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

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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.
4 pages, three figures

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Soft Condensed Matter

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http://salesiana.dossiersoluciones.com/handle/123456789/25435

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0412185
 http://arxiv.org/abs/cond-mat/0412185
 (in extended form) Langmuir v21 pp4881-4887 (2005)

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arXiv