Annular cracks in a colloidal film coating a fiber
Drying a colloidal suspension consists in the solvent evaporation leaving non-volatile particles on the substrates. During the concentration process, the material retraction is limited by the adhesion on the surface, leading to a strong tensile stress able to break the material. Here, we coated fibers with silica nanoparticles and we observed a particular pattern; annular cracks. It is then easy to measure the distance between them and to deduce how the mechanical stress is relaxed around these cracks.
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Interfacial textures on a film of silica nanoparticles
Publications about cracks:
|||F. Boulogne, L. Pauchard and F. Giorgiutti-Dauphiné, "Annular cracks of thin films of colloidal silica particles coating a fiber", EPL, vol. 102, no. 3, 2013, pp. 39002.
|||F. Boulogne, F. Giorgiutti-Dauphiné and L. Pauchard, "How to reduce the crack density in drying colloidal material?", in Oil Gas Sci. Technol. - Rev. IFP Energies nouvelles, 2013, pp. 397-404.
|||F. Boulogne, L. Pauchard and F. Giorgiutti-Dauphiné, "Effect of a non-volatile cosolvent on crack patterns induced by desiccation of a colloidal gel", Soft Matter, vol. 8, no. 32, 2012, pp. 8505–8510.