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[脂质双分子层膜本底电导率的极化子机制]

[Polaron mechanism of background conductivity of lipid bilayer membranes].

作者信息

Pastushenko V F

出版信息

Biofizika. 1984 Jan-Feb;29(1):70-2.

PMID:6713009
Abstract

The difference between standard chemical potentials of polaron and ion in electrolyte solution is represented as a sum of Born energy and surface free energy of the polaron. The reasons why surface tension of polaron should be smaller than that of bulk phases boundary are mentioned. Surface tension of the polaron sigma 1 was shown to be equal to 10(-2) J/m2 for typical BLM with specific resistance 10(8) ohm cm2. For such BLM average value of polaron radius constitutes 0.58 nm which corresponds to 28 water molecules per polaron. Another experimentally verifiable result is the correlation (formula; see text) = (epsilon m) (gamma is distribution coefficient of ions between BLM and electrolyte solution). This correlation was obtained assuming independence of sigma 1 on epsilon m.

摘要

电解质溶液中极化子和离子的标准化学势之差表示为极化子的玻恩能量和表面自由能之和。文中提到了极化子表面张力应小于本体相边界表面张力的原因。对于电阻率为10⁸Ω·cm²的典型双分子层脂质膜(BLM),极化子的表面张力σ₁被证明等于10⁻²J/m²。对于这种BLM,极化子半径的平均值为0.58nm,相当于每个极化子有28个水分子。另一个可通过实验验证的结果是相关性(公式;见正文)=(εm)(γ是离子在BLM和电解质溶液之间的分配系数)。该相关性是在假设σ₁与εm无关的情况下得到的。

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