Performance of zinc oxide and titanium dioxide nanoparticles on wood protection
Autor(a) principal: | |
---|---|
Data de Publicação: | 2019 |
Tipo de documento: | Tese |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFLA |
Texto Completo: | http://repositorio.ufla.br/jspui/handle/1/37165 |
Resumo: | The use of wood presents several advantages over synthetic polymers, being wood the preferred material for many decorative and engineering applications. Some wood species, however, have little or lack of natural resistance to biological deterioration, and need protection. Through the time, several preservative treatments have been developed, but the search for new technologies with high efficiency, low environment toxicity, andno risks to human health still have been a challenge for researchers.The use of nanoparticles on wood protection is still incipient; however, nanotechnology has advanced considerably in recent years, opening the door for new experiments and knowledge applications, in the field of wood protection. The main objective of this work was to evaluate the performance of zinc oxide (ZnO) and titanium dioxide (TiO2) nanoparticles-based treatments on wood protection. Eucalyptus urophylla wood samples, made from ~7 years old trees, were vacuum-treated (45 min vacuum at 550 mmHg) with different concentrations of ZnO and TiO2 nanoparticles in water dispersion, i.e., a) 1 (2% ZnO); b) 2 (1.5% ZnO, 0.5% TiO2); c) 3 (1% ZnO; 1% TiO2); d) 4 (0.5% ZnO; 1.5% TiO2); e) 5 (2% TiO2); f) 6 (untreated). After treatments, wood samples were subject to accelerated fungal decay, termite bioassay and weathering. Chemical retentions were analyzed by inductively coupled plasma emission spectroscopy (ICP-AES), and penetration into wood were evaluated by scanning electron microscopy with energy dispersive spectroscopy - SEM/EDS analysis. The experiment was set in a completely randomized design.Results of chemical retention showed that ZnO retention decreased according to the decreasing of the oxide concentration of each treatment. TiO2 retentions of treatments were low detectable. Penetration of ZnO and TiO2 nanoparticles could be observed for each treatment performed. Mass loss of treated wood samples exposed to rot fungal decay in soil-block tests presented different results, according to the fungus and treatment performed. Termite bioassay performed with subterranean termite had chemical synergy on treatment 2. Besides, other two treatments, 1 and 3,considered statistically equivalents, showed average mass loss of 2.4and 3.1%, respectively, values considered as a low consumption.Average rating termite mortality were evaluated after four weeks, with three treatments rated at 100% of mortality: 1, 2, and3. Regarding weathering tests, treatment 5 presented brighter than all other treatmentsin the exposed face, while untreated ones were less bright and grayer than all treatments performed. In the unexposed face, treatment 1 was less gray and brighter than all treatments, including untreated samples. Based on the results, we can conclude that both zinc oxide and titanium dioxide show potential to perform an important role on the future of wood protection, and could be included as multi-components of a new generation of nanoparticles-based wood preservatives. |
id |
UFLA_f152e929e3ca7613335b4f4fba003e04 |
---|---|
oai_identifier_str |
oai:localhost:1/37165 |
network_acronym_str |
UFLA |
network_name_str |
Repositório Institucional da UFLA |
repository_id_str |
|
spelling |
