Critical wetting of graphite by krypton and xenon

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Abstract
Evidence is presented for the occurrence of a wetting transition in the adsorption of Kr and Xe on exfoliated graphite (Grafoil MAT). The estimated wetting temperatures are 82·95 ± 0·1 for Kr and 116·3 ± 0·1 K for Xe. In relation to the critical temperature T c of the bulk adsorbate, these temperatures correspond to T w/T c = 0·396 and 0·401 respectively. An earlier study of the adsorption of CH4 on the same substrate yielded T w = 75·5 ± 0·1 K and T w/T c = 0·397. The experiments consisted of precise measurements of adsorption isotherms at seven temperatures for Kr and at four temperatures for Xe up to the equivalent of as many as eleven layers adsorbed. Just as for the example of the CH4/gr aphite system [1], in the region T < T w, the results are described well by Here n a is the amount adsorbed (at temperature T) where the adsorption is observed to change from type I (complete wetting) to type II (incomplete wetting). The adsorption isotherms are consistent with those measured previously by others.

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