(475d) Apparent Microrheology Of Oil-Water Interfaces By Single Particle Tracking

We investigate the dynamics of charged microparticles at polydimethylsiloxane (oil) - water interfaces using Pickering emulsions as an experimental template. The mobility of the charged particles depends largely on the viscoelastic properties of the oil phase and the wettability of the solid particles. More importantly, we have explored the potential of developing one-particle microrheology at liquid-liquid interfaces. The complex, loss, and storage moduli of oil-water interfaces as a function of frequency measured from microrheology are compared with those of bulk oils measured from a conventional rheometer and developed bulk microrheology. The nature of the tracer particles plays an important role in one-particle microrheology at liquid-liquid interfaces, especially when the oil phase is viscoelastic.