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Cho, Yoon-Kyoung
Integrated Nano-Biotech Lab (INBL)
Research Interests
  • Microfluidics, Lab-on-a-chip, personalized biomedical diagnostics, nanobioengineering

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Shear of confined perfluorinated molecules: Effect of side branching

Cited 17 times inthomson ciCited 20 times inthomson ci
Title
Shear of confined perfluorinated molecules: Effect of side branching
Author
Cho, Yoon-KyoungGranick, Steve
Issue Date
1996-12
Publisher
ELSEVIER SCIENCE SA
Citation
WEAR, v.200, no.1-2, pp.346 - 352
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).
URI
https://scholarworks.unist.ac.kr/handle/201301/5923
URL
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=0030400192
DOI
10.1016/S0043-1648(96)07296-1
ISSN
0043-1648
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CHM_Journal Papers
BME_Journal Papers
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