In Situ Control of Gas Flow by Modification of Gas-Solid Interactions

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dc.contributorVirginia Techen
dc.contributor.authorSeo, D.en
dc.contributor.authorDucker, William A.en
dc.contributor.departmentChemical Engineeringen
dc.date.accessed2013-12-10en
dc.date.accessioned2013-12-10T17:31:20Zen
dc.date.available2013-12-10T17:31:20Zen
dc.date.issued2013-10-25en
dc.description.abstractThe boundary condition for gas flow at the solid-gas interface can be altered by in situ control of the state of a thin film adsorbed to the solid. A monolayer of ocatadecyltrichlorosilane (OTS) reversibly undergoes a meltinglike transition. When the temperature of an OTS-coated particle and plate is moved through the range of OTS "melting'' temperatures, there is a change in the lubrication force between the particle and plate in 1 atm of nitrogen gas. This change is interpreted in terms of a change in the flow of gas mediated by the slip length and tangential momentum accommodation coefficient (TMAC). There is a minimum in slip length (290 nm) at 18 degrees C, which corresponds to a maximum in TMAC (0.44). The slip length increases to 590 nm at 40 degrees C which corresponds to a TMAC of 0.25. We attribute the decrease in TMAC with increasing temperature to a decrease in roughness of the monolayer on melting, which allows a higher fraction of specular gas reflections, thereby conserving tangential gas momentum. The importance of this work is that it demonstrates the ability to control gas flow simply by altering the interface for fixed geometry and gas properties.en
dc.description.sponsorshipNational Science Foundation CBET-0959228en
dc.format.mimetypeapplication/pdfen
dc.identifier.citationSeo, Dongjin ; Ducker, William A., Oct 25, 2013. “In Situ Control of Gas Flow by Modification of Gas-Solid Interactions,” PHYSICAL REVIEW LETTERS 111(17): 174502. DOI: 10.1103/PhysRevLett.111.174502en
dc.identifier.doihttps://doi.org/10.1103/PhysRevLett.111.174502en
dc.identifier.issn0031-9007en
dc.identifier.urihttp://hdl.handle.net/10919/24512en
dc.identifier.urlhttp://link.aps.org/doi/10.1103/PhysRevLett.111.174502en
dc.language.isoen_USen
dc.publisherAmerican Physical Societyen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectAtomic force microscopyen
dc.subjectAccommodationen
dc.subjectFilmsen
dc.subjectPhysicsen
dc.titleIn Situ Control of Gas Flow by Modification of Gas-Solid Interactionsen
dc.title.serialPhysical Review Lettersen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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