No Access Submitted: 28 September 2014 Accepted: 21 January 2015 Published Online: 04 February 2015
Appl. Phys. Lett. 106, 051602 (2015); https://doi.org/10.1063/1.4907255
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  • H. Marvi
  • Y. Han
  • M. Sitti
In this letter, we propose a technique by which we can actively adjust frictional properties of elastic fibrillar structures in different directions. Using a mesh attached to a two degree-of-freedom linear stage, we controlled the active length and the tilt angle of fibers, independently. Thus, we were able to achieve desired levels of friction forces in different directions and significantly improve passive friction anisotropies observed in the same fiber arrays. The proposed technique would allow us to readily control the friction anisotropy and the friction magnitude of fibrillar structures in any planar direction.
The authors thank V. Sariola and U. Abusomwan for invaluable discussions and review of our manuscript, J. Suhan for the SEM micrographs, National Science Foundation (NSF CMMI-1130520) for funding, and members of the NanoRobotics Laboratory for helpful comments.
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