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

Abstract

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 mu m thick wood sections with a microinjector and then the ion distribution was mapped by means of X-ray fluorescence microscopy with submicron spatial resolution. The MC of the wood was controlled in situ by means of climatic chamber with controlled relative humidity (RH). For all ions investigated, there was a threshold RH below which the concentration profiles did not change. The threshold RH depended upon ionic species, cell wall layer, and wood anatomical orientation. Above the threshold RH, differences in mobility among ions were observed and the mobility depended upon anatomical direction and cell wall layer. These observations support a recently proposed percolation model of electrical conduction in wood. The results contribute to understanding the mechanisms of fungal decay and fastener corrosion that occur below the fiber saturation point.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
U.S. Department of Agriculture (USDA) - Agricultural Research Service; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1247717
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Holzforschung
Additional Journal Information:
Journal Volume: 69; Journal Issue: 4; Journal ID: ISSN 0018-3830
Country of Publication:
United States
Language:
English
Subject:
ionic conduction; micro X-ray fluorescence; percolation; wood anatomy; wood-moisture relations

Citation Formats

Zelinka, Samuel L., Gleber, Sophie-Charlotte, Vogt, Stefan, Rodriguez Lopez, Gabriela M., and Jakes, Joseph E. Threshold for ion movements in wood cell walls below fiber saturation observed by X-ray fluorescence microscopy (XFM). United States: N. p., 2015. Web. doi:10.1515/hf-2014-0138.
Zelinka, Samuel L., Gleber, Sophie-Charlotte, Vogt, Stefan, Rodriguez Lopez, Gabriela M., & Jakes, Joseph E. Threshold for ion movements in wood cell walls below fiber saturation observed by X-ray fluorescence microscopy (XFM). United States. doi:10.1515/hf-2014-0138.
Zelinka, Samuel L., Gleber, Sophie-Charlotte, Vogt, Stefan, Rodriguez Lopez, Gabriela M., and Jakes, Joseph E. Fri . "Threshold for ion movements in wood cell walls below fiber saturation observed by X-ray fluorescence microscopy (XFM)". United States. doi:10.1515/hf-2014-0138.
@article{osti_1247717,
title = {Threshold for ion movements in wood cell walls below fiber saturation observed by X-ray fluorescence microscopy (XFM)},
author = {Zelinka, Samuel L. and Gleber, Sophie-Charlotte and Vogt, Stefan and Rodriguez Lopez, Gabriela M. and Jakes, Joseph E.},
abstractNote = {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 mu m thick wood sections with a microinjector and then the ion distribution was mapped by means of X-ray fluorescence microscopy with submicron spatial resolution. The MC of the wood was controlled in situ by means of climatic chamber with controlled relative humidity (RH). For all ions investigated, there was a threshold RH below which the concentration profiles did not change. The threshold RH depended upon ionic species, cell wall layer, and wood anatomical orientation. Above the threshold RH, differences in mobility among ions were observed and the mobility depended upon anatomical direction and cell wall layer. These observations support a recently proposed percolation model of electrical conduction in wood. The results contribute to understanding the mechanisms of fungal decay and fastener corrosion that occur below the fiber saturation point.},
doi = {10.1515/hf-2014-0138},
journal = {Holzforschung},
issn = {0018-3830},
number = 4,
volume = 69,
place = {United States},
year = {2015},
month = {5}
}