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DY: Fachverband Dynamik und Statistische Physik

DY 29: Poster II

DY 29.26: Poster

Donnerstag, 28. Februar 2008, 16:00–18:00, Poster C

Conformational mechanics of polymer adsorption transitions at attractive substrates — •Monika Möddel, Michael Bachmann, and Wolfhard Janke — Institut für Theoretische Physik, Universität Leipzig

Conformational phases of a semiflexible off-lattice homopolymer model near an attractive substrate are investigated by means of multicanonical simulations. In our model, nonbonded pairs of monomers as well as monomers and the substrate interact via attractive van der Waals forces in addition to the chain’s bending energy. We analyse thermal fluctuations of energetic and structural quantities and adequate docking parameters as a function of the temperature. Introducing a solvent parameter, that is related to the strength of the surface attraction, we discuss aspects of the solubility-temperature phase diagram. Apart from the main phases of adsorbed and desorbed conformations there is also a variety of other phase transitions such as the energetic transitions from filmlike surface-layer conformations to compact surface-attached globular structures.