Tuesday, February 27, 2007, 1:30 pm — Small seminar room, Bldg. 510
Charge plays an essential and well-documented role in aqueous complex
fluids. Electrostatic forces not only govern the structure and
interactions of single molecules, such as proteins and nucleic acids,
but they can also dominate the structure and stability of dispersions,
such as colloids and emulsions. We are investigating the role of charge
in a less familiar regime where the solvent is nonpolar. In the extreme
case, where the continuous phase is a simple nonpolar liquid
(epsilon=2), the electrostatic barrier to charge separation of simple
ions is about 50kT at room temperature. In this regime, surfaces remain
charge-neutral and the solvent insulates.
We engineer materials to bring the electrostatic barrier to charging ^?
or ^?Coulomb Blockade^? ^? closer to kT. The essential idea is to introduce
nanometer scale islands of high dielectric permeability into a nonpolar
fluid. By varying the concentration, size, and composition of these
Hosted by: Antonio Checco
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