Skip to main content
Log in

Adsorption of nitrogen, argon, and neon on sintered copper and of neon on argon-coated sintered copper at low temperatures

  • Published:
Journal of Low Temperature Physics Aims and scope Submit manuscript

Abstract

The results of measurements of adsorption isotherms are given for nitrogen, argon, and neon on bare sintered copper and on sintered copper covered with a monolayer of argon. The temperatures employed where 77.3 K for the N2 and argon, and 17.26, 20.22, 22.64, 25.71, and 27.00 K for the neon, and the pressure range was from 0.25 to 200 Torr. The sintered copper specimen was of mass 170 g, made with powder (Alcan Metal Powders, Inc., “Druid Copper,” grade MD60), which had an average particle size of 2 × 2 × 0.5 µ. The sintering was done at 650°C for 0.5 h. The bare surface area ε in m2/g, of the sintered copper specimen was found from the N2 adsorption isotherms at 77.3 K. This gave ε=0.41 m2/g, based on a molecular area of N2 of 13.8 Å2 (solid N2). The N2 and argon isotherms on the bare sintered copper at 77.3 K yielded values of the monolayer coverage ofV m =0.11 cm3(STP)/g for N2 andV m =0.11 cm3(STP)/g for argon. The neon results showed that at any given pressure and temperature the mass of neon adsorbed was less when the adsorption was on argon-coated copper than on bare copper. Calculations were made of the isosteric heat of adsorptionQ st for neon, and the results are presented graphically as functions of the coverage. For neon adsorption on the bare copper,Q st /R had a maximum value of about 390 K at a coverage of about 0.2 cm3(STP)/m2, and it decreased to about 275 K at 0.5 cm3(STP)/m2. For neon on the argon-coated copper,Q st /R had a maximum value of about 320 K- at the lowest coverages and fell to about 245 K at 0.5 cm3(STP)/m2. The shape of theQ st /R curve vs. coverage for neon indicated that the argoncoated copper was more homogeneous from an adsorptive point of view than the bare copper. TheQ st /R vs. coverage curves allowed an assessment to be made of the monolayer coveragesV m , which were 0.38 cm3(STP)/m2 for neon on the bare sintered copper and 0.34 cm3(STP)/m2 on the argon monolayer coated on the sintered copper. This indicated that the effective area for adsorption on the argon monolayer was 0.37 m2/g, which was 10% less than that for the bare copper. In addition, theQ st /R values at monolayer coverage were found to be 306 K on the bare copper and 275 K on the argon monolayer.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  1. John G. Daunt and Carol Z. Rosen,J. Low Temp. Phys. 3, 1 (1970).

    Google Scholar 

  2. John G. Daunt and Carol Z. Rosen,Proc. 5th Symp. Thermophysical Properties, ASME, 1970, p. 319.

  3. John G. Daunt and Carol Z. Rosen,Proc. 12th Intern. Conf. Low Temp. Phys., Kyoto, 1970, p. 829.

  4. H. van Dijk, M. Durieux, J. R. Clement, and J. K. Logan, NBS Monograph 10, Jan. 1960.

  5. F. Henning and J. Otto,Z. Physik. 37, 633 (1936).

    Google Scholar 

  6. W. D. McCormick, D. L. Goodstein, and J. G. Dash,Phys. Rev. 168, 249 (1968).

    Google Scholar 

  7. J. G. Daunt and E. Lerner,Proceedings of II International Symposium on Adsorption-Desorption Phenomena, Florence (Academic Press, New York, 1971).

  8. D. M. Young and A. D. Crowell,Physical Adsorption of Gases (Butterworths, London, 1962).

    Google Scholar 

  9. J. Borghs and A. van Itterbeek,Physica 7, 17 (1940).

    Google Scholar 

  10. J. L. Wallace and D. L. Goodstein,J. Low Temp. Phys. 3, 283 (1970).

    Google Scholar 

Download references

Author information

Authors and Affiliations

Authors

Additional information

Work supported by a contract with the Department of Defense (Themis Program) and with the Office of Naval Research and by a grant from the National Science Foundation.

Rights and permissions

Reprints and permissions

About this article

Cite this article

Lerner, E., Daunt, J.G. Adsorption of nitrogen, argon, and neon on sintered copper and of neon on argon-coated sintered copper at low temperatures. J Low Temp Phys 6, 241–250 (1972). https://doi.org/10.1007/BF00628310

Download citation

  • Received:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF00628310

Keywords

Navigation