Phenomena of the specific interaction of metal with solvent and constituents of the adsorption potential dropстатья
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Дата последнего поиска статьи во внешних источниках: 27 мая 2015 г.
Аннотация:Using mercury, the gallium metals, and faces of monocrystalline silver in water as an example, it is shown that, when comparing interfaces between metals and solutions of surface-inactive electrolytes for different metals in identical solutions, one should take into account the specificity of not only chemical, donor-acceptor, interaction but also the specificity of physical interaction of metal with solvent as well. The latter interaction is brought about by unequal electron density expansion beyond the ionic cores of the metals. Generally, allowance for the physical specificity of contacts may significantly change our ideas on the lyophilicity of a metal with respect to another metal, This is especially so if differences between the distance of closest approach of the solvent dipoles to the metal surface are rather appreciable and the differential capacitances of the compact layer at zero charge are high. It is shown that physical and chemical specificity of contact can be distinguished by normalizing charge dependences of the differential capacitance of the compact part of the electrical double layer for an identical for various metals distance of closest approach of the solvent dipoles to the ionic core. For mercury and metals of the gallium subgroup in various solvents, the possibility of dividing the total adsorption potential drop into individual constituents with allowance for both physical and chemical specificity of contact is considered.