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首页> 外文期刊>Physical chemistry chemical physics: PCCP >Intermolecular forces in lipid monolayers. Two-dimensional virial coefficients for pentadecanoic acid from micromanometry on spread monolayers at the air/water interface
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Intermolecular forces in lipid monolayers. Two-dimensional virial coefficients for pentadecanoic acid from micromanometry on spread monolayers at the air/water interface

机译：脂质单层中的分子间力。微观测压法在空气/水界面处扩散的单分子层上的十五烷酸的二维维里系数

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摘要

The lateral intermolecular forces between surfactant or lipid molecules in monolayers at interfaces are fundamental to understanding the phenomena of surface activity and the interactions of lipids in two-dimensional structures such as smectic phases and biomembranes. The classical approach to these forces is via the two-dimensional virial coefficients, which requires precise micromanometry on monolayer isotherms in the dilute gaseous region. Low pressure isotherms out to high surface areas in the two-dimensional gas range have been measured at 15, 25 and 30 °C for insoluble monolayers of n-pentadecanoic acid spread at the interface between water-vapour saturated air and a dilute aqueous solution of HC1. The data allow estimates of virial coefficients up to the third term. The second virial coefficients are compared with those predicted from a statistical mechanical model for monolayers of n-alkylcarboxylic acids treated as side-by-side parallel chains extended at the surface with the carboxyl head groups shielded in the water phase. The two sets coincide at ~26 °C, but the experimental estimates show a much larger dependence on temperature than the model predicts. Chain conformation effects, head group interactions and surface field polarization are discussed as possible temperature-dependent contributions to the lateral potentials of mean force.
机译：界面上单层表面活性剂或脂质分子之间的侧向分子间力对于理解表面活性现象以及二维结构（例如近晶相和生物膜）中脂质的相互作用至关重要。对这些力的经典方法是通过二维维里系数，这需要在稀薄气体区域中对单层等温线进行精确的显微测压。在15、25和30°C下测量了在水蒸气饱和空气和稀水溶液之间的界面处散布的n-十五烷酸不溶单层在二维气体范围内的低压等高线等温线HC1。数据允许估计到第三项的病毒系数。将第二维里系数与根据统计力学模型预测的正链烷基羧酸单层（作为并列平行链在表面延伸且羧基头基在水相中被屏蔽）处理的预测值进行比较。两组温度在〜26°C时重合，但实验估计值对温度的依赖性比模型预测的要大得多。讨论链构象效应，头基相互作用和表面场极化是温度对平均力横向电位的可能贡献。

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