Abstract
The Rosenfeld density functional approximation, which is based on the fundamental geometric measures of the particles, has been employed to study the local size segregation and size selectivity in the adsorption of a multi-component hard sphere fluid confined in a spherical pore. The calculated results have shown that the preferred species in a spherical pore depend strongly on the size ratio of mixture as well as the spherical pore size and bulk packing fraction. The local relative concentration oscillates with a spatial period close to the diameter of the large particle as does the equilibrium density distribution. The pore average size distribution for large particles increases with increasing spherical pore size and bulk packing fraction. This result suggests that the structural properties of a multi-component (or poly-disperse) hard sphere fluid confined in a spherical pore also resembles those of confined binary and ternary hard sphere fluids.
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