Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2012-01-02
Physics
Condensed Matter
Statistical Mechanics
Scientific paper
Equation of state for systems with particles self-assembling into aggregates is derived within a mesoscopic theory combining density functional and field-theoretic approaches. We focus on the effect of mesoscopic fluctuations in the disordered phase. The pressure-volume fraction isotherms are calculated explicitly for two forms of the short-range attraction long-range repulsion potential. Mesoscopic fluctuations lead to increased pressure in each case, except for very small volume fractions. When large clusters are formed, the mechanical instability of the system is present at much higher temperature than found in mean-field approximation. In this case phase separation competes with formation of lyotropic liquid crystals. In the case of small clusters no mechanical instability associated with separation into dilute and dense phases appears.
Ciach Alina
Patsahan Oksana
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