MONTE-CARLO STUDY OF ADSORPTION OF A POLYELECTROLYTE ONTO CHARGED SURFACES

By using off-lattice Monte Carlo simulations, the conditions of adsorp tion of a uniformly charged polyelectrolyte onto oppositely charged pl anar and spherical surfaces have been investigated. These conditions a re functions of the strength of the electrostatic interaction, Debye s creening length, chain length, and charge density and curvature of the surface. The adsorption can be tuned by using any one of these parame ters. The chain's conformation, adsorption energy and thickness of the adsorbed polymer are obtained under different adsorption conditions. We find the Monte Carlo simulation data to be in good agreement with t he theoretical prediction derived previously by using the assumptions of ground state dominance and separability. (C) 1998 American Institut e of Physics.