文献类型：期刊文献

英文题名：Phase behavior and microstructures of the Gemini (12-3-12,2Br-)-SDS-H2O ternary

作者：Shang, Yazhuo[1]; Liu, Honglai[1]; Hu, Ying[1]; Prausnitz, John M.[2]

机构：[1] The State Key Laboratory of Chemical Engineering, Department of Chemistry, East China University of Science and technology, Shanghai, 200237, China; [2] Department of Chemical Engineering, University of California, Berkeley, Lawrence Berkeley National Laboratory, Berkeley, CA94720, United States

年份：2007

卷号：294

期号：1-3

起止页码：203

外文期刊名：Colloids and Surfaces A: Physicochemical and Engineering Aspects

收录：EI(收录号：20070610414584)

语种：英文

外文关键词：Etching - Micelles - Microstructure - Phase diagrams - Surface active agents - Transmission electron microscopy

摘要：Phase behavior and microstructures have been investigated for aqueous mixtures of cationic Gemini surfactant (12-3-12,2Br-) and anionic surfactant sodium dodecyl sulfate (SDS) using freeze-etching and negative-staining and with transmission electron microscopy (TEM). The phase diagram shows different regions characterized by different microstructures. Most of the regions are occupied by multi-lamellar phases in which vesicles coexist with micelles when the solutions are dilute. The multi-lamellar vesicles have higher stability because of their special structures. The ratio of vesicles to micelles varies with concentration and composition of the mixed-surfactant solutions. At higher surfactant concentrations, we observe other phases: the lamellar phase, anisotropic phase, aqueous two-phase system (ATPS), rod-like micelle phase, as well as other unique microstructures such as cylindrical micelles formed by short rod-like micelles, and porous morphology. Observations are reported for the transformation among different phases, especially from rod-like to spherical micelles. ? 2006 Elsevier B.V. All rights reserved.