ELECTROSTATIC INTERACTION BETWEEN 2 CHARGED GEL LAYERS

Analysis of the effect of the distance between two plates with thick g el layers on the Stern potential and disjoining pressure has shown tha t the interface potential difference inside of the gel layer results i n a dependence which should be taken into account when further develop ing the DLVO theory. Analysis of the electrostatic interaction is base d on combining the model of the porous double layer at the oxide-solut ion interface (first introduced by J. Lyklema) and that of charge regu lation. Treatment of the electrostatic interaction involving the exten ded model of the porous double layer is of particular importance in th e study the stability of biocolloids. Cell glycokalyx is permeable for ions; it has considerable thickness and carries a certain amount of i onogenic groups whose degree of dissociation is dependent on the thick ness of the electrolyte interlayer and on the potential distribution, thus being varied inside of the gel layer. The extended model of the p orous double layer makes it possible to take into account specific ele ctrosurface properties of the biological cells, contrary to the model used by Ohshima, where constancy of the charge is suggested. This fact makes the problem more complicated, since potential is varied across the gel layer and calculation of the charge distribution becomes neces sary.