Department of Polymer Research, The Weizmann Institute of Science, Rehovoth, Israel.
J Gen Physiol. 1968 Jul 1;52(1):209-26.
Ion transport through monolayers and through several molecules of thick films at the mercury/water interface is discussed. The permeability of the monolayer is described by a rate constant, k(c). The permeability of a thin but not monomolecular film is expressed as a function of the thickness of the film, the diffusion coefficient of the permeant in the film, and the distribution coefficient between the film and the bulk of the solution. The rate constant k(c) is expressed in terms of absolute rate processes. In the absence of specific interactions, the activation energy is composed of three terms: (a) electrostatic interaction between the permeating ion and the charged monolayer, (b) monolayer compression work of forming a hole for passage of the ions, and (c) energy of boundary line formation between the monolayer and the hole. The contribution of the third term is especially marked in condensed monolayers. Ions are bound weakly to the monolayers of the dipolar ion lecithin, which complicates the transport problem in this system. The retardation of oxygen reduction by the lecithin monolayer is of particular interest.
讨论了汞/水界面处单层和数层厚膜中的离子传输。通过速率常数 k(c) 来描述单层的透过率。薄但非单分子膜的透过率表示为膜的厚度、膜中渗透物的扩散系数以及膜与溶液主体之间的分配系数的函数。速率常数 k(c) 用绝对速率过程表示。在没有特定相互作用的情况下，活化能由三个部分组成：(a) 渗透离子与带电单层之间的静电相互作用，(b) 形成离子通道的单层压缩功，以及 (c) 单层和孔之间边界线形成的能量。第三项的贡献在凝聚单层中尤为明显。离子与带电荷的双离子卵磷脂的单层弱结合，这使得该体系中的传输问题复杂化。卵磷脂单层对氧还原的阻滞作用特别有趣。
