RUI: The origins of statistical variation of strength in micropatterned adhesive contacts

Adhesives based upon surface microstructure, inspired by the toepads of climbing animals, can transition between strong attachment and easy detachment. This allows for controllable and reusable temporary bonding. Differences in interfacial defect character among sub-contacts results in variation in local adhesive strength, with the statistical properties influencing the overall strength and stability of an adhesive patch. However, there are currently no relationships which enable prediction of the emerging statistics and resulting adhesive performance, based upon characteristic properties of the contacting surfaces. Accordingly, the following research objectives are identified: 1. Determine the adhesive strength of microstructured sub-contacts subject to variation in defect characteristics; 2. Characterize the statistical distribution of local adhesive strength as a function of the properties of the contacting bodies; 3. Predict the performance of a microstructured adhesive patch from the statistical properties of strength among sub-contacts. Educational objectives are also defined: 1. Increase the volume of independent research training provided to undergraduate students; 2. Enhance the depth of student research experiences through service learning and peer-mentoring; 3. Provide mentoring to high school students preparing for STEM degree program applications.