Performance of zinc oxide and titanium dioxide nanoparticles on wood protectionDesempenho de óxido de zinco e dióxido de titânio na preservação de madeirasMadeira tratadaNanotecnologiaPodridãoTérmitesIntemperismoTreated woodNanotechnologyFungal decayTermitesWeatherability resistanceTecnologia e Utilização de Produtos FlorestaisThe use of wood presents several advantages over synthetic polymers, being wood the preferred material for many decorative and engineering applications. Some wood species, however, have little or lack of natural resistance to biological deterioration, and need protection. Through the time, several preservative treatments have been developed, but the search for new technologies with high efficiency, low environment toxicity, andno risks to human health still have been a challenge for researchers.The use of nanoparticles on wood protection is still incipient; however, nanotechnology has advanced considerably in recent years, opening the door for new experiments and knowledge applications, in the field of wood protection. The main objective of this work was to evaluate the performance of zinc oxide (ZnO) and titanium dioxide (TiO2) nanoparticles-based treatments on wood protection. Eucalyptus urophylla wood samples, made from ~7 years old trees, were vacuum-treated (45 min vacuum at 550 mmHg) with different concentrations of ZnO and TiO2 nanoparticles in water dispersion, i.e., a) 1 (2% ZnO); b) 2 (1.5% ZnO, 0.5% TiO2); c) 3 (1% ZnO; 1% TiO2); d) 4 (0.5% ZnO; 1.5% TiO2); e) 5 (2% TiO2); f) 6 (untreated). After treatments, wood samples were subject to accelerated fungal decay, termite bioassay and weathering. Chemical retentions were analyzed by inductively coupled plasma emission spectroscopy (ICP-AES), and penetration into wood were evaluated by scanning electron microscopy with energy dispersive spectroscopy - SEM/EDS analysis. The experiment was set in a completely randomized design.Results of chemical retention showed that ZnO retention decreased according to the decreasing of the oxide concentration of each treatment. TiO2 retentions of treatments were low detectable. Penetration of ZnO and TiO2 nanoparticles could be observed for each treatment performed. Mass loss of treated wood samples exposed to rot fungal decay in soil-block tests presented different results, according to the fungus and treatment performed. Termite bioassay performed with subterranean termite had chemical synergy on treatment 2. Besides, other two treatments, 1 and 3,considered statistically equivalents, showed average mass loss of 2.4and 3.1%, respectively, values considered as a low consumption.Average rating termite mortality were evaluated after four weeks, with three treatments rated at 100% of mortality: 1, 2, and3. Regarding weathering tests, treatment 5 presented brighter than all other treatmentsin the exposed face, while untreated ones were less bright and grayer than all treatments performed. In the unexposed face, treatment 1 was less gray and brighter than all treatments, including untreated samples. Based on the results, we can conclude that both zinc oxide and titanium dioxide show potential to perform an important role on the future of wood protection, and could be included as multi-components of a new generation of nanoparticles-based wood preservatives.O uso da madeira apresenta inúmeras vantagens em relação a polímeros sintéticos, sendo o material preferido para diversas aplicações decorativas e de engenharia. Algumas madeiras, no entanto, apresentam baixa resistência natural a deterioração biológica e requerem tratamento. Através dos tempos, diversos tratamentos preservativos foram desenvolvidos, mas a busca por novas tecnologias de alta eficiência, baixa toxidade ao ambiente e à saúde humana continua sendo um desafio para pesquisadores. O uso de nanopartículas na proteção da madeira ainda é incipiente, mas a nanotecnologia tem avançado consideravelmente nos últimos anos, abrindo portas para novos experimentos e aplicações do conhecimento dentro da área de preservação de madeiras. O objetivo principal deste trabalho foi avaliar o desempenho de tratamentos à base de nanopartículas de óxido de zinco (ZnO) e dióxido de titânio (TiO2) na proteção da madeira.Amostras de madeira provenientes de árvores de ~7 anos de idade foram tratadas à vácuo (45 min de vácuo a 550 mmHg) com seis tratamentos contendo diferentes concentrações de nanopartículas de ZnO e TiO2 em dispersão aquosa, i.e., a) 1 (2% ZnO); b) 2 (1,5% ZnO, 0,5% TiO2); c) 3 (1% ZnO; 1% TiO2); d) 4 (0,5% ZnO; 1,5% TiO2); e) 5 (2% TiO2); f) 6 (não tratado).Após o tratamento, os corpos de prova foram submetidos a ensaios de apodrecimento acelerado, resistência à cupins subterrâneos e intemperismo. A retenção química foi avaliada por meio de espectroscopia de emissão com plasma indutivamente acoplado (ICP-AES) e a penetração na madeira foi qualitativamente avaliada por microscopia eletrônica de varredura com espectroscopia de energia dispersiva (SEM/EDS).O experimento foi realizado em delineamento inteiramente casualizado. Resultados mostraram que a retenção de ZnO decaiu com a diminuição da concentração de óxido das soluções.A retenção de TiO2nos tratamentos foi pouco detectável. A penetração do ZnO e TiO2 pôde ser observada em todos os tratamentos. A perda de massa das amostras de madeira tratada expostos ao ensaio de apodrecimento acelerado diferiu de acordo com o fungo utilizado e tratamento aplicado. O ensaio com cupins subterrâneos permitiu detectar sinergia das soluções para o tratamento 2. Além deste, os tratamentos 1 e3, considerados estatisticamente iguais, resultaram em perda de massa de 2,4% e 4,1%, respectivamente, valores considerados como baixos.A taxa de mortalidade média dos cupins foi avaliada após quatro semanas de ensaio, tendo como resultado três tratamentos ranqueados com 100% de mortalidade: tratamentos 1, 2, e 3. Em relação aos ensaios de intemperismo, o tratamento 5 resultou em madeira mais brilhantena face exposta enquanto os corpos de prova não tratados apresentaram menos brilho e tonalidade mais acinzentadaem comparação aos tratados. Na face não exposta, o tratamento 1 resultou em madeira menos cinzenta e mais brilhante do que todos os outros tratamentos, incluindo amostras não tratadas. Com base nos resultados obtidos, pode-se concluir que tanto o óxido de zinco como o dióxido de titânio apresentam potencial para desempenhar um papel importante no futuro da proteção da madeira e podem ser incluídos como multicomponentes de uma nova geração de preservativos de madeira à base de nanopartículas.Universidade Federal de LavrasPrograma de Pós-graduação em Ciência e Tecnologia da MadeiraUFLAbrasilDepartamento de Ciências FlorestaisHein, Paulo Ricardo G.Tonoli, Gustavo Henrique D.Lima, José TarcísioLima, José TarcísioPaes, Juarez BenignoAbreu, Luciana Barbosa deBorges, Willian Miguel da SilvaBorges, Cilene Cristina2019-10-10T14:47:45Z2019-10-10T14:47:45Z2019-10-092019-08-15info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisapplication/pdfBORGES, C. C. Performance of zinc oxide and titanium dioxide nanoparticles on wood protection. 2019. 65 p. Tese (Doutorado em Ciência e Tecnologia da Madeira)–Universidade Federal de Lavras, Lavras, 2019.http://repositorio.ufla.br/jspui/handle/1/37165enginfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFLAinstname:Universidade Federal de Lavras (UFLA)instacron:UFLA2019-10-10T14:47:45Zoai:localhost:1/37165Repositório InstitucionalPUBhttp://repositorio.ufla.br/oai/requestnivaldo@ufla.br || repositorio.biblioteca@ufla.bropendoar:2019-10-10T14:47:45Repositório Institucional da UFLA - Universidade Federal de Lavras (UFLA)false |
dc.title.none.fl_str_mv |
Performance of zinc oxide and titanium dioxide nanoparticles on wood protection Desempenho de óxido de zinco e dióxido de titânio na preservação de madeiras |
title |
Performance of zinc oxide and titanium dioxide nanoparticles on wood protection |
spellingShingle |
Performance of zinc oxide and titanium dioxide nanoparticles on wood protection Borges, Cilene Cristina Madeira tratada Nanotecnologia Podridão Térmites Intemperismo Treated wood Nanotechnology Fungal decay Termites Weatherability resistance Tecnologia e Utilização de Produtos Florestais |
title_short |
Performance of zinc oxide and titanium dioxide nanoparticles on wood protection |
title_full |
Performance of zinc oxide and titanium dioxide nanoparticles on wood protection |
title_fullStr |
Performance of zinc oxide and titanium dioxide nanoparticles on wood protection |
title_full_unstemmed |
