Simple Emulsions Stabilized by Solid Particles

The surface-averaged final diameter Dsf can be easily controlled by adjusting the amount of particles. Because the solid particles are irreversibly adsorbed at the oil-water interface, the inverse average droplet diameter varies linearly with the amount of particles according to the simple equation  

In Eig. 5.14 the evolution of y is reported as a function of the degree of surface coverage. The degree of surface coverage t is defined as the ratio of the particle density at any time to the final particle density. It can also be expressed as  

It is argued that the kinetics of the limited coalescence process is determined by the uncovered surface fraction 1 - t and by the rate of thinning (drainage) of the films formed between the deformable droplets [46,47], The homogeneous and monodisperse growth generated by limited coalescence is intrinsically different from the polydisperse evolution observed for surfactant-stabilized emulsions. As noted by Whitesides and Ross [48], the mere fact that coalescence halts as a result of surface saturation does not provide an obvious explanation of the very 

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