Thermodynamics of Vapour Sorption in Capillaries Sample Clauses

Thermodynamics of Vapour Sorption in Capillaries. By including physical adsorption into the thermodynamic treatment of capillary condensation and evaporation and putting forward the Xxxxx Maximum Work Principle, Broekhoff developed the formal framework for estimating pore size distributions of mesoporous solids. It appears that Xxxxxx equation cannot be used as such but should be corrected to account for the multilayer adsorption which takes place even on non porous solids and is represented by the standard isotherms. This multilayer adsorption depends on the adsorbate-adsorbent interactions (as expressed by the CBET constant) but also on the curvature radius of the surface i.e. on the shape and the size of the pores in which the adsorption takes place. Although Broekhoff and de Boer published separate papers on adsorption in- and desorption from capillaries of various shapes, it is possible to summarize their results [38] by introducing a shape factor, f, which has to be taken equal to l for slit shaped pores, to 2 for tubular type pores and to 3 for "ink-bottle" type pores or spheroidal cavities. In these conditions xx Xxxxxxxxx-xx Xxxx model (BdB model) leads to the following results:  the thickness t of the adsorbed layer in a pore of radius rp is given at a relative pressure p/ps, by:
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