Berlin 2012 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 32: Soft Matter II
DY 32.4: Talk
Friday, March 30, 2012, 10:45–11:00, MA 144
Influence of Striped Surface-Inhomogeneities on the Conformations of a Single Self-Interacting Polymer near an Attractive Substrate — •Monika Möddel1, Wolfhard Janke1, and Michael Bachmann2 — 1Institut für Theoretische Physik, Universität Leipzig — 2Center for Simulational Physics, The University of Georgia, Athens, GA 30602, U.S.A.
Specific interaction between a polymer and a solid substrate is a key ingredient of the problem of how the polymer can recognize a target surface with a specific pattern. The statistics of homopolymer adsorption onto homogeneously attractive substrates has been studied quite extensively in the past. In our own recent studies [1,2], we investigated thermal fluctuations of energetic and structural quantities to identify a variety of pseudophases of a semiflexible off-lattice homopolymer for a range of different surface attraction strengths and temperatures and complemented this by a microcanonical analysis. By slowly “switching on” a striped surface potential we now study how this conformational behavior is modified and the collapse, freezing, adsorption and surface-recognition of an individual chain are related. The width of the stripe is also varied to some extent since it turns out to have a considerable influence. Shape anisotropy is discussed as well. In all cases studied, the adsorption and the recognition are found to be well-separated. The data are obtained by parallel tempering Monte Carlo simulations.
[1] M. Möddel, M. Bachmann, and W. Janke, J. Phys. Chem. B 113, 3314 (2009); [2] M. Möddel, W. Janke, and M. Bachmann, Phys. Chem. Chem. Phys. 12, 11548 (2010); Macromolecules, 44, 9013 (2011).