Stokes friction coefficient of spherical particles in the presence of polymer depletion layers - Analytical and numerical calculations, comparison with experimental data
Stokes friction coefficient of spherical particles in the presence of polymer depletion layers - Analytical and numerical calculations, comparison with experimental data
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DOI：
10.1039/a603103j
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发表时间：
1997-01-07
期刊：
影响因子：
--
通讯作者：
Vincent, B
中科院分区：
文献类型：
--
作者：
Donath, E;Krabi, A;Vincent, B
计算了球形颗粒表面附近聚合物耗尽时的斯托克斯摩擦系数，为动态光散射数据的解释提供了理论基础。在准平坦牛顿近似下，得到了任意粘度分布的解析解。对Navier-Stokes方程的数值积分证实了近似解析解的广泛适用性。给出了指数型和阶梯型粘度分布的显式方程。为了比较实验和理论，给出了不同半径脂质体在110 kDa葡聚糖溶液中的动态光散射数据。首次获得了耗尽层驰豫效应的证据。这种弛豫有效地减小了小颗粒的耗尽层厚度。建议对松弛效应进行线性修正。
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 Navier-Stokes 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.