WOOD CHARACTERIZATION OF ADULT CLONES OF TECTONA GRANDIS GROWING IN COSTA RICA

ABSTRACT Tectona grandis is an important wood in the commercial market due to its excellent workability, durability and aesthetic characteristics. Therefore, it is important to improve the conditions of reproduction and development in commercial plantations using clone reproduction, in order to produce trees with better wood quality. In this study we analyzed the general properties, physical properties and color of 20 adult teak clones (fifteen-year-old) from the area of Guanacaste, Costa Rica. It was found that at 15 years, the clones have a diameter which varies from 19.82 cm to 30.13 cm, the percentage of heartwood ranges from 49.76 to 60.02%, and that these values are similar to those found in the literature. In regards to the physical properties, it was found that the specific gravity ranges from 0.45 to 0.60 g.cm-3, the green moisture content varies from 70% to 110.6%. In the color properties, it was found that L* values ranged from 48 to 59, a* 7 to 9.5 and b * from 20.5 to 26.3. Likewise it was determined that the color change (ΔE*) compared to commercial wood color, is commonly categorized as perceptible in all clones. However, three of the clones studied have a darker color and reddish wood which indicates a color more desirable to the end user.

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SURFACE CHEMICAL AND COLOR CHARACTERIZATION OF JUVENILE TECTONA GRANDIS WOOD SUBJECTED TO STEAM-DRYING TREATMENTS

Surface Review and Letters ◽

10.1142/s0218625x15500912 ◽

2016 ◽

Vol 23 (01) ◽

pp. 1550091 ◽

Cited By ~ 1

Author(s):

ALEXANDER BERROCAL ◽

RÓGER MOYA ◽

MARÍA RODRIGUEZ-SOLIS ◽

RICARDO STARBIRD ◽

FREDDY MUÑOZ

Keyword(s):

Color Change ◽

Tectona Grandis ◽

Surface Chemical ◽

Surface Color ◽

Teak Wood ◽

Text Color ◽

The Fourier Transform ◽

Moisture Conditions ◽

Steam Drying

The color of Tectona grandis wood is an attribute that favors its commercialization, however, wood color from fast-growth plantation trees is clear and lacks uniformity. The aim of this work is to characterize steamed teak wood by means of the Fourier transform infrared spectroscopy (FTIR) and [Formula: see text] color systems. Two moisture conditions (green and 50%) and two grain patterns (flat and quarter) of boards were analyzed through the application of different steaming times (0, 3, 6, 9, 12, 15 and 18[Formula: see text]h). The FTIR results showed that the bands at 1158, 1231, 1373 and 1419[Formula: see text]cm[Formula: see text] did not show any change with steaming, whereas the bands at 1053, 1108, 1453, 1506, 1536, 1558, 1595, 1652, 1683, 1700 and 1733[Formula: see text]cm[Formula: see text] presented a decrease in the intensity with the steaming time. The band at 1318[Formula: see text]cm[Formula: see text] was the only one that increased. Lightness ([Formula: see text]) was the most affected parameter, followed by yellowness ([Formula: see text]), while redness ([Formula: see text]) showed the smallest change. Surface color change ([Formula: see text]) presented the lowest value between 3[Formula: see text]h and 6[Formula: see text]h of steam-drying in the boards with flat grain, whereas for boards with quarter grain, the smallest [Formula: see text] value was obtained after 18[Formula: see text]h of steaming.

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ANÁLISE DA MASSA ESPECÍFICA E DA RETRATIBILIDADE DA MADEIRA DE Tectona grandis NOS SENTIDOS AXIAL E RADIAL DO TRONCO

FLORESTA ◽

10.5380/rf.v45i4.31991 ◽

2015 ◽

Vol 45 (4) ◽

pp. 671 ◽

Cited By ~ 1

Author(s):

Ghislaine Miranda Bonduelle ◽

Setsuo Iwakiri ◽

Rosilani Trianoski ◽

José Guilherme Prata ◽

Vinicius Yurk Rocha

Keyword(s):

