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| - Stability of Microfabricated High Aspect Ratio Structuresin Poly(dimethylsiloxane)
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| - The stability of structures microfabricated in soft elastomeric polymers is an important concern in mostapplications that use these structures. Although relevant for several applications, the collapse to theground of high aspect ratio structures (ground collapse) is still poorly understood. The stability of softmicrofabricated high aspect ratio structures versus ground collapse was experimentally assessed, and anew model of ground collapse involving adhesion was developed. Sets of posts with diameters from 0.36to 2.29 μm were fabricated in poly(dimethylsiloxane) and tested in air or immersed in water and ethanolto change the work of adhesion. The critical aspect ratio (the highest length-to-width ratio for which a postis not at risk of collapsing) was determined as a function of the diameter. The critical aspect ratio in airranged from 2 to 4 and increased with the diameter. Work of adhesion was found to be determinant forand inversely correlated to stability. These results highlight the role played by adhesion and offer thepossibility of improving stability by reducing the work of adhesion. The ground collapse model developedaccounted for the main features of structure stability. The results indicate that ground collapse can bea limiting factor in the design of soft polymer structures.
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