Shear-Induced Desorption of Isolated Polymer Molecules from a Planar Wall

Sarit Dutta, Kevin D. Dorfman, Satish Kumar

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

We use Brownian dynamics simulations with hydrodynamic interactions to reconcile the apparent contradictions in experiments on the effect of shear flow on desorption of polymers. Our simulations show that desorption is governed by an interplay between chain-wall attraction and wall-induced hydrodynamic repulsion. When adsorption is weak, the chains form large loops and tails that generate stronger hydrodynamic interactions in the presence of the imposed shear flow, causing longer chains to desorb faster than shorter ones. In contrast, when adsorption is strong, the chains adopt a flattened conformation, weakening hydrodynamic interactions and resulting in shorter chains with fewer sticking points desorbing faster than longer ones. (Figure Presented).

Original languageEnglish (US)
Pages (from-to)271-274
Number of pages4
JournalACS Macro Letters
Volume4
Issue number3
DOIs
StatePublished - Mar 17 2015

Bibliographical note

Publisher Copyright:
© 2015 American Chemical Society.

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