Electrostatics at the oil–water interface, stability, and order in emulsions and colloids

Leunissen et al. 10.1073/pnas.0610589104.

Supporting Information

Files in this Data Supplement:

SI Movie 1
SI Movie 2
SI Movie 3




SI Movie 1

Movie 1. Electric field-driven particle adsorption. Confocal microscopy movie (~4 times real time) showing a water droplet on the sample cell wall, which is subjected to a static electric field (~10 V/mm, top to bottom). The field drives the positively charged colloidal particles from the bulk suspension, through the depleted zone, toward the oil-water interface. The immobile particles in the background are stuck to the glass.





SI Movie 2

Movie 2. Confined colloidal Wigner crystal. Confocal microscopy movie showing a sequence of slices through a particle-containing oil droplet in water. Note that the particles making up the 2D crystal near the inner surface and the enclosed 3D Wigner crystal display Brownian motion.





SI Movie 3

Movie 3. Particle transport conduit. Confocal microscopy movie (~2 times real time) showing how particles, sitting at the interface between oil and a "line" of water, are transported along the surface. We are looking from above, on top of a glass slide that is fully immersed in the oily colloidal dispersion. On the slide resides a rather flat and elongated (line-shaped) drop of water, which runs from left to right and is centered in the middle of the frame. This water line was made by lightly scratching the slide with a diamond pen and then quickly dipping it in water. After that it was submerged in the colloidal dispersion, providing the mobile particles on the interface. The surrounding immobile particles are stuck to the glass substrate. Note that because of the small curvature of the water droplet the height difference between the water-oil interface and the glass slide is small, so that all particles (mobile and immobile) appear to be in the same plane (although the slight difference in intensity indicates that not all particles are exactly in focus). The driving force is simple fluid flow, but an electric field could be used as well (as in Movie 1).

This Article

  1. Published online before print February 16, 2007, doi: 10.1073/pnas.0610589104 PNAS February 20, 2007 vol. 104 no. 8 2585-2590
  1. OA Abstract
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  3. OA Full Text
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