Bulletin of the American Physical Society
APS March Meeting 2011
Volume 56, Number 1
Monday–Friday, March 21–25, 2011; Dallas, Texas
Abstract: C1.00152 : A low friction coefficient between graphane coated surfaces
Author:
Using first-principles calculations, we investigate the
electronic properties and stability of recently synthesized 2D
hydrocarbon in honeycomb structure, namely graphane. Varios
charge analysis result that in graphane geometry negatively
charged carbon atoms are sandwiched between positively charged
hydrogen atoms bound from both sites. In addition high frequency
vibration modes associated with C-H bonds are well separated from
the rest of the spectrum. The repulsive interaction between two
graphane layers due to mainly strong Coulomb interaction serves
as if a boundary lubricant and prevents the sliding graphane
surfaces from being closer to each other even under high normal
forces. As a result, calculated lateral force variation generated
during sliding has small magnitude under high constant loading
forces. Superlow friction observed earlier between diamondlike
carbon-coated surfaces can be understood strong and stiff
carbon-carbon and carbon-hydrogen bonds which do not favor energy
dissipation.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.C1.152
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