Gallium interface with solutions

However, one cannot reproduce the capacitance as a function of charge by combining this model with a constant solution capacitance. The explanation for the different capacitances found for different metals in the interface is usually considered to lie in the different interactions of solvent dipoles with different metals. Frum-kin et a/.34,87 have ascribed the observed larger capacitances for the gallium interface to the larger interaction of the dipoles of the solvent with the gallium surface. The present work does not invalidate this but mainly points out that a direct effect of the metal ought also to be considered. 

The value of the electric permittivity of water in the inner part of the double layer is commonly accepted as equal to 6. A much higher capacity of the inner layer at the Ga/solution interface was explained by the weak interaction of gallium with water, leading to a high value of As shown... 

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