Solute-solvent size ratio dependence of the solute residual chemical research note potential in subcritical solvents

G. T. Gao, J. B. Woller, X. C. Zeng, W. Wang

Research output: Contribution to journalArticle

2 Scopus citations


We investigated the dependence of the solute residual chemical potential on soluteto-solvent molecule size ratio in infinitely dilute Lennard-Jones fluids. A minimum on the μAr∞BB ∼ (σABBB)3 curve has been found at high solvent densities ρσBB3 = 0•75 and 0•8 (σ and ε are the Lennard-Jones size and energy parameters, respectively, μAr∞ is the solute residual chemical potential in an infinitely dilute solution, A and B denote solute and solvent, respectively, and ρ is the solvent molecule density). Such a minimum commonly has been observed in supercritical fluids, but obtaining one from computer simulation of subcritical fluids is challenging since a very high solvent density or a large solute size is needed. This study seems to provide the first simulation evidence of such a minimum at a subcritical temperature. The position of this minimum is very sensitive to solvent density as well as temperature. An umbrella sampling Monte Carlo method was adopted to compute the solute residual chemical potentials in infinitely dilute solvents. BB A.

Original languageEnglish (US)
Pages (from-to)141-145
Number of pages5
JournalMolecular Physics
Issue number1
StatePublished - Jan 1 1997


ASJC Scopus subject areas

  • Biophysics
  • Molecular Biology
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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