Anand Jagota's Group Web Site
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.
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
610 758 4396