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Morphologies of electric-field-driven cracks in dried dispersions of ellipsoids
Megha Emerse1, Hisay Lama1, Madivala G Basavaraj2,3
1Department of Physics, IIT Madras, Chennai 600036, India.
Abstract:
We report an experimental and theoretical study of the morphology of desiccation cracks formed in deposits of hematite ellipsoids dried in an externally applied alternating current (ac) electric field. A series of transitions in the crack morphology is observed by modulating the frequency and the strength of the applied field. We also found a clear transition in the morphology of cracks as a function of the aspect ratio of the ellipsoid. We show that these transitions in the crack morphology can be explained by a linear stability analysis of the equation describing the effective dynamics of an ellipsoid placed in an externally applied ac electric field.
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