Dresden 2017 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 40: Colloids and Complex Fluids II (Joint Session CPP/BP/DY)
BP 40.5: Vortrag
Mittwoch, 22. März 2017, 11:45–12:00, ZEU 260
Entropic Interactions between Dendrimers and Impenetrable Surfaces — •Ron Dockhorn1,2, Stephan Meschede3, Martin Wengenmayr1,2, and Jens-Uwe Sommer1,2 — 1Leibniz Institute of Polymer Research Dresden, D-01069 Dresden, Germany — 2Technische Universität Dresden, Institute for Theoretical Physics, D-01069 Dresden, Germany — 3Institute for Physics, Humboldt-Universität zu Berlin, D-12489 Berlin, Germany
Monte Carlo simulations are performed to investigate depletion effects on dendrimers using the bond fluctuation model. Two different situations are investigated: The interaction between a single dendrimer against a hard wall and the interaction between two dendrimers. The simulations of the dendrimers are performed with implicit solvent as well as in a linear polymer matrix. The free energy landscape along the particular reaction coordinate is determined by Umbrella Sampling (WHAM algorithm) and compared to a mean-field approach. Both systems immersed in a polymer matrix show entropic attraction (depletion forces) depending on the length of the surrounding linear chains. Additionally, a spontaneous conformational change and rapid mixing caused by the strong interaction in the two dendrimers’ system can be noticed. These findings are aimed to understand the agglomeration and the coagulation processes of hyperbranched structures in drug-delivery systems in medical applications.