Alkyl Chain Symmetry Effects in Mixed Cationic–Anionic Surfactant Systems
Alkyl Chain Symmetry Effects in Mixed Cationic–Anionic Surfactant Systems
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DOI：
10.1006/jcis.1996.0440
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发表时间：
1996-09
期刊：
影响因子：
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通讯作者：
O. Regev;A. Khan
中科院分区：
文献类型：
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作者：
O. Regev;A. Khan
摘要研究了表面活性剂中疏水尾的对称效应。(1)烃类表面活性剂链长相等，或(2)当一条链被全氟化时，表面活性剂链长不等，则参与表面活性剂的疏水性相等。研究了三种系统：(1)或(2)型对称系统和非对称系统。在稀区，烃类-氟碳混合单链反荷表面活性剂体系中观察到一些不寻常的结构变化。阳离子碳氢表面活性剂十二烷基三甲基氯化铵（DoTAC）和阴离子氟碳表面活性剂全氟壬酸钠（SPFN）均可分别溶于水，在高含水量时形成胶束溶液，在低含水量时形成液晶相。在低表面活性剂总浓度(C)下，以等摩尔比混合两种表面活性剂
Abstract We study symmetry effects of hydrophobic tails in mixed oppositely charged surfactant systems. Equal hydrophobicity of the participating surfactants is obtained either (1) by equal hydrocarbon surfactants chain length or (2) by unequal surfactants chain length when one chain is perfluorinated. Three systems were studied: symmetric system of type (1) or (2), and an asymmetric system. Some unusual structural changes are observed in a hydrocarbon–fluorocarbon mixed single-chain oppositely charged surfactant system in the dilute region. Both the cationic hydrocarbon surfactant, dodecytrimethylammoniumchloride (DoTAC), and the anionic fluorocarbon surfactant, sodium perfluorononanoate (SPFN), are separately soluble in water, forming micellar solutions at high water concentration followed by the formation of liquid crystal phases at low water content. Upon mixing the two surfactants in an equimolar ratio at low total surfactant concentration (C