Diffusion-controlled hysteresis

Peter I. Ravikovitch, Alexander V. Neimark

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

A new model of time-dependent sorption-desorption hysteresis is presented. This type of hysteresis is not related to transitions between metastable adsorption states, which are a common cause of capillary condensation hysteresis in mesoporous materials. We show that time-dependent hysteresis is a consequence of slow kinetics and failure to reach equilibrium at given experimental conditions. The model of diffusion-controlled hysteresis (DCH) we developed is capable of predicting time-dependent experimental data. It allows one to estimate the characteristic diffusion. We show that DCH model time and the equilibrium sorption isotherms from non-equilibrium sorption/desorption measurements. The DCH model has been tested using experimental CO2 isotherms on polymeric and carbonaceous materials.

Original languageEnglish (US)
Pages (from-to)265-270
Number of pages6
JournalAdsorption
Volume11
Issue number1 SUPPL.
DOIs
StatePublished - Jul 1 2005
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Chemistry(all)
  • Surfaces and Interfaces

Keywords

  • Diffusion
  • Equilibrium
  • Hysteresis
  • Kinetics
  • Sorption

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