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Adsorption Studies with a Graphite Fiber Microbalance

  • L. Bruschi
  • G. Torzo
Part of the NATO ASI Series book series (NSSB, volume 267)

Abstract

The present work describes the graphite fiber microbalance, a sophisticated and powerful technique that we used to investigate the growth behavior of film adsorbed onto graphite. Our first result obtained with this method was the detection of a triple point wetting transition for argon1: here we report several improvements we introduced, during the last three years, both in the experimental set-up and in the data reduction procedure. This technique is in fact a rather recent acquisition in the field of experimental adsorption studies: a simpler and less accurate version was first used by C. Bartosh and S. Gregory in 1985 to investigate the oxygen adsorption close to the bulk triple temperature2, and later by P. Taborek and L. Senator3, and by G. Zimmerli and M.W. Chan4 to study the wetting transition in liquid helium. The improved version here described includes: 1) a detailed analysis of the effects due to the interaction of the oscillating probe with the vapor phase, 2) a different driving mechanism, 3) a sophisticated frequency-lock apparatus, and 4) a cell geometry optimized for reduction of the thermal gradients.

Keywords

Resonant Frequency Data Reduction Procedure Volumetric Adsorption Resonant Frequency Measurement Stainless Steel Filling 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    L.Bruschi, G.Torzo and M.W.Chan,Wetting Behavior of Argon on Graphite Eur.P ys. Lett, 6: 541 (1988)Google Scholar
  2. 2.
    C.Bartosh and S.Gregory, Mechanical Properties of Oxygen Multilayers on Graphite Phys. Rev.Lett. 54: 2513 (1985)ADSCrossRefGoogle Scholar
  3. 3.
    P.Taborek and L.Senator, Wetting Transition in Liquid Helium, Phys. Rev, 57: 218 (1986)Google Scholar
  4. 4.
    G.Zimmerli and M.W.Chan, Complete Wetting of Helium on Graphite, Phys. Rev.B 38: 8760 (1988)ADSCrossRefGoogle Scholar
  5. 5.
    L.Bruschi and M.Santini, Vibrating Wire Viscometer, Rev. Sci. Instrum. 46: 1560 (1975)ADSCrossRefGoogle Scholar
  6. J.T.Tough, W.D.McCormick and J.G.Dash, Viscosity of Liquid Helium II, Phys. Rev, 132: 2373 (1963)ADSCrossRefGoogle Scholar
  7. 6.
    G.Stokes, Mathematical and Physical Papers, vol III, Cambridge University Press, London, (1922)Google Scholar
  8. 7.
    L.Bruschi, G.Mazzi, M.Santini and G.Torzo, The Behavior of the He4 Viscosity near the Superfluid Transition, J. Low Temp. Phys. 29: 63 (1977)ADSCrossRefGoogle Scholar
  9. P.S. Van der Gulik, R. Mostert and H.R. van der Berg, The Viscosity of Methane at 25 Cup to 10 kbar, Physica A 151: 153 (1988)ADSCrossRefGoogle Scholar
  10. 8.
    Fibers provided by R.Bacon of Amoco Performance Products Inc., Parma Technical Center, OhioGoogle Scholar
  11. 9.
    L.Bruschi, Behaviour of Shear Viscosity near the Critical Point of Carbon Dioxide, Il Nuovo Cimento 1: 361 (1982)CrossRefGoogle Scholar
  12. 10.
    For a different approach to this problem see for example A.M.Guenault, V.Keith, C.J.Kennedy, S.G.Musset and G.R.Pickett, The Mechanical Behavior of a Vibrating Wire in a Superfluid 3He-B in the Ballistic Limit, J. Low Temp. Phys 60: 511 (1986), and references therein.Google Scholar
  13. 11.
    J.Kestin and W.Leidenfrost, An Absolute Determination of the Viscosity of Eleven Gases over a Range of Pressures, Physica 25: 1033 (1959)Google Scholar
  14. L.Bruschi and G.Torzo, Method for Accurate Resonant Frequency Measurements with a Phase-Modulated Feedback Loop, Rev. Sci. Instrum 58: 2181 (1987)Google Scholar
  15. L.Bruschi, R.Storti and G.Torzo, A Simple Design for a Voltage Controlled Frequency Independent Phase Shifter, Rev. Sci. Instrum. 58: 1960 (1987).Google Scholar
  16. 13.
    J.G. Dash, On a Standarized Measure of Substrate Uniformity, in Phase Transition in Surface Films, J.G. Dash and J. Ruvalds Ed., Plenum Press, New York (1979).Google Scholar
  17. 14.
    A. Inaba and J.A. Morrison, The Wetting Transition and Adsorption/Desorption Hysteresis for the Methane/Graphite System, Chem.Phys.Lett 124: 361 (1986)ADSGoogle Scholar
  18. 15.
    T. Takaishi and Y. Sensui, Thermal Transpiration Effect of Hydrogen, Rare Gases and Methane, Trans.Far Soc 59: 2503 (1963)Google Scholar
  19. 16.
    F. Millot, Adsorption of the First Layer of Argon on Graphite, J.Physigue 40, L9 (1979)Google Scholar
  20. 17.
    B. Gilquin, Etude Thermodynamique de l’Adsorption Physique de l’Oxygene sur la Face de Clivage de Cristaux Lamellaires, Note CEA-CEN 2091 (1979)Google Scholar
  21. 18.
    A.D. MigoneJ.G. Dash, M.Schick and O.E. Vilches: Triple Point Wetting of Neon Films, Phys. Rev B 34, 6322 (1986)Google Scholar
  22. 19.
    J. Krim and A. Widom, Damping of a Crystal Oscillator by an Adsorbed Monolayer and its Relalation to Interfacial Viscosity, Phys. Rev B 38, 12184 (1988)Google Scholar

Copyright information

© Plenum Press, New York 1991

Authors and Affiliations

  • L. Bruschi
    • 1
  • G. Torzo
    • 1
  1. 1.Dipartimento di Fisica - Università di PadovaIstituto Nazionale Fisica della MateriaPadovaItaly

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