Assessment of UV-permeability in nano-ZnO filled coatings via high throughput experimentation

Lowry, Michael S.; Hubble, David R.; Wressell, A.L.; Vratsanos, Menas S.; Pepe, Frank R.; Hegedus, Charles R.

doi:10.1007/s11998-007-9064-6

Cited by 82 publications

(40 citation statements)

References 14 publications

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“…A impregnação com nanopartículas de ZnO formou uma película transparente, i.e., não alterou a cor das madeiras controle e tratadas termicamente. Segundo Lowry et al (2008), a pelí-cula transparente é possível devido ao tamanho da nanopartículas ser menor que o comprimento de onda da luz invisível (400-800 nm). Os revestimentos transparentes e opacos são de extrema importância para a indústria moveleira, já que preserva a cor original da madeira e os custos de manutenção (DERBYSHIRE et al, 1995;DHOKE et al, 2009). )…”

Section: Resultsunclassified

“…Segundo Cai (2007), as nanopartículas tem a capacidade de penetrar e modificar a parede celular e assim melhorar a estabilidade dimensional da madeira. As nanopartículas de óxido de zinco (ZnO), dióxido de silício (SiO 2 ), dióxido de titânio (TiO 2 ) e óxido de cobre (CuO) são conhecidas pela sua capacidade em absorver radiação UV (LOWRY et al, 2008;VLAD-CRISTEA et al, 2012). Clausen et al (2011) afirmam que as nanopartículas de ZnO oferecem, além da proteção a fotodegradação à longo prazo, maior resistência à degradação biológica da madeira.…”

Section: Introductionunclassified

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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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Section: Resultsunclassified

Section: Introductionunclassified

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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“…It is considered as an ideal UV blocker 48 Inorganic UV absorbers possess many advantages compared to organic absorber which includes higher thermal stability, nontoxicity, chemical stability and non-irritant nature. Similar to other nanoparticles, dispersion of znO nanoparticles in organic solvent and polymer matrices results in agglomeration of particles because of their high surface energy 49,50 . Laachachi and co-workers 51 have reported the increased thermal properties of PMMA by incorporation of znO and organo-montmorillonite.…”

Section: Zno Nanoparticlesmentioning

confidence: 99%

Modification of Softwood by Monomers and Nanofillers

Hazarika

Maji

2014

DSJ

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Technological development of wood polymer composites (WPC) is a very promising approach to overcome most of the disadvantageous properties of wood products, for example their poor mechanical strength, poor dimensional stability, susceptibility to fungal attack, weathering and the like. To find the substitute for costly items of hard wood, suitable technologies have been developed to modify softwood to meet specific end-use requirements. Various vinyl monomers and/or copolymers or thermosetting resin in combination with different types of cross linking agents, flame retarding agents have been used to improve the properties of wood. Nanotechnology is a new area of science and technology which opens up new opportunities to develop wood based products with desired properties. Now-a-days government is making strict legislations to promote green technology for the protection of environment worldwide. With the depletion of petroleum resources at alarming rate, it is high time to replace petroleum-based products by some sustainable alternative products based on vegetable biomass. The bio-based resins obtained from renewable feedstock have been widely utilized by taking the advantages of easy availability, renewable nature and low cost. The green route of modification of wood is widely encouraged. With the progress of technological development, now it is possible to avoid the hazardous influence of organic solvents by using water as solvent or diluents for modification of wood. WPC has got tremendous scope for use in diverse areas of applications.

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“…e potential use of nanomaterials for products based on natural materials, such as wood, has been investigated. e properties of wood and wood-based materials can be modi ed by the aid of nanotechnology (Lowry et al 2008, Kaygin and Akgun 2009, Ashori and Nourbakhsh 2009, Lei et al 2008. For example, the water absorption of wood can be modi ed through reinforcing of surface coating materials with nanoparticles (Gholamiyan et al 2011).…”

Section: Introductionmentioning

confidence: 99%

The potential use of organosilane water soluble nanomaterials as water vapor diffusion retarders for wood

Gholamiyan¹,

Tarmian²,

Hosseini³

et al. 2012

Maderas, Cienc. tecnol.

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ABSTRACTe retarding e ect of organosilane water soluble nanomaterials (nano-zycosil and nano-zyco l) on water vapor di usion through poplar wood (P.nigra) was evaluated in comparison with that of clear coatings (sealer and nitrocellulose lacquer and polyester lacquer) using cup and sorption methods. Two drying methods were applied to dry the nanomaterials -coated substrates: oven drying at temperature of 103 ± 2 °C for 24 h. and climatically drying at temperature of 25 °C and relative humidity of 65% for 20 minutes. e results showed that both coating materials decreased the water vapor di usion rate through the wood. e sealer and nitrocellulose lacquer coating represented a stronger e ect on the di usion coe cient of wood compared to the other coatings. In this case, the nano-zycosil represented a better performance compared to the nano-zyco l. Furthermore, the drying method of the nanomaterials -coated substrates can impact the nanomaterials performance.e water vapor di usion through the oven-dried substrates was faster than that through the climatically dried ones.

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Assessment of UV-permeability in nano-ZnO filled coatings via high throughput experimentation

Cited by 82 publications

References 14 publications

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

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

Modification of Softwood by Monomers and Nanofillers

The potential use of organosilane water soluble nanomaterials as water vapor diffusion retarders for wood

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