Properties of two-component Langmuir monolayer of single chain perfluorinated carboxylic acids with dipalmitoylphosphatidylcholine (DPPC)
Properties of two-component Langmuir monolayer of single chain perfluorinated carboxylic acids with dipalmitoylphosphatidylcholine (DPPC)
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DOI：
10.1016/j.colsurfb.2004.06.013
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发表时间：
2005-04-10
影响因子：
5.8
通讯作者：
Shibata, O
中科院分区：
文献类型：
--
作者：
Nakahara, H;Nakamura, S;Shibata, O
得到了四种不同的全氟羧酸（fcv）的双组分单层的表面压力(pi)-和表面电位(Delta V)-面积(A)等温线；采用Wilhelmy法、离子化电极法、荧光显微镜和原子力显微镜，研究了在298.2 K下0.15M NaCl （pH 2.0）底物溶液中，全氟十二烷酸：FC12、全氟十四烷酸：FC14、全氟十六烷酸：FC16、全氟十八烷酸：FC18与二棕榈酰基磷脂酰胆碱（DPPC）的关系。用可加性规则对这些系统上的双组分单层数据进行了分析。假设有规则的表面混合物，采用可描述双组分具有混相组分的单层的坍塌压力的Joos方程来表示单层的混相状态，并计算了相互作用参数和相互作用能。新发现氟碳化合物与DPPC的混相或不混相取决于氟碳部分的链长增量。即FC12/DPPC单层完全混相，FC14/DPPC、FC16/DPPC (0
The surface pressure (pi)- and the surface potential (Delta V)-area (A) isotherms were obtained for two-component monolayers of four different perfluorocarboxylic acids (FCns; perfluorododecanoic acid: FC12, perfluorotetradecanoic acid: FC14, perfluorohexadecanoic acid: FC16, perfluorooctadecanoic acid: FC18) with dipalmitoylphosphatidylcholine (DPPC) on substrate solution of 0.15M NaCl (pH 2.0) at 298.2 K as a function of compositions in the mixtures by employing the Wilhelmy method, the ionizing electrode method, the fluorescence microscopy, and the atomic force microscopy. The data for the two-component monolayers on these systems were analyzed in terms of the additivity rule. Assuming a regular surface mixture, the Joos equation which allows one to describe the collapse pressure of a two-component monolayer with miscible components was used to declare the miscibility of the monolayer state, and an interaction parameter and an interaction energy were calculated. The new finding was that FCns and DPPC are miscible or immiscible depending on chain length increment of fluorocarbon part. That is, FC12/DPPC monolayer was perfectly miscible, and FC14/DPPC, and FC16/DPPC (0