<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi mathvariant="normal">C</mml:mi><mml:mn>60</mml:mn></mml:msub></mml:math>Molecular Bearings

Miura, Kouji; Kamiya, Shu; Sasaki, Naruo

doi:10.1103/physrevlett.90.055509

Cited by 153 publications

(94 citation statements)

References 8 publications

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“…Such a rolling effect of the C 60 molecules as molecular ball-bearings was also recently confirmed by Kamiya and his colleagues. 45 They said that the system whose two graphite planes had a monolayer of C 60 sandwiched between them possessed negligible mean frictional forces due to the rolling effect of the C 60 molecules. This adds to our supposition that the C 60 films with properly controlled thickness and frictional mode could show good lubricity by way of the rolling effect of the C 60 molecules.…”

Section: Formation and Structure Of The C 60 Filmmentioning

confidence: 99%

Preparation and Tribological Studies of C₆₀ Thin Film Chemisorbed on a Functional Polymer Surface

2004

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A novel self-assembled C60 film was prepared by chemical adsorption of C60 molecules onto an aminogroup-containing polyethyleneimine-coated silicon substrate surface. The contact angle of distilled water on the C 60 film was measured, the thickness was determined by means of ellipsometric analysis, and the morphology was observed with an atomic force microscope. The tribological properties of the films were investigated as well. It was found that the C 60 thin film had a contact angle of about 72°and thickness of 1.8 nm and exhibited a surface domain microstructure composed of fullerene clusters. Due to the hydrophobicity and low surface energy, the C 60 film possessed good adhesive resistance and had an adhesive force of about 7.1 nN, which was about an order of magnitude lower than that of the silicon substrate surface. Moreover, the C 60 film showed good friction reduction, load-carrying capacity, and antiwear ability, which were attributed to the higher mechanical stiffness and elastic modulus of C60 molecules. Besides, the friction coefficient decreased with increasing sliding velocity and normal loads, due to the rolling effect of the physisorbed C 60 molecules.

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Section: Formation and Structure Of The C 60 Filmmentioning

confidence: 99%

Preparation and Tribological Studies of C₆₀ Thin Film Chemisorbed on a Functional Polymer Surface

2004

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“…Recently, it has been demonstrated that fullerene serves a lubricant function, being described as a "molecular bearing" with superlubricity (42,43). Reducing the friction on joint surfaces may prevent the further development of cartilage degeneration (44).…”

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confidence: 99%

Water‐soluble C60 fullerene prevents degeneration of articular cartilage in osteoarthritis via down‐regulation of chondrocyte catabolic activity and inhibition of cartilage degeneration during disease development

Yudoh

Shishido

Murayama

et al. 2007

Arthritis & Rheumatism

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Objective. Studies have shown the roles of oxidative stress in the pathogenesis of osteoarthritis (OA) and induction of chondrocyte senescence during OA progression. The aim of this study was to examine the potential of a strong free-radical scavenger, watersoluble fullerene (C60), as a protective agent against catabolic stress-induced degeneration of articular cartilage in OA, both in vitro and in vivo.Methods. In the presence or absence of C60 (100 M), human chondrocytes were incubated with interleukin-1␤ (10 ng/ml) or H 2 O 2 (100 M), and chondrocyte activity was analyzed. An animal model of OA was produced in rabbits by resection of the medial meniscus and medial collateral ligament. Rabbits were divided into 5 subgroups: sham operation or treatment with C60 at 0.1 M, 1 M, 10 M, or 40 M. The left knee joint was injected intraarticularly with watersoluble C60 (2 ml), while, as a control, the right knee joint received 50% polyethylene glycol (2 ml), once weekly for 4 weeks or 8 weeks. Knee bone and cartilage tissue were prepared for histologic analysis. In addition, in the OA rabbit model, the effect of C60 (10 M) on degeneration of articular cartilage was compared with that of sodium hyaluronate (HA) (5 mg/ml).Results. C60 (100 M) inhibited the catabolic stress-induced production of matrix-degrading enzymes (matrix metalloproteinases 1, 3, and 13), downregulation of matrix production, and apoptosis and premature senescence in human chondrocytes in vitro.In rabbits with OA, treatment with water-soluble C60 significantly reduced articular cartilage degeneration, whereas control knee joints showed progression of cartilage degeneration with time. This inhibitory effect was dose dependent, and was superior to that of HA. Combined treatment with C60 and HA yielded a significant reduction in cartilage degeneration compared with either treatment alone. Conclusion.The results indicate that C60 fullerene is a potential therapeutic agent for the protection of articular cartilage against progression of OA.During the development of osteoarthritis (OA), mechanical and chemical stresses on articular cartilage change the stable cellular activities of chondrocytes and stimulate the production of growth factors and matrix proteins as well as inflammation mediators (1-4). It is well known that catabolic-stressed chondrocytes produce excess amounts of reactive oxygen species (ROS) (superoxide, nitric oxide, hydrogen peroxide, and peroxynitrite) as well as proinflammatory cytokines and chemokines (4-9).Studies have provided ample confirmation of the generation of ROS and the depletion of cellular antioxidants in degenerated articular cartilage (8-10). Numerous reports have indicated that the degeneration of articular cartilage is partially mediated by oxygenderived free radicals (8-12). Kurz et al reported that the extent of mechanical stress on articular cartilage is sufficient to stimulate an excess production of ROS from chondrocytes, leading to depolymerization of hyaluronic acid and chondrocyte death (11,12). Similarly, Gree...

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“…The order of magnitude of the position of the potential barrier, x  , is comparable to that of the atomic-scale distance between the neighboring stable AB-stacking positions within x-y plane. Here the AB-stacking registry formed between a graphite flake and a graphite substrate surface is considered (Miura et al, 2003(Miura et al, , 2004. This indicates that the peeling of the MWCNT starts when the outermost graphene sheet of the MWCNT goes over the potential barrier of the AB-stacking registry with the graphite substrate surface, as depicted in the lower part of Fig.…”

Section: Resultsmentioning

confidence: 99%

Nonoadhesion and Nanopeeling Forces of Carbon Nanotube on Substrate

Miura¹,

Sasaki²,

Ishikawa³

2011

Carbon Nanotubes - From Research to Applications

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C60Molecular Bearings

Cited by 153 publications

References 8 publications

Preparation and Tribological Studies of C₆₀ Thin Film Chemisorbed on a Functional Polymer Surface

Preparation and Tribological Studies of C₆₀ Thin Film Chemisorbed on a Functional Polymer Surface

Water‐soluble C60 fullerene prevents degeneration of articular cartilage in osteoarthritis via down‐regulation of chondrocyte catabolic activity and inhibition of cartilage degeneration during disease development

Nonoadhesion and Nanopeeling Forces of Carbon Nanotube on Substrate

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C60Molecular Bearings

Cited by 153 publications

References 8 publications

Preparation and Tribological Studies of C60 Thin Film Chemisorbed on a Functional Polymer Surface

Preparation and Tribological Studies of C60 Thin Film Chemisorbed on a Functional Polymer Surface

Water‐soluble C60 fullerene prevents degeneration of articular cartilage in osteoarthritis via down‐regulation of chondrocyte catabolic activity and inhibition of cartilage degeneration during disease development

Nonoadhesion and Nanopeeling Forces of Carbon Nanotube on Substrate

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Preparation and Tribological Studies of C₆₀ Thin Film Chemisorbed on a Functional Polymer Surface

Preparation and Tribological Studies of C₆₀ Thin Film Chemisorbed on a Functional Polymer Surface