TY  - JOUR
AU  - Sivebaek, I. M.
AU  - Samoilov, V. N.
AU  - Persson, Bo
TI  - Effective Viscosity of Confined Hydrocarbons
JO  - Physical review letters
VL  - 108
IS  - 3
SN  - 1079-7114
CY  - College Park, Md.
PB  - APS
M1  - FZJ-2015-04099
SP  - 036102
PY  - 2012
AB  - 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: logηeff=C−nlogγ˙, 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000299329100019
DO  - DOI:10.1103/PhysRevLett.108.036102
UR  - https://juser.fz-juelich.de/record/201805
ER  -