Results 171 to 180 of about 2,820 (212)

Variation in microfibril angle in Eucalyptus clones

Holzforschung, 2004
Abstract The microfibril angle of the S2 layer in wood fibres is an ultra-microscopical feature that influences important properties affecting the utilisation of timber. However, this characteristic is as yet little studied, and this is especially true of the genus Eucalyptus.
J. T. Lima, M. C. Breese, C. M. Cahalan
openaire   +1 more source

Microfibril Angle Distribution of Poplar Tension Wood

IAWA Journal, 2012
Tension wood of poplar (Populus nigra) branches was studied by lightand electron microscopy. The characteristic features of tension wood such as wider growth rings, reduced vessel density and higher gross density were confirmed by our results. Based on a novel combination of transmission electron microscopy (TEM) imaging and image analysis, involving ...
Silke Lautner, Cordt Zollfrank, Jörg Fromm   +2 more
openaire   +1 more source

Predicting Microfibril Angle in Eucalyptus Wood from Different Wood Faces and Surface Qualities Using near Infrared Spectra

Journal of Near Infrared Spectroscopy, 2010
The microfibril angle (MFA) of crystalline cellulose in the wood cell wall along the stem axis has major effects on stiffness and longitudinal shrinkage of wood and is of key importance to timber quality.
Paulo Ricardo Gherardi Hein, Bruno Clair, Loïc Brancheriau   +2 more
exaly   +2 more sources

Wood microfibril angle variation after drying

Holzforschung, 2015
Abstract The change of microfibril angle (MFA) in wood cell wall was assessed after drying at 60°C and 70°C to a target moisture content (MC) of 8% or 15%. Despite literature contradictions about the effect of drying on MFA, this study showed that drying increased significantly the MFA, possibly as a result of lateral deformation of ...
Vinicius Lube, Ciprian Lazarescu, Shawn D. Mansfield, Stavros Avramidis   +3 more
openaire   +1 more source

Measurement of microfibril angles in bamboo using Mueller matrix imaging

Applied Optics, 2016
The microfibril angle (MFA) giving the orientation of cellulose chains in hard sclerenchymatous bamboo fibers is one of the most important parameters determining the overall strength of the bamboo culm. In this work, Mueller matrix imaging polarimetry is implemented for determining MFA measured over a transverse section of group of fibers and ...
Sayyad, Mannan, Mohammad, Zaffar, Asima, Pradhan, Sumit, Basu   +3 more
openaire   +2 more sources

Microfibril Angles Inside and Outside Crossfields of Norway Spruce Tracheids

Holzforschung, 2003
Summary The major part of the wood cell wall consists of parallel-aligned cellulose fibrils. Locally, pits connecting adjacent cell walls disturb the fibril arrangement. The local fibril orientation around these mechanically weak points is crucial for the mechanical stability of the cell.
Lichtenegger, H., Müller, M., Wimmer, R., Fratzl, P.   +3 more
openaire   +2 more sources

Microfibril Angle: Measurement, Variation and Relationships – A Review

IAWA Journal, 2008
Microfibril angle (MFA) is perhaps the easiest ultrastructural variable to measure for wood cell walls, and certainly the only such variable that has been measured on a large scale. Because cellulose is crystalline, the MFA of the S2 layer can be measured by X-ray diffraction.
openaire   +1 more source

Inspection of Microfibril Angle of Sugi Wood by THz- TDS

2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), 2018
Wood as a biological material has large differences in individual properties, and terahertz time-domain spectroscopy (THz- TDS) provide a new possibility for the wood products industry since THz exhibits high transparency to wood with big birefringence and diattenuation.
H. Wang, S. Tsuchikawa, T. Inagaki
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Cellulose microfibril angles in a spruce branch and mechanical implications

Journal of Materials Science, 2001
The nanostructure of the wood cell wall and, in particular the tilt angle of the cellulose fibrils versus the longitudinal cell axis (microfibril angle, MFA), are known to play a key role in determining the mechanical properties of wood. A variation of microfibril angles during growth may therefore be regarded as a means to adapt to different loading ...
Farber, J., Lichtenegger, H., Reiterer, A., Stanzl-Tschegg, S., Fratzl, P.   +4 more
openaire   +2 more sources

Determination of microfibril angle distribution by X-ray diffraction

Wood Science and Technology, 2005
X-ray diffraction is a well-established method for the determination of the mean microfibril angle (MFA). When the sample is a slice of wood variations in the fibre orientation, the shape of the cells, and the measurement geometry affect the intensity curve.
Matti-P. Sarén, Ritva Serimaa
openaire   +1 more source