Mixture of particles and oil

The magnitude of will be determined by the nature of the antifoam. In this, as we have seen (see Chapter 4), there are two dominant factors—whether the capillary pressure in Plateau borders is sufficiently high to permit the antifoam entity to emerge into the air-water surface and whether, once emerged, the antifoam entity has the correct characteristics to cause foam film rupture. The factors intrinsic to the antifoam in this context depend on whether the antifoam consists of particles alone, oils alone, or mixtures of particles and oils. In the case of particles alone, the relevant factors are the particle size, geometry, and wettability together with the various colloidal interaction forces that conspire to produce the magnitude of... 

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