Polydisperse fluid in contact with a semipermeable membrane

Using density functional theory developed by Rosefeld, a model polydisperse fluid has been studied in contact with a membrane permeable to some compon ents of the fluid. Calculations were carried out for three kinds of polydis perse fluid, each characterized by a different distribution of particle siz es. The structure of fluid has been evaluated on both sides of the membrane , plus the distribution of the particles in bulk fluid and in the surface l ayers. The adsorption and osmotic pressure in the system have been calculat ed.