Adsorption isotherms of 4He on Grafoil coated with a monolayer of neon were made for the temperature range of 2–10 K and in the pressure range of 0.10–15.00 Torr, using a standard volumetric method. From these isotherms the isosteric heats of adsorption were calculated as a function of coverage. The binding energy of 4He on Ne was obtained from the isosteric heat for V → 0, yielding a value of 39.4 K. The differential molar entropy and the internal molar energy were calculated as a function of coverage. A comparison of monolayer coverage obtained by analyzing different procedures is presented. Whenever possible the results are compared with theoretical evaluations and previous experimental data.
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Work supported by FINEP, CNPq, and CEPG. Part of the Cooperative Program UFRJ/Stevens Institute of Technology, sponsored by CNPq/NSF International Program.
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Hanono, F., Lerner, E. Adsorption of 4He on neon-coated exfoliated graphite. J Low Temp Phys 41, 629–638 (1980). https://doi.org/10.1007/BF00114369
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DOI: https://doi.org/10.1007/BF00114369