We consider a semi-flexible chain adsorbed on a wall by a constant external field, h, or a short-range surface potential, Vs. When the amplitude of h or V is decreased the system undergoes an unbinding transition; the properties of such transitions are studied here through various analytical and numerical methods (Flory approximation, scaling arguments, transfer matrix methods and Monte Carlo simulations). In particular, we obtain a general form for the entropy reduction (“steric interactions„) for constrained chains. The unbinding transition from an attractive Vsis shown to be discontinuous in the limit of very rigid chains.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)