Abstract
Mixture of Brij 92 (polyoxyethylene (2) oleyl ether) and Brij 96 (polyoxyéthylene (10) oleyl ether) in the HLB range 4.9 to 12.4 were used to stabilize mineral oil-in-water emulsions. Particle size, stability to centrifugation and zeta potential were measured as a function of HLB and the effect of change in pH of the emulsions on zeta potential observed over the range of HLB values. Maximal stability occurs at an HLB at which particle size is at a minimum but there is no evidence for a maximum in the zeta potential at the critical HLB as has been suggested by Becher and co-workers. Photomicrography and measurements of viscosity of the emulsions at HLB 6 indicate flocculation at pH 4 reversed at pH 9.5. The rapid increase in electrical conductivity of the emulsions at low HLB is explained qualitatively on the basis of the formation of continuous networks of flocculated particles prior to phase inversion.
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