Crystallization Kinetics and Morphology in Phase Separating and Sedimenting Mixtures of Colloidal Spheres and Rods
JOURNAL OF PHYSICAL CHEMISTRY B(2004)
摘要
The crystallization of sedimentating silica spheres in the presence of silica-coated boehmite rods in low-salt dimethylformamide is studied by means of confocal scanning laser microscopy. As expected, addition of rods gives rise to a net attraction due to the depletion effect. Upon increasing rod volume fractions, below a predicted equilibrium binodal, crystalline ordering of the spheres takes place faster but gives cause for more grain boundaries. Addition of rods at volume fractions in the theoretically predicted two-phase region gives rise to aggregation and glasslike sediments. We explain these results on the basis of the different gravitational lengths and sedimentation rate of both species: higher rod concentrations drive the system quicker into the two-phase region of the predicted phase-diagram.
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关键词
phase diagram,phase separation,volume fraction,grain boundary
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