A molecular dynamics simulation of confined n-alkanes is conducted to investigate the effect of chain length (C8, C16, C32, C64) and normal load (250, 500, 750, 1000MPa) on friction and asperity contact. The results indicate that the longer chain n-alkanes maintain more monolayer atoms in the asperity contact interface than the shorter ones and as a result significantly reduce the friction force. Under a normal load of 250MPa, the asperity with C32 and C64 are separated by the lubricant with less metal contact. Periodic friction force is observed and it correlates with the deformation of the local lattice that breaks and relocates the atoms during the asperity contact.

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