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12 July 2020
 
  » arxiv » cond-mat/0506760

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Finite-size scaling and particle size cutoff effects in phase separating polydisperse fluids
Nigel B. Wilding ; Peter Sollich ; Moreno Fasolo ;
Date 29 Jun 2005
Subject Statistical Mechanics; Soft Condensed Matter | cond-mat.stat-mech cond-mat.soft
AbstractWe study the liquid-vapor phase behaviour of a polydisperse fluid using grand canonical simulations and moment free energy calculations. The strongly nonlinear variation of the fractional volume of liquid across the coexistence region prevents naive extrapolation to detect the cloud point. We describe a finite-size scaling method which nevertheless permits accurate determination of cloud points and spinodals from simulations of a single system size. By varying a particle size cutoff we find that the cloud point density is highly sensitive to the presence of rare large particles; this could affect the reproducibility of experimentally measured phase behavior in colloids and polymers.
Source arXiv, cond-mat/0506760
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