Journal
LANGMUIR
Volume 22, Issue 8, Pages 3622-3626Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la052343m
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When a thin film of initially hydrated gelatin is allowed to dry from the surface, Superficial changes in the structure of the material affect the local mechanical properties of the drying region. If the film is simultaneously Subjected to large strain deformation (above 20%), a periodic pattern of wrinkles appears on the surface of the gelatin along the length of the sample in the direction of the applied force. These wrinkles are uniformly distributed on the surface of the gelatin with a wavelength that is much smaller than the sample thickness, which changes with sample composition, aging time, and deformation rate. We investigate these patterns via in situ environmental scanning electron microscopy (ESEM) and provide a theory for their origin.
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