Potential profile across a charged spherical shell as a model for a biological cell.

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  • Potential Profile Across a Charged Sphe

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Potential distribution across a charged membrane of a spherical shell of radius a, which serves as a model for a cell, is calculated on the basis of a membrane model that the membrane core is covered by an ion-penetrable surface charge layer of thickness d in which the membrane-fixed charges are distributed at a uniform density N. Curvature effects are found to become appreciable when ka_??_10 (k=Debye-Hiickel parameter). When kd_??_5, the potential far inside the surface charge layer is almost equal to the Donnan potential. When it ka>>1 and kd>>1, the surface potential (the potential at the boundary between the outer surface charge layer and the surrounding solution) becomes half the Donnan potential. The surface potential becomes identical to the Gouy-Chapman double layer potential as d→0 with the product Nd kept constant.

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  • 膜

    膜 14 (1), 84-87, 1989

    日本膜学会

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