Pickering emulsions use solid particles, instead of surfactants, as emulsion stabilizers. Here we employ Pickering emulsions as a new and convenient model system to investigate the dynamics of microparticles at liquid-liquid interfaces. Using confocal microscopy, we investigate the influences of liquid phase viscosity, cluster size, and temperature on the diffusion of particles at the interfaces. More importantly, we have explored and validated one-particle and two-particle interfacial microrheology at polydimethylsiloxane (oil)-water and polymer-polymer interfaces. In contrast to one-particle (1P) interfacial microrheology in which the measured Theological results depend largely on the surface chemistry of tracer particles, the two-particle (2P) tracking significantly minimizes the tracer particle effect. Finally, we perform molecular dynamics (MD) simulations to facilitate the fundamental understanding of nanoparticle dynamics and nanorheology at liquid-liquid interfaces.
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