Abstract
Organogel samples molded against structured Polydimethylsiloxane (PDMS) surfaces consisting of periodic ridge-valley and hexagonally packed fibrillar array patterns were separated employing a wedge adhesion test. We found that the complementary gel-elastomer interface can be up to 5 times stronger than a control, non-structured, gel-elastomer interface. The higher the surface feature (ridge/fibril) and the smaller the spacing between the features, the more is the energy required to separate the interface. The principal mechanisms for enhanced adhesion are crack-trapping by the structured interface and friction between interpenetrating features.
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This research was supported by the U.S. Department of Energy, Office of Basic energy Sciences, Division of Materials Sciences and Engineering under award DEFG02-07ER46463.
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Paretkar, D., Malhotra, P., Hui, CY., Jagota, A. (2017). Adhesion Enhancement of a Gel-Elastomer Interface by Shape Complementarity. In: Heepe, L., Xue, L., Gorb, S. (eds) Bio-inspired Structured Adhesives. Biologically-Inspired Systems, vol 9. Springer, Cham. https://doi.org/10.1007/978-3-319-59114-8_14
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