dc.citation.conferencePlace |
US |
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dc.citation.conferencePlace |
Williamsburg |
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dc.citation.title |
Limits of Lubrication Conference |
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dc.contributor.author |
Cho, Yoon-Kyoung |
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dc.contributor.author |
Granick, S. |
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dc.date.accessioned |
2023-12-20T07:06:23Z |
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dc.date.available |
2023-12-20T07:06:23Z |
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dc.date.created |
2014-12-23 |
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dc.date.issued |
1996-04-14 |
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dc.description.abstract |
To understand the dependence of nanorheology on molecular architecture for perfluorinated molecules, studies were performed using two lubricants commonly used in the magnetic storage industry. Experiments mimicked a single asperity by confining liquids to molecular spacings between atomically smooth mica and applying oscillatory shear forces. The force-distance profiles were compared. Large differences were obtained for the linear shear response. The elastic and dissipative shear moduli of a branched perfluoropolymer (Krytox-AZ) were comparable even at high loads, signifying that the fluid remained fluid-like over experimental frequencies. However, linear perfluoropolymer (Demmim S-20) was easily solidified. The nonlinear responses were also surprising. Previously, we (G. Reiter et al., Science 263 (1994) 1741) reported that the shear-induced transition from an elastic state (at rest) to a dissipative state (during sliding) was discontinuous and hysteric for various hydrocarbon fluids but not for the perfluorinated chain, perfluoroheptaglyme. However, the stick-slip transition was discontinuous, and even more hysteretic for the linear perfluoropolymer (Demnum S-20). |
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dc.identifier.bibliographicCitation |
Limits of Lubrication Conference |
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dc.identifier.uri |
https://scholarworks.unist.ac.kr/handle/201301/47238 |
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dc.language |
영어 |
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dc.publisher |
Limits of Lubrication Conference |
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dc.title |
Shear of Confined Perfluorinated Molecules |
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dc.type |
Conference Paper |
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dc.date.conferenceDate |
1996-04-14 |
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