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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Phase Behaviors and Self-Assembly Properties of Two Catanionic Surfactant Systems: C8F_(17)COOH/TTAOH/H2O and C8H_(17)COOH/TTAOH/H2O
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Phase Behaviors and Self-Assembly Properties of Two Catanionic Surfactant Systems: C8F_(17)COOH/TTAOH/H2O and C8H_(17)COOH/TTAOH/H2O

机译：两种阳离子表面活性剂体系C8F_（17）COOH / TTAOH / H2O和C8H_（17）COOH / TTAOH / H2O的相行为和自组装性能

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Two fatty acids, perfluorononanoic acid (C8F_(17)COOH) and nonanoic acid (C9H_(17)COOH). were mixed with a cationic hydrocarbon surfactant, tetradecyltrimethylammonium hydroxide (TTAOH), in aqueous solutions for comparative investigation. Phase behaviors of the two systems are quite different because of the special properties of the fluorocarbon chains. For the C8H_(17)COOH/TTAOH/H2O system, a single L_α phase region with phase transition from planar lamellar phase (L_α phase) to vesicle phase (L_(αv) phase) was observed. For the C8F_(17)COOH/TTAOH/H2O system, two single phases consisting of vesicles were obtained at room temperature. One is a high viscoelastic gel phase consisting of vesicles with crystalline state bialyers at the C8F_(17)COOH-rich side, which was confirmed by freeze-fracture transmission electron microscope (FF-TEM) and differential scanning calorimetry (DSC) measurements. With the increase of TTAOH proportion, another vesicle phase consisting of liquid state bilayers was observed after the two-phase region. The fluorosurfactant systems prefer to form vesicle bilayers than the corresponding hydrocarbon ones because of the rigid structure, the stronger hydrophobicity. and the larger volume of fluorocarbon chains.
机译：两种脂肪酸，全氟壬酸（C8F_（17）COOH）和壬酸（C9H_（17）COOH）。在水溶液中将其与阳离子烃表面活性剂氢氧化十四烷基三甲基氢氧化铵（TTAOH）混合以进行比较研究。由于碳氟化合物链的特殊性质，两个系统的相行为完全不同。对于C8H_（17）COOH / TTAOH / H2O系统，观察到单个L_α相区域，该区域具有从平面层状相（L_α相）到囊泡相（L_（αv）相）的相变。对于C8F_（17）COOH / TTAOH / H2O系统，在室温下获得了由囊泡组成的两个单相。一种是高粘弹性凝胶相，由在富含C8F_（17）COOH的一面具有晶态偏压的囊泡组成，这已通过冷冻断裂透射电子显微镜（FF-TEM）和差示扫描量热法（DSC）的测量得到证实。随着TTAOH比例的增加，在两相区之后观察到另一个由液态双层构成的囊泡相。含氟表面活性剂体系比相应的烃类更倾向于形成囊泡双层，因为其刚性结构，较强的疏水性。以及更大数量的碳氟化合物链。

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