Dresden 2014 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 54: Poster Session 3
CPP 54.4: Poster
Donnerstag, 3. April 2014, 15:00–19:00, P2
Diffusive mechanism of linear and branched molecules translocation through the "hairy" microchannels — •Irina Neratova1,2, Torsten Kreer1, and Jens-Uwe Sommer1,2 — 1Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, D-01069, Dresden, Germany — 2Technische Universität Dresden, Institut für Theoretische Physik, Zellescher Weg 17, D-01069, Dresden, Germany
Polymer brush-covered or "hairy" channels have attracted a lot of attention in recent years for both engineering and biomedical applications. In recent years interest to polymer brush-covered nanochannels is based mostly on microfluidic processes which are intrinsic to living organisms. Many works have been done to understand the processes of opening and closing of the nanochannels. In our project we raise the question about the transport of the molecules through the "hairy" channels. By means of Molecular Dynamics simulations we study the flow dynamics in a microchannel. In particular we investigated the influence of the architecture of macromolecules with the same molecular weight on their ability to pass through a brush-covered channel driven by Poisseuille flow. The simulations indicate that flow conditions cause the speeding up of the transport of molecules with linear architecture through the nanochannel making their velocity comparable with fast but non-draining 30-arms stars. The simulation results reveal that stretching-collapse mechanism of linear molecules in the flow helps to diffuse freely through the pore while the large molecules like 5-, 10-, 15-arms stars are trapped in the channel.