Effective Viscosity of Confined Hydrocarbons

Details Effective Viscosity of Confined Hydrocarbons Effective Viscosity of Confined Hydrocarbons

2012-01-24

arxiv.org/abs/1201.5095v1

Phys. Rev. Lett. 108, 036102 (2012) [4 pages], URL: http://link.aps.org/doi/10.1103/PhysRevLett.108.036102

Physics

Condensed Matter

Materials Science

5 pages, 6 figures

Scientific paper

10.1103/PhysRevLett.108.036102

We present molecular dynamics friction calculations for confined hydrocarbon films with molecular lengths from 20 to 1400 carbon atoms. We find that the logarithm of the effective viscosity \mu eff for nanometer-thin films depends linearly on the logarithm of the shear rate: log(effective viscosity) = C - n log (shear rate), where n varies from 1 (solidlike friction) at very low temperatures to 0 (Newtonian liquid) at very high temperatures, following an inverse sigmoidal curve. Only the shortest chain molecules melt, whereas the longer ones only show a softening in the studied temperature interval 0 < T < 900 K. The results are important for the frictional properties of very thin (nanometer) films and to estimate their thermal durability.

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