Stokes friction coefficient of spherical particles in the presence of polymer depletion layers Analytical and numerical calculations, comparison with experimental data

Autor:	A. Krabi, M. Nirschl, M. I. Zharkikh, V. M. Shilov, Brian Vincent, Edwin Donath
Rok vydání:	1997
Předmět:	Viscosity Classical mechanics Dynamic light scattering Depletion region Chemistry Newtonian fluid Particle Relaxation (physics) Mechanics Physical and Theoretical Chemistry Exponential function Numerical integration
Zdroj:	Journal of the Chemical Society, Faraday Transactions. 93:115-119
ISSN:	1364-5455 0956-5000
DOI:	10.1039/a603103j
Popis:	The Stokes friction coefficient has been calculated for the case of polymer depletion near a spherical particle surface, to provide a theoretical background for the interpretation of dynamic light scattering data. In a quasi-flat Newtonian approximation an analytical solution for arbitrary viscosity profiles was obtained. Numerical integration of the NavierStokes equation confirmed the large range of applicability of the approximate analytical solution. Explicit equations for an exponential and a step viscosity profile are given. To compare experiment and theory, dynamic light scattering data of liposomes with different radii in 110 kDa dextran are presented. For the first time evidence of a depletion layer relaxation effect has been obtained. This relaxation caused an effective reduction of the depletion layer thickness for small particles. A linear correction for the relaxation effect is suggested.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::d60dc1f9866ca1e1f196ff51682baa5f https://doi.org/10.1039/a603103j Zobrazit plný text záznamu