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A percolation model for electrical conduction in wood with implications for wood-water relations

The first models used to describe electrical conduction in cellulosic materials involved conduction pathways through free water. These models were abandoned in the middle of the 20th century. This article re-evaluates the theory of conduction in wood by using a percolation model that describes electrical conduction in terms of overlapping paths of loosely bound or...

Author(s):

Samuel L. Zelinka; Samuel V. Glass; Donald S. Stone

Year:

2008

Keywords:

Ionic conduction, conductivity, percolation theory, wood?water relations, electric conductivity, percolation, wood moisture, moisture, moisture content, percolation model, critical moisture fraction, fiber saturation point

Source:

Wood and fiber science. Vol. 40, no. 4 (Oct. 2008): Pages 544-552.

Threshold for ion movements in wood cell walls below fiber saturation observed by X-ray fluorescence microscopy (XFM)

Diffusion of chemicals and ions through the wood cell wall plays an important role in wood damage mechanisms. In the present work, free diffusion of ions through wood secondary walls and middle lamellae has been investigated as a function of moisture content (MC) and anatomical direction. Various ions (K, Cl, Zn, Cu) were injected into selected regions of 2 ìm thick...

Author(s):

Samuel L. Zelinka; Sophie-Charlotte Gleber; Stefan Vogt; Gabriela M. Rodriguez Lopez; Joseph E. Jakes

Year:

2015

Keywords:

ionic conduction, micro X-ray fluorescence, percolation, wood anatomy, wood-moisture relations

Source:

Holzforschung

Subcellular Electrical Measurements as a Function of Wood Moisture Content

The 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...

Author(s):

Samuel L. Zelinka; José L. Colon Quintana; Samuel V. Glass; Joseph E. Jakes; Alex C. Wiedenhoeft

Year:

2015

Keywords:

wood-moisture relations, electrical properties of wood, timber physics, percolation theory, wood damage mechanisms

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.

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A percolation model for electrical conduction in wood with implications for wood-water relations

Threshold for ion movements in wood cell walls below fiber saturation observed by X-ray fluorescence microscopy (XFM)

Subcellular Electrical Measurements as a Function of Wood Moisture Content

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