Publikation: Colloids dragged through a polymer solution : experiment, theory and simulation
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2008
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The Journal of Chemical Physics. American Institute of Physics (AIP). 2008, 129(8), 084902. ISSN 0021-9606. eISSN 1089-7690. Available under: doi: 10.1063/1.2965127
Zusammenfassung
We present microrheological measurements of the drag force on colloids pulled through a solution of 𝜆 -DNA (used here as a monodisperse model polymer) with an optical tweezer. The experiments show a drag force that is larger than expected from the Stokes formula and the independently measured viscosity of the DNA solution. We attribute this to the accumulation of DNA in front of the colloid and the reduced DNA density behind the colloid. This hypothesis is corroborated by a simple drift-diffusion model for the DNA molecules, which reproduces the experimental data surprisingly well, as well as by corresponding Brownian dynamics simulations.
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GUTSCHE, Christof, Friedrich KREMER, Matthias KRÜGER, Markus RAUSCHER, Rudolf WEEBER, Jens HARTING, 2008. Colloids dragged through a polymer solution : experiment, theory and simulation. In: The Journal of Chemical Physics. American Institute of Physics (AIP). 2008, 129(8), 084902. ISSN 0021-9606. eISSN 1089-7690. Available under: doi: 10.1063/1.2965127BibTex
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year={2008},
doi={10.1063/1.2965127},
title={Colloids dragged through a polymer solution : experiment, theory and simulation},
number={8},
volume={129},
issn={0021-9606},
journal={The Journal of Chemical Physics},
author={Gutsche, Christof and Kremer, Friedrich and Krüger, Matthias and Rauscher, Markus and Weeber, Rudolf and Harting, Jens},
note={Article Number: 084902}
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<dcterms:abstract xml:lang="eng">We present microrheological measurements of the drag force on colloids pulled through a solution of 𝜆 -DNA (used here as a monodisperse model polymer) with an optical tweezer. The experiments show a drag force that is larger than expected from the Stokes formula and the independently measured viscosity of the DNA solution. We attribute this to the accumulation of DNA in front of the colloid and the reduced DNA density behind the colloid. This hypothesis is corroborated by a simple drift-diffusion model for the DNA molecules, which reproduces the experimental data surprisingly well, as well as by corresponding Brownian dynamics simulations.</dcterms:abstract>
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