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000042960 0247_ $$2DOI$$a10.1063/1.1806814
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000042960 084__ $$2WoS$$aPhysics, Atomic, Molecular & Chemical
000042960 1001_ $$0P:(DE-HGF)0$$aSamoilov, V. N.$$b0
000042960 245__ $$aThe effect of surface roughness on the adhesion of solid surfaces for systems with and without liquid lubricant
000042960 260__ $$aMelville, NY$$bAmerican Institute of Physics$$c2004
000042960 300__ $$a9639 - 9647
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000042960 440_0 $$03145$$aJournal of Chemical Physics$$v121$$x0021-9606$$y19
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000042960 520__ $$aWe present molecular dynamics results for the interaction between two solid elastic walls during pull-off for systems with and without octane (C(8)H(18)) lubricant. We used two types of substrate--flat and corrugated--and varied the lubricant coverage from approximately 1/8 to approximately 4 ML (monolayers) of octane. For the flat substrate without lubricant the maximum adhesion was found to be approximately three times larger than for the system with the corrugated substrate. As a function of the octane coverage (for the corrugated substrate) the pull-off force first increases as the coverage increases from 0 to approximately 1 ML, and then decreases as the coverage is increased beyond monolayer coverage. It is shown that at low octane coverage, the octane molecules located in the substrate corrugation wells during squeezing are pulled out of the wells during pull-off, forming a network of nanocapillary bridges around the substrate nanoasperities, thus increasing the adhesion between two surfaces. For greater lubricant coverages a single capillary bridge is formed. The adhesion force saturates for lubricant coverages greater than 3 ML. For the flat substrate, during pull-off we observe discontinuous, thermally activated changes in the number n of lubricant layers (n-1-->n layering transitions), whereas for the corrugated substrate these transitions are "averaged" by the substrate surface roughness.
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000042960 7001_ $$0P:(DE-HGF)0$$aSivebaek, I. M.$$b1
000042960 7001_ $$0P:(DE-Juel1)130885$$aPersson, B. N. J.$$b2$$uFZJ
000042960 773__ $$0PERI:(DE-600)1473050-9$$a10.1063/1.1806814$$gVol. 121, p. 9639 - 9647$$p9639 - 9647$$q121<9639 - 9647$$tThe @journal of chemical physics$$v121$$x0021-9606$$y2004
000042960 8567_ $$uhttp://hdl.handle.net/2128/1393$$uhttp://dx.doi.org/10.1063/1.1806814
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