Adsorption transition of a polyelectrolyte on a high-dielectric charged substrate.
The behavior of a polyelectrolyte adsorbed on a charged surface of high-dielectric constant is studied by both Monte Carlo simulation and analytical methods. It is found that in a low ionic strength medium, the transition is first-order with the repulsive charged surface. The surface monomer density, which is the order parameter of the adsorption transition, follows a linear relation with surface charge density. It indicates that the polyelectrolyte is compressed on the substrate without any conformational change before the desorption. Finally, a different scaling law for the layer thickness is derived and verified by simulation.
Cheng
Chi-Ho
CH
Department of Physics and Center for Complex Systems, National Central University, Taiwan. phcch@phy.ncu.edu.tw
Lai
Pik-Yin
PY