(A) study on the particle size effect on the structural properties of nonadditive hard sphere mixtures

Abstract

The change of size ratio ($d_{22}/d_{11}$) affects on the trend of homocoordination and heterocoordination in the asymmetric nonadditive hard-sphere (ANAHS) mixtures characterized by unequal collision diameters between like species ($d_{11}≠d_{22}$), and nonadditive collision diameter between unlike species ($d_{12}$). The size effect on the structural properties of ANAHS mixtures have been investigated with Monte Carlo (MC) simulations over a wide range of density, nonadditivity (α), and $d_{22}$.The qualitative analysis indicates that some differences exist such as variation on the preference of the ANAHS systems to the homo- or heterocoordination because of the asymmetricity of collision diameters between like species, though similar tendencies to that of symmetric nonadditive hard-sphere (SNAHS) mixtures remain such as fluid-fluid phase separation at high densities when α > 0