A simple method to measure the isosteric energy of adsorption

The effect of temperature on water vapour desorption isotherms can be described simply using the Clausius-Clapeyron equation and the isosteric energy of adsorption, the latter conventionally estimated using two (or more) isotherms obtained at different temperatures. This approach has some disadvanta...

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Bibliographic Details
Published in:Cement and concrete research 2021-09, Vol.147, p.106520, Article 106520
Main Authors: Poyet, Stéphane, Touzé, Gaëtan, Adia, Jean-Luc, Charpin, Laurent, Michel-Ponnelle, Sylvie
Format: Article
Language:English
Subjects:
Adsorption
Cement paste
Civil Engineering
Engineering Sciences
Génie civil nucléaire
Humidity
Isosteric energy
Isotherms
Materials
Relative humidity
Temperature
Temperature effects
Water vapor
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Summary:The effect of temperature on water vapour desorption isotherms can be described simply using the Clausius-Clapeyron equation and the isosteric energy of adsorption, the latter conventionally estimated using two (or more) isotherms obtained at different temperatures. This approach has some disadvantages, however, and this article puts forward a simple alternative methodology for characterising this isosteric energy experimentally. Our method is based on monitoring the relative humidity of a cementitious material heated under sealed conditions. The evolution of the relative humidity as a function of temperature makes it possible to directly evaluate the isosteric energy. In practice, the tests are performed using a cell of the type that is used for self-desiccation studies.
ISSN:0008-8846
1873-3948
DOI:10.1016/j.cemconres.2021.106520