Physical adsorption of gases at high pressure: III. Adsorption in slit-like pores

A grand canonical ensemble Monte Carlo study is made of the adsorption of a gas of simple molecules in the space between two infinite, flat, parallel surfaces (slit-like pores) as a function of their separation, h, at various temperatures. Above the critical temperature the overall shape of the adsorption isotherm is independent of h but both the maximum adsorption and the pressure, at which the maximum occurs, decrease as h decreases. Below the critical temperature the adsorption isotherm follows that obtained for an isolated surface up to a pressure p 1 beyond which the adsorption excess increases sharply with pressure to a plateau value. This rapid increase is interpreted in terms of condensation of the gas in the cavity between the surfaces, i.e. capillary condensation. As h is decreased the value of p 1 decreases. When h is comparable with the diameter of the adsorbate molecules the cavity is full at all readily attainable pressures. The results are further interpreted in terms of the singlet distrib...

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