Spiral of elementary cellulose fibrils in cell walls of Picea abies determined by small-angle X-ray scattering

被引：59

作者：

Reiterer A. ^{[1
]}

Jakob H.F. ^{[2
]}

Stanzl-Tschegg S.E. ^{[1
]}

Fratzl P. ^{[3
]}

机构：

[1] Inst. für Meteorol. und Physik, Univ. für Bodenkultur Wien, A-1180 Wien

[2] Institut für Materialphysik, Universität Wien, A-1090 Wien

[3] Erich-Schmidinstitut der ÖAW, Univ. Leoben, A-8700 Leoben

来源：

Wood Science and Technology | 1998年 / 32卷 / 5期

关键词：

Fibril; Mechanical Function; Area Detector; Large Specimen; Crystal Axis;

D O I：

10.1007/BF00702790

中图分类号：

学科分类号：

摘要：

The spiral angle of the elementary cellulose fibril in the wood cell wall, often called microfibril angle, is of primary importance for the mechanical properties of wood. While there are a number of methods to estimate this angle, x-ray diffraction (XRD) techniques have recently obtained a lot of attention because of their ability to provide information averaged over a significantly large specimen volume. Here, we present results from a related method, small-angle x-ray scattering (SAXS). The advantage of SAXS is that, unlike XRD, it does not require any assumption on the orientation of the cellulose crystal axis with respect to the fibril axis. Full three-dimensional scattering patterns were collected using an area detector by rotating the sample around one axis. The distribution of fibrillar orientations was seen to reflect the typical cross-sectional shape of the tracheids (square or circular). In the stem, the spiral angle was found <5° in earlywood and ≈20° in latewood. In branches the angle was ≈30° in the upper part and ≈40° in the lower part, which strongly supports the idea that the spiral angle has primarily mechanical function.

引用

页码：335 / 345

页数：10

共 35 条

[21] Lee P.W., Eom Y.G., Anatomical Comparison between Compression Wood and Opposite Wood in a Branch of Korean Pine, IAWA Bulletin, 12, pp. 187-194, (1988)
[22] Meylan B.A., The Influence of Microfibril Angle on the Longitudinal Shrinkage-Moisture Content Relationship, Wood Sci. Technol., 6, pp. 293-301, (1972)
[23] Meylan B.A., Butterfield B.G., Helical Orientation of the Microfibrils in Tracheids, Fibres and Vessels, Wood Sci. Technol., 12, pp. 219-222, (1978)
[24] Paakkari T., Serimaa R., A study of the structure of wood cells by x-ray diffraction, Wood Sci. Technol., 18, pp. 79-85, (1984)
[25] Preston R.D., The fine structure of the wall of the conifer tracheid, Proc. Roy. Soc., B133, pp. 327-348, (1946)
[26] Preston R.D., Phil. Trans. B., 224, (1934)
[27] Prudhomme R.E., Noah J., Determination of Fibril Angle Distribution in Wood Fibers: A Comparison between the X-Ray Diffraction and the Polarized Microscope Method, Wood and Fiber, 6, 4, pp. 282-289, (1975)
[28] Robinson D.G., Ehlers U., Herken R., Herrmann B., Mayer F., Schurmann F.-W., Methods of Preperation for Electron Microscopy, (1987)
[29] Sahlberg U., Salmen L., Oscarsson A., The fibrillar orientation in the S2-layer of wood fibres as determined by x-ray diffraction analysis, Wood Sci. Technol., 31, pp. 77-86, (1997)
[30] Sell J., Zimmermann T., Das Feingefüge von Holz

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