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A hygrothermal modelling approach to water vapour sorption isotherm design for mesoporous humidity buffers

Sarce, Fernando; Hall, Matthew R.; Sangchoom, Wantana; Mokaya, Robert

A hygrothermal modelling approach to water vapour sorption isotherm design for mesoporous humidity buffers Thumbnail


Fernando Sarce

Matthew R. Hall

Wantana Sangchoom

Robert Mokaya


This paper describes the development of a design technique using hygrothermal numerical modelling for top-down predictive design and optimisation of water vapour sorption isotherms to match any humidity buffering application. This was used to inform the design and synthesis of two new mesoporous silica (MS) materials suitable for specific applications. To validate the technique, the new materials were experimentally assessed using gravimetric dynamic vapour sorption (DVS). The experimental isotherms closely matched the optimised isotherm predictions from the design stage, and a positive correlation was observed between the rate of change in adsorbed water content, ?w and the time taken to exceed the permissible upper limit of humidity, ?i,U in a closed environment. A positive non-linear correlation was determined between the interior volumetric moisture load, ?ml and the mass of adsorbent required to fully achieve humidity buffering between specified lower/ upper limits (?i,L and ?i,U). The kinetics of water vapour sorption/ desorption were found to have general agreement when using the current hygrothermal numerical model. Current hygrothermal models appear to significantly underestimate the rate of adsorption/ desorption in rapid-response mesoporous
silica type materials. This is perhaps largely due to the current lack of consideration for scanning curve prediction within hysteresis loops and so is a priority for future research.

Journal Article Type Article
Acceptance Date Mar 1, 2015
Online Publication Date Mar 7, 2015
Deposit Date Jul 1, 2016
Publicly Available Date Jul 1, 2016
Journal Microporous and Mesoporous Materials
Print ISSN 1387-1811
Electronic ISSN 1387-1811
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 211
Keywords Hygrothermal modelling
Water vapour isotherm
Isotherm design
Humidity buffering
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