Koenderink G H, Zhang H, Lettinga M P, Nägele G, Philipse A P
Van't Hoff Laboratory, Debye Institute, Utrecht University, 3584 CH Utrecht, The Netherlands.
Phys Rev E Stat Nonlin Soft Matter Phys. 2001 Aug;64(2 Pt 1):022401. doi: 10.1103/PhysRevE.64.022401. Epub 2001 Jul 24.
We demonstrate that tracer/host size asymmetry and electrostatic interactions strongly affect rotational self-diffusion in binary mixtures of charged colloidal tracer and host spheres. Tracer diffusion coefficients, measured with time-resolved phosphorescence anisotropy, are compared with calculations of rotational diffusion including two- and three-particle hydrodynamic interactions. We also show that the inverse dependence of the rotational diffusion coefficient on the suspension viscosity is approached only at large size ratios.
我们证明，示踪剂/主体尺寸不对称性和静电相互作用强烈影响带电胶体示踪剂与主体球体二元混合物中的旋转自扩散。通过时间分辨磷光各向异性测量的示踪剂扩散系数，与包括两粒子和三粒子流体动力学相互作用的旋转扩散计算结果进行了比较。我们还表明，只有在大尺寸比时，旋转扩散系数对悬浮液粘度的反比关系才会出现。
