Evaluation of liquid-vapor density profiles for associating fluids in pores from density-functional theory

Using density-functional theory we calculate density profiles of an associa ting fluid in slit like pores as functions of two variables: The distance f rom the pore wall and the distance along the pore axis. Attention is focuse d on evaluation of the profiles characterizing the coexistence between two confined phases. We also calculate changes in the grand canonical potential connected with the formation of an interface between two coexisting confin ed phases. Specific calculations have been carried out for the associating, chain forming Lennard-Jones fluid adsorbed in a slitlike pore. (C) 2000 Am erican Institute of Physics. [S0021- 9606(00)51746-2].