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Subcellular Electrical Measurements as a Function of Wood Moisture ContentAuthor(s): Samuel L. Zelinka; José L. Colon Quintana; Samuel V. Glass; Joseph E. Jakes; Alex C. Wiedenhoeft
Source: Proceedings of the 58th International Convention of Society of Wood Science and Technology, June 7-12, 2015 – Grand Teton National Park, Jackson, Wyoming, USA. pp. 568-576.
Publication Series: Full Proceedings
Station: Forest Products Laboratory
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DescriptionThe percolation model developed by Zelinka et al. was based upon macroscale measurements of the electrical conductivity and implicitly treats the wood material as homogenous. The transport mechanism proposed by Jakes et al. depends upon a moisture induced glass transition occurring in the hemicelluloses. This theory suggests that there are likely differences in the threshold moisture content for moisture transport between different regions in the cell wall. For instance, the secondary cell wall contains cellulose microfibrils, amorphous cellulose, hemicelluloses, and lignin, where hemicelluloses are preferentially oriented along the microfibrils (Hafren et al. 2000; earlywood. The resistance decreased with increasing relative humidity in all locations. The resistance decreased more rapidly with relative humidity in the S2 layer than in the middle lamella. These results give insight into how some moisture-dependent wood properties affecting ion movement may be partitioned across cell wall layers.
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CitationZelinka, Samuel L.; Quintana, José L. Colon; Glass, Samuel V.; Jakes, Joseph E.; Wiedenhoeft, Alex C. 2015. Subcellular Electrical Measurements as a Function of Wood Moisture Content. Proceedings of the 58th International Convention of Society of Wood Science and Technology, June 7-12, 2015 – Grand Teton National Park, Jackson, Wyoming, USA. pp. 568-576.
Keywordswood-moisture relations, electrical properties of wood, timber physics, percolation theory, wood damage mechanisms
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