Effect of repulsive and attractive interactions in the adsorption ofconfined polydisperse fluids

Abstract

A density functional perturbative approximation, which is based on the pairdistribution function, has been developed to investigate the influence ofattractive and repulsive interactions on the density behaviour of a confinedpolydisperse fluid. The calculated result shows that the attractive andrepulsive interactions in the model potential are strongly affected on theadsorption of a confined polydisperse fluid as well as the cavity size andparticle size ratio. The attractive interaction in a polydisperse square-wellsystem increases the pore average mole fraction for small particles in acircular cavity. Whereas a repulsive interaction in a polydispersesquare-shoulder system decreases the pore average mole fraction for smallparticles. The local relative concentration oscillates with a spatial periodclose to the diameter of a large particle as well as the equilibrium densitydistribution does.