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

Source: Holzforschung

Author(s)Zelinka, Samuel L.; Gleber, Sophie-Charlotte; Vogt, Stefan; Rodriguez Lopez, Gabriela M.; Jakes, Joseph E.

Publication Year: 2015  View PDF »

Category: Journal Articles
Associated Research Project(s):   FPL-4707-2B  FPL-4716-3A

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 ìm 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.

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

Publication Review Process: Formally Refereed

File size: 5,951 kb(s)

Date posted: 05/27/2015

This publication is also viewable on Treesearch:  view
RITS Product ID: 72891
Current FPL Scientists associated with this product (listed alphabetically)
Jakes, Joseph
Research Materials Engineer
Zelinka, Samuel L.
Materials Research Engineer
 

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