扩散-扩散机制的近壁胶体动力学检验
Test of the diffusing-diffusivity mechanism using near-wall colloidal dynamics
摘要：
Chubynsky和Slater [PRL 113，098302，2014]提出的扩散-扩散率机制预测，在扩散率逐渐变化的环境中，位移分布变得非高斯，即使均方位移（MSD）随时间线性增长。在这里，我们报告单粒子跟踪测量的扩散胶体球附近的平面壁。由于当地的有效扩散系数是已知的，我们已经能够进行第一次直接测试，这种机制在非均匀介质中的扩散。
英文摘要：
The diffusing-diffusivity mechanism proposed by Chubynsky and Slater [PRL 113, 098302, 2014] predicts that, in environments where the diffusivity changes gradually, the displacement distribution becomes non-Gaussian, even though the mean-squared displacement (MSD) grows linearly with time. Here, we report single-particle tracking measurements of the diffusion of colloidal spheres near a planar wall. Because the local effective diffusivity is known, we have been able to carry out the first direct test of this mechanism for diffusion in inhomogeneous media.
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