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Simultaneous measurement of film thickness and coverage of loaded boundary films with complex impedance analysis

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Abstract

A new technique has been developed for investigating into the physical properties of loaded boundary films between metal surfaces, in which mercury is used as a counter surface of a steel surface for minimizing the effects of the individually different topographies of solid surfaces. An oil film is loaded by squeezing the steel surface into mercury, and the time evolutions of film thickness and coverage are obtained simultaneously with the complex impedance analysis thorough an equivalent electrical circuit. The loaded film of hexadecane is drained down to a thickness about 2 nm with decreasing coverage from unity to zero, in which a dependent relationship is found between film thickness and coverage. The addition of 0.01 wt% hexadecanoic acid into hexadecane forms an explicit residual film with a thickness about a few micrometers and a coverage of unity, which has an ability to support a mean pressure about 0.1 kPa without any hydrodynamic effects.

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Acknowledgment

The authors would like to express their sincere thanks to Nippon Oil Corporation for their helpful discussion as well as financial support.

Author information

Correspondence to K. Nakano.

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Nakano, K., Akiyama, Y. Simultaneous measurement of film thickness and coverage of loaded boundary films with complex impedance analysis. Tribol Lett 22, 127–134 (2006). https://doi.org/10.1007/s11249-006-9074-z

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Keywords

  • boundary lubrication test methods
  • mercury
  • nanotribology
  • non-Newtonian behavior
  • rheology
  • viscoelasticity