Dimensional stabilization of wood by microporous silica aerogel using in-situ polymerization

In this paper, a method for dimensional stabilization of wood through bulk hydrophobization was investigated using a sol–gel process resulting in in-situ formation of microporous SiO 2 aerogel. Two different wood species, beech ( Fagus sylvatica ) and Scots pine ( Pinus sylvestris ) were investigate...

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Bibliographic Details
Published in:Wood science and technology 2022-09, Vol.56 (5), p.1353-1375
Main Authors: Bak, Miklós, Molnár, Ferenc, Rákosa, Rita, Németh, Zsolt, Németh, Róbert
Format: Article
Language:English
Subjects:
Beech
Biomedical and Life Sciences
Cell walls
Cellulose
Ceramics
Composites
Contact angle
Dimensional stability
Efficiency
Fourier transforms
Glass
Hydrophobic surfaces
Hygroscopicity
In situ leaching
Infrared spectroscopy
Laboratories
Leaching
Life Sciences
Machines
Manufacturing
Mechanical properties
Moisture content
Moisture effects
Nanoparticles
Natural Materials
Original
Permeability
Pine trees
Pinus sylvestris
Polymerization
Porous materials
Processes
Scanning electron microscopy
Scientific imaging
Silica
Silica aerogels
Silicon
Silicon dioxide
Sol-gel processes
Spectrometry
Water content
Water uptake
Wood
Wood Science & Technology
Wood sciences
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Summary:In this paper, a method for dimensional stabilization of wood through bulk hydrophobization was investigated using a sol–gel process resulting in in-situ formation of microporous SiO 2 aerogel. Two different wood species, beech ( Fagus sylvatica ) and Scots pine ( Pinus sylvestris ) were investigated. The incorporation of microporous silica aerogel inside the cell wall and lumen was verified by scanning electron microscopy, energy dispersive spectrometry and Fourier-transform infrared spectroscopy. A leaching test using paper as model material proved the bonding of the aerogel to the cellulose component of the cell wall, which indicates a long-lasting effect of the treatment. The modification of wood with silica aerogel significantly improved its hygroscopicity and dimensional stability, decreased the equilibrium moisture content and water uptake beside a low weight percent gain. Permeability was reduced as a result of the silica aerogel deposition in the macro- and micropores of the modified wood. The treatment resulted in an obvious colour change as well.
ISSN:0043-7719
1432-5225
DOI:10.1007/s00226-022-01412-y