SOLUTION OF THE ASSOCIATIVE MEAN SPHERICAL APPROXIMATION FOR THE SHIELDED STICKY POINT ELECTROLYTE MODEL

An analytical solution of the two-density Omsteia-Zernike (OZ) equatio n with the associative mean spherical approximation (AMSA) closure is obtained for the shielded sticky point (SSP) electrolyte model. The mo del is presented by the dimerizing version of the restricted primitive electrolyte model with dimerization which occurs due to the site-site sticky interaction at distances less than the ionic hard-core diamete r. The present version of the AMSA is an extension of the associative MSA proposed recently [M. Holovko and Yu. Kalyuzhnyi, Mol. Phys. 73, 1 145 (1991)]. It is demonstrated that, in the limit of complete associa tion, the present two-density OZ equation reduces to the Chandler-Silb ey-Ladanyi equation. Predictions from the AMSA in this limit are compa red with those obtained by Monte Carlo simulations. (C) 1996 American Institute of Physics.