Multilayer adsorption isotherms of para-hydrogen on graphite
| ISSN: |
1573-7357
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| Source: |
Springer Online Journal Archives 1860-2000
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| Topics: |
Physics
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| Notes: |
Abstract Adsorption isotherms of para-hydrogen adsorbed on graphite foam were measured for the temperature interval of 9 to 15 K up to about 25 layers, using the standard volumetric method. From these isotherms straight lines were obtained for ln(P 0/P) as a function ofd −3, d being the coverage. These plots obey an equation of the type ln(P 0/P)=ad−3+b. Considering capillary condensation and using the Frenkel-Halsey-Hill equation together with Kelvin's relation an average pore radius of (315±60) Å was found and the van der Waals potential calculated as (2.36±0.07)×10−12 erg Å3. From the data, there seems to be a transition at about 11 K, but it cannot be concluded definitely if it is a complete wetting transition. Whenever possible the obtained results were compared to existing data.
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| Type of Medium: |
Electronic Resource
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| URL: |