“…However, the kinetic friction coefficient μ k hardly changed during the “smooth-to-rough” sliding transition, being μ k = 0.17 ± 0.01 for smooth sliding and μ k = 0.14 ± 0.01 for rough sliding, independent of the sliding velocity over the range 0.2−4 μm/s (Figures and ). We note that the measured friction coefficient for rough sliding (μ k ≈ 0.14) agrees with previously reported values of μ k ≈ 0.15 obtained on macroscopic surfaces coated with solid layers of C 60 . , 2 Kinetic friction forces F k as a function of applied load L for two 512 Å thick layers of crystalline C 60 on mica sliding at V = 0.5 μm/s. ( A ) Smooth sliding, before damage, S c (kinetic) = 0.34 MPa, μ k ≈ 0.17.…”
Section: Resultssupporting
confidence: 87%
“…Previous experiments have found C 60 to be an unexceptional or even disappointing lubricant, − ,,, exhibiting a “normal” friction coefficient of μ ≈ 0.15 (as found in refs and as well as here) with no obvious beneficial tribological properties. This has come as a surprise because C 60 is known to rotate rapidly in the solid lattice, suggesting that it could function as a molecular ball bearing and thus act as a good (dry) lubricant.…”
Using a surface forces apparatus, measurements were made of the
static adhesion and
dynamic friction forces between two smooth solid crystalline surfaces
of C60 deposited as
uniform layers on mica substrates. Between molecularly smooth
surfaces, the surface energy
(adhesion energy per unit area) was unusually low, whereas the static
friction force was
very high. However, the kinetic friction force between both smooth
and rough C60 surfaces
was “normal”, and the same as previously measured between rough
surfaces. Some of these
unusual properties can be rationalized in terms of the large size and
nearly perfect spherical
shape of the C60 molecule. The results and analysis
suggest that C60 and other large spherical
molecules with diameters greater than 5−10 Å interact more as
macroscopic particles than
as conventional molecules.
“…However, the kinetic friction coefficient μ k hardly changed during the “smooth-to-rough” sliding transition, being μ k = 0.17 ± 0.01 for smooth sliding and μ k = 0.14 ± 0.01 for rough sliding, independent of the sliding velocity over the range 0.2−4 μm/s (Figures and ). We note that the measured friction coefficient for rough sliding (μ k ≈ 0.14) agrees with previously reported values of μ k ≈ 0.15 obtained on macroscopic surfaces coated with solid layers of C 60 . , 2 Kinetic friction forces F k as a function of applied load L for two 512 Å thick layers of crystalline C 60 on mica sliding at V = 0.5 μm/s. ( A ) Smooth sliding, before damage, S c (kinetic) = 0.34 MPa, μ k ≈ 0.17.…”
Section: Resultssupporting
confidence: 87%
“…Previous experiments have found C 60 to be an unexceptional or even disappointing lubricant, − ,,, exhibiting a “normal” friction coefficient of μ ≈ 0.15 (as found in refs and as well as here) with no obvious beneficial tribological properties. This has come as a surprise because C 60 is known to rotate rapidly in the solid lattice, suggesting that it could function as a molecular ball bearing and thus act as a good (dry) lubricant.…”
Using a surface forces apparatus, measurements were made of the
static adhesion and
dynamic friction forces between two smooth solid crystalline surfaces
of C60 deposited as
uniform layers on mica substrates. Between molecularly smooth
surfaces, the surface energy
(adhesion energy per unit area) was unusually low, whereas the static
friction force was
very high. However, the kinetic friction force between both smooth
and rough C60 surfaces
was “normal”, and the same as previously measured between rough
surfaces. Some of these
unusual properties can be rationalized in terms of the large size and
nearly perfect spherical
shape of the C60 molecule. The results and analysis
suggest that C60 and other large spherical
molecules with diameters greater than 5−10 Å interact more as
macroscopic particles than
as conventional molecules.
“…Fullerene is tipically deposited on the substrate as film by vacuum evaporation or ion plating. [40][41][42][43] One of the characteristic features of fullerenes is their ability to sublimate at considerably lower temperatures as compared to other stable forms of carbon. [44][45][46] Modification of thin C 60 films is limited to expensive methods such as ion beam bombardment.…”
Section: O N L I N E F I R S T Hydrophobic Carbon Based Nanoparticlesmentioning
It must be stressed that the manuscript still has to be subjected to copyediting, typesetting, English grammar and syntax corrections, professional editing and authors' review of the galley proof before it is published in its final form. Please note that during these publishing processes, many errors may emerge which could affect the final content of the manuscript and all legal disclaimers applied according to the policies of the Journal.
“…Katsunori KOBAYASHI 1) , Seiichiro HIRONAKA 1) *, Akihiro TANAKA 2) , Kazunori UMEDA 2) , Sumio IIJIMA 2), 3), 4), 5) , Masako YUDASAKA 4), 5) , Daisuke KASUYA 3) **, and Masahiro SUZUKI sheets. The density of HT-CNH may be a little higher than that of CNH, because of the reduced aggregate diameter.…”
Section: Additive Effect Of Carbon Nanohorn On Grease Lubrication Promentioning
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