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Transport properties of nanoscale lubricant films

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4 Author(s)
Qian Guo ; Dept. of Chem. Eng., Carnegie Mellon Univ., Pittsburgh, PA, USA ; S. Izumisawa ; M. S. Jhon ; Yiao-Tee Hsia

Off-lattice molecular dynamics simulations based on the coarse-grained bead-spring model via the Langevin equation were performed to simulate the dynamics of a confined nanoscale perfluoropolyether film (i.e., the self-diffusion and relaxation processes). The effects of molecular weight and solid surface attraction on the film diffusion coefficient were studied using the Green-Kubo formula. Via a stretched-exponential model, we investigated the relaxation process of nanofilms, and found that the relaxation spectra were stretched from the exponential decay process for functional endgroups and/or surface attraction.

Published in:

IEEE Transactions on Magnetics  (Volume:40 ,  Issue: 4 )