干燥悬浮液中裂缝的动力学

Dynamics of fracture in drying suspensions.

作者信息

Dufresne E R, Stark D J, Greenblatt N A, Cheng J X, Hutchinson J W, Mahadevan L, Weitz D A

机构信息

DEAS, Department of Physics, and Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, USA.

出版信息

Langmuir. 2006 Aug 15;22(17):7144-7. doi: 10.1021/la061251+.

DOI:10.1021/la061251+

PMID:16893207

Abstract

We investigate the dynamics of fracture in drying films of colloidal silica. Water loss quenches the nanoparticle dispersions to form a liquid-saturated elastic network of particles that relieves drying-induced strain by cracking. These cracks display intriguing intermittent motion originating from the deformation of arrested crack tips and aging of the elastic network. The dynamics of a single crack exhibits a universal evolution, described by a balance of the driving elastic power with the sum of interfacial power and the viscous dissipation rate of flowing interstitial fluid.

摘要

我们研究了胶体二氧化硅干燥薄膜中的断裂动力学。水分流失使纳米颗粒分散体猝灭，形成颗粒的液体饱和弹性网络，该网络通过开裂来缓解干燥引起的应变。这些裂纹呈现出有趣的间歇运动，其源于停滞裂纹尖端的变形和弹性网络的老化。单个裂纹的动力学表现出一种普遍的演化，由驱动弹性功率与界面功率之和以及流动间隙流体的粘性耗散率之间的平衡来描述。