Abstract
AbstractThe influence of emulsion pH and temperature on the rheological behavior of adhesive oil‐in‐water (o/w) emulsions stabilized with an anionic surfactant (sodium dodecyl benzene sulfonate, SDBS) was studied. The flow properties of emulsions as a complex fluid were investigated using steady and dynamic rheometry for characterization of non‐Newtonian behavior. Emulsion pH was varied from 2 to 12 and temperature was varied from 20 to 50 °C, respectively. The influences of the above‐mentioned variables on the rheology of o/w emulsion were studied using steady‐shear and dynamic oscillatory experiments. Various viscosity models (2, 3, and 4 parameter rheological model) were used to predict the rheological parameters. An increase in the pH of the emulsion led to an increase in the emulsion stability, viscosity, and viscoelastic properties ( G′, G″, η*, and tan δ), and a decrease in the mean droplet size of the emulsion. A decrease in the temperature yields higher values of steady‐shear viscosity and viscoelastic properties upon a decrease in droplet size. Emulsions were characterized as flocculated structured liquid exhibiting a characteristic crossover frequency ( ω*) within the range of angular frequency studied in oscillatory measurements. Overall, emulsions exhibited non‐Newtonian shear‐thinning behavior and the synergy of pH and temperature significantly influences the emulsion rheology.
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