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Raman micro-spectroscopy of two types of acetylated Norway spruce wood at controlled relative humidity

Ponzecchi, Andrea ; Thybring, Emil E. ; Digaitis, Ramūnas LU ; Fredriksson, Maria LU orcid ; Solsona, Sara Piqueras and Thygesen, Lisbeth Garbrecht (2022) In Frontiers in Plant Science 13.
Abstract

Water is a key element for wood performance, as water molecules interact with the wood structure and affect important material characteristics such as mechanical properties and durability. Understanding wood-water interactions is consequently essential for all applications of wood, including the design of wood materials with improved durability by chemical modification. In this work, we used Raman micro-spectroscopy in combination with a specially designed moisture chamber to map molecular groups in wood cell walls under controlled moisture conditions in the hygroscopic range. We analyzed both untreated and chemically modified (acetylated to achieve two different spatial distributions of acetyl groups within the cell wall) Norway spruce... (More)

Water is a key element for wood performance, as water molecules interact with the wood structure and affect important material characteristics such as mechanical properties and durability. Understanding wood-water interactions is consequently essential for all applications of wood, including the design of wood materials with improved durability by chemical modification. In this work, we used Raman micro-spectroscopy in combination with a specially designed moisture chamber to map molecular groups in wood cell walls under controlled moisture conditions in the hygroscopic range. We analyzed both untreated and chemically modified (acetylated to achieve two different spatial distributions of acetyl groups within the cell wall) Norway spruce wood. By moisture conditioning the specimens successively to 5, 50, and 95% relative humidity using deuterium oxide (D2O), we localized the moisture in the cell walls as well as distinguished between hydroxyl groups accessible and inaccessible to water. The combination of Raman micro-spectroscopy with a moisturizing system with deuterium oxide allowed unprecedented mapping of wood-water interactions. The results confirm lower moisture uptake in acetylated samples, and furthermore showed that the location of moisture within the cell wall of acetylated wood is linked to the regions where acetylation is less pronounced. The study demonstrates the local effect that targeted acetylation has on moisture uptake in wood cell walls, and introduces a novel experimental set-up for simultaneously exploring sub-micron level wood chemistry and moisture in wood under hygroscopic conditions.

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author
; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
acetylation, biological imaging, chemical modification, moisture, Raman micro-spectroscopy, relative humidity, water, wood
in
Frontiers in Plant Science
volume
13
article number
986578
publisher
Frontiers Media S. A.
external identifiers
  • pmid:36147227
  • scopus:85138407650
ISSN
1664-462X
DOI
10.3389/fpls.2022.986578
project
Fundamental understanding of the moisture uptake in modified wood for sustainable, durable wood structures
language
English
LU publication?
yes
additional info
Funding Information: LT thank Aase og Ejnar Danielsens Fond for funding part of the research work. RD would like to acknowledge the Royal Swedish Agricultural Academy for funding which led to the development of the moisture chamber used in this study grant no. GFS2019-0079. MF thank the Swedish Research Council FORMAS grant no. 2018-00387. Publisher Copyright: Copyright © 2022 Ponzecchi, Thybring, Digaitis, Fredriksson, Solsona and Thygesen.
id
b3b4f116-d883-4752-9af9-33bc52eb14e1
date added to LUP
2022-10-19 08:28:28
date last changed
2024-04-04 08:45:15
@article{b3b4f116-d883-4752-9af9-33bc52eb14e1,
  abstract     = {{<p>Water is a key element for wood performance, as water molecules interact with the wood structure and affect important material characteristics such as mechanical properties and durability. Understanding wood-water interactions is consequently essential for all applications of wood, including the design of wood materials with improved durability by chemical modification. In this work, we used Raman micro-spectroscopy in combination with a specially designed moisture chamber to map molecular groups in wood cell walls under controlled moisture conditions in the hygroscopic range. We analyzed both untreated and chemically modified (acetylated to achieve two different spatial distributions of acetyl groups within the cell wall) Norway spruce wood. By moisture conditioning the specimens successively to 5, 50, and 95% relative humidity using deuterium oxide (D<sub>2</sub>O), we localized the moisture in the cell walls as well as distinguished between hydroxyl groups accessible and inaccessible to water. The combination of Raman micro-spectroscopy with a moisturizing system with deuterium oxide allowed unprecedented mapping of wood-water interactions. The results confirm lower moisture uptake in acetylated samples, and furthermore showed that the location of moisture within the cell wall of acetylated wood is linked to the regions where acetylation is less pronounced. The study demonstrates the local effect that targeted acetylation has on moisture uptake in wood cell walls, and introduces a novel experimental set-up for simultaneously exploring sub-micron level wood chemistry and moisture in wood under hygroscopic conditions.</p>}},
  author       = {{Ponzecchi, Andrea and Thybring, Emil E. and Digaitis, Ramūnas and Fredriksson, Maria and Solsona, Sara Piqueras and Thygesen, Lisbeth Garbrecht}},
  issn         = {{1664-462X}},
  keywords     = {{acetylation; biological imaging; chemical modification; moisture; Raman micro-spectroscopy; relative humidity; water; wood}},
  language     = {{eng}},
  month        = {{09}},
  publisher    = {{Frontiers Media S. A.}},
  series       = {{Frontiers in Plant Science}},
  title        = {{Raman micro-spectroscopy of two types of acetylated Norway spruce wood at controlled relative humidity}},
  url          = {{http://dx.doi.org/10.3389/fpls.2022.986578}},
  doi          = {{10.3389/fpls.2022.986578}},
  volume       = {{13}},
  year         = {{2022}},
}