Heat of immersion studies on characterized silicas

A. J. Tyler, J. A.G. Taylor, B. A. Pethica, J. A. Hockey

Research output: Contribution to journalArticle

28 Scopus citations

Abstract

A differential wetting calorimeter suitable for measuring heats of immersion of solids in either aqueous solutions or dry organic solvents is described. With this apparatus the heats of immersion of a number of well-characterized Aerosil silicas in both water and benzene have been measured. The heat of immersion of unannealed silicas in water is dependent on the temperature of the wetting process. For annealed silicas this temperature dependence is not always present. These results indicate that the heat of wetting contains terms which reflect disturbances of the liquid layers surrounding the solid. Also, for microporous adsorbents the heats of wetting cannot be reliably expressed in terms of heats per unit area of surface when the area is determined by the B.E.T. method.

Original languageEnglish (US)
Pages (from-to)483-492
Number of pages10
JournalTransactions of the Faraday Society
Volume67
DOIs
StatePublished - Dec 1 1971
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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