文献类型：期刊文献

英文题名：Interaction between biosurfactant surfactin and cationic surfactant cetyl trimethyl ammonium bromide in mixed micelle

作者：Wang, Hao[1,2];Gang, Hongze[1,2];Ye, Ruqiang[1,2];Mu, Bozhong[1,2]

机构：[1]E China Univ Sci & Technol, State Key Lab Bioreactor Engn, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, Inst Appl Chem, Shanghai 200237, Peoples R China

年份：2014

卷号：292

期号：12

起止页码：3169

外文期刊名：COLLOID AND POLYMER SCIENCE

收录：;EI(收录号：20143600025360);WOS:【SCI-EXPANDED(收录号:WOS:000344880000011)】；

基金：This work was supported by the National Natural Science Foundation of China (No. 21203063) and the Fundamental Research Funds for the Central Universities of China (No. WK1213003, WJ1214066).

语种：英文

外文关键词：Mixed micelle; Synergism; Surfactin; Cetyl trimethyl ammonium bromide; Surface tension; Fluorescence

摘要：An anionic/cationic mixed surfactant aqueous system of surfactin and cetyl trimethyl ammonium bromide (CTAB) at different molar ratios was studied by surface tension and fluorescence methods (pH 8.0). Various parameters that included critical micelle concentration (cmc), micellar composition (X (1)), and interaction parameter (beta (m)) as well as thermodynamic properties of mixed micelles were determined. The beta (m) was found to be negative and the mixed system was found to have much lower cmc than pure surfactant systems. There exits synergism between anionic surfactin and cationic CTAB surfactants. The degree of participation of surfactin in the formation of mixed micelle changes with mixing ratio of the two surfactants. The results of aggregation number, fluorescence anisotropy, and viscosity indicate that more packed and larger aggregates were formed from mixed surfactants than unmixed, and the mixed system may be able to form vesicle spontaneously at high molar fraction of surfactin.