Effect of Disperse Phase Volume Fraction

The LSW theory assumes that there are no interactions between droplets and, therefore, is limited to low disperse phase volume fractions. At higher volume fractions the rate of ripening is dependent on the interaction between diffusion spheres of neighboring particles. In general it is expected that emulsions with higher volume fractions of disperse phase will have broader particle size distributions and faster absolute growth rates than those predicted by LSW theory. This has in fact been verified experimentally for cobalt grains. The volume fraction [Pg.298]

A strong dependence on volume fraction has been observed for fluorocarbon-in-water emulsions. For example, Ni et al, found a ca. three-fold increase in or in going from tp — 0.08 to 0.52 for concentrated emulsions of perfluorooctyl bromide. Trevino et al. also observed the dependence of o) on f , and in addition verified the cubic scaling and time independence of the distribution function for similar concentrated perfluorooctyl bromide emulsions. [Pg.299]

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