Reverse Micelles Enable Strong Electrostatic Interactions of Colloidal Particles in Nonpolar Solvents

Details Reverse Micelles Enable Strong Electrostatic Interactions of Colloidal Particles in Nonpolar Solvents Reverse Micelles Enable Strong Electrostatic Interactions of Colloidal Particles in Nonpolar Solvents

2004-12-08

arxiv.org/abs/cond-mat/0412185v2

(in extended form) Langmuir v21 pp4881-4887 (2005)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, three figures

Scientific paper

While the important role of electrostatic interactions in aqueous colloidal suspensions is widely known and reasonably well-understood, the relevance of charge in nonpolar suspensions remains mysterious. We demonstrate that particles can have surprisingly strong electrostatic interactions in low dielectric constant environments when ions are solubilized by reverse micelles. A simple thermodynamic model, relating the structure of the micelles to the equilibrium ionic strength, is in good agreement with both conductivity and interaction measurements. Since dissociated ions are solubilized by reverse micelles, the entropic incentive to charge a particle surface is qualitatively changed, and surface entropy plays a important role.

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