Electrocapillary Properties of Hydrogels
Keywords:hydrogel, ions, surface tension
Based on the thermodynamic theory of electrocapillarity, a formula has been obtained that relates the surface tension coefficient of a hydrogel and the surface concentration of ionic impurities in it. The relative coefficients of surface tension in a hydrogel on the basis of hydroxypropyl cellulose with ionic impurities of chlorides of Group I alkali metals (Li, Na, K, Rb, and Cs) have been experimentally determined. The obtained formula is used to calculate the relative surface concentrations of ions in the corresponding samples. It is shown that the surface tension coefficient and the surface concentration of ions depend on the size of ions, and those dependences are non-monotonic. A mechanism responsible for this non-monotonicity has been proposed.
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