Two-phase mixtures of diesel fuel and aqueous ethanol were microemulsified and data were collected on rheological properties, densities, water tolerance and critical solution temperatures. For the detergentless system of diesel fuel, aqueous ethanol and butanol it was found that the relative viscosity varied directly with the volume percent of the dispersed water phase and approximates Einstein's formula. With ionic systems it was found that relative viscosities varied with increasing volume percent of dispersed water by values greater than those predicted by Brinkman and Roscoe for suspensions of diverse particle size. Water tolerances for ionic systems were greater than those observed with 1-butanol. The nature of the surfactant and its concentration determine to a large degree the microemulsion's physical properties.
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Schwab et al. (1982) studied this question.
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