5 research outputs found
Influence of reservoir size on the adsorption path in an ideal pore
International audienceWe consider the influence of the relative size of the gas reservoir on the states visited by a simple fluid adsorbed in a nanopore of ideal geometry (a slit). We focus on the intermediate states that appear in between the main hysteresis branches comprising gaslike and liquidlike states and we study the adsorption and desorption paths actually followed by the system as one changes the reservoir size. We find that these paths may display discontinuous sections associated with transitions between different nonuniform states. We also discuss the stability of the states in such situations
Hierarchical Reference Theory of critical fluids in disordered porous media
We consider the equilibrium behavior of fluids imbibed in disordered
mesoporous media, including their gas-liquid critical point when present. Our
starting points are on the one hand a description of the fluid/solid-matrix
system as a quenched-annealed mixture and on the other hand the Hierarchical
Reference Theory (HRT) developed by A. Parola and L. Reatto to cope with
density fluctuations on all length scales. The formalism combines liquid-state
statistical mechanics and the theory of systems in the presence of quenched
disorder. A straightforward implementation of the HRT to the quenched-annealed
mixture is shown to lead to unsatisfactory results, while indicating that the
critical behavior of the system is in the same universality class as that of
the random-field Ising model. After a detour via the field-theoretical
renormalization group approach of the latter model, we finally lay out the
foundations for a proper HRT of fluids in a disordered porous material.Comment: 23 pages. Article for Luciano Reatto's festschrif
Contribution a l'etude theorique des phenomenes d'adsorption a l'interface solide-fluide
SIGLEAvailable from INIST (FR), Document Supply Service, under shelf-number : T 79714 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc