Abstract：
:The Johnson-Kendall-Roberts theory is the basis of modern contact mechanics. It describes how two deformable objects adhere together, driven by adhesion energy and opposed by elasticity. Here we characterize the indentation of glass particles into soft, silicone substrates using confocal microscopy. We show that, whereas the Johnson-Kendall-Roberts theory holds for particles larger than a critical, elastocapillary lengthscale, it fails for smaller particles. Instead, adhesion of small particles mimics the adsorption of particles at a fluid interface, with a size-independent contact angle between the undeformed surface and the particle given by a generalized version of the Young's law. A simple theory quantitatively captures this behaviour and explains how solid surface tension dominates elasticity for small-scale indentation of soft materials.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Style RW,Hyland C,Boltyanskiy R,Wettlaufer JS,Dufresne ERdoi
10.1038/ncomms3728subject
Has Abstractpub_date
2013-01-01 00:00:00pages
2728issn
2041-1723pii
ncomms3728journal_volume
4pub_type
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