Berlin 2005 – scientific programme

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DY: Dynamik und Statistische Physik

DY 14: Complex Fluids

DY 14.7: Talk

Friday, March 4, 2005, 17:00–17:15, TU H3010

Lattice and continuous models of random heteropolymer adsorption — •Alexey Polotsky^1,2, Andreas Degenhard¹, and Friederike Schmid¹ — ¹Condensed Matter Theory, Fakultät für Physik, Universität Bielefeld — ²Institute of Macromolecular Compounds of the Russian Academy of Sciences, St.-Petersburg, Russia

Continuous and lattice models were used to study the adsorption of a random heteropolymer chain onto homo- and heterogeneous substrates. Different approaches were employed for the averaging over the sequence/surface disorder and the computation of the conformational average. In the continuous case, these are the replica trick and the reference system approach, respectively, whereas in the case of a lattice model partial annealing (the so called "Morita approximation") in combination with the generating function approach were applied. For the continuous model simple equations for the desorption-adsorption transition line were obtained. In the lattice models, the temperature dependency with respect to different conformational characteristics of the chain above the adsorption threshold were calculated. Some of the results were tested by a comparison with numerical lattice calculations.