Molecular Dynamics Simulation of Lubricant Adsorption and Thermal Depletion Instability
In this work, we incorporated a quartic bond potential
into a coarse-grained bead-spring model to study lubricant adsorption
on a solid surface as well as depletion instability. The surface tension
density and the number density profiles were examined to verify the
solid-liquid and liquid-vapor interfaces during heat treatment. It was
found that both the liquid-vapor interfacial thickness and the
solid-vapor separation increase with the temperatureT* when T*is
below the phase transition temperature Tc
*. At high temperatures
(T*>Tc
*), the solid-vapor separation decreases gradually as the
temperature increases. In addition, we evaluated the lubricant weight
and bond loss profiles at different temperatures. It was observed that
the lubricant desorption is favored over decomposition and is the main
cause of the lubricant failure at the head disk interface in our
simulations.
[1] J. Zhou., Y. S. Ma, B. Liu, Q. F. Leng, M. Matsumoto and J. G. Xu,
"Flying height-attitude observation and investigation of sliders in
load/unload process,"IEEE Transactions on Magnetics, vol. 38, pp.
2123-2125, 2002.
[2] S. H. Charap, P. L. Lu and Y. J. He, "Thermal stability of recorded
information at high densities,"IEEE Transactions on Magnetics, vol. 33,
pp. 978-983, 1997.
[3] M. H. Kryder, E. C. Gage, T. W. McDaniel, W. A. Challener, R. E.
Rottmayer, G. P. Ju, Y. T. Hsia and M. F. Erden, "Heat assisted magnetic
recording,"Proceedings of the Ieee,vol. 96, pp. 1810-1835, 2008.
[4] W. A. Challener, C. B. Peng, A. V. Itagi, D. Karns, W. Peng, Y. G. Peng,
X. M. Yang, X. B. Zhu, N. J. Gokemeijer, Y. T. Hsia, G. Ju, R. E.
Rottmayer, M. A. Seigler and E. C. Gage, "Heat-assisted magnetic
recording by a near-field transducer with efficient optical energy
transfer,"Nature Photonics, vol. 3, pp. 220-224, 2009.
[5] L. Wu, "Modelling and simulation of the lubricant depletion process
induced by laser heating in heat-assisted magnetic recording system,"
Nanotechnology, vol. 18, pp. 215702, 2007.
[6] N. Tagawa, R. Kakitani, H. Tani, N. Iketani and I. Nakano, "Study of
lubricant depletion induced by laser heating in thermally assisted
magnetic recording systems-effect of lubricant film materials," IEEE
Transactions on Magnetics, vol. 45, pp. 877-882, 2009.
[7] N. Tagawa, H. Andoh and H. Tani, "Study on lubricant depletion
induced by laser heating in thermally assisted magnetic recording
systems: effect of lubricant thickness and bonding Ratio," Tribology
Letters, vol. 37, pp. 411-418, 2010.
[8] Y. Li, C. H. Wong, B. Li, S. Yu, W. Hua and W. Zhou, "Lubricant
evolution and depletion under laser heating: a molecular dynamics
study," Soft Matter, vol. 8, pp. 5649-5657, 2012.
[9] P. S. Chung, H. G. Chen and M. S. Jhon, "Molecular dynamics
simulation of binary mixture lubricant films," Journal of Applied
Physics, vol. 103, pp. 07F526-3, 2008.
[10] C. H. Wong, B. Li, S. K. Yu, W. Huaand W. D. Zhou, "Molecular
dynamics simulation of lubricant redistribution and transfer at
near-contact head-disk interface," Tribology Letters, vol. 43, pp. 89-99,
2011.
[11] M. J. Stevens, "Interfacial fracture between highly cross-linked polymer
networks and a solid surface: effect of interfacial bond density,"
Macromolecules, vol. 34, pp. 2710-2718, 2001.
[12] M. Tsige and M. J. Stevens, "Effect of cross-linker functionality on the
adhesion of highly cross-linked polymer networks: amolecular
dynamics study of epoxies," Macromolecules, vol. 37, pp. 630-637,
2004.
[13] K. Kremer and G. S. Grest, "Dynamics of entangled linear polymer
melts: a molecular-dynamics simulation," The Journal of Chemical
Physics, vol. 92, pp. 5057-5086, 1990.
[14] J. G. Kirkwood and F. P. Buff, "Thestatisticalmechanicaltheoryof
surface tension," Journal of Chemical Physics, vol. 17, pp. 338-343,
1949.
[15] D. Stansfield, "The surface tensions of liquid argon and nitrogen,"
Proceedings of the Physical Society, vol. 72, pp. 854-866, 1958.
[16] J. W. Cahn and J. E. Hilliard, "Free energy of a nonuniform system. I.
interfacial free energy," The Journal of Chemical Physics, vol. 28, pp.
258-267, 1958.
[17] F. P. Buff, R. A. Lovett and F. H. J. Stillinger, "Interfacial density profile
for fluids in the critical region," Physical Review Letters, vol. 15, pp.
621-623, 1965.
[18] P. Orea, Y. Duda, V. C. Weiss, W. Schroer and J. Alejandre,
"Liquid-vapor interface of square-well fluids of variable interaction
range," Journal of Chemical Physics, vol. 120, pp. 11754-11764, 2004.
[19] R. Ji, T. K. L. Dao, B. X. Xu, J. W. Xu, B. L. Goh, E. Tan, H. Q. Xie and
T. Liew, "Lubricant pickup under laser irradiation," IEEE Transactions
on Magnetics, vol. 47, pp. 1988-1991, 2011.
[1] J. Zhou., Y. S. Ma, B. Liu, Q. F. Leng, M. Matsumoto and J. G. Xu,
"Flying height-attitude observation and investigation of sliders in
load/unload process,"IEEE Transactions on Magnetics, vol. 38, pp.
