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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

Authors

Fernando Sarce emxfs@nottingham.ac.uk

Matthew R. Hall Matthew.Hall@nottingham.ac.uk

Wantana Sangchoom pcxws1@nottingham.ac.uk

Robert Mokaya r.mokaya@nottingham.ac.uk



Abstract

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, Δw and the time taken to exceed the permissible upper limit of humidity, φi,U in a closed environment. A positive non-linear correlation was determined between the interior volumetric moisture load, ωml and the mass of adsorbent required to fully achieve humidity buffering between specified lower/ upper limits (φi,L and φi,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
Journal Microporous and Mesoporous Materials
Print ISSN 1387-1811
Electronic ISSN 1387-1811
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 211
APA6 Citation Sarce, F., Hall, M. R., Sangchoom, W., & Mokaya, R. (in press). A hygrothermal modelling approach to water vapour sorption isotherm design for mesoporous humidity buffers. Microporous and Mesoporous Materials, 211, https://doi.org/10.1016/j.micromeso.2015.03.001
DOI https://doi.org/10.1016/j.micromeso.2015.03.001
Keywords Hygrothermal modelling
Water vapour isotherm
Isotherm design
Humidity buffering
Publisher URL http://www.sciencedirect.com/science/article/pii/S138718111500147X
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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