Bibliographic Citation
| Document | For copies of Journal Articles, please contact the Publisher or your local public or university library and refer to the information in the Resource Relation field. For copies of other documents, please see the Availability, Publisher, Research Organization, Resource Relation and/or Author (affiliation information) fields and/or Document Availability. |
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| DOI | http://dx.doi.org/10.1063/1.474172 |
| Title | Shear behavior of squalane and tetracosane under extreme confinement. II. Confined film structure |
| Creator/Author | Gupta, S.A. ; Cochran, H.D. ; Cummings, P.T. [Department of Chemical Engineering, University of Tennessee, Knoxville, Tennessee 37996-2200 (United States)]|[Chemical Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6268 (United States)] |
| Publication Date | 1997 Dec 01 |
| OSTI Identifier | OSTI ID: 550464 |
| DOE Contract Number | AC05-96OR22464 |
| Other Number(s) | Journal ID: JCPSA6; ISSN 0021-9606; TRN: TRN: 9723M0087 |
| Resource Type | Journal Article |
| Resource Relation | Journal Name: Journal of Chemical Physics; Journal Volume: 107; Journal Issue: 23; Other Information: PBD: Dec 1997 |
| Research Org | Oak Ridge National Laboratory |
| Subject | 42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; LUBRICANTS; SHEAR PROPERTIES; THIN FILMS; LIQUIDS; ALKANES; SQUALANE; SLIP FLOW; MOLECULAR DYNAMICS METHOD; SIMULATION; RHEOLOGY |
| Description/Abstract | This paper focuses on the structural characteristics of confined squalane and tetracosane under shear flow conditions. Nonequilibrium molecular dynamics simulation is used to explore the rheology of these model lubricants. A preceding paper describes the molecular model and the simulation method, and examines interfacial slip. The lubricants are confined between model walls that have short chains tethered to them, thus screening the wall details. In this paper we examine the density profiles and chain conformations of the alkanes under shear flow conditions. Our results indicate a profound influence of the walls on the fluid structure. In particular, when the wall spacing is close to an integral multiple of the molecular diameter, tetracosane shows the formation of distinct layers with the molecules being in a fully extended state. This behavior is not observed for squalane. Under shear flow conditions the molecules tend to orient parallel to the walls, as would be expected, with a greater degree of orientation (a) close to the walls, (b) at the positions of local density maxima, and (c) at higher strain rates. {copyright} {ital 1997 American Institute of Physics.} |
| Country of Publication | United States |
| Language | English |
| Format | Medium: X; Size: pp. 10327-10334 |
| System Entry Date | 2009 Dec 16 |
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