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TECHNICAL PAPERS

Spreading Characteristics of Molecularly Thin Lubricant on Surfaces With Groove-Shaped Textures: Monte Carlo Simulation and Measurement Using PFPE Film

[+] Author and Article Information
Hedong Zhang, Yasunaga Mitsuya, Maiko Yamada

Nagoya University, Department of Electronic- Mechanical Engineering, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan

J. Tribol 124(3), 575-583 (May 31, 2002) (9 pages) doi:10.1115/1.1456085 History: Received March 19, 2001; Revised August 15, 2001; Online May 31, 2002
Copyright © 2002 by ASME
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References

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Novotony,  V. J., and Baldwinson,  M. A., 1991, “Lubricant Dynamics in Sliding and Flying,” J. Appl. Phys., 10, No. 10, pp. 5647–5652.
Ishii,  M., and Kawakubo,  Y., 1997, “Simultaneous Measurement of Pin Wear and Change in Lubricant Thickness on Thin-Film Magnetic Disks,” IEEE Trans. Magn., 33, No. 6, pp. 4560–4565.
O’Connor,  T. M., Jhon,  M. S., Bauer,  C. L., Min,  B. G., Yoon,  D. Y., and Karis,  T. E., 1995, “Surface Diffusion and Flow Activation Energies of Perfluoropolyalkylether,” Tribol. Lett., 1, pp. 219–223.
Min,  B. G., Choi,  J. W., Brown,  H. R., Yoon,  D. Y., O’Connor,  T. M., and Jhon,  M. S., 1995, “Spreading Characteristics of Thin Liquid Films of Perfluoropolyalkylethers on Solid Surfaces. Effects of Chain-end Functionality and Humidity,” Tribol. Lett., 1, pp. 225–232.
Ma,  X., Gui,  J., Smoliar,  L., Grannen,  K., Marchon,  B., Bauer,  C. L., and Jhon,  M. S., 1999, “Complex Terraced Spreading of Perfluoropolyalkylether Films on Carbon Surfaces,” Phys. Rev. E, 59, No. 1, pp. 722–726.
Ma,  X., Gui,  J., Smoliar,  L., Grannen,  K., Marchon,  B., Jhon,  M. S., and Bauer,  C. L., 1999, “Spreading of Perfluoropolyalkylether Films on Amorphous Carbon Surfaces,” J. Chem. Phys., 110, No. 6, pp. 3129–3137.
Tyndall,  G. W., Karis,  T. E., and Jhon,  M. S., 1999, “Spreading Profiles of Molecularly Thin Perfluoropolyether Films,” Tribol. Trans., 42, No. 3, pp. 463–470.
Lukkarinen,  A., Kaski,  K., and Abraham,  D. B., 1995, “Mechanisms of Fluid Spreading: Ising Model Simulation,” Phys. Rev. E, 51, No. 3, pp. 2199–2202.
Heslot,  F., Cazabat,  A. M., Levinson,  P., and Fraysse,  N., 1990, “Experiments on Wetting on the Scale of Nanometers: Influence of the Surface Energy,” Phys. Rev. Lett., 65, No. 5, pp. 599–602.
Ma,  X., Bauer,  C. L., Jhon,  M. S., Gui,  J., and Marchon,  B., 1999, “Monte Carlo Simulations of Liquid Spreading on a Solid Surface: Effect of End-Group Functionality,” Phys. Rev. E, 60, No. 5, pp. 5795–5801.
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Figures

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Interactions between a molecular and solid surface: (a) on plane; and (b) around corner.
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Effect of groove depth for J/kBT=2 and A/J=200: (a) spreading distance versus time; and (b) spreading distance squared versus time.
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Effect of groove depth for J/kBT=2 and A/J=2.5: (a) spreading distance versus time; and (b) spreading distance squared versus time.
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Configurations of experimental disks (unit: μm): (a) disk A, and (b) disk B.
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Example of light intensity curve
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Lubricant spreading on grooved surface of disk A: (a) 5 min; and (b) 24 h after dripping.
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Lubricant spreading on grooved surface of disk B: (a) 12 min; and (b) 24.2 h after dripping.
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Spreading of non-polar lube on smooth surface: (a) coupling constants (J/kBT=2 and A/J=200); and (b) coupling constants (J/kBT=2 and A/J=2.5).
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Lengths of axes versus time
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Spreading distance squared versus time
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Spreading on non-polar lube inside a groove (b=10,d=5): (a) coupling constants (J/kBT=2 and A/J=200); and (b) coupling constants (J/kBT=2 and A/J=2.5).
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Spreading profiles of non-polar lube inside a groove: (a) coupling constants (J/kBT=2 and A/J=200); and (b) coupling constants (J/kBT=2 and A/J=2.5).
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Comparison between spreading profiles of lubricant inside grooves with different widths
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Lubricant spreading on grooved surface of disk B: (a) 4 min; and (b) 24 h after dripping.
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Spreading distance versus time on grooved surface of disk B

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