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Relaxation of surface-tethered polymers under moderate confinement

Abstract

We study the relaxation of surface-tethered polymers in microchannels under moderate confinement (i.e. h ∼ Rg, 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.

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Publication details

The article was received on 18 Jun 2018, accepted on 13 Sep 2018 and first published on 14 Sep 2018


Article type: Paper
DOI: 10.1039/C8SM01246F
Citation: Soft Matter, 2018, Accepted Manuscript
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    Relaxation of surface-tethered polymers under moderate confinement

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

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