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Application of spatial distribution of cellulose crystallites for determining wood anisotropy
Polish Academy of Sciences.
Poznań University of Life Sciences.
Polish Academy of Sciences.
Linnaeus University, Faculty of Science and Engineering, School of Engineering. (Skog och trä)ORCID iD: 0000-0002-8824-5090
2012 (English)In: Workshop micro-characterisation of wood materials and properties: 24–26 October, 2012 Edinburgh, Scotland, UK, 2012, 29-30 p.Conference paper, (Refereed)
Abstract [en]

The anisotropy of wood properties is related to the ultrastructural organization of wood cell walls. The mean microfibril angle (MFA) is the most obvious parameter quantifying the ultrastructure. Various methods for the MFA measurements have been developed. However, the direct microscopic techniques (both light and electron ones) as well as the indirect X-ray methods were dominating. However, the helical arrangement of cellulose fibrils in wood cells around the longitudinal anatomical direction results in spatial changes of orientations of the lattice planes. Such misorientation between the longitudinal anatomical direction and the microfibril axes has a spatial character and therefore, it can not be correctly described by a single parameter only, i.e. by MFA. The most comprehensive description of the spatial distribution of orientations of cellulose crystallites can be obtained when defining a set of parameters consisting of the rotating axis (given by the polar coordinates θ and ψ and referred to the sample framework) as well as the angle of rotation (ω) around the axis. In order to analyze of wood anisotropy a stereographic projection of the rotating axes on the base of the (010) plane of the lattice cell of cellulose is recommended. Regarding the crystallographic system of the monoclinic lattice of cellulose and the two-fold symmetry of the <010> axis, the projection plane corresponded to the a-c plane of the elementary cell [3]. An example of the projection and the distribution of the rotation axis characterizing the spatial organization of wood microfibrils is given in Fig. 1. The θ, ψ and ω parameters were determined with the original computer program SpaceWood. The parameters were determined regarding the crystallographic symmetry and the parameters of the unit-cell of cellulose given by Zugenmaier [3].

Place, publisher, year, edition, pages
2012. 29-30 p.
Keyword [en]
crystallographic texture, X-ray diffraction, microfibril angle, Scots pine wood
National Category
Materials Engineering
Research subject
Technology (byts ev till Engineering), Forestry and Wood Technology
Identifiers
URN: urn:nbn:se:lnu:diva-22255OAI: oai:DiVA.org:lnu-22255DiVA: diva2:564156
Conference
Experimental and Computational Micro-Characterization Techniques in Wood Mechanics –COST Action FP0802, Edinburgh, Scotland, UK, October 24-26, 2012
Available from: 2012-11-01 Created: 2012-11-01 Last updated: 2016-05-03Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
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