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Registro Completo |
Biblioteca(s): |
Embrapa Florestas. |
Data corrente: |
08/06/2017 |
Data da última atualização: |
11/07/2017 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
CADEMARTORI, P. H. G. de; STAFFORD, L.; BLANCHET, P.; MAGALHAES, W. L. E.; BOLZON DE MUNIZ, G. I. |
Afiliação: |
Pedro Henrique Gonzalez de Cademartori, Doutorando da UFPR; Luc Stafford, Departement de Physique, Universite de Montreal; Pierre Blanchet, NSERC; WASHINGTON LUIZ ESTEVES MAGALHAES, CNPF; Graciela Ines Bolzon de Muniz, UFPR. |
Título: |
Enhancing the water repellency of wood surfaces by atmospheric pressure cold plasma deposition of fluorocarbon film. |
Ano de publicação: |
2017 |
Fonte/Imprenta: |
RSC Advances, v. 7, n. 46, p. 29159-29169, Jun. 2017. |
DOI: |
10.1039/c7ra03334f |
Idioma: |
Inglês |
Conteúdo: |
In this study, fluorocarbon thin filmsweredepositedonthe surfaceofwhite spruce andBrazilian cedarwoods via atmospheric pressure dielectric barrier discharge in the afterglow mode with octafluoropropane gas. A pretreatment with oxygen plasma was introduced before the thin film deposition to determine if this plasma condition could increase the wood nano/micro roughness, helping to improve the hydrophobicity of the surface. The optimal conditions of water repellency for both woods were examined in terms of their resistance to aging in controlled conditions. The water contact angle measurements showed a hydrophobic surface with a stable angle for both woods. X-ray photoelectron spectroscopy reveals the presence of CF, CF2 and CF3 functional groups after the Ar/C3F8 plasma, especially for longer treatments. The open-air system of the plasma reactor leads to the simultaneous fluorination and incorporation of oxygen-containing groups. The pre-treatment of oxygen plasma increases the wood roughness; however, the chemical attachment of oxygen molecules is more significant, negatively affecting the degree of repellency of the plasma-coated woods. On the other hand, the fluorocarbon deposition increases the wood roughness and creates a hydrophobic surface simultaneously. Even with partial defluorination after aging, both plasma-coated woods retain a similar degree of water repellency, which partially avoid chemical reorganization of their surface due to environmental exposure. |
Palavras-Chave: |
Atmospheric plasma; Filme de fluorcarbono; Hydrophobic surface; Molhabilidade; Plasma a frio; Plasma atmosférico; Plasma treatment; Superfície hidrofóbica; Surface modification; Wetting. |
Thesagro: |
Madeira. |
Thesaurus Nal: |
Wood treatment. |
Categoria do assunto: |
X Pesquisa, Tecnologia e Engenharia |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/160655/1/2017-Washington-RCSA-Enhancing.pdf
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Marc: |
LEADER 02486naa a2200325 a 4500 001 2070623 005 2017-07-11 008 2017 bl uuuu u00u1 u #d 024 7 $a10.1039/c7ra03334f$2DOI 100 1 $aCADEMARTORI, P. H. G. de 245 $aEnhancing the water repellency of wood surfaces by atmospheric pressure cold plasma deposition of fluorocarbon film.$h[electronic resource] 260 $c2017 520 $aIn this study, fluorocarbon thin filmsweredepositedonthe surfaceofwhite spruce andBrazilian cedarwoods via atmospheric pressure dielectric barrier discharge in the afterglow mode with octafluoropropane gas. A pretreatment with oxygen plasma was introduced before the thin film deposition to determine if this plasma condition could increase the wood nano/micro roughness, helping to improve the hydrophobicity of the surface. The optimal conditions of water repellency for both woods were examined in terms of their resistance to aging in controlled conditions. The water contact angle measurements showed a hydrophobic surface with a stable angle for both woods. X-ray photoelectron spectroscopy reveals the presence of CF, CF2 and CF3 functional groups after the Ar/C3F8 plasma, especially for longer treatments. The open-air system of the plasma reactor leads to the simultaneous fluorination and incorporation of oxygen-containing groups. The pre-treatment of oxygen plasma increases the wood roughness; however, the chemical attachment of oxygen molecules is more significant, negatively affecting the degree of repellency of the plasma-coated woods. On the other hand, the fluorocarbon deposition increases the wood roughness and creates a hydrophobic surface simultaneously. Even with partial defluorination after aging, both plasma-coated woods retain a similar degree of water repellency, which partially avoid chemical reorganization of their surface due to environmental exposure. 650 $aWood treatment 650 $aMadeira 653 $aAtmospheric plasma 653 $aFilme de fluorcarbono 653 $aHydrophobic surface 653 $aMolhabilidade 653 $aPlasma a frio 653 $aPlasma atmosférico 653 $aPlasma treatment 653 $aSuperfície hidrofóbica 653 $aSurface modification 653 $aWetting 700 1 $aSTAFFORD, L. 700 1 $aBLANCHET, P. 700 1 $aMAGALHAES, W. L. E. 700 1 $aBOLZON DE MUNIZ, G. I. 773 $tRSC Advances$gv. 7, n. 46, p. 29159-29169, Jun. 2017.
