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Field of Theoretical and Applied Mechanics, Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, USA
; Fax: +1-(607)-255-2011
; Tel: +1-(607)-255-3718
Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, USA
; Fax: +1-(215)-573-2128
; Tel: +1-(215)-898-9645
Department of Chemical Engineering, Lehigh University, Bethlehem, USA
; Fax: +1-(610)-758-5057
; Tel: +1-(610)-758-4396
Soft Matter, 2011,7, 10728-10736
19 Jul 2011,
26 Aug 2011
First published online
05 Oct 2011
Surface mechanical properties such as adhesion and friction can be controlled by creating a rippled surface. In this paper, we present numerical and experimental studies on adhesive contact between a rippled surface and a rigid spherical indenter. In our numerical method, surface interaction is modeled using Lennard-Jones potential with Derjaguin's approximation. We also carry out a systematic experimental investigation by measuring the adhesion between a spherical glass indenter and rippled polydimethylsiloxane (PDMS) strips with varying amplitudes. With increasing ripple amplitude, our experimental results show a monotonic decrease in pull-off force, transition from full to partial contact, and pressure-sensitive adhesion. Our numerical simulation captures all the salient features of the experimental results remarkably well.
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