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Issue 38, 2018
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Relaxation of surface-tethered polymers under moderate confinement

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Abstract

We study the relaxation of surface-tethered polymers in microchannels under moderate confinement (i.e. hRg, where h is the channel height and Rg is the radius of gyration of the polymer) by experiments with fluorescence-marked DNA molecules and coupled lattice-Boltzmann/molecular dynamics simulations. The determined scaling exponent suggests that the relaxation is dominated by Zimm-dynamics with significant intra-chain hydrodynamic interactions. The relaxation of the DNA molecules is slower in shallower channels, indicating a pronounced effect of confinement on the longest relaxation time. An experimental correlation is obtained for the longest relaxation time as a function of the molecular contour length and the channel height. Good agreement between the experimental and the simulation results is found.

Graphical abstract: Relaxation of surface-tethered polymers under moderate confinement

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Article information


Submitted
18 Jun 2018
Accepted
13 Sep 2018
First published
14 Sep 2018

Soft Matter, 2018,14, 7926-7933
Article type
Paper

Relaxation of surface-tethered polymers under moderate confinement

J. Hartmann, T. Roy, K. Szuttor, J. Smiatek, C. Holm and S. Hardt, Soft Matter, 2018, 14, 7926
DOI: 10.1039/C8SM01246F

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