Volume 75, Number 6, September 2006
|Page(s)||929 - 935|
|Section||Condensed matter: structural, mechanical and thermal properties|
|Published online||09 August 2006|
How depletion affects sphere motion through solutions containing macromolecules
Forschungszentrum Jülich, Institut für Festkörperforschung 52425 Jülich, Germany
2 Department of Mechanical Engineering, University of Connecticut Storrs, CT 06269-3139, USA
Accepted: 24 July 2006
We present analytical expressions for the friction a sphere experiences when it moves through a macromolecular medium, showing the friction is strongly reduced compared to Stokes' law due to an entropic depletion effect. Depletion of macromolecules from the sphere surface leads to a low-viscosity layer around the sphere as compared to the viscosity in the crowded bulk. The resulting translational and rotational transport behaviour of a sphere through a polymer solution was analytically resolved using Stokes' stream function theory, showing the spheres apparently slip in the crowded medium of macromolecules. This slip facilitates particle diffusion.
PACS: 66.20.+d – Viscosity of liquids; diffusive momentum transport / 87.14.Ee – Proteins / 82.70.Dd – Colloids
© EDP Sciences, 2006
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