Thursday, October 19, 2006

Rheology at the Edge

I sat in a talk yesterday by Gerry Fuller (Stanford U) on Interfacial/Multiphase Rheology. I'll leave a few of my biggest take-aways here over the next few posts.

While it makes sense, I had never thought about how a particle will likely not be located evenly between the two fluids, but will be more or less in one of the liquids depending on the surface energies involved (other specific attraction/repelling forces are being ignored). These particles can be used to stabilize emulsions and can be extremely difficult to dislodge if they are micron sized. The energy required is on the order of 10^6 kT, but the energy goes the square of the particle diameter. Nanoparticles then, a much easier to remove.

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