A method to simultaneously determine sorption isotherms and sorption enthalpies with a double twin microcalorimeter

Lars Wadsö, Natalia Markova

Research output: Contribution to journalArticlepeer-review

Abstract

Sorption of vapors of water, ethanol, and other liquids on solids like pharmaceuticals, textiles and food stuffs are of both practical and theoretical importance. In this article we present a technique to simultaneously measure sorption isotherms and sorption enthalpies. The sample is contained in one end of a sorption vessel. In the other end a vaporizable liquid is introduced to start the measurement. Mass transfer from the liquid to the sample is by vapor diffusion and the rate of mass transfer is calculated from the measured thermal power of vaporization. Simultaneously, the thermal power of sorption is measured and from this one may calculate the differential enthalpy of sorption. The thermal power measurements are made by inserting the sorption vessel in an isothermal double twin microcalorimeter.
Original languageEnglish
Pages (from-to)2743-2754
JournalReview of Scientific Instruments
Volume73
Issue number7
DOIs
Publication statusPublished - 2002

Subject classification (UKÄ)

  • Materials Engineering
  • Physical Chemistry

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