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A nano-cheese-cutter to directly measure interfacial adhesion of freestanding nano-fibers

Source: J. Appl. Phys. 111, 024315 (2012); http://dx.doi.org/10.1063/1.3677947

Published 27 January 2012

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PUBLICATION DATA
ISSN:
1553-9644 (online)
Publisher:
AIP is a member of CrossRef AIP
Xin Wang,1 Johnny F. Najem,2 Shing-Chung Wong,2 and Kai-tak Wan1
1Mechanical & Industrial Engineering, Northeastern University, Boston, Massachusetts 02115, USA
2Mechanical Engineering, University of Akron, Akron, Ohio 44325, USA
A nano-cheese-cutter is fabricated to directly measure the adhesion between two freestanding nano-fibers. A single electrospun fiber is attached to the free end of an atomic force microscope cantilever, while a similar fiber is similarly prepared on a mica substrate in an orthogonal direction. External load is applied to deform the two fibers into complementary V-shapes, and the force measurement allows the elastic modulus to be determined. At a critical tensile load, “pull-off” occurs when the adhering fibers spontaneously detach from each other, yielding the interfacial adhesion energy. Loading-unloading cycles are performed to investigate repeated adhesion-detachment and surface degradation. ©2012 American Institute of Physics
History: Received 21 October 2011; accepted 14 December 2011; published 27 January 2012
Digital Object Identifier: http://dx.doi.org/10.1063/1.3677947

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