Phase-separation in ion-containing mixtures in electric fields

Details Phase-separation in ion-containing mixtures in electric fields Phase-separation in ion-containing mixtures in electric fields

2006-10-17

arxiv.org/abs/cond-mat/0610475v2

Proc. Acad. Natl. Sci. Vol 104, 7348 (2007).

Physics

Condensed Matter

Soft Condensed Matter

5 pages, one figure

Scientific paper

10.1073/pnas.0607746104

When a liquid mixture is subjected to external electric fields, ionic screening leads to field gradients. We point out that if the mixture is initially in the homogeneous phase, this screening can bring about a robust phase-separation transition with two main features: (i) the phase separation is expected to occur in any electrode geometry, and (ii) the voltage required is typically of the order of 1 V and even less. We discuss several applications of the effect relevant to the field of microfluidics, focusing on the creation of a nanometer-scale lubrication layer in the phase-separation process.

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