Fugacity Coefficients for Free Radicals in Dense Fluids: HO2 in Supercritical Water

Tahmid I. Mizan, Phillip E. Savage, Robert M. Ziff

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


The fugacity coefficients of the hydroperoxyl radical in supercritical water are estimated through molecular simulations. A potential function for the radical is first derived from ab initio self-consistent field molecular orbital calculations at the unrestricted Hartree-Fock level and from data in the literature. Molecular dynamics simulations of the hydroperoxyl radical are then performed in supercritical water and the fugacity coefficient of the radical is calculated by the free-energy perturbation method using the dynamic coupling parameter window-modification technique. The values of the fugacity coefficients at 773 K differ from unity. This methodology facilitates the incorporation of thermodynamic nonidealities in mechanism-based kinetic models for free-radical reactions in supercritical water.

Original languageEnglish (US)
Pages (from-to)1287-1299
Number of pages13
JournalAIChE Journal
Issue number5
StatePublished - May 1997

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Environmental Engineering
  • Chemical Engineering(all)


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