Dresden 2014 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 39: The Collapsed State of Polymers: From Physical Concepts to Applications and Biological Systems (accompanying session, joint CPP/BP/DY)
BP 39.1: Vortrag
Donnerstag, 3. April 2014, 15:00–15:15, ZEU 250
Collapse and self-organization of polymer structures in poor solvent - A Monte Carlo Study — •Marco Werner1,2, Christoph Jentzsch1,2, and Jens-Uwe Sommer1,2 — 1Leibniz-Institut für Polymerforschung Dresden, Germany — 2Technische Universität Dresden, Germany
We investigate poor solvent effects in polymer structures such as single polymer globules [1], collapsed polymer brushes as well as self-assembled lipid bilayer membranes [2] by using the bond-fluctuation model with explicit solvent. Focussing on the coil-to-globule transition of single polymer chains we show that even in the case of very poor solvent our coarse grained lattice model avoids freezing effects and preserves dynamic fluctuations at the polymer-solvent interface in contrast to corresponding implicit solvent models. We demonstrate that fluctuations will be necessary for a complete description of the force-extension curve during the unravelling process of a single polymer globule. In particular in the region of coexistence of collapsed and stretched part we observe a fluctuating ensemble of globules along the chain, which smooths the force-extension curve.
[1] C. Jentzsch, M. Werner, und J.-U. Sommer, J. Chem. Phys. 138 (9), 094902 (2013).
[2] J.-U. Sommer, M. Werner, und V. A. Baulin, Europhys. Lett. 98, 18003 (2012).