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CPP 95.2: Vortrag
Donnerstag, 19. März 2020, 15:15–15:30, ZEU 222
Polymer diffusion across lipidic nanochannels — •Reza Ghanbari1,3 and Raffaele Mezzenga1,2 — 1ETH Zurich, Department of Health Sciences and Technology, Schmelzbergstrasse 9, CH-8092 Zurich, Switzerland; — 2ETH Zurich, Department of Materials, Wolfgang-Pauli-Strasse 10, 8093 Zurich, Switzerland — 3Present: Adolphe Merkle Institute, University of Fribourg, Chemin des Verdiers, CH-1700 Fribourg, Switzerland
We present an experimental investigation on the diffusion of unfolded polymers in the triply-periodic water-channel network of inverse bicontinuous cubic phases. Depending on the chain size, our results indicate the presence of two different dynamical regimes corresponding to Zimm and Rouse diffusion. We support our findings by scaling arguments based on a combination of blob and effective-medium theories and suggest the presence of a third regime where dynamics is driven by reptation. Our experimental results also show an increasing behavior of the partition coefficient as a function of polymer molecular weight, indicative of a reduction of the conformational degrees of freedom induced by the confinement. Further, the molecular diffusion is discussed across different symmetries, that is, double diamond (Pn3m) symmetry and the double primitive (Im3m) cubic phase.