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Using a poly-chromatic X-ray beam by moisture content and microfibril angle determination: theoretical and experimental approaches.

Ricardo Baettig
Abstract : Moisture content and microfibril angle measure is an important stake for the sciences of the wood because these two parameters influence strongly the macroscopic behavior of the wood. For example, the shrinkage, the mechanical properties, the thermal and acoustic conductivity are dependent on the moisture content and their anisotropic character is largely governed by the microfibril angle. We used the light difference between the X-ray coefficient of attenuation for the water and for the wood in transmission. Unfortunately, the results show that this difference between the coefficients of attenuation is insufficient to allow the precise measure of the moisture content. In spite of this, the coherent scattering shows sensitive effects. So, by using a poly-chromatic beam and a spectrometric system, we were able to discriminate between the crystalline constituent (cellulose of the wood) of the amorphous constituent (water) in a sample of the wet wood, because for a given angle these phases scatter in different energies. Besides, the device created allowed us to study the crystalline phase of the wood. We were able to confront experimental profiles of diffraction with theoretical profiles of diffraction obtained by means of a rigorous simulation, in the objective to estimate the average microfibril angle and its standard deviation.
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Contributor : Ecole Agroparistech <>
Submitted on : Wednesday, February 22, 2006 - 8:00:00 AM
Last modification on : Wednesday, February 22, 2006 - 8:00:00 AM
Long-term archiving on: : Friday, October 19, 2012 - 11:55:33 AM

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Ricardo Baettig. Using a poly-chromatic X-ray beam by moisture content and microfibril angle determination: theoretical and experimental approaches.. Life Sciences [q-bio]. ENGREF (AgroParisTech), 2005. English. ⟨pastel-00001424⟩

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