Lubrication forces in air and accommodation coefficient measured by a thermal damping method using an atomic force microscope

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dc.contributorVirginia Techen
dc.contributor.authorHonig, Christopher D. F.en
dc.contributor.authorSader, J. E.en
dc.contributor.authorMulvaney, P.en
dc.contributor.authorDucker, William A.en
dc.contributor.departmentChemical Engineeringen
dc.date.accessed2013-12-17en
dc.date.accessioned2014-01-17T13:41:32Zen
dc.date.available2014-01-17T13:41:32Zen
dc.date.issued2010-05-01en
dc.description.abstractBy analysis of the thermally driven oscillation of an atomic force microscope (AFM) cantilever, we have measured both the damping and static forces acting on a sphere near a flat plate immersed in gas. By varying the proximity of the sphere to the plate, we can continuously vary the Knudsen number (Kn) at constant pressure, thereby accessing the slip flow, transition, and molecular regimes at a single pressure. We use measurements in the slip-flow regime to determine the combined slip length (on both sphere and plate) and the tangential momentum accommodation coefficient, sigma. For ambient air at 1 atm between two methylated glass solids, the inverse damping is linear with separation and the combined slip length on both surfaces is 250 nm +/- 100 nm, which corresponds to sigma = 0.77 +/- 0.24. At small separations (Kn > 0.4) the measured inverse damping is no longer linear with separation, and is observed to exhibit reasonable agreement with the Vinogradova formula.en
dc.description.sponsorshipAustralian Research Council_DP0664051en
dc.description.sponsorshipNational Science Foundation CBET-0828163en
dc.format.mimetypeapplication/pdfen
dc.identifier.citationHonig, Christopher D. F. ; Sader, John E. ; Mulvaney, Paul ; et al., May 2010. "Lubrication forces in air and accommodation coefficient measured by a thermal damping method using an atomic force microscope," PHYSICAL REVIEW E 81(5) Part 2: 056305. DOI: 10.1103/PhysRevE.81.056305en
dc.identifier.doihttps://doi.org/10.1103/PhysRevE.81.056305en
dc.identifier.issn1539-3755en
dc.identifier.urihttp://hdl.handle.net/10919/24881en
dc.identifier.urlhttp://link.aps.org/doi/10.1103/PhysRevE.81.056305en
dc.language.isoen_USen
dc.publisherAmerican Physical Societyen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectTangential-momentum accommodationen
dc.subjectSlip boundary-conditionen
dc.subjectFrequency-responseen
dc.subjectFilm lubricationen
dc.subjectCalibrationen
dc.subjectSurfacesen
dc.subjectCantileversen
dc.subjectInterfacesen
dc.subjectLiquidsen
dc.subjectFluidsen
dc.subjectPhysicsen
dc.titleLubrication forces in air and accommodation coefficient measured by a thermal damping method using an atomic force microscopeen
dc.title.serialPhysical Review Een
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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