Criticality and phase separation in a two-dimensional binary colloidal fluid induced by the solvent critical behavior
journal contributionposted on 03.07.2013, 14:09 by O. Zvyagolskaya, Andrew Archer, C. Bechinger
We present an experimental and theoretical study of the phase behavior of a binary mixture of colloids with opposite adsorption preferences in a critical solvent. As a result of the attractive and repulsive critical Casimir forces, the critical fluctuations of the solvent lead to a further critical point in the colloidal system, i.e. to a critical colloidal-liquid–colloidal-liquid demixing phase transition which is controlled by the solvent temperature. Our experimental findings are in good agreement with calculations based on a simple approximation for the free energy of the system.
- Mathematical Sciences