Dresden 2020 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 95: Focus: Polymers under confinement II

CPP 95.2: Talk

Thursday, March 19, 2020, 15:15–15:30, ZEU 222

Polymer diffusion across lipidic nanochannels — •Reza Ghanbari^1,3 and Raffaele Mezzenga^1,2 — 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.