Temperature Effect and Enthalpy-entropy Compensation of the Mixed Micellization of C12-s-C12· 2Br and Alcohol in Aqueous Solution

Abstract

Abstract: The mixed micellization of quaternary ammonium gemini surfactants C₁₂-s-C₁₂·Br (s=2,3, 4,6) and alcohols(n-propanol, n-butanol, H-pentanol and n-hexanol) in aqueous solutions has been investigated at different temperatures by using conductivity measurements. The results show that the critical micelle concentrationdn(In(cmc)) gradually increases with increasing temperature. The thermodynamic parameters calculated by phase separation model indicate that the mixed micellization of C₁₂-s-C₁₂·Br and alcohol is an entropy-driven process. The entropy-driven is enhanced as temperature is going up. All plots of enthalpy-entropy compensation exhibit an excellent linearity. At a fixed temperature, is decreased and the micelle stability is enhanced with increasing the carbon atom number(n) in the alkyl chain of alcohol molecule. However, these properties have an opposite trend with increasings.

Key words: Quaternary ammonium gemini surfactants, Alcohol effects, Micellization, Temperature effect

CLC Number:

O648.1

TrendMD:

ZHAO Jian-Xi, YOU Yi, ZHU Yong-Ping, YANG Qi-Yu. Temperature Effect and Enthalpy-entropy Compensation of the Mixed Micellization of C₁₂-s-C₁₂· 2Br and Alcohol in Aqueous Solution[J]. Chem. J. Chinese Universities, 2003, 24(5): 845.

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Temperature Effect and Enthalpy-entropy Compensation of the Mixed Micellization of C₁₂-s-C₁₂· 2Br and Alcohol in Aqueous Solution

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