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Langmuir. 2006 Oct 24;22(22):9121-8.

Depletion interaction mediated by a polydisperse polymer studied with total internal reflection microscopy.

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1
Forschungszentrum Jülich, Institut für Festkörperforschung, Weiche Materie, 52425 Jülich, Germany.

Abstract

Total internal reflection microscopy (TIRM) was applied to measure depletion forces between a charged colloidal sphere and a charged solid wall induced by dextran, a nonionic nonadsorbing polydisperse polysaccharide. The polymer size polydispersity is shown to greatly influence the depletion potential. Using the theory for the depletion interaction due to ideal polydisperse polymer chains, we could accurately describe the experimental data with a single adjustable parameter.

PMID:
17042519
DOI:
10.1021/la061657m
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