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Descriptif technique :

Optical microscope with magnitude x2, photography of the silica thin film coated on a Si wafer.

Technique de réalisation/Apport scientifique :

A 400-500 nm thick mesoporous hybrid silica coating was obtained by combining the sol-gel process and dip-coating technique. During template removal and thermal treatment, cracks appear in zones of non-uniform thickness, resulting in an astonishing, colorful reflection of light. The surface energy, adhesion to the substrate, and chemical composition of the film determine the morphology of the cracks.

Provenance : ENS de Lyon, Laboratoire de Chimie