2007 NSTI Nanotechnology Conference and Trade Show - Nanotech 2007 - 10th Annual

Forming nanoemulsion debye glasses: irreversible elastic vitrification through extreme emulsification

T.G. Mason
University of California- Los Angeles, US

Keywords:
nanoemulsions, high-throuput production, Debye glass, disordered repulsive droplets

Abstract:
We have systematically investigated the high-throughput production of ìnanoemulsionsî, droplets of one liquid phase in another immiscible liquid phase that have radii less than 100 nm. Extreme extensional shear flows created by a high-pressure microfluidic device rupture silicone oil-in-water emulsion droplets that are stabilized by sodium dodecylsulfate. This rupturing leads to elastic vitrification at surprisingly low droplet volume fractions, much lower than that associated with maximal random jamming. We study the linear viscoelasticity of glassy nanoemulsions and show that, by contrast to microscale emulsions, the Debye-screened repulsive interaction potential plays a key role in creating this surprisingly large elasticity. A jammed nanoemulsion Debye glass of disordered repulsive droplets is an excellent example of a soft material that has rheological properties which can be irreversibly changed from liquid-like to solid-like by applying extreme shear without altering the composition.

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