Dynamics of fracture in drying suspensions
Dynamics of fracture in drying suspensions
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DOI：
10.1021/la061251
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发表时间：
2006-08-15
期刊：
影响因子：
3.9
通讯作者：
Weitz, D. A.
中科院分区：
文献类型：
--
作者：
Dufresne, E. R.;Stark, D. J.;Weitz, D. A.
我们研究了胶体二氧化硅干燥膜的断裂动力学。失水会淬灭纳米颗粒分散体，形成液体饱和的弹性颗粒网络，从而减轻干燥引起的开裂应变。这些裂纹表现出有趣的间歇运动，这些运动源于受阻裂纹尖端的变形和弹性网络的老化。单裂纹的动力学表现出普遍的演化，用驱动弹性力与界面力之和以及流动间质流体的粘性耗散率的平衡来描述。
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.