Regensburg 2013 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 17: Soft matter
DY 17.7: Vortrag
Mittwoch, 13. März 2013, 11:30–11:45, H47
Polymer statistics in an attractive sphere — Handan Arkin1,2 and •Wolfhard Janke1 — 1Institut für Theoretische Physik, Universität Leipzig, Germany — 2Department of Physics Engineering, Faculty of Engineering, Ankara University, Turkey
We analyze the structural behavior of a single polymer chain inside an attractive sphere. Our model is composed of a coarse-grained polymer governed by 12-6 Lennard-Jones interactions of the monomers and an attractive sphere potential which follows by integrating the monomer-monomer interaction over the (inner) surface of the sphere. By means of extensive multicanonical Monte Carlo simulations it is shown that the system exhibits a rich phase diagram in the adsorption strength-temperature (є−T) plane ranging from highly ordered, compact to extended, random coil structures and from desorbed to partially or even completely adsorbed conformations. These findings are identified with different energetic and structural observables including invariant shape parameters such as the asphericity that characterizes the average conformation of the polymer. The resulting phase diagram in the є−T plane is compared with that for a polymer adsorbing to a plane, attractive substrate obtained previously by Möddel, Bachmann, and one of the authors.
H. Arkin and W. Janke, Phys. Rev. E 85, 051802 (2012); J. Phys. Chem. B 116, 10379 (2012); Eur. Phys. J. – Special Topics (in print).