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BP: Fachverband Biologische Physik
BP 35: Posters: Statistical Physics, Evolution, and Networks
BP 35.2: Poster
Thursday, March 25, 2010, 17:15–20:00, Poster B2
Systematic Microcanonical Analyses of Polymer Adsorption Transitions — •Monika Möddel1, Wolfhard Janke1 und Michael Bachmann2 — 1Institut für Theoretische Physik, Universität Leipzig — 2Institut für Festkörperforschung, Theorie II, Forschungszentrum Jülich
Regarding the advances in processing and manipulating molecules at solid substrates, an understanding of the cooperative effects of finite chains is particularly desirable. We investigate this problem focusing on the adsorption transition [1,2] of a single chain near an attractive substrate. This is conveniently and to our knowledge for the first time done by a detailed microcanonical analysis [2] of densities of states obtained by extensive multicanonical Monte Carlo computer simulations. A remarkable consequence of the convexity of the microcanonical entropy is that for short chains and strong surface attraction the transition is accompanied by a decrease of the microcanonical temperature with increasing energy. Since this is a characteristic physical effect it might not be ignored in analyses of cooperative macrostate transitions in finite systems.
[1] M. Möddel, M. Bachmann, and W. Janke, J. Phys. Chem. B 113, 3314 (2009).
[2] M. Möddel, M. Bachmann, and W. Janke, preprint.