Using microfluidic tools, we will study the dynamic adsorption of particles to highly-curved interfaces inherent in microfluidic systems. Using a microtensiometer capable of measuring interfacial properties of small (radius ~10-5 m) droplets, we will measure the dynamic interfacial tension and interfacial elasticity during bulk diffusion of nanoparticles to an interface. In tandem with these experiments, we will use microfluidic devices to observe particle adsorption to a clean, mobile droplet interface under geometric confinement. We will show that the combined effects of fluid shear on the interface and  dynamic interfacial properties of the droplet lead to unique droplet shapes that relate to the particle coverage at the interface. Using this technique, we are capable of tailoring the surface concentration of particles on the interface.

Dynamic adsorption of micro- and nanoparticles to fluid-fluid interfaces in a microchannel

243rd National Meeting (2012)

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