Microsystem Technologies

, Volume 11, Issue 8–10, pp 881–886 | Cite as

The dynamic behavior of ultrathin lubricant films

  • Yiao-Tee Hsia
  • Qian Guo
  • Satoru Izumisawa
  • Myung S. Jhon
Technical paper

Abstract

Molecular dynamics simulations with the Langevin equation using a coarse-grained, bead-spring model were performed to investigate the dynamic properties of nanoscale lubricant films. The simulated spreading profiles of lubricant nanofilms are in qualitative agreement with previous experimental results. The Einstein’s relationship and Green–Kubo formula provide alternative perspectives for describing the diffusive phenomena of lubricant nanofilms. The effects of molecular weights and their distribution, temperature, and film thickness were examined.

Keywords

Bead-spring model Molecular dynamics Spreading Self-diffusion coefficient Polydispersity Perfluoropolyether 

References

  1. Frenkel D, Smit B (2002) Understanding molecular simulation: from algorithm to applications, 3rd edn. Academic Press, New YorkGoogle Scholar
  2. Grest GS (1996) Grafted polymer brushes in polymeric matrices. J Chem Phys 105:5532–5541CrossRefGoogle Scholar
  3. Guo Q, Izumisawa S, Phillips DM, Jhon MS (2003) Surface morphology and molecular conformation for ultrathin lubricant films with functional end groups. J Appl Phys 93:8707–8709CrossRefGoogle Scholar
  4. Izumisawa S, Jhon MS (2002) Stability analysis and molecular simulation of nanoscale lubricant films with chain-end functional groups. J Appl Phys 91:7583–7585CrossRefGoogle Scholar
  5. Jhon MS, Izumisawa S, Guo Q, Phillips DM, Hsia YT (2003) Simulation of nanostructured lubricant films. IEEE Trans Magn 39:754–758CrossRefGoogle Scholar
  6. Kubo R (1966) Fluctuation–dissipation theorem. Rep Prog Phy 29:255–283CrossRefGoogle Scholar
  7. Ma X, Gui J, Smoliar L, Grannen K, Marchon B, Jhon MS, Bauer CL (1999) Spreading of perfluoropolyalkylether films on amorphous carbon surfaces. J Chem Phys 110:3129–3137CrossRefGoogle Scholar
  8. O’Connor TM, Back YR, Jhon MS, Min BG, Yoon DY, Karis TE (1996) Surface diffusion of thin perfluoropolyalkylether films. J Appl Phys 79:5788–5790CrossRefGoogle Scholar
  9. Vinay SJ, Phillips DM, Lee YS, Schroeder CM, Ma X, Kim MC, Jhon MS (2000) Simulation of ultrathin lubricant films spreading over various carbon surfaces. J Appl Phys 87:6164–6166CrossRefGoogle Scholar

Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • Yiao-Tee Hsia
    • 1
  • Qian Guo
    • 2
  • Satoru Izumisawa
    • 2
  • Myung S. Jhon
    • 2
  1. 1.Seagate Research CenterSeagate TechnologyPittsburghUSA
  2. 2.Department of Chemical Engineering and Data Storage Systems CenterCarnegie Mellon UniversityPittsburghUSA

Personalised recommendations