Lamellar phase formation in catanionic mixtures of hydrogenated and fluorinated surfactants: a comparative study

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• 作者：Yuwen Shen (1) (2)
  Heinz Hoffmann (3)
  Lihua Jiang (1)
  Haitao Lin (1)
  Jingcheng Hao (2)
  Li Yang (1)
  
• 关键词：Lamellar phase ; Catanionic surfactant ; Fluorinated surfactant
• 刊名：Colloid & Polymer Science
• 出版年：2014
• 出版时间：January 2014
• 年：2014
• 卷：292
• 期：1
• 页码：67-75
• 全文大小：491 KB
• 作者单位：Yuwen Shen (1) (2)
  Heinz Hoffmann (3)
  Lihua Jiang (1)
  Haitao Lin (1)
  Jingcheng Hao (2)
  Li Yang (1)
  
  1. Institute of Agricultural Resources and Environment, Shandong Academy of Agricultural Sciences, Jinan, 250100, China
  2. Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan, 250100, China
  3. Bayreuther Zentrum für Kolloide und Grenzfl?chen, Universit?t Bayreuth, 95446, Bayreuth, Germany
  
• ISSN：1435-1536

文摘

The properties and phase behaviors of the catanionic mixtures consisting of tetradecyltrimetylammonium bromide (TTABr) and different anionic surfactants (i.e., sodium docanoate, C10HOONa; sodium laurate, C12HOONa; sodium perfluorodecanoate, C10FOONa) were examined, in particular when the molar mixing ratio in the aqueous solution was exactly 1:1. Although the three inspected systems have identical head groups and counterions, they exhibited very different lamellar (Lα) phases. When using the hydrogenated surfactants, the C10HOONa–TTABr system formed domain-like Lα/L1 two phases and the C12HOONa–TTABr system formed cream-like Lα/L1 two phases, respectively. In the case of the perfluorinated surfactant, the C10FOONa–TTABr system formed interdigitated and tilted Lα gel. The microstructures of the three Lα phases were characterized by polarized microscope, freeze-fracture transmission electron microscope, small angle X-ray scattering, and X-ray diffraction. The phase transition of the lamellar gel at different temperature was studied by differential scanning calorimetry and rheological measurements. The results elucidated the formation of the Lα phase in catanionic mixtures containing hydrogenated or fluorinated anionic surfactants with molar mixing ratio of 1:1.