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Open AccessArticle

Measuring the Heat of Interaction between Lignocellulosic Materials and Water

1
Department of Wood Science and Technology, University Hamburg, 21031 Hamburg, Germany
2
Building Materials, Lund University, 223 63 Lund, Sweden
3
TA Instruments, 65760 Eschborn, Germany
4
Institute of Inorganic and Applied Chemistry, University Hamburg, 20146 Hamburg, Germany
*
Author to whom correspondence should be addressed.
Forests 2019, 10(8), 674; https://doi.org/10.3390/f10080674
Received: 15 July 2019 / Revised: 2 August 2019 / Accepted: 6 August 2019 / Published: 9 August 2019
(This article belongs to the Special Issue Wood-Moisture Relations)
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Abstract

Research Highlights: When investigating the sorption of water on lignocellulosic materials, the sorption or mixing enthalpy is an interesting parameter that, together with the sorption isotherms commonly measured, can be used to characterize and understand the sorption process. We have compared different methods to assess these enthalpies. Additionally, we propose a sorption nomenclature. Background and Objectives: Sorption enthalpies are non-trivial to measure. We have, for the first time, measured sorption enthalpies on the same materials with four different methods, to be able to compare the method’s strengths and weaknesses. Materials and Methods: The following four methods were used on beech and Scots pine wood: isosteric heat, solution calorimetry, sorption calorimetry, and RH perfusion calorimetry. Results: The results for beech and pine were similar, and were in general agreement with the literature. We do not recommend one of the methods over the others, as they are quite different, and they can therefore be used to elucidate different aspects of the interactions between water and, for example, novel biobased materials (modified woods, cellulose derivatives, and regenerated cellulose). View Full-Text
Keywords: wood; water; sorption; sorption enthalpy; mixing enthalpy; heat of sorption wood; water; sorption; sorption enthalpy; mixing enthalpy; heat of sorption
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Nopens, M.; Wadsö, L.; Ortmann, C.; Fröba, M.; Krause, A. Measuring the Heat of Interaction between Lignocellulosic Materials and Water. Forests 2019, 10, 674.

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