Mixing Behavior of the Binary Monolayers of Fatty Acids Based on Their Cohesive Energy Differences
Mixing Behavior of the Binary Monolayers of Fatty Acids Based on Their Cohesive Energy Differences
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基于内聚能差异的脂肪酸二元单分子层的混合行为
DOI：
10.1021/acs.langmuir.2c02130
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发表时间：
2022
期刊：
影响因子：
3.9
通讯作者：
Yushi Oishi
中科院分区：
文献类型：
--
作者：
Takamasa Ishikawa;Miyuki Kuramori;Takayuki Narita;Yushi Oishi
利用原子力显微镜(AFM)研究了饱和脂肪酸双分子膜的表面粗糙度和高度差对其混合行为的影响。AFM观察表明，(棕榈酸/花生酸)和(花生酸/甘油酸)混合单分子膜在脂肪酸之间存在四个亚甲基差异，处于分子混合状态。此外，具有6个亚甲基差异的硬脂酸/甘油酸混合单分子膜处于相分离状态。从目前和以前的研究结果可以清楚地看出，脂肪酸之间结合能的差异是决定脂肪酸混合单分子膜的分子聚集状态是处于分子混合状态还是相分离状态的一个重要因素。在293K的亚相温度下，结合能差的边界值约为2.5kJ·mol-1。
The morphology involving the height difference and the surface roughness of the binary monolayers of saturated fatty acids were evaluated using atomic force microscopy (AFM) to investigate the mixing behavior of their monolayers. AFM observations revealed that the mixed monolayers of (palmitic acid/arachidic acid) and (arachidic acid/lignoceric acid), which had four methylene group differences between fatty acids, were in a molecularly mixed state. Further, the mixed monolayer of (stearic acid/lignoceric acid), which had six methylene group differences, was in a phase-separated state. From the results of the present and previous studies, it became clear that the difference in the cohesive energy between fatty acids, which corresponds to the enthalpy difference, was an important factor in determining whether the molecular aggregation state of a fatty acid mixed monolayer was in a molecularly mixed or phase-separated state. Moreover, the boundary value of cohesive energy difference was approximately 2.5 kJ mol–1at a subphase temperature of 293 K.