Color stability of weathered heat-treated teak wood

Garcia, R. Á.; Lopes, Juliana de Oliveira; Nascimento, Alexandre Miguel do; Latorraca, João Vicente de Figueiredo

doi:10.4067/s0718-221x2014005000037

Cited by 23 publications

(23 citation statements)

References 16 publications

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“…The erosion process is slow and depends on several factors such as anatomy of wood, density, proportion of earlywood and latewood, grain angle and angle of exposure (Williams 2005, Garcia et al 2014. According to the results, all wood specimens exposed to UV radiation of 350 nm for all the exposure periods generally showed negative values of ∆L*.…”

Section: Resultsmentioning

confidence: 82%

Natural coloration of wood material by red beetroot (Beta vulgaris) and determination color stability under UV exposure

Yeniocak

Göktaş

Çolak

et al. 2015

Maderas, Cienc. tecnol.

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This study is aimed to develop an eco-friendly wood stained extracted from beetroot (Beta vulgaris) and determine the color stability of this stain to UV light irradiation. Natural dyestuff were extracted from beetroot by ultrasonic-assisted method and prepared from aqueous solution with ferrous sulphate, aluminum sulphate, copper sulphate and vinegar mordant mixes. Scots pine (Pinus sylvestris), oriental beech (Fagus orientalis), oak (Quercus petraea) and walnut (Juglans regia) wood specimens were used for the study. After treatment with stain, wood specimens were exposed to UV irradiation for periods of 50, 100 and 150 hours. Results showed that the color change values for all wood specimens colored with beetroot extract had better performance compared to synthetic dye. Beetroot extracts may be used as an upper surface dyestuff for indoor application and toys. Therefore, alternative to synthetic dyes more economical and eco-friendly, wood paints may be developed.

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Section: Resultsmentioning

confidence: 82%

Natural coloration of wood material by red beetroot (Beta vulgaris) and determination color stability under UV exposure

Yeniocak

Göktaş

Çolak

et al. 2015

Maderas, Cienc. tecnol.

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“…O ciclo total de exposição à radiação UV foi de 168 h à 0,68 W/m 2 com emissões de radiação no comprimento de onda de 340 nm, sendo realizadas medições de cor à cada 42 h tal como realizado por Garcia et al (2014).…”

Section: Ensaio De Envelhecimento Aceleradounclassified

Efeito de nanopartículas de ZnO na resistência da madeira de pinus tratada termicamente à radiação UV

Poubel¹,

Garcia²,

Lelis³

et al. 2017

Sci. For.

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ResumoO objetivo deste estudo foi avaliar o efeito de nanopartículas de óxido de zinco (ZnO) na estabilidade da cor da madeira de pinus tratada termicamente após exposição à radiação ultravioleta (UV). Amostras de madeira foram tratadas à 180, 200 e 220 o C durante 2 h e impregnadas com uma solução aquosa de nanopartículas de ZnO à 1,5% sob pressão e vácuo. O material foi exposto à radiação UV durante 168 h sendo efetuadas medições de cor a cada 42 h. As análises colorimétricas foram realizadas no espaço L*a*b CIE 1976. A radiação UV alterou a cor da madeira. As nanopartículas de ZnO foram ineficientes para a proteção da madeira não tratada termicamente. Entretanto, as nanopartículas associadas ao tratamento térmico à 220 o C melhorou a resistência da madeira à radiação UV.Palavras-chave: nanotecnologia, óxido de zinco, espaço de cor L*a*b* CIE 1976. AbstractThe objective of this study was to evaluate the effect of zinc oxide (ZnO) nanoparticles on the color stability of heat-treated pine wood after exposure to ultraviolet (UV) radiation. Wood samples were heat-treated at 180, 200 and 220 o C for 2 h and impregnated with a solution of 1.5% ZnO nanoparticles under pressure and vacuum. The material was exposed to UV radiation during 168 h and color measurements were taken every 42 hours. Color measurements were realized on the CIE 1976 L*a*b* space. UV radiation changed wood color. ZnO nanoparticles were ineffective to protect the untreated wood. However, nanoparticles associated to heat treatment at 220 o C improved the resistance of wood to UV radiation.

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“…The heat treatment or thermal modification has been widely studied because it promotes several advantages to the wood such as lower hygroscopicity, lower equilibrium moisture content, higher dimensional stability (Giebeler 1983), higher decay fungi resistance (Lekounougou and Kocaefe 2013) and color change (Garcia et al 2014. The heat-treated wood undergoes physical (Awoyemi andJones 2011, Bernabei andSalvatici 2016) and chemical modifications (Esteves et al 2011) but the last one is the most important in terms of impact on the properties of the material.…”

Section: Introductionmentioning

confidence: 99%

Wettability of the surface of heat-treated juvenile teak wood assessed by drop shape analyzer

Lopes

Garcia²,

Nascimento

2018

Maderas, Cienc. tecnol.

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This study investigated the effect of the heat treatment on the wettability of the surface of juvenile teak (Tectona grandis) wood assessed by drop shape analyzer. Heartwood and sapwood samples were heat-treated at 180 and 200ºC. Contact angle measurements were done every 5 s for 120 s using a KRÜSS DSA100. Heartwood had lower wettability than sapwood. Heat-treatment decreased the surface wettability of both heartwood and sapwood, especially in the wood treated at 200ºC. Heartwood had lower wettability than sapwood, even after heat treatment.

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Color stability of weathered heat-treated teak wood

Cited by 23 publications

References 16 publications

Natural coloration of wood material by red beetroot (Beta vulgaris) and determination color stability under UV exposure

Natural coloration of wood material by red beetroot (Beta vulgaris) and determination color stability under UV exposure

Efeito de nanopartículas de ZnO na resistência da madeira de pinus tratada termicamente à radiação UV

Wettability of the surface of heat-treated juvenile teak wood assessed by drop shape analyzer

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