Abstract
A simple model based on an approximation of the dropletlike model is formulated for studying adsorption of fluids into cylindrical pores. This model yields a nearly universal description of capillary condensation transitions for noble gases confined by alkali metals. The system's thermodynamical behavior is predicted from the values of two dimensionless parameters: D* (the reduced asymptotic strength of the fluid-adsorber interaction, a function of temperature) and R* (the reduced radius of the pore). The phenomenon of hysteresis inherently related to capillary condensation is discussed. The connection to a previously proposed universality for cylindrical pores is also established.
Highlights
Capillary condensationCCconsists of liquid condensation in porous media at pressures less than saturated vapor pressureSVP
A simple model based on an approximation of the dropletlike model is formulated for studying adsorption of fluids into cylindrical pores
The phenomenon of hysteresis inherently related to capillary condensation is discussed
Summary
Capillary condensationCCconsists of liquid condensation in porous media at pressures less than saturated vapor pressureSVP. ͓9͔, its application to curved geometries where the surface energy plays an enhanced role became of interest Such a description has been very recently utilized for studying the phase behavior of fluids in a regular array of infinitely long,. In the latter phase the fluid form bridges or ‘‘necks’’ between neighboring cylinders Along this line of investigations, in the present work we explore the possibility of applying a simple model for CC like that proposed in Ref. As numerical applications we examined the adsorption of inert gases into pores of alkali metals. These systems are very interesting due to the fact that such substratesCs, Rb, K, Na, and Liare much weaker attractors than surfaces of materials such as Al, Au, or graphite.
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