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Mixing Behavior in Binary Anionic Gemini Surfactant–Perfluorinated Fatty Acid Langmuir Monolayers
Langmuir ( IF 3.7 ) Pub Date : 2017-09-19 00:00:00 , DOI: 10.1021/acs.langmuir.7b02585 Jeveria Rehman 1 , David Sowah-Kuma 1 , Amy L. Stevens 1 , Wei Bu 2 , Matthew F. Paige 1
Langmuir ( IF 3.7 ) Pub Date : 2017-09-19 00:00:00 , DOI: 10.1021/acs.langmuir.7b02585 Jeveria Rehman 1 , David Sowah-Kuma 1 , Amy L. Stevens 1 , Wei Bu 2 , Matthew F. Paige 1
Affiliation
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The miscibility and film structure of mixed Langmuir monolayer films composed of an anionic gemini N,N,N′,N′-dialkyl-N,N′-diacetate ethylenediamine surfactant (Ace(12)-2-Ace(12)) with perfluorotetradecanoic acid (C13F27COOH; PF) have been investigated using a variety of thermodynamic and structural characterization methods. The two film components were found to be miscible in monolayers at the air–water interface over a range of compositions and at all but the lowest surface pressures, with attractive interactions occurring between the two components. While pure PF monolayers formed crystalline lattices with hexagonal symmetry and with the surfactant tails oriented normal to the underlying water subphase, the pure gemini surfactant formed amorphous films with little tendency to orient at the subphase. In mixed films with mole ratios of PF:Ace(12)-2-Ace(12) < 2.5, the miscibility of the two components resulted in a nearly complete loss of crystallinity of the PF, though films at higher mole fractions of PF showed some residual crystallinity, albeit with lattice structures that were significantly different from that of pure PF. Miscibility and film structure in this mixed system are discussed in comparison with other mixed gemini surfactant systems in the literature as well as binary mixtures of phospholipids or monomeric fatty acids with PF.
中文翻译：
二元阴离子双子表面活性剂-全氟化脂肪酸Langmuir单层的混合行为
阴离子双子座N，N，N '，N'-二烷基-N，N'-二乙酸乙二胺表面活性剂（Ace（12）-2-Ace（12））与全氟十四烷酸组成的混合Langmuir单层膜的混溶性和膜结构酸（C 13 F 27COOH; PF）已使用多种热力学和结构表征方法进行了研究。发现这两种薄膜成分在一定范围的成分范围内以及在最低的表面压力下，在空气-水界面的单层中都是可混溶的，这两种成分之间发生了有吸引力的相互作用。当纯PF单层形成具有六边形对称性的晶格，且表面活性剂的尾巴垂直于下面的水子相定向时，纯双子表面活性剂形成的非晶态膜几乎没有取向于该子相的趋势。在摩尔比为PF：Ace（12）-2-Ace（12）<2.5的混合薄膜中，两种成分的混溶性导致PF的结晶度几乎完全丧失，尽管在PF摩尔分数较高的薄膜中显示一些残留的结晶度 尽管其晶格结构与纯PF显着不同。与文献中的其他混合双子表面活性剂系统以及磷脂或单体脂肪酸与PF的二元混合物相比，讨论了该混合系统中的混溶性和膜结构。
更新日期：2017-09-19
中文翻译：
二元阴离子双子表面活性剂-全氟化脂肪酸Langmuir单层的混合行为
阴离子双子座N，N，N '，N'-二烷基-N，N'-二乙酸乙二胺表面活性剂（Ace（12）-2-Ace（12））与全氟十四烷酸组成的混合Langmuir单层膜的混溶性和膜结构酸（C 13 F 27COOH; PF）已使用多种热力学和结构表征方法进行了研究。发现这两种薄膜成分在一定范围的成分范围内以及在最低的表面压力下，在空气-水界面的单层中都是可混溶的，这两种成分之间发生了有吸引力的相互作用。当纯PF单层形成具有六边形对称性的晶格，且表面活性剂的尾巴垂直于下面的水子相定向时，纯双子表面活性剂形成的非晶态膜几乎没有取向于该子相的趋势。在摩尔比为PF：Ace（12）-2-Ace（12）<2.5的混合薄膜中，两种成分的混溶性导致PF的结晶度几乎完全丧失，尽管在PF摩尔分数较高的薄膜中显示一些残留的结晶度 尽管其晶格结构与纯PF显着不同。与文献中的其他混合双子表面活性剂系统以及磷脂或单体脂肪酸与PF的二元混合物相比，讨论了该混合系统中的混溶性和膜结构。
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