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Fibrils with a Roof

As mimics of fibrillar structures found in lizards and ants, we have fabricated and studied a "fibrils with roof" structure as shown below. It has significantly enhanced contact compliance and adhesion compared to a flat control sample made of the same material, (poly) dimethylsiloxane, PDMS.

The figure below shows the difference in the indentation response of the fibrillar material and a flat control. Both were indented by a glass sphere. The fibrillar structure strongly pins the crack and this mechanism increases its effective adhesion.

 

 

See movies of a control and a fibrillar sample.

The figure below shows a crack front that hops unstably between arrest points, a signature of crack trapping and attendant hysteresis.

 

“Bio-inspired crack trapping for enhanced adhesion”, Nicholas J. Glassmaker, Anand Jagota, Chung-Yuen Hui, William L. Noderer, Manoj K. Chaudhury, Proceedings of the National Academy of Sciences , 104 (26) 10786-10791 (2007).

“Enhanced Adhesion and Compliance of Film-Terminated Fibrillar Surfaces”, W.L. Noderer, L. Shen, S. Vajpayee, N.J. Glassmaker, A. Jagota, C-Y. Hui, Proceedings of the Royal Society A , 463 2631-2654, doi:10.1098/rspa.2007.1891 published online 31 July 2007 (2007). 463(2086), published on Oct 08, 2007

 

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anj6@lehigh.edu

610 758 4396