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Determination of mesopores in the wood cell wall at dry and wet state
Wood porosity is of great interest for basic research and applications. One aspect is the cell wall porosity at total dry state. When water is absorbed by wood, the uptake of water within the cell wall leads to a dimension change of the material. A hypothesis for possible structures that hold the wa...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7293252/ https://www.ncbi.nlm.nih.gov/pubmed/32533033 http://dx.doi.org/10.1038/s41598-020-65066-1 |
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author | Nopens, Martin Sazama, Uta König, Sandra Kaschuro, Sergej Krause, Andreas Fröba, Michael |
author_facet | Nopens, Martin Sazama, Uta König, Sandra Kaschuro, Sergej Krause, Andreas Fröba, Michael |
author_sort | Nopens, Martin |
collection | PubMed |
description | Wood porosity is of great interest for basic research and applications. One aspect is the cell wall porosity at total dry state. When water is absorbed by wood, the uptake of water within the cell wall leads to a dimension change of the material. A hypothesis for possible structures that hold the water is induced cell wall porosity. Nitrogen and krypton physisorption as well as high pressure hydrogen sorption and thermoporosimetry were applied to softwood and hardwood (pine and beech) in dry and wet state for determining surface area and porosity. Physisorption is not able to detect pores or surface area within the cell wall. Krypton physisorption shows surface area up 5 times lower than nitrogen with higher accuracy. With high pressure sorption no inaccessible pore volumes were seen at higher pressures. Thermoporosimetry was not able to detect mesopores within the hygroscopic water sorption region. Physisorption has to be handled carefully regarding the differences between adsorptives. The absence of water-induced mesopores within the hygroscopic region raise doubts on existing water sorption theories that assume these pore dimensions. When using the term “cell wall porosity”, it is important to distinguish between pores on the cell wall surface and pores that exist because of biological structure, as there are no water-induced mesopores present. The finding offers the possibility to renew wood-water-sorption theories because based on the presented results transport of water in the cell wall must be realized by structures lower than two 2 nm. Nanoporous structures in wood at wet state should be investigated more intensively in future. |
format | Online Article Text |
id | pubmed-7293252 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-72932522020-06-15 Determination of mesopores in the wood cell wall at dry and wet state Nopens, Martin Sazama, Uta König, Sandra Kaschuro, Sergej Krause, Andreas Fröba, Michael Sci Rep Article Wood porosity is of great interest for basic research and applications. One aspect is the cell wall porosity at total dry state. When water is absorbed by wood, the uptake of water within the cell wall leads to a dimension change of the material. A hypothesis for possible structures that hold the water is induced cell wall porosity. Nitrogen and krypton physisorption as well as high pressure hydrogen sorption and thermoporosimetry were applied to softwood and hardwood (pine and beech) in dry and wet state for determining surface area and porosity. Physisorption is not able to detect pores or surface area within the cell wall. Krypton physisorption shows surface area up 5 times lower than nitrogen with higher accuracy. With high pressure sorption no inaccessible pore volumes were seen at higher pressures. Thermoporosimetry was not able to detect mesopores within the hygroscopic water sorption region. Physisorption has to be handled carefully regarding the differences between adsorptives. The absence of water-induced mesopores within the hygroscopic region raise doubts on existing water sorption theories that assume these pore dimensions. When using the term “cell wall porosity”, it is important to distinguish between pores on the cell wall surface and pores that exist because of biological structure, as there are no water-induced mesopores present. The finding offers the possibility to renew wood-water-sorption theories because based on the presented results transport of water in the cell wall must be realized by structures lower than two 2 nm. Nanoporous structures in wood at wet state should be investigated more intensively in future. Nature Publishing Group UK 2020-06-12 /pmc/articles/PMC7293252/ /pubmed/32533033 http://dx.doi.org/10.1038/s41598-020-65066-1 Text en © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Nopens, Martin Sazama, Uta König, Sandra Kaschuro, Sergej Krause, Andreas Fröba, Michael Determination of mesopores in the wood cell wall at dry and wet state |
title | Determination of mesopores in the wood cell wall at dry and wet state |
title_full | Determination of mesopores in the wood cell wall at dry and wet state |
title_fullStr | Determination of mesopores in the wood cell wall at dry and wet state |
title_full_unstemmed | Determination of mesopores in the wood cell wall at dry and wet state |
title_short | Determination of mesopores in the wood cell wall at dry and wet state |
title_sort | determination of mesopores in the wood cell wall at dry and wet state |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7293252/ https://www.ncbi.nlm.nih.gov/pubmed/32533033 http://dx.doi.org/10.1038/s41598-020-65066-1 |
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