Formation of Concentrated Nanoemulsions by Extreme Shear

We have systematically investigated the production of “nanoemulsions,” droplets of one liquid phase in another immiscible liquid phase that have diameters less than 100 nm

Kieche Meleson

2005

Scholarcy highlights

  • We have systematically investigated the production of “nanoemulsions,” droplets of one liquid phase in another immiscible liquid phase that have diameters less than 100 nm
  • Our approach relies on a combination of extreme shear due to multipass, high‐pressure microfluidic injection and systematic control of the emulsion's composition
  • We study the changes in the average radius, ⟨a⟩, as a function of the number of passes, driving injection pressure, droplet volume fraction, surfactant concentration, and droplet oil viscosity
  • At large droplet volume fractions φ≥0.65, we observe phase inversion, rather than a reduction in the droplet size. This provides evidence that droplet coalescence can occur during extreme shear, even when a significant excess of a strongly stabilizing surfactant is present
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