胶体玻璃中粗糙和光滑边界附近的老化。

Aging near rough and smooth boundaries in colloidal glasses.

机构信息

Department of Physics, Emory University, Atlanta, Georgia 30322, USA.

出版信息

J Chem Phys. 2017 Dec 14;147(22):224505. doi: 10.1063/1.5000445.

Abstract

We use a confocal microscope to study the aging of a bidisperse colloidal glass near rough and smooth boundaries. Near smooth boundaries, the particles form layers, and particle motion is dramatically slower near the boundary as compared to the bulk. Near rough boundaries, the layers nearly vanish, and particle motion is nearly identical to that of the bulk. The gradient in dynamics near the boundaries is demonstrated to be a function of the gradient in structure for both types of boundaries. Our observations show that wall-induced layer structures strongly influence aging.

摘要

我们使用共焦显微镜研究了双分散胶体玻璃在粗糙和光滑边界附近的老化过程。在光滑边界附近，颗粒形成层，与体相相比，边界附近的颗粒运动明显较慢。在粗糙边界附近，这些层几乎消失，颗粒运动几乎与体相相同。实验结果表明，边界处的动力学梯度是边界处结构梯度的函数，这两种类型的边界都存在这种情况。我们的观察结果表明，壁诱导的层结构强烈影响老化过程。