Phase equilibria and fractionation in a polydisperse fluid
نویسندگان
چکیده
منابع مشابه
Phase Equilibria of Polydisperse Colloids
A set of colloidal particles (be they sterically-or charge-stabilized) can never be made truly identical. They are polydisperse in their sizes (or charges), and their interactions are a function of that property. A truly polydisperse system in the thermodynamic limit contains innnitely many species. Therefore, calculations of phase equilibria involve innnitely many coexistence constraints (a di...
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We dynamically simulate fractionation (partitioning of particle species) during spinodal gas-liquid separation of a size-polydisperse colloid, using polydispersity up to ~40% and a skewed parent size distribution. We introduce a novel coarse-grained Voronoi method to minimise size bias in measuring local volume fraction, along with a variety of spatial correlation functions which detect fractio...
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Many materials containing colloids or polymers are polydisperse: they comprise particles with properties (such as particle diameter, charge, or polymer chain length) that depend continuously on one or several parameters. This review focuses on the theoretical prediction of phase equilibria in polydisperse systems; the presence of an effectively infinite number of distinguishable particle specie...
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Using kinetic Monte Carlo simulation, we model gas-liquid spinodal decomposition in a size-polydisperse square well fluid, representing a "near-monodisperse" colloidal dispersion. We find that fractionation (demixing) of particle sizes between the phases begins asserting itself shortly after the onset of phase ordering. Strikingly, the direction of size fractionation can be reversed by a seemin...
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It is shown that the van der Waals free-energy of polydisperse fluids, as introduced previously ( L. Bellier-Castella, H. Xu and M. Baus, J. Chem. Phys. 113, 8337 (2000) ), predicts that for certain thermodynamic states (e.g. low temperatures and large polydispersities) the ordinary two-phase coexistences become metastable relative to a fractionation of the system into three phases, reducing th...
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ژورنال
عنوان ژورنال: Europhysics Letters (EPL)
سال: 2004
ISSN: 0295-5075,1286-4854
DOI: 10.1209/epl/i2004-10064-2