A Unique Feature of Ionic Diffusion-Controlled Reactions in Supercritical Fluid

Toshihiko Arita, Okitsugu Kajimoto

Research output: Contribution to journalReview articlepeer-review


Density dependence of the rate constants of diffusion-controlled ionic recombination reactions in supercritical (SC) fluoroform was investigated to explore the effect of the local density enhancement on diffusion-controlled reactions. For the ionic recombination, the effect was clearly detected as strong retardation of reaction rate near the critical density. On the other hand, for the radical self-termination, the effect was not detected. This difference must be due to the strong solute-solvent interaction between ionic species and solvent molecules. The local density around the charged molecules should be drastically enhanced by Coulomb interactions.

Original languageEnglish
Pages (from-to)37-44
Number of pages8
JournalReview of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu
Issue number1
Publication statusPublished - 2004
Externally publishedYes


  • Clustering
  • Dielectric constant
  • Diffusion-controlled reaction
  • Ionic recombination
  • Laser flash photolysis
  • Local density enhancement
  • Radical self-termination
  • Supercritical fluid
  • Viscosity

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics


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