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Investigation of low-pressure adhesion performance of mushroom shaped biomimetic dry adhesives

Investigation of low-pressure adhesion performance of mushroom shaped biomimetic dry adhesives The effectiveness of biomimetic dry adhesives at different ambient pressures was investigated. Biomimetic dry adhesives have great potential for space applications but there have been few studies on how these adhesives perform in low-pressure environments. The best performing geometry for dry adhesives with respect to normal adhesion has previously been determined to be mushroom shaped fibers, but the pressure sensitivity of these designs has been unclear – with some groups reporting pressure dependent adhesion, and others claiming no effect. We have compared the microscale adhesion of mushroom shaped polymer fibers at different ambient pressures and have determined that suction cup effects are negligible for fibers with caps less than 16.4 μm in diameter. Further investigation in this work showed that a simple suction cup model provided estimates for the geometry requirements for a non-negligible suction cup effect and determined that the minimum cap radius for the 10 μm pillar diameter used in this study should be over 26 μm – past the dimension that can be successfully fabricated using this technology. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Adhesion Science and Technology Taylor & Francis

Investigation of low-pressure adhesion performance of mushroom shaped biomimetic dry adhesives

12 pages

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References (36)

Publisher
Taylor & Francis
Copyright
Copyright Taylor & Francis Group, LLC
ISSN
1568-5616
eISSN
0169-4243
DOI
10.1080/01694243.2012.701463
Publisher site
See Article on Publisher Site

Abstract

The effectiveness of biomimetic dry adhesives at different ambient pressures was investigated. Biomimetic dry adhesives have great potential for space applications but there have been few studies on how these adhesives perform in low-pressure environments. The best performing geometry for dry adhesives with respect to normal adhesion has previously been determined to be mushroom shaped fibers, but the pressure sensitivity of these designs has been unclear – with some groups reporting pressure dependent adhesion, and others claiming no effect. We have compared the microscale adhesion of mushroom shaped polymer fibers at different ambient pressures and have determined that suction cup effects are negligible for fibers with caps less than 16.4 μm in diameter. Further investigation in this work showed that a simple suction cup model provided estimates for the geometry requirements for a non-negligible suction cup effect and determined that the minimum cap radius for the 10 μm pillar diameter used in this study should be over 26 μm – past the dimension that can be successfully fabricated using this technology.

Journal

Journal of Adhesion Science and TechnologyTaylor & Francis

Published: Dec 1, 2012

Keywords: biomimetic; dry adhesives; low-pressure; space applications; polymer microfibers; PDMS

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