화학공학소재연구정보센터
Journal of Chemical Physics, Vol.120, No.2, 1097-1104, 2004
Phase behavior of binary mixtures of sterically stabilized colloids with large size asymmetry
Experimental phase diagrams of three types of mixtures of sterically stabilized colloids are presented. The size ratios are kept similar, 0.15less than or equal toxiless than or equal to0.17, while the thickness and the chemical nature of the steric layers are varied. For all particles their effective volume fractions are calculated from their hydrodynamic radii. When their phase behavior is expressed in this way, the experimental liquidus curves all lie slightly above recent computer simulation predictions for the fluid-solid binodal of additive hard sphere mixtures. No dramatic shift of the experimental liquidus curves due to nonadditive particle interactions is observed. The dense phase is in all cases solid, with crystallites of the large spheres visible in some samples. (C) 2004 American Institute of Physics.