Physical Properties ◽

Wood Density ◽

Dimensional Stability ◽

Radial Direction ◽

Wood Quality ◽

Basic Density ◽

Tectona Grandis ◽

Axial Direction ◽

Tree Trunk ◽

The City

O objetivo deste trabalho foi avaliar a massa específica e a retratibilidade da madeira nos sentidos axial e radial do tronco. Foram coletadas cinco árvores com 18 anos, provenientes do município de Brasnorte, MT, as quais foram seccionadas nas posições da base, meio e topo, para avaliação das propriedades no sentido axial. Da parte diametral das toras foram obtidos pranchões onde foram controladas as posições radiais. A avaliação da massa específica e da retratibilidade da madeira seguiu as recomendações da norma panamericana. Os resultados demonstraram que a teca possui massa específica aparente a 12% de 0,606 g.cm-3, massa especifica básica de 0,524 g.cm-3 e fator anisotrópico de 2,271. Não foram observadas grandes variações de propriedades tanto no sentido axial quanto no radial. As propriedades físicas demonstram que a madeira possui média estabilidade dimensional, podendo ser indicada para aplicações em laminação, lambris, portas, decoração e movelaria. AbstractAnalysis of wood density and shrinkage of Tectona grandis wood in axial and radial direction of the tree trunk. This research aimed to evaluate density and shrinkage of wood in axial and radial directions of the tree. We collected five trees aged 18, from the city of Brasnorte, MT, which were cut at the base, middle and top, for evaluation of the properties in axial direction. We obtained planks from the diametric part of the logs, from which we controlled radial positions. The evaluation of density and shrinkage of wood followed the panamerican standard recommendations. The results revealed that teak has apparent density at 12% of 0.606 g.cm-3, basic density 0.524 g.cm-3, and anisotropic fator of 2,271. There were no major variations in properties both in axial and radial direction. The physical properties demonstrate that the timber has medium dimensional stability, and it could be used in peeling, sidings, doors, decorating and furniture industry.Keywords: Teak; anisotropy; dimensional stability; wood quality.

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Fuel Characterization of Bio-oil from Fast Pyrolysis of Tectona grandis in a Fixed Bed Reactor

International Journal of Energy for a Clean Environment ◽

10.1615/interjenercleanenv.2020035930 ◽

2020 ◽

Author(s):

Pious Okekunle ◽

Akinola Ogunsola ◽

Oluwapelumi Babayemi ◽

Emmanuel Abodunrin ◽

Olanrewaju Daramola

Keyword(s):

Fast Pyrolysis ◽

Fixed Bed ◽

Tectona Grandis ◽

Fixed Bed Reactor ◽

Bio Oil ◽

Fuel Characterization

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Green Synthesis and Spectroscopic Studies of Ag-rGO Nanocomposites for Highly Selective Mercury (II) Sensing

Nanoscience &Nanotechnology-Asia ◽

10.2174/2210681207666170705143629 ◽

2018 ◽

Vol 9 (1) ◽

pp. 101-108 ◽

Cited By ~ 1

Author(s):

Shubhangi J. Mane-Gavade ◽

Sandip R. Sabale ◽

Xiao-Ying Yu ◽

Gurunath H. Nikam ◽

Bhaskar V. Tamhankar

Keyword(s):

Green Synthesis ◽

Color Change ◽

Limit Of Detection ◽

Aqueous Media ◽

Suitable Condition ◽

Cost Effective ◽

Spectroscopic Studies ◽

Calibration Plot ◽

First Time

Introduction: Herein we report the green synthesis and characterization of silverreduced graphene oxide nanocomposites (Ag-rGO) using Acacia nilotica gum for the first time. Experimental: We demonstrate the Hg2+ ions sensing ability of the Ag-rGO nanocomposites form aqueous medium. The developed colorimetric sensor method is simple, fast and selective for the detection of Hg2+ ions in aqueous media in presence of other associated ions. A significant color change was noticed with naked eye upon Hg2+ addition. The color change was not observed for cations including Sr2+, Ni2+, Cd2+, Pb2+, Mg2+, Ca2+, Fe2+, Ba2+ and Mn2+indicating that only Hg2+ shows a strong interaction with Ag-rGO nanocomposites. Under the most suitable condition, the calibration plot (A0-A) against concentration of Hg2+ was linear in the range of 0.1-1.0 ppm with a correlation coefficient (R2) value 0.9998. Results & Conclusion The concentration of Hg2+ was quantitatively determined with the Limit of Detection (LOD) of 0.85 ppm. Also, this method shows excellent selectivity towards Hg2+ over nine other cations tested. Moreover, the method offers a new cost effective, rapid and simple approach for the detection of Hg2+ in water samples.

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