Dresden 2020 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 50: Poster Session III
CPP 50.38: Poster
Tuesday, March 17, 2020, 14:00–16:00, P1C
Polymer adsorption in a micro channel — •Tobias A. Kampmann, Björn Lindhauer, and Jan Kierfeld — TU Dortmund University, Germany
Two entangled semiflexible polymers such as actin or DNA filaments confined to a channel exhibit at least three distinct scaling regimes of entropic repulsion. If the persistence length Lp exceeds the channel width d the entropic repulsion is ∼ Lp−1/3 and governed by deflections from the channel walls. If the polymer is more flexible such that the persistence length is smaller than the channel width, the entropic repulsion is governed by polymer blobs forming in confinement and scales ∼ Lp−1. In the presence of attractive interactions we find a single transition into a bundled phase upon increasing the potential strength. An intermediate entangled phase, where polymers are drawn into parallel alignment without bundling is absent. We conclude that parallel alignment and bundling of two confined polymers happen in a single transition. The results shed light on the self-assembly process of filament bundles in confinement.