文献类型：期刊文献

英文题名：Micellization in binary biosurfactant/synthetic surfactant systems: Effects of temperature and hydrophobic group structure of alkyl benzenesulfonate

作者：Kong, Lingling[1,2];Gang, Hongze[1,2];Wang, Zijun[3];Li, Tianfu[3];Jafta, Charl J.[4,6];Fei, Dan[1,2];Ye, Ruqiang[1,2];Mu, Bozhong[1,2,5]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, State Key Lab Bioreactor Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem & Mol Engn, Appl Chem Inst, 130 Meilong Rd, Shanghai 200237, Peoples R China;[3]China Inst Atom Energy, Beijing 102413, Peoples R China;[4]Helmholtz Zentrum Berlin Mat & Energie, Lise Meitner Campus, D-14109 Berlin, Germany;[5]Shanghai Collaborat Innovat Ctr Biomfg Technol, Shanghai 200237, Peoples R China;[6]Oak Ridge Natl Lab, Chem Sci Div, Oak Ridge, TN 37830 USA

年份：2018

卷号：551

起止页码：174

外文期刊名：COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS

收录：;EI(收录号：20182005199151);WOS:【SCI-EXPANDED(收录号:WOS:000433219900021)】；

基金：This research was supported by National Natural Science Foundation of China (Grant Nos. 51574125, 21203063) and the 863 program (Grant No. 2013AA064403), and the Fundamental Research Funds for the Central Universities of China. We are grateful for HZB on allocating beam time.

语种：英文

外文关键词：Biosurfactant; Surfactin; Alkyl benzenesulfonate; Binary surfactant system; Micellization; Small angle neutron scattering

摘要：Micellization mechanism of biosurfactant/synthetic surfactant systems is essential in predicting their industrial applications. Biosurfactant, [Glu1, Asp5]-C15 surfactin, mixing with three isomers of sodium cetyl benzenesulfonate (SCBS) with benzenesulfonate attached at the 2nd, 5th, 8th carbon on the alkyl chain (abbreviated as 2-SCBS, 5-SCBS, and 8-SCBS), constituted the binary biosurfactant/synthetic surfactant systems in this work. Effects of mixing ratios, temperature, and hydrophobic structures of SCBS on micellization process were investigated by surface tensiometry, steady state fluorescence measurements, dynamic light scattering, and small angle neutron scattering. The results showed that at 60. synergism in micellization occurred in surfactin/2-SCBS and surfactin/5-SCBS binary systems, while antagonism appeared in surfactin/8-SCBS binary systems. Molecular interaction in mixed micelle at 60. turned from strong attractive to strong repulsive with the benzenesulfonate moving from the end to the middle of the alkyl chain. Surfactin exhibited weak interaction with both 5-SCBS and 8-SCBS at 25 degrees C. Mixed surfactin/2-SCBS micelles were formed in spherical cylinders with more hydrophobic core and within 66 A. Mixed surfactin/5-SCBS micelles and mixed surfactin/8-SCBS micelles showed similar morphology evolutions at 25 degrees C, long elliptical cylinders transformed into small spherical cylinder by reducing both length and radius ratio of cross section with increasing surfactin mole fraction.