Abstract
Pine sapwood was treated with various types of silica sols. Whereas alkaline sols were not able to penetrate deeper into wood, neutral and acidic sols showed good penetration. The weight percent gain of treated specimens amounted to 20–25%; bulking was negligible or even slightly negative. All silica sols in the treated specimens were stable against water leaching. A water submersion test revealed hydrophobation of the wood only after treatment with a cationic silica sol; all other silica sols increased the rate of water uptake. The addition of 2% cationic sol to a malt-agar growth medium caused growth inhibition of 40–50% of the wood decay fungi Coniophora puteana and Trametes versicolor, whereas the other silica sols did not inhibit growth. Pine sapwood and beech wood blocks treated with the cationic sol showed a strong reduction in mass loss compared to the control samples after incubation with C. puteana (pine) and T. versicolor (beech) according to EN 113 and CEN/TS 15083-1; all other silica sols did not inhibit fungal decay. The cationic silica sol reduced blue staining by Aureobasidium pullulans compared to the untreated control but did not fully prevent it; all other silica sols did not inhibit blue staining.
The authors would like to acknowledge the contribution of Akzo Nobel for supplying the chemicals and technical information. They thank Mr. Nicolas Schulze and Mr. Michael Stark for their excellent work as project students.
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Articles in the same Issue
- Masthead
 - Masthead
 - Review
 - Novel cellulose-based composites based on nanofibrillated plant and bacterial cellulose: recent advances at the University of Aveiro – a review
 - Original Articles
 - Quantitative structural characterization of the lignins from the stem and pith of bamboo (Phyllostachys pubescens)
 - Fractionation and characterization of lignin-carbohydrate complexes (LCCs) of Eucalyptus globulus in residues left after MWL isolation. Part II: Analyses of xylan-lignin fraction (X-L)
 - Alkali consumption of aliphatic carboxylic acids during alkaline pulping of wood and nonwood feedstocks
 - Improvement of kraft pulp bleaching by treatments with laccase, urea, and refining
 - Development and evaluation of new curing agents derived from glycerol for formaldehyde-free soy-based adhesives in wood composites
 - Formation of highly hydrophobic wood surfaces using silica nanoparticles modified with long-chain alkylsilane
 - The fracture behavior of birch and spruce in the radial-tangential crack propagation direction at the scale of the growth ring
 - Flatwise Young’s modulus and flatwise shear modulus of plywood measured by flexural vibration test
 - A numerical and experimental study regarding the influence of some process parameters on the damage state in wood chips
 - Treatment of wood with silica sols against attack by wood-decaying fungi and blue stain
 - Mimicking of the strength loss in the Vasa: model experiments with iron-impregnated recent oak
 - Improved heat insulation system (Mirrorpanel) for construction of wood buildings
 - Meetings
 - Meetings
 
Articles in the same Issue
- Masthead
 - Masthead
 - Review
 - Novel cellulose-based composites based on nanofibrillated plant and bacterial cellulose: recent advances at the University of Aveiro – a review
 - Original Articles
 - Quantitative structural characterization of the lignins from the stem and pith of bamboo (Phyllostachys pubescens)
 - Fractionation and characterization of lignin-carbohydrate complexes (LCCs) of Eucalyptus globulus in residues left after MWL isolation. Part II: Analyses of xylan-lignin fraction (X-L)
 - Alkali consumption of aliphatic carboxylic acids during alkaline pulping of wood and nonwood feedstocks
 - Improvement of kraft pulp bleaching by treatments with laccase, urea, and refining
 - Development and evaluation of new curing agents derived from glycerol for formaldehyde-free soy-based adhesives in wood composites
 - Formation of highly hydrophobic wood surfaces using silica nanoparticles modified with long-chain alkylsilane
 - The fracture behavior of birch and spruce in the radial-tangential crack propagation direction at the scale of the growth ring
 - Flatwise Young’s modulus and flatwise shear modulus of plywood measured by flexural vibration test
 - A numerical and experimental study regarding the influence of some process parameters on the damage state in wood chips
 - Treatment of wood with silica sols against attack by wood-decaying fungi and blue stain
 - Mimicking of the strength loss in the Vasa: model experiments with iron-impregnated recent oak
 - Improved heat insulation system (Mirrorpanel) for construction of wood buildings
 - Meetings
 - Meetings