Abstract
From her exhaustive X-ray studies of graphitized and non-graphitized carbons, Rosalind Franklin (1951), Franklin (1950, 1951,1953) and Harris (2001) deduced that pores in these materials exist as wedge shaped spaces in the interstices between graphitic micro-crystallites. In this paper we investigate the order-disorder transition of adsorbed argon in carbonaceous materials, modelled as a closed wedge formed by two sets of graphene layers. Despite its simplicity, the model captures the physics of adsorption in a non-uniform pore and gives rise to a rich adsorption behaviour. Our particular focus in this work is on the wetting/filling of argon and its variation with the wedge angle and temperature. We find that incomplete wetting occurs at temperatures below the roughening temperature, TR = 70 K, and that continuous wetting occurs above this temperature. We summarise our results as a phase diagram for wetting/filling of argon adsorption in graphitic wedges as a function of wedge angle and temperature.
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