Smooth Particles with Edges in Presence of Spread Oil Layers

4 Smooth Particles with Edges in Presence of Spread Oil Layers 

Examination of Table 4.11 reveals that, for example, if O w 15° in the absence of an oil layer, then none of the configurations j = 3-5 will result in pseudoemulsion film rupture. The presence of the oil layer would, however, result in pseudoemulsion film rupture in all cases provided Oqw 90° (where of course we must have Oqw 135° if configuration 7 = 4 is to occur at all). Moreover, if 0 15°, then as we have seen, there exists no configuration at the air-water surface that would permit rupture of air-water-air foam films (see Table 4.6). The presence of a spread oil layer is therefore seen to expand the circumstances in which oil-particle antifoam synergy is to be expected relative to those expected in the absence of a spread layer. 

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