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Phase transitions in simple and not so simple binary fluids
- Source :
- Journal of Physics: Condensed Matter. 15:S381-S386
- Publication Year :
- 2002
- Publisher :
- IOP Publishing, 2002.
-
Abstract
- Compared to pure fluids, binary mixtures display a very diverse phase behavior, which depends sensitively on the parameters of the microscopic potential. Here we investigate the phase diagrams of simple model mixtures by use of a microscopic implementation of the renormalization group technique. First, we consider a symmetric mixture with attractive interactions, possibly relevant for describing fluids of molecules with internal degrees of freedom. Despite the simplicity of the model, slightly tuning the strength of the interactions between unlike species drastically changes the topology of the phase boundary, forcing or inhibiting demixing, and brings about several interesting features such as double critical points, tricritical points, and coexistence domains enclosing `islands' of homogeneous, mixed fluid. Homogeneous phase separation in mixtures can be driven also by purely repulsive interactions. As an example, we consider a model of soft particles which has been adopted to describe binary polymer solutions. This is shown to display demixing (fluid-fluid) transition at sufficiently high density. The nature and the physical properties of the corresponding phase transition are investigated.<br />6 pages + 3 figures, presented at the 5th EPS Liquid Matter Conference, Konstanz, 14-18 September 2002
- Subjects :
- Physics
Phase transition
Phase boundary
Statistical Mechanics (cond-mat.stat-mech)
Degrees of freedom (physics and chemistry)
FOS: Physical sciences
Binary number
Condensed Matter - Soft Condensed Matter
Renormalization group
Condensed Matter Physics
Chemical physics
Phase (matter)
Soft Condensed Matter (cond-mat.soft)
General Materials Science
Condensed Matter - Statistical Mechanics
Topology (chemistry)
Phase diagram
Subjects
Details
- ISSN :
- 09538984
- Volume :
- 15
- Database :
- OpenAIRE
- Journal :
- Journal of Physics: Condensed Matter
- Accession number :
- edsair.doi.dedup.....2cf392d07c21222c18fee27c4427d661