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Citation: LIANG Yaqing, HU Zhiyong, CAO Duanlin. Synthesis and Thermodynamics of Micellization of Sodium N-Acyl-L-serine[J]. Chinese Journal of Applied Chemistry, ;2013, 30(9): 1042-1047. doi: 10.3724/SP.J.1095.2013.20438 shu

Synthesis and Thermodynamics of Micellization of Sodium N-Acyl-L-serine

a. School of Chemical Engineering and Environment, North University of China, Taiyuan 030051, China;
b. Department of Chemistry, Changzhi College, Changzhi 046011, China

Received Date: 28 September 2012
Revised Date: 2 November 2012

N-Acyl-L-serine based surfactants were synthesized by using L-serine and three kinds of acyl chloride. The chemical structures of the prepared compounds were confirmed by ¹H NMR,ESI-MS and elemental analysis. The aggregation behaviors of sodium N-acyl-L-serine in water were investigated by surface tension at temperatures of 298 K,308 K,318 K,328 K,respectively. From these measurements,the critical micelle concentrations(cmc),the surface tension at the cmc(γ_cmc),saturated adsorption capacity Γ max and the standard thermodynamic parameters of micellization were calculated respectively. In term of the equation of cmc and temperature,the thermodynamic parameters by using phase separation model indicate that the standard Gibbs free energy (△G_m^o) of micellization is negative,the absolute value of the standard enthalpy of micellization, △H_m^o,is much smaller than the that of T△S_m^o in the aqueous solution. Temperature-dependant change of the standard enthalpy of micellization shows the micellization process is enthopy-driven. With the temperature increasing,the micellization is enthalpy-entropy compensated.
- N-acyl-L-serine,
- micelle,
- thermodynamic parameter,
- surface activity
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