Pore space analysis of beech wood: The vessel network

Haß, Philipp; Wittel, Falk K.; McDonald, S. A.; Marone, Federica; Stampanoni, Marco; Herrmann, Hans J.; Niemz, Peter

doi:10.1515/hf.2010.103

Cited by 47 publications

(48 citation statements)

References 18 publications

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“…A few examples may illustrate this: XCT was applied to study wood species (Trtik et al 2007; Van den Bulcke et al 2009;Svedström et al 2012), wood coatings (Van den Bessières et al 2013), structural changes during drying and modification (Leppänen et al 2011;Van den Bulcke et al 2011;Taylor et al 2013;Biziks et al 2016), archeological wood (Svedström et al 2011), cork (Oliveira et al 2016), fiberboards (Badel et al 2008, Walter andThoemen 2009), wood plastic composites (Defoirdt et al 2010;Schwarzkopf and Muszynski 2015), plywood (Van den Bulcke et al 2011), wood strand composites (Li et al 2016), and wax-impregnation (Scholz et al 2010a,b), just to mention a few. In general, the emerging synchrotron based TM with its high resolution has a great analytical power for wood research (Trtik et al 2007;Hass et al 2010;Zauner et al 2012;Endo and Sugiyama 2013;Baensch et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Microstructure of chemically modified wood using X-ray computed tomography in relation to wetting properties

et al. 2016

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X-ray computed tomography (XCT) was utilized to visualize and quantify the 2D and 3D microstructure of acetylated southern yellow pine (pine) and maple, as well as furfurylated pine samples. The total porosity and the porosity of different cell types, as well as cell wall thickness and maximum opening of tracheid lumens were evaluated. The wetting properties (swelling and capillary uptake) were related to these microstructural characteristics. The data show significant changes in the wood structure for furfurylated pine sapwood samples, including a change in tracheid shape and filling of tracheids by furan polymer. In contrast, no such changes were noted for the acetylated pine samples at the high resolution of 0.8 μm. The XCT images obtained for the furfurylated maple samples demonstrated that all ray cells and some vessel elements were filled with furan polymer while the fibers largely remained unchanged. Furfurylation significantly decreased the total porosity of both the maple and pine samples. Furthermore, this was observed in both earlywood (EW) and latewood (LW) regions in the pine samples. In contrast, the total porosity of pine samples was hardly affected by acetylation. These findings are in line with wetting results demonstrating that furfurylation reduces both swelling and capillary uptake in contrast to acetylation which reduces mostly swelling. Furfurylation significantly increased the cell wall thickness of both the maple and pine samples, especially at higher levels of furfurylation.

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Section: Introductionmentioning

confidence: 99%

Microstructure of chemically modified wood using X-ray computed tomography in relation to wetting properties

et al. 2016

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“…The associated data processing allows acquisition of spatial information even of subcellular structures with a resolution of 0.35 μ m Stampanoni et al 2006a,b ) and observations of different anatomical elements. Both methods provided useful data from in situ mechanical experiments with wood (Trtik et al 2007 ;Walther and Thoemen 2009 ;Hass et al 2010 ;Mannes et al 2010 ), either by means of manual or automatic testing devices (Badel et al 2008 ;Forsberg et al 2008 ). Suitable testing devices seem to be a bottleneck in this type of experiments.…”

Section: Introductionmentioning

confidence: 99%

Synchrotron-based tomographic microscopy (SbTM) of wood: development of a testing device and observation of plastic deformation of uniaxially compressed Norway spruce samples

et al. 2012

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To understand better the structure-property relationships of wood in situ, nondestructive synchrotron-based tomographic microscopy (SbTM) with subcellular resolution is useful. In this context, an in situ testing device was developed to determine the cellular response of wood to mechanical loading. Different rotationally symmetric specimens were tested to synchronize the failure areas to the given scanning areas. Norway spruce samples were uniaxially compressed in the longitudinal direction and scanned in situ at several increasing relative forces ending up in the plastic deformation regime. A suffi ciently high quality in situ tomography was demonstrated. The reconstructed data allowed the observation of the load-dependent development of failure regions: cracks and buckling on the microstructure were clearly visible. Future investigations with SbTM on different wood species, loading directions, and different moisture contents are promising in terms of the micromechanical behavior of wood.

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“…vessels, which were much deeper than the roughness caused by the planing. Anatomical studies of beech have found average vessel diameters of 55.3 µm (Hass et al 2010) and 56.4 µm (by calculation from data presented) (Sass and Eckstein 1995). The deep valleys shown in Figs.…”

Section: Surface Quality-roughness Parametersmentioning

confidence: 91%

Surface Quality of Planed Beech Wood (Fagus sylvatica L.) Thermally Treated for Different Durations of Time

et al. 2017

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Thermally treating wood improves its dimensional stability and durability. The chemical changes brought about by a heat treatment also affect the mechanical properties of wood. Consequently, a heat treatment also influences how a wood surface responds to machining. This study examined the impact of heat treatments at 200 C between 1 h and 6 h on the subsequent surface quality of planed beech wood (Fagus sylvatica L.). The new approach was that surface quality was assessed by following a tested method from previous research regarding the measuring and evaluation recommendations meant to reduce the biasing effect of wood anatomy, Also, a large number of roughness parameters were used for interpretation of the combined effect of processing and wood anatomy after filtering the data with a robust filter. Among those, Rk is the parameter that is least biased by wood anatomy and that best expresses the effect of processing alone. Electron micrographs were taken to visually assess the resultant surfaces. The results showed a gradual increase in processing roughness, as distinctively measured by Rk, which increased with longer durations of the treatment. Vessel cavities were deeper than those caused by processing and that influenced, among other parameters, Ra, which is most commonly used in literature to assess surface quality. The ray tissue, especially, exhibited both greater pull-out of fibers and a sort of plasticization with increased treatment time. The length of the thermal treatment reduced surface waviness. The results also showed that it was necessary to calculate the roughness parameters to differentiate between two similar surfaces rather than relying on visual and tactile assessments alone.

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Pore space analysis of beech wood: The vessel network

Cited by 47 publications

References 18 publications

Microstructure of chemically modified wood using X-ray computed tomography in relation to wetting properties

Microstructure of chemically modified wood using X-ray computed tomography in relation to wetting properties

Synchrotron-based tomographic microscopy (SbTM) of wood: development of a testing device and observation of plastic deformation of uniaxially compressed Norway spruce samples

Surface Quality of Planed Beech Wood (Fagus sylvatica L.) Thermally Treated for Different Durations of Time

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