文献类型：期刊文献

英文题名：Salt effect on the interactions between gemini surfactant and oppositely charged polyelectrolyte in aqueous solution

作者：Pi, Yingying[1]; Shang, Yazhuo[1]; Liu, Honglai[1]; Hu, Ying[1]; Jiang, Jianwen[2]

机构：[1]E China Univ Sci & Technol, Lab Adv Mat, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, Dept Chem, Shanghai 200237, Peoples R China;[3]Natl Univ Singapore, Dept Chem & Biomol Engn, Singapore 117576, Singapore

年份：2007

卷号：306

期号：2

起止页码：405

外文期刊名：JOURNAL OF COLLOID AND INTERFACE SCIENCE

收录：;EI(收录号：20065210334428);WOS:【SCI-EXPANDED(收录号:WOS:000243307700027)】；

语种：英文

外文关键词：gemini surfactant; polyelectrolyte; interactions; salt; alkali halide

摘要：The effect of alkali halides (NaBr, NaCl, KCl) on the interactions between the cationic gemini surfactant hexylene-1,6-bis(dodecyldimethylammonium bromide) (12-6-12) and the anionic polyelectrolyte sodium polyacrylate (NaPAA) in aqueous solution has been investigated by fluorescence emission spectroscopy, UV transmittance, zeta potential, and transmission electron microscopy (TEM). With increased addition of NaBr, a counterbalancing salt effect on the critical aggregation concentration (CAC) is observed. At low concentrations, NaBr facilitates the formation of micelle-like structures between surfactant and polyelectrolyte and results in a smaller CAC. At high concentrations, NaBr screens the electrostatic attraction between surfactant and polyelectrolyte and leads to a larger CAC. Upon the formation of micelle-like structures at high surfactant concentrations, the addition of NaBr is favorable for larger aggregates. The microstructure detected by TEM show that a global structure is generally formed in the presence of NaBr. The interactions also depend on ion species. Compared to NaBr, the addition of NaCl or KCl yields a smaller CAC. (c) 2006 Elsevier Inc. All rights reserved.