Segla, Kossi Novinyo Adjonou, Kossi Rabiou, Habou André Bationo, Babou Mahamane, Ali Guibal, Daniel Kokou, Kouami Chaix, Gilles Kokutse, Adzo Dzifa Langbour, Patrick
...
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Holzforschung
Pterocarpus erinaceus (Poir) is currently the most exploited and threatened spontaneous tree species in the Guinean-Sudanian and Sudano-Sahelian zones in West Africa. This work analyzed the density and color parameters of P. erinaceus wood in the phytogeographic zones (Sudanian, Guinean and Sahelian) in three countries in West Africa (Togo, Burkina...
Bédounguindzi, Walter Fiacre Candelier, Kévin Edou Engonga, Prosper Dumarçay, Stéphane Thévenon, Marie-France Gérardin, Philippe
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Holzforschung
Dacryodes edulis (G. Don) H.J. Lam resin was hydro-distilled to recover essential oil (EO), and further purified to produce a heavy fraction constituting less volatile compounds. Chemical composition was investigated by gas chromatography-mass spectrometry (GC-MS), and indicated that different monoterpenes and triterpenes were present depending on ...
Shi, Jingbo Kawai, Yasuo Avramidis, Stavros Cai, Jiabin Dong, Huijun
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Holzforschung
Whether water sorption hysteresis exists above 75 °C and the representation of its relationship with wood softening remains unclear. In this study, sorption hysteresis at three temperature levels, namely, 75, 90 and 99.5 °C, was investigated using accurately controlled conditioning chambers using powder samples from seven wood species. The dry mass...
Ehrhardt, Christopher Tapken, Marco Namyslo, Jan C. Kaufmann, Dieter E.
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Holzforschung
The broad applicability of the wood modification protocol recently published by Kaufmann et al. allows to improve the fire resistance of renewable materials, too. In this study organophosphorus and organoboron compounds have been synthesized, characterized and subsequently applied for enhanced flame retardancy of wood. Wood hydroxyl groups of Scots...
Vaziri, Mojgan Karlsson, Olov Abrahamsson, Lars Lin, Chia-Feng Sandberg, Dick
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Holzforschung
This study presents a novel application of the Wilhelmy plate method on welded joints of Scots pine sapwood and beech. Welding resulted in an increase in the contact angle (increased hydrophobicity) as well as a decrease in the water uptake and swelling of the welded pine-joint compared to non-welded pine. When the welding time was extended from 4 ...
Humar, Miha Balzano, Angela Grbec, Samo Gričar, Jožica Kržišnik, Davor Lesar, Boštjan Vek, Viljem
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Holzforschung
Forests are under great pressure due to climate changes. It is forecast that the importance of Mediterranean type forests will significantly increase. Among various types of oak species, pubescent oak (Quercus pubescens) will likely gain ecological and economic importance in the region south of Alps. Although this wood species is well known, there ...
Ben’ko, Elena M. Chukhchin, Dmitriy G. Lunin, Valeriy V.
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Holzforschung
Treatment of plant biomass with ozone is a promising delignification method. It was shown that lignin removal from the cell wall during ozonation was limited by topochemical reactions and toke place in the secondary rather in the primary cell wall. The separation of cellulose microfibrils, the loss of cell wall stiffness and complete removal of int...
Vaziri, Mojgan Karlsson, Olov Abrahamsson, Lars Moghaddam, Maziar Sedighi Sandberg, Dick
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Holzforschung
The effect of wollastonite on the wetting properties of welded Scots pine-joints was studied using the multicycle Wilhelmy plate method and by observation of the chemical composition of the welded joints. Welding pine with wollastonite for 5 s resulted in a decrease in the water uptake and the swelling, and an increase in the contact angle of the w...
Higaki, Ayano Kadowaki, Yui Yoshinaga, Arata Takabe, Keiji
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Holzforschung
Xylan deposition and lignification processes were examined in tension wood fibers with gelatinous layers (G-layers) in Mallotus japonicus (Euphorbiaceae). The cell walls consisted of a multi-layered structure of S1 + S2 + G + n(L + G), where n indicates the number of repetitions (n = 0–3) and L indicates very thin lignified layers. The formation an...
Lagaňa, Rastislav Csiha, Csilla Horváth, Norbert Tolvaj, László Andor, Tomáš Kúdela, Jozef Németh, Róbert Kačík, František Ďurkovič, Jaroslav
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Holzforschung
Natural constituents of wood cell-wall layers are affected in various ways by thermal treatment. This study investigated the effect of high-temperature treatment on the properties of cell-wall layers. The properties were studied using PeakForce quantitative nanomechanical mapping and Fourier-transform infrared spectroscopy (FTIR). European beech wo...
