Abstract
The segregation of Na + and K + between liquid water and water absorbed in SiO 2 gel is experimentally studied by the addition of a wanted amount of highly porous SiO 2 to water solutions of NaCl and KCl. This study shows that in the high dilution limit K + segregates preferentially in absorbed water, while Na + does not. This specificity is ascribed to the different hydration energies and is lost at high concentrations where other factors (the raise of a negative surface electrostatic potential) facilitate segregation in absorbed water. The cosegregation of K + and Na + shows the simultaneous accumulation of K + and depletion of Na +, in strict analogy with biological systems.
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