Using the vibrating-wire microbalance technique we have found that superfluid ⁴He, normal fluid ⁴He, and ³He all wet graphite completely. Incomplete wetting above T_λ was simulated by intentionally introducing a temperature gradient in the apparatus. Data in the thick-film regime are found to be consistent with the Frenkel-Halsey-Hill model of adsorption. The graphite fiber surface has been characterized through volumetric adsorption isotherms, revealing additional surface area not previously accounted for by others using this technique.
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Zimmerli et al. (1988) studied this question.
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