This time constant is much lower for a low-molecular-weight surfactant compared to oligomeric surfactants. The role of a surfactant consists in varying the characteristic time constant for the rate of crystallization. It was proven that the general relationship between the growth of the yield stress and the degree of crystallization can be formulated for all surfactants studied in the work. Moreover, the Kholmogorov-Avrami kinetic equation with an unusually high exponent value equal to 6 is also applicable to different systems. It was shown that the originally proposed mechanism of crystallization, which suggested that growing crystals break through interfacial layers, was valid for all highly concentrated emulsions under investigation.
This study is devoted to the development of this investigation and based on involving different surfactants and various concentrations of surfactants. The principal features of crystallization of these systems were studied by as earlier. Instability of highly concentrated emulsions of the water-in-oil type which were investigated in this work is related to the existence of the internal phase as an oversaturated salt solution in water.
*Department of Civil Engineering, Faculty of Engineering, Cape Peninsula University of Technology, PO Box 652, Cape Town 8000, Republic of South Africa **Department of Chemistry, NMMU, PO Box 77000, Port Elizabeth 6031, Republic of South Africa Поступила в редакцию г. INSTABILITY OF HIGHLY CONCENTRATED EMULSIONS WITH OVERSATURATED DISPERSED PHASE.
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