DISTRIBUTION OF THE INTERFACIAL POTENTIAL DROP IN A SITUATION WHEN IONIC SOLUTION COMPONENTS ENTER A SURFACE-LAYER OF FINITE THICKNESS WITH FIXED SPACE-CHARGEстатья
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Дата последнего поиска статьи во внешних источниках: 15 июля 2021 г.
Аннотация:An interface model was discussed where an interfacial region of finite dimensions contains a fixed space charge as well as solvent molecules and ions in equilibrium with the electrolyte. It was shown that the potential profile generally will be drastically different from that described by Gouy - Chapman - Stern theory when such an ''adsorption'' layer is present in the system. The characteristics of this adsorption layer were analyzed as functions of the system parameters: the layer thickness, fixed-charge density in the layer, chemical potential difference of the ions between the layer and bulk solution, and surface charge density at the inner boundary of the adsorption layer (relative to the electrolyte solution). Plots of potential distribution in the system were reported for different values of these parameters. It was shown that the qualitative shape of the potential distribution is determined by two factors: the ratio between layer thickness and screening length within the layer, and the ratio between the layer's space charge density and the ionic charge density that would be set up within the layer if it contained no fixed charge. It was shown that Gouy - Chapman theory is admissible for a description of thin layers. When considering ''thick'' layers it will be convenient to split the solution/layer/substrate system into two separate interfaces.