文献类型：期刊文献

英文题名：Effect of the spacer group of cationic gemini surfactant on microemulsion phase behavior

作者：Chen, Lifei[1]; Shang, Yazhuo[1]; Liu, Honglai[1]; Hu, Ying[1]

机构：[1]E China Univ Sci & Technol, Dept Chem, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, Adv Mat Lab, Shanghai 200237, Peoples R China

年份：2006

卷号：301

期号：2

起止页码：644

外文期刊名：JOURNAL OF COLLOID AND INTERFACE SCIENCE

收录：;EI(收录号：20063310067917);WOS:【SCI-EXPANDED(收录号:WOS:000239937700041)】；

语种：英文

外文关键词：gemini surfactant; microstructure; electrical conductivity; UV-visible absorbance; DLS

摘要：The phase behavior of a system of n-butanol/n-octane/water/cationic gemini surfactant, alkanediyl-alpha,omega-(dimethydodecyl-ammonium bromide) (12-n-12, n = 3, 4, 6), has been investigated by determination the pseudo-temary phase diagrams. The results have shown that the spacer group of gemini surfactant has a great effect on the phase behavior. The longer the spacer group for the geminis, the more similar the geminis properties to the traditional ones. The mixing content of surfactant and cosurfactant needed for forming microemulsions increases with the geminis' spacer group. The study has also shown that the shorter spacer group of geminis is favorable for the formation of higher ordered surfactant aggregates such as liquid crystals. Furthermore, the microstructures of each region for the studied systems have been investigated by electrical conductivity measurements, UV-visible absorbance spectra of pyrene probe, and dynamic light scattering (DLS). All the results are in accord with each other. DLS makes use of the sensitivity of DLS to structural changes and as expected the hydrodynamic diameter of the microemulsion droplet changes as the transformation of microemulsion microstructures take place. Moreover, the spherical and network structures of microemulsion were further verified by freezing-etching TEM. (c) 2006 Elsevier Inc. All rights reserved.