Abstract

Water-in-diesel emulsions have garnered attention in recent years as a potential route to mitigate vehicular pollution. In this work, the formation, flow behavior, and microstructure of water-in-diesel microemulsions using an anionic surfactant, sodium bis(2-ethylhexyl) sulfosuccinate (AOT), is investigated and compared with the water–decane–AOT microemulsion system. Rheological measurements on the microemulsions indicate Newtonian behavior over a moderate range of shear rate. The viscosity of the microemulsions shows a weak dependence on the molar ratio of water-to-surfactant (ω) but increases significantly with the increase in the dispersed phase volume fraction (Φ). Dynamic light scattering (DLS) investigation of the microemulsions indicates a single exponential decay of the intensity autocorrelation functions over a wide range of water and AOT concentrations, indicating that the dispersed phase consists of a monodispersed population of water droplets. Results suggest that optimizing ω can regulate the...

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