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Measuring the heat of interaction between lignocellulosic materials and water

Nopens, Martin ; Wadsö, Lars LU ; Ortmann, Christian ; Fröba, Michael and Krause, Andreas (2019) In Forests 10(8).
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,... (More)

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).

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author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Heat of sorption, Mixing enthalpy, Sorption, Sorption enthalpy, Water, Wood
in
Forests
volume
10
issue
8
article number
674
publisher
MDPI AG
external identifiers
  • scopus:85070566728
ISSN
1999-4907
DOI
10.3390/f10080674
language
English
LU publication?
yes
id
b3dda2d2-12cb-4822-bdea-e918c88bd98e
date added to LUP
2019-08-23 13:21:58
date last changed
2020-12-29 02:14:34
@article{b3dda2d2-12cb-4822-bdea-e918c88bd98e,
  abstract     = {<p>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).</p>},
  author       = {Nopens, Martin and Wadsö, Lars and Ortmann, Christian and Fröba, Michael and Krause, Andreas},
  issn         = {1999-4907},
  language     = {eng},
  number       = {8},
  publisher    = {MDPI AG},
  series       = {Forests},
  title        = {Measuring the heat of interaction between lignocellulosic materials and water},
  url          = {http://dx.doi.org/10.3390/f10080674},
  doi          = {10.3390/f10080674},
  volume       = {10},
  year         = {2019},
}