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Registro original: |
Embrapa Florestas (CNPF) |
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Biblioteca(s): |
Embrapa Amazônia Oriental. |
Data corrente: |
29/09/2000 |
Data da última atualização: |
08/02/2023 |
Autoria: |
FIGUEIREDO, F. J. C.; ROCHA NETO, O. G. da; CARVALHO, C. J. R. de. |
Afiliação: |
FRANCISCO JOSE CAMARA FIGUEIREDO, CPATU; OLINTO GOMES DA ROCHA NETO, CPATU; CLAUDIO JOSE REIS DE CARVALHO, CPATU. |
Título: |
Emergência e mobilização de reservas de sementes de cupuaçuzeiro na ausência de luz. |
Ano de publicação: |
1999 |
Fonte/Imprenta: |
Belém, PA: Embrapa Amazônia Oriental, 1999. |
Páginas: |
37 p. |
Descrição Física: |
il. |
Série: |
(Embrapa Amazônia Oriental. Boletim de pesquisa, 8). |
Idioma: |
Português |
Conteúdo: |
O objetivo deste trabalho foi o de estudar alguns aspectos de emergência e da mobilização de reservas de sementes de cupuaçuzeiro (Theobromagrandiflorum (Willd. ex.Spreng) Schum.) na ausência da luz, em sala de crescimento, sob condições de temperatura e umidade relativa de Belém, PA. |
Palavras-Chave: |
Ácidos graxos; Açúcares solúveis; Aminoácidos; Analise da semente; Belem; Brasil; Carbohydrato; Carboidratos; Emergence; Fisiologia da semente; Lipídios; Para; Proteínas; Seed; Seed analysis; Seed longevity; Seed physiology; Seed testing; Soluble sugars; St6arch; Teste de emergencia; Vigour. |
Thesagro: |
Amido; Análise; Cupuaçu; Fisiologia; Fósforo; Fruta; Iluminação; Nitrogênio; Potássio; Semente; Teste de Sementes; Teste de Vigor; Theobroma Grandiflorum. |
Thesaurus NAL: |
Amazonia; amino acids; fatty acids; fruits; lighting; nitrogen; phosphorus; potassium; proteins; seeds; vigor. |
Categoria do assunto: |
-- |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/40516/1/Boletim-Pesquisa-8-CPATU.pdf
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Marc: |
LEADER 02071nam a2200709 a 4500 001 1377391 005 2023-02-08 008 1999 bl uuuu u0uu1 u #d 100 1 $aFIGUEIREDO, F. J. C. 245 $aEmergência e mobilização de reservas de sementes de cupuaçuzeiro na ausência de luz. 260 $aBelém, PA: Embrapa Amazônia Oriental$c1999 300 $a37 p.$cil. 490 $a(Embrapa Amazônia Oriental. Boletim de pesquisa, 8). 520 $aO objetivo deste trabalho foi o de estudar alguns aspectos de emergência e da mobilização de reservas de sementes de cupuaçuzeiro (Theobromagrandiflorum (Willd. ex.Spreng) Schum.) na ausência da luz, em sala de crescimento, sob condições de temperatura e umidade relativa de Belém, PA. 650 $aAmazonia 650 $aamino acids 650 $afatty acids 650 $afruits 650 $alighting 650 $anitrogen 650 $aphosphorus 650 $apotassium 650 $aproteins 650 $aseeds 650 $avigor 650 $aAmido 650 $aAnálise 650 $aCupuaçu 650 $aFisiologia 650 $aFósforo 650 $aFruta 650 $aIluminação 650 $aNitrogênio 650 $aPotássio 650 $aSemente 650 $aTeste de Sementes 650 $aTeste de Vigor 650 $aTheobroma Grandiflorum 653 $aÁcidos graxos 653 $aAçúcares solúveis 653 $aAminoácidos 653 $aAnalise da semente 653 $aBelem 653 $aBrasil 653 $aCarbohydrato 653 $aCarboidratos 653 $aEmergence 653 $aFisiologia da semente 653 $aLipídios 653 $aPara 653 $aProteínas 653 $aSeed 653 $aSeed analysis 653 $aSeed longevity 653 $aSeed physiology 653 $aSeed testing 653 $aSoluble sugars 653 $aSt6arch 653 $aTeste de emergencia 653 $aVigour 700 1 $aROCHA NETO, O. G. da 700 1 $aCARVALHO, C. J. R. de
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