereas acetonitrile-water interactions decrease. According to all the parameters estimated, a change in mixing state of acetonitrile-water mixtures with lowering temperature was discussed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Liquids - Volume 136, Issues 1â2, 15 November 2007, Pages 147-155
Journal: Journal of Molecular Liquids - Volume 136, Issues 1â2, 15 November 2007, Pages 147-155
نویسندگان
Toshiyuki Takamuku, Yasukuni Noguchi, Masaru Matsugami, Hiroki Iwase, Toshiya Otomo, Michihiro Nagao,