Hostname: page-component-8448b6f56d-t5pn6 Total loading time: 0 Render date: 2024-04-18T13:38:34.562Z Has data issue: false hasContentIssue false
  • English
  • Français

Mechanics of a Novel Shear-activated Microfiber Array Adhesive

Published online by Cambridge University Press:  01 February 2011

Carmel Majidi  and
Ronald S Fearing
Carmel Majidi
Affiliation:
cmajidi@eecs.berkeley.edu, Princeton University, Princeton Institute for the Science and Technology of Materials, 416 Bowen Hall, Princeton, NJ, 08544, United States, (609)258-0494
Ronald S Fearing
Affiliation:
ronf@eecs.berkeley.edu, University of California, Electrical Engineering and Computer Sciences, Berkeley, CA, 94720, United States
Get access

Abstract

Elastic rod theory and principles of contact mechanics motivate the development of a novel, shear-activated, microfiber array adhesive. Unlike with conventional Pressure Sensitive Adhesives (PSAs), the microfiber array and backing are composed entirely of a stiff, glassy polymer (polypropylene, elastic modulus E = 1 GPa) and an externally applied shear load is required to achieve contact with a substrate. Previously, results from a Shear Power Test on glass indicated a maximum interfacial shear strength of 10 kPa over 4 sq. cm, a factor of 1000 greater than with a smooth polypropylene sheet of similar thickness. Here we present a theoretical model that describes the mechanism for shear-activated adhesion and predicts a shear strength of 27 kPa, on the order of the experimental measurement.

Keywords

adhesivebiomimetic (assembly)nanostructure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1086: Symposium U – Mechanics of Nanoscale Materials , 2008 , 1086-U01-11
Copyright
Copyright © Materials Research Society 2008

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1A comprehensive review can be found in June 2007 MRS Bulletin (vol. 32, no. 2) entitled “Sticky Feet: From Animals to Materials.”Google Scholar
2 Lee, J., Majidi, C., Schubert, B., and Fearing, R., J. R. Soc. Interface online [doi:10.1098/rsif.2007.1308] (2008).Google Scholar
3 Majidi, C., Groff, R. E., Maeno, Y., Schubert, B., Baek, S., Bush, B., Maboudian, R., Gravish, N., Wilkinson, M., Autumn, K., and Fearing, R. S., Phys. Rev. Lett. 97, 076103 (2006).Google Scholar
4According to the ultrahigh friction model presented in [3], the sliding resistance is (to first order) invariant to the backing curvature. This assumes that the external pressure will flatten the sample to achieve the minimal number of contacts that the buckling microfibers at the interface can sustain.Google Scholar
5 Autumn, K., Dittmore, A., Santos, D., Spenko, M., and Cutkosky, M., J Exp. Biol. 209, 3569 (2006).Google Scholar
6 Jagota, A. and Bennison, S. J., Integrative & Comparative Biol. 42, 1140 (2002).Google Scholar
7 Johnson, K. L., Kendall, K., and Roberts, A. D., Proc. R. Soc. London Ser. A 324, 301 (1971).Google Scholar
8 Majidi, C., Groff, R. E., and Fearing, R. S., ASME IMECE, Anaheim, CA (2005).Google Scholar
9 Gracias, D. H. and Somorgai, G. A., Macromolecules 31, 1269 (1998).Google Scholar