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Wrinkles on PDMS in Oil
Oliver Graudejus (research scholar)
Department of Electrical Engineering
The picture shows wrinkles caused by the deposition of a thin film of gold on PDMS, which is the most widely used silicon-based organic polymer and is particularly known for its unusual flow properties. These wrinkles emerge when the compressive stress in the gold is larger than the critical strain for buckling and remain even when the gold is removed from the PDMS, as seen in the dark areas in the picture.