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. Author manuscript; available in PMC: 2010 Mar 3.
Published in final edited form as: Langmuir. 2009 Mar 3;25(5):3102–3107. doi: 10.1021/la801986k

Figure 1.

Figure 1

A) An oxidized cube of PDMS (each edge: 10 mm, 1:30 curing agent-to-base ratio in weight). B) Compression of the cube. C) An optical micrograph of crack patterns on the oxidized cube. Compression with significant friction at the contacts (top and bottom) yields a non-uniform tensile stress oriented perpendicular to the direction of compression; consequently, cracks were produced in the brittle oxidized layer. D) Relationship between the average crack spacing in the middle of the cubes (averaged from five cubes at each compression ratio) and the applied compressive strain.