2123-2125, 2002.
[2] S. H. Charap, P. L. Lu and Y. J. He, "Thermal stability of recorded
information at high densities,"IEEE Transactions on Magnetics, vol. 33,
pp. 978-983, 1997.
[3] M. H. Kryder, E. C. Gage, T. W. McDaniel, W. A. Challener, R. E.
Rottmayer, G. P. Ju, Y. T. Hsia and M. F. Erden, "Heat assisted magnetic
recording,"Proceedings of the Ieee,vol. 96, pp. 1810-1835, 2008.
[4] W. A. Challener, C. B. Peng, A. V. Itagi, D. Karns, W. Peng, Y. G. Peng,
X. M. Yang, X. B. Zhu, N. J. Gokemeijer, Y. T. Hsia, G. Ju, R. E.
Rottmayer, M. A. Seigler and E. C. Gage, "Heat-assisted magnetic
recording by a near-field transducer with efficient optical energy
transfer,"Nature Photonics, vol. 3, pp. 220-224, 2009.
[5] L. Wu, "Modelling and simulation of the lubricant depletion process
induced by laser heating in heat-assisted magnetic recording system,"
Nanotechnology, vol. 18, pp. 215702, 2007.
[6] N. Tagawa, R. Kakitani, H. Tani, N. Iketani and I. Nakano, "Study of
lubricant depletion induced by laser heating in thermally assisted
magnetic recording systems-effect of lubricant film materials," IEEE
Transactions on Magnetics, vol. 45, pp. 877-882, 2009.
[7] N. Tagawa, H. Andoh and H. Tani, "Study on lubricant depletion
induced by laser heating in thermally assisted magnetic recording
systems: effect of lubricant thickness and bonding Ratio," Tribology
Letters, vol. 37, pp. 411-418, 2010.
[8] Y. Li, C. H. Wong, B. Li, S. Yu, W. Hua and W. Zhou, "Lubricant
evolution and depletion under laser heating: a molecular dynamics
study," Soft Matter, vol. 8, pp. 5649-5657, 2012.
[9] P. S. Chung, H. G. Chen and M. S. Jhon, "Molecular dynamics
simulation of binary mixture lubricant films," Journal of Applied
Physics, vol. 103, pp. 07F526-3, 2008.
[10] C. H. Wong, B. Li, S. K. Yu, W. Huaand W. D. Zhou, "Molecular
dynamics simulation of lubricant redistribution and transfer at
near-contact head-disk interface," Tribology Letters, vol. 43, pp. 89-99,
2011.
[11] M. J. Stevens, "Interfacial fracture between highly cross-linked polymer
networks and a solid surface: effect of interfacial bond density,"
Macromolecules, vol. 34, pp. 2710-2718, 2001.
[12] M. Tsige and M. J. Stevens, "Effect of cross-linker functionality on the
adhesion of highly cross-linked polymer networks: amolecular
dynamics study of epoxies," Macromolecules, vol. 37, pp. 630-637,
2004.
[13] K. Kremer and G. S. Grest, "Dynamics of entangled linear polymer
melts: a molecular-dynamics simulation," The Journal of Chemical
Physics, vol. 92, pp. 5057-5086, 1990.
[14] J. G. Kirkwood and F. P. Buff, "Thestatisticalmechanicaltheoryof
surface tension," Journal of Chemical Physics, vol. 17, pp. 338-343,
1949.
[15] D. Stansfield, "The surface tensions of liquid argon and nitrogen,"
Proceedings of the Physical Society, vol. 72, pp. 854-866, 1958.
[16] J. W. Cahn and J. E. Hilliard, "Free energy of a nonuniform system. I.
interfacial free energy," The Journal of Chemical Physics, vol. 28, pp.
258-267, 1958.
[17] F. P. Buff, R. A. Lovett and F. H. J. Stillinger, "Interfacial density profile
for fluids in the critical region," Physical Review Letters, vol. 15, pp.
621-623, 1965.
[18] P. Orea, Y. Duda, V. C. Weiss, W. Schroer and J. Alejandre,
"Liquid-vapor interface of square-well fluids of variable interaction
range," Journal of Chemical Physics, vol. 120, pp. 11754-11764, 2004.
[19] R. Ji, T. K. L. Dao, B. X. Xu, J. W. Xu, B. L. Goh, E. Tan, H. Q. Xie and
T. Liew, "Lubricant pickup under laser irradiation," IEEE Transactions
on Magnetics, vol. 47, pp. 1988-1991, 2011.
@article{"International Journal of Mechanical, Industrial and Aerospace Sciences:51266", author = "Bei Li and Qiu B. Chen and Chee H. Wong", title = "Molecular Dynamics Simulation of Lubricant Adsorption and Thermal Depletion Instability", abstract = "In this work, we incorporated a quartic bond potential
into a coarse-grained bead-spring model to study lubricant adsorption
on a solid surface as well as depletion instability. The surface tension
density and the number density profiles were examined to verify the
solid-liquid and liquid-vapor interfaces during heat treatment. It was
found that both the liquid-vapor interfacial thickness and the
solid-vapor separation increase with the temperatureT* when T*is
below the phase transition temperature Tc
*. At high temperatures
(T*>Tc
*), the solid-vapor separation decreases gradually as the
temperature increases. In addition, we evaluated the lubricant weight
and bond loss profiles at different temperatures. It was observed that
the lubricant desorption is favored over decomposition and is the main
cause of the lubricant failure at the head disk interface in our
simulations.", keywords = "Depletion instability, Lubricant film, Thermal adsorption, Molecular dynamics (MD).", volume = "6", number = "12", pages = "2621-6", }
