Aggregation Behavior of Aqueous Solutions of 1-Dodecyl-3-methylimidazolium Salts with Different Halide Anions

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• 作者：Mingqi Ao ; Doseok Kim
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2013
• 出版时间：June 13, 2013
• 年：2013
• 卷：58
• 期：6
• 页码：1529-1534
• 全文大小：294K
• 年卷期：v.58,no.6(June 13, 2013)
• ISSN：1520-5134

文摘

The interfacial and bulk properties of the aqueous solutions of imidazolium-based ionic liquids with different halide anions ([C₁₂mim]Cl, [C₁₂mim]Br, [C₁₂mim]I) were investigated by surface tension and electrical conductivity measurements. The lowest surface tension (纬_cmc) and maximum surface excess concentration (螕_max) values from the surface tension measurements showed that [C₁₂mim]I had the highest surface activity. The thermodynamic pontentials of micellization (螖G⁰_m, 螖H⁰_m, 螖S⁰_m) indicated that the micellization of [C₁₂mim]Cl and [C₁₂mim]Br was entropy-driven, while that of [C₁₂mim]I was enthalpy-driven at 15 掳C but entropy-driven above 20 掳C. This distinct behavior for [C₁₂mim]I was thought to be due to the higher binding affinity of I^{鈥?/sup> to the micellar interface.}