Evaluation of the Tribological behavior of Nano-Onions in Krytox 143AB

Street, Kenneth W.; Marchetti, M.; Wal, Randy L. Vander; Tomasek, Aaron J.

doi:10.1023/b:tril.0000009724.01711.f4

Cited by 55 publications

(23 citation statements)

References 10 publications

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“…Other researchers also obtained poor results in friction tests using C 60 [15][16][17][18][19][20], dismissing the nano-bearing rolling hypothesis. Tribological studies have been performed on carbon onions (also known as nano-onions or onion-like carbon), which are approximately 5-10 nm in diameter or greater and consist of concentric, spherical, closed fullerene shells [21][22][23] the weak interaction between the outermost shells of the carbon onions, which allow nano-onions to slide past one another and between asperity contact points. However, a detailed contact analysis to reveal the shear deformation mechanisms was not performed and it is unknown if nanoonions were sheared into graphene planes or simply slid relative to each other in the contact area.…”

Section: Introductionmentioning

confidence: 99%

Tribological Properties of Carbon Nanopearls Synthesized by Nickel-Catalyzed Chemical Vapor Deposition

et al. 2008

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Section: Introductionmentioning

confidence: 99%

Tribological Properties of Carbon Nanopearls Synthesized by Nickel-Catalyzed Chemical Vapor Deposition

et al. 2008

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“…Under severe conditions, very small graphite particles can produce a layer that helps to protect the surfaces; however, it is the edge sites present at the graphitic lamella that promote decomposition of graphite lubricant. As an alternative to graphite we have evaluated the ability of graphitic nano-onions, 20% by weight, to make oil into a thick grease while simultaneously improving the lubricating lifetime of the oil, Krytox TM 143AB, in SOT testing (Street et al 2004). The anticipated advantage of the nanostructured carbon is that the particles are small and contain few reactive edge sites.…”

Section: Postmortem Analysis Of Space Lubricants-fundamental Investigmentioning

confidence: 99%

Liquid Space Lubricants Examined by Vibrational Microspectroscopy

Street

2008

Analytical Letters

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Considerable effort has been expended to develop liquid lubricants for satellites and space exploration vehicles. These lubricants must often perform under a range of harsh conditions such as vacuum, radiation, and temperature extremes while in orbit or in transit and in extremely dusty environments at destinations such as the moon and Mars. Historically, oil development was guided by terrestrial application, which did not provide sufficient space lubricants. Novel fluids such as perfluorinated polyethers provided some relief but are far from ideal. With each new fluid proposed to solve one problem, other problems have arisen. Much of the work performed at National Aeronautics and Space Adminstration's (NASA) Glenn Research Center, in elucidating mechanisms by which chemical degradation of space oils occur, has been done by infrared and Raman microspectroscopy, which this review details. Fundamental lubrication studies are presented as well as actual case studies, in which vibrational spectroscopy led to millions of dollars in savings and potentially prevented loss of mission.

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“…These properties make them suitable for applications such as the encapsulation of foreign materials [25,26], catalyst supports [27] and lubricant additives [28,29]. The combination of CNOs with polymers obtains novel materials with great potential in a wide range of different applications including optical limiting [12,30,31], energy and gas stores [32,33], anode materials for Lithium-Ion Batteries [34] and additives for capacitor devices [35].…”

Section: When Kroto and Mckaymentioning

confidence: 99%