(360e) Factors Affecting the Transient Stability of Solid Stabilized Emulsions

Emulsions are commonly found in energy and pharmaceutical industries. The presence of solid particle is known to stabilize emulsions. Fundamental insight on the transient stability of concentrated emulsions stabilized using solid particles is critical to manage these processes. This work focuses on developing a fundamental relationship between the stability of emulsions and the interfacial properties. In this work, nuclear magnetic resonance (NMR) has been utilized to characterize concentrated emulsions over time. A series of experiments were conducted on emulsions prepared using model oils with well-characterized surfactants and solid nanoparticles to elucidate the impact of stabilizer type on dynamic emulsion behavior. It was found that the presence of salts enhanced the stability of water-in-oil emulsions stabilized using silica nanoparticles while an increase in pH of the water phase led to destabilization of solid stabilized water-in-oil emulsions. In addition, the effect of salinity and pH on oil-in-water emulsions was also investigated. Dynamic oil−water interfacial tension and rheological measurements were performed to characterize the interfacial and rheological properties of concentrated water-in-oil emulsions stabilized using solid particles. In addition, the difference in interfacial and rheological properties of water-in-oil emulsions stabilized using asymmetric and completely spherical silica nanoparticles were investigated.