A titration microcalorimeter and the vesicle of mixed surfactants

作     者：白光月 王玉洁 王金本 杨冠英 韩布兴 闫海科 

作者机构：Center of molecular science Institute of Chemistry Chinese Academy of Sciences Beijing 100080 China 

出 版 物：《Science China Chemistry》 (中国科学（化学英文版）)

年 卷 期：2000年第43卷第6期

页      面：617-624页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 

基　　金：the Chinese Academy of Sciences(29633020) the National Natural Science Foundation of China 

主　　题：titration microcalorimeter surfactant molecular self-assemble vesicle. 

摘      要：A titration microcalorimeter with the sample cells of 1 mL and 3 mL volume was constructed by combining LKB-2107 ampule microcalorimeter with an improved Thermometric titration microcalorimeter. Its sensitivity and precision were tested with the baseline noise and stability, the measurement of energy equivalent, and the linear relation of electric energy and integral area as the function of voltage(V)-time (t). Its accuracy was demonstrated by measuring the dilution enthalpy of a concentrated sucrose solution and the micelle-forming enthalpy of sodium dodecyl sulfate (SDS) in aqueous solution respectively. At the same time, the enthalpy of interaction between SDS and didodecyldimethylammonium bromide (DDAB) was measured by using the titration microcalorimeter, and the phase behavior of SDS-DDAB aqueous mixture was discussed. The microcalorimetric results show that the enthalpy of interaction between SDS and DDAB micelles is -29.53 kJ/mol, the enthalpy of formation of 1:1 SDS-DDAB salt is -125.8 kJ/mol, the vesicle-forming enthalpy of SDS-DDAB is 41.23 kJ/mol, and the enthalpy of phase transition from vesicles to SDS rich micelle is 32.10 kJ/mol.