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Soret Effect in Interacting Micellar Solutions

2002; American Physical Society; Volume: 88; Issue: 20 Linguagem: Inglês

10.1103/physrevlett.88.208302

1092-0145

Roberto Piazza, Andrea Guarino,

Electrostatics and Colloid Interactions

We show that electrostatic effects have a dramatic influence on thermal diffusion of charged micelles. In the dilute regime, the Soret coefficient strongly decreases with the solution ionic strength, and scales as the square of the Debye-Hückel length. Yet, collective effects yield a reversed scenario even at fairly low surfactant concentration. We find that single-particle behavior can be explained using an interfacial tension mechanism proposed by Ruckenstein, which also fairly accounts for collective effects and opens the way to a general picture of thermal diffusion in disperse systems.