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DOI: 10.1055/s-2002-32341
On the Lamellar Structure of the Tracheid Cell Wall
Publikationsverlauf
October 29, 2001
February 28, 2002
Publikationsdatum:
20. Juni 2002 (online)
Abstract
It is clear that cross sections of wood cells show a lamellar structure. This paper investigates the orientation of this lamellar structure of spruce (Picea abies) tracheids using atomic force microscopy (AFM) and scanning electron microscopy (SEM). Cross sections of spruce wood were produced through fracturing in longitudinal bending and tensile testing. When investigated with SEM, the fracture surfaces show a structure of mostly larger radial lamellae, in the order of 30 - 100 nm, i.e., agglomerations of a few cellulose aggregates. Thin transverse sections of the fracture zones investigated with atomic force microscopy show concentric lamellae with a width in the order of a single cellulose aggregate, i.e., 15 - 25 nm. No structural connection to the splinters in the radial direction can be seen. It is suggested that the radial lamellar structure is a consequence of the energy released during fracturing of the wood samples and that the undistorted wood has a concentric lamellar structure on a smaller structural level.
Key words
Atomic force microscopy - ultrastructure - Picea abies - Norway spruce - lamellar structure - scanning electron microscopy - fracture
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L. Salmén
STFI
Swedish Pulp and Paper Research Institute
Box 5604
114 86 Stockholm
Sweden
eMail: lennart.salmen@stfi.se
Section Editor: A. M. C. Emons