Modeling diffusion of adsorbed polymer with explicit solvent

Tapan G. Desai, Pawel Keblinski, Sanat K. Kumar, Steve Granick

Research output: Contribution to journalArticlepeer-review

Abstract

Computer simulations of a polymer chain of length N strongly adsorbed at the solid-liquid interface in the presence of explicit solvent are used to delineate the factors affecting the N dependence of the polymer lateral diffusion coefficient, D. We find that surface roughness has a large influence, and D scales as D∼N-x, with x3/4 and x1 for ideal smooth and corrugated surfaces, respectively. The first result is consistent with the hydrodynamics of a "particle" of radius of gyration RG∼Nν (ν=0.75) translating parallel to a planar interface, while the second implies that the friction of the adsorbed chains dominates. These results are discussed in the context of recent measurements.

Original languageEnglish (US)
Article number218301
JournalPhysical review letters
Volume98
Issue number21
DOIs
StatePublished - May 21 2007

ASJC Scopus subject areas

  • General Physics and Astronomy

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