  We study the structure and interfacial properties of model athermal mixtures
of colloids and excluded volume polymers. The colloid particles are modeled as
hard spheres whereas the polymer coils are modeled as chains formed from
tangentially bonded hard spheres. Within the framework of the nonlocal density
functional theory we study the influence of the chain length on the surface
tension and the interfacial width. We find that the interfacial tension of the
colloid-interacting polymer mixtures increases with the chain length and is
significantly smaller than that of the ideal polymers. For certain parameters
we find oscillations on the colloid-rich parts of the density profiles of both
colloids and polymers with the oscillation period of the order of the colloid
diameter. The interfacial width is few colloid diameters wide and also
increases with the chain length. We find the interfacial width for the end
segments to be larger than that for the middle segments and this effect is more
pronounced for longer chains.
