文献类型：期刊文献

英文题名：Synergistic interactions in the mixed micelles of anionic amino acid surfactant with cationic gemini surfactant

作者：Wang, Xiaoyong[1];Yang, Chen[1]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China

年份：2021

卷号：162

外文期刊名：JOURNAL OF CHEMICAL THERMODYNAMICS

收录：;EI(收录号：20212910654824);WOS:【SCI-EXPANDED(收录号:WOS:000684873500001)】；

基金：The authors are grateful for the financial support from the National Natural Science Foundation of China (Grant 21573071) .

语种：英文

外文关键词：Amino acid surfactant; Gemini surfactant; Synergistic effect; Rubingh's model; Chaotropic ion

摘要：The synergistic interactions in the mixed micelles of anionic amino acid surfactant SMS with cationic gemini surfactant 12-3-12 and single-chain surfactant DTAB have been investigated. The fluorescence probe measurements reveal that the critical micelle concentration (CMC) and micellar micropolarity (I1/I-3Micelles) of SMS/12-3-12 and SMS/DTAB mixed micelles are always lied below the individual surfactants and reach the minimum values at equimolar compositions, which indicates the synergistic electrostatic attraction and hydrophobic interaction in the mixed micelles. Comparing with SMS/DTAB mixed micelles, the double charged headgroups and two alkyl chains lead 12-3-12 to have stronger synergistic interactions with SMS to form SMS/12-3-12 mixed micelles, which can be confirmed by the experimental values of CMC, I1/I-3Micelles, zeta potential, and the various micellar parameters calculated from Clint's and Rubingh's models. When sodium bromide (NaBr) is added, SMS/DTAB mixed micelles have more markedly decreased values of CMC and I1/I-3Micelles, but there are slight changes in SMS/12-3-12 mixed micelles. This result is ascribed to more tightly packed structure of SMS/12-3-12 mixed micelles than SMS/DTAB mixed micelles. The salt effect is also explained by the fact that the chaotropic ion Br- and the kosmotropic ion Na+ have different counterion specificities on two mixed micelles. (C) 2021 Elsevier Ltd.