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篇目详细内容 |
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【篇名】 |
Effects of CuCl2？H2O and ZnCl2？H2O on the viscosity of aqueous ethanol mixtures |
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【刊名】 |
Frontiers of Chemistry in China |
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【刊名缩写】 |
Front. Chem. China |
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【ISSN】 |
1673-3495 |
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【EISSN】 |
1673-3614 |
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【DOI】 |
10.1007/s11458-011-0234-9 |
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【出版社】 |
Higher Education Press and Springer-Verlag Berlin
Heidelberg |
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【出版年】 |
2011 |
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【卷期】 |
6
卷2期 |
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【页码】 |
113-119
页,共
7
页 |
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【作者】 |
A. Rasheed KHAN;
Fahim UDDIN;
Rehana SAEED;
Mahjabeen MUKHTAR;
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【关键词】 |
viscosity; Jones-Dole equation; ionic interactions; transition metal chlorides; thermodynamic parameters |
【摘要】 |
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The effects of CuCl2 and ZnCl2 on the viscosity in aqueous ethanol mixtures (10%–50%？v/v) were studied in the concentration range 1.0×10？2–8.0×10？2？mol·dm？3 at different temperatures. It was found that the viscosities increased with an increase in the concentration of the salts and percent composition of ethanol content, whereas it decreased with an increase in temperature. Ion-ion and ion-solvent interactions are determined with the help of A- and B-coefficients of Jones-Dole equation. The values of A- and B-coefficients are irregular and increase with a rise in temperature and also with an increase in ethanol contents for both salts. Negative values of B-coefficients show that ion solvent interactions is comparatively small and suggest that CuCl2 and ZnCl2 behave as structure breakers in aqueous ethanol mixtures. Thermodynamic parameters like the energy of activation (Eη) and change in entropy of activation (ΔS*) were also evaluated which confirm the structure breaker behavior of salts in aqueous ethanol mixtures. |
