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Experimental Studies of Monodisperse Pickering Emulsions Stabilized by Laponite Clay

Experiments on oil-in-water Pickering emulsions stabilized by the disc-like synthetic clay mineral Laponite were performed. Magnetic resonance imaging was used to determine how the viscosity of the oil, the oil volume fraction and preparation parameters affected emulsion stability and droplet diameters. Droplet sizes increased with higher oil viscosity, and decreased with larger oil volume fraction, longer mixing times and higher mixing velocities. The emulsions formed were more stable under conditions where the colloidal particles were flocculated, and when high viscosity oil was used. Monodisperse emulsions to be studied with optical methods were made using microfluidic devices. An emulsion stable to coalescence was successfully made in a T-junction microcapillary, and deformation of droplets under external pressure was observed.