Abstract
The sensitivity of the theoretical spinodal curve deduced from the osmotic equilibrium equation for asymmetric hard-sphere mixtures is examined by evaluating the free-volume fraction from three expressions of the excess chemical potential. The conditions for predicting a reduction of the stability domain with increasing asymmetry are discussed. The necessity of modifying this approach in the presence of attractions between the smaller species is underlined. \textcopyright{} 1996 The American Physical Society.
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