Effective viscosity of confined hydrocarbons

Ion Marius Sivebæk, V.N. Samoilov, B.N.J. Persson

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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 ηeff for nanometer-thin films depends linearly on the logarithm of the shear rate: log ηeff=C-nlog γ̇, 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
Original languageEnglish
JournalPhysical Review Letters
Issue number3
Pages (from-to)036102
Publication statusPublished - 2012


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