Evolution of wood cell wall nanopore size distribution in the hygroscopic range
-
Jingbo Shi
and
Stavros Avramidis
Abstract
Owing to technical difficulties, experimental assessment of wood cell wall pore size distribution (PSD) in the hygroscopic range still remains challenging. Here, a “trial-and-error” approach was proposed to calculate such distribution through bridging experimental and simulated sorption isotherms presented by the authors in the past. Two main assumptions were made in the calculations, namely, the generation of new and the swelling of existing cell wall pores during water sorption. The nanopore size distribution of dried cell wall derived from the experimental CO2 gas sorption isotherms was used as the initial boundary condition. Predicted pore size distributions were assessed to be fairly reasonable by comparing them at 95% relative humidity with the PSD of fully saturated cell walls derived from the solute exclusion method. The predicted distribution was relatively wide with several major peaks evolving in the hygroscopic range. The present work also showed that confounded by a wide PSD that includes mostly micropores, the shape of the experimental sorption isotherms was not reliable in assessing the sorption mechanism. The simulations suggested an alternative water sorption mechanism for wood, i.e. micropore filling of cell wall nanopores.
Acknowledgments
The discussion with Prof. Jiabin Cai from Nanjing Forestry University on cell wall pores is greatly appreciated.
Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: This work was funded by the Natural Sciences and Engineering Research Council, Funder Id: http://dx.doi.org/10.13039/501100000038 (NSERC) of Canada Discovery grant RGPIN-2016-04325.
Employment or leadership: None declared.
Honorarium: None declared.
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Supplementary Material
The online version of this article offers supplementary material (https://doi.org/10.1515/hf-2018-0198).
©2019 Walter de Gruyter GmbH, Berlin/Boston
Articles in the same Issue
- Frontmatter
- Original Articles
- Sleeping beauties in materials science: unlocking the value of xylarium specimens in the search for timbers of the future
- Evolution of wood cell wall nanopore size distribution in the hygroscopic range
- Differences between hygroscopicity limit and cell wall saturation investigated by LF-NMR on Southern pine (Pinus spp.)
- Influence of the p-hydroxyphenyl/guaiacyl ratio on the biphenyl and β-5 contents in compression wood lignins
- Acid precipitation of kraft lignin from aqueous solutions: the influence of anionic specificity and concentration level of the salt
- Solutes in sap obtained from supercritical CO2 dewatering of radiata pine sapwood, and a new role of sap cyclitols in brown stain formation during kiln drying of green wood
- Variation of surface and bonding properties among four wood species induced by a high voltage electrostatic field (HVEF)
- Effect of different coupling agents on the thermal, mechanical and biological behavior of vinyl acetate-wood polymer composite
Articles in the same Issue
- Frontmatter
- Original Articles
- Sleeping beauties in materials science: unlocking the value of xylarium specimens in the search for timbers of the future
- Evolution of wood cell wall nanopore size distribution in the hygroscopic range
- Differences between hygroscopicity limit and cell wall saturation investigated by LF-NMR on Southern pine (Pinus spp.)
- Influence of the p-hydroxyphenyl/guaiacyl ratio on the biphenyl and β-5 contents in compression wood lignins
- Acid precipitation of kraft lignin from aqueous solutions: the influence of anionic specificity and concentration level of the salt
- Solutes in sap obtained from supercritical CO2 dewatering of radiata pine sapwood, and a new role of sap cyclitols in brown stain formation during kiln drying of green wood
- Variation of surface and bonding properties among four wood species induced by a high voltage electrostatic field (HVEF)
- Effect of different coupling agents on the thermal, mechanical and biological behavior of vinyl acetate-wood polymer composite
