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.
Eric R. Dufresne, Eric I. Corwin, N. A. Greenblatt, Jacqueline Ashmore, D. Y. Wang, A. D. Dinsmore, Ji‐Xin Cheng, X. Sunney Xie, John W. Hutchinson, David A. Weitz
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