Performance of zinc oxide and titanium dioxide nanoparticles on wood protection |
title_sort |
Performance of zinc oxide and titanium dioxide nanoparticles on wood protection |
author |
Borges, Cilene Cristina |
author_facet |
Borges, Cilene Cristina |
author_role |
author |
dc.contributor.none.fl_str_mv |
Hein, Paulo Ricardo G. Tonoli, Gustavo Henrique D. Lima, José Tarcísio Lima, José Tarcísio Paes, Juarez Benigno Abreu, Luciana Barbosa de Borges, Willian Miguel da Silva |
dc.contributor.author.fl_str_mv |
Borges, Cilene Cristina |
dc.subject.por.fl_str_mv |
Madeira tratada Nanotecnologia Podridão Térmites Intemperismo Treated wood Nanotechnology Fungal decay Termites Weatherability resistance Tecnologia e Utilização de Produtos Florestais |
topic |
Madeira tratada Nanotecnologia Podridão Térmites Intemperismo Treated wood Nanotechnology Fungal decay Termites Weatherability resistance Tecnologia e Utilização de Produtos Florestais |
description |
The use of wood presents several advantages over synthetic polymers, being wood the preferred material for many decorative and engineering applications. Some wood species, however, have little or lack of natural resistance to biological deterioration, and need protection. Through the time, several preservative treatments have been developed, but the search for new technologies with high efficiency, low environment toxicity, andno risks to human health still have been a challenge for researchers.The use of nanoparticles on wood protection is still incipient; however, nanotechnology has advanced considerably in recent years, opening the door for new experiments and knowledge applications, in the field of wood protection. The main objective of this work was to evaluate the performance of zinc oxide (ZnO) and titanium dioxide (TiO2) nanoparticles-based treatments on wood protection. Eucalyptus urophylla wood samples, made from ~7 years old trees, were vacuum-treated (45 min vacuum at 550 mmHg) with different concentrations of ZnO and TiO2 nanoparticles in water dispersion, i.e., a) 1 (2% ZnO); b) 2 (1.5% ZnO, 0.5% TiO2); c) 3 (1% ZnO; 1% TiO2); d) 4 (0.5% ZnO; 1.5% TiO2); e) 5 (2% TiO2); f) 6 (untreated). After treatments, wood samples were subject to accelerated fungal decay, termite bioassay and weathering. Chemical retentions were analyzed by inductively coupled plasma emission spectroscopy (ICP-AES), and penetration into wood were evaluated by scanning electron microscopy with energy dispersive spectroscopy - SEM/EDS analysis. The experiment was set in a completely randomized design.Results of chemical retention showed that ZnO retention decreased according to the decreasing of the oxide concentration of each treatment. TiO2 retentions of treatments were low detectable. Penetration of ZnO and TiO2 nanoparticles could be observed for each treatment performed. Mass loss of treated wood samples exposed to rot fungal decay in soil-block tests presented different results, according to the fungus and treatment performed. Termite bioassay performed with subterranean termite had chemical synergy on treatment 2. Besides, other two treatments, 1 and 3,considered statistically equivalents, showed average mass loss of 2.4and 3.1%, respectively, values considered as a low consumption.Average rating termite mortality were evaluated after four weeks, with three treatments rated at 100% of mortality: 1, 2, and3. Regarding weathering tests, treatment 5 presented brighter than all other treatmentsin the exposed face, while untreated ones were less bright and grayer than all treatments performed. In the unexposed face, treatment 1 was less gray and brighter than all treatments, including untreated samples. Based on the results, we can conclude that both zinc oxide and titanium dioxide show potential to perform an important role on the future of wood protection, and could be included as multi-components of a new generation of nanoparticles-based wood preservatives. |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019-10-10T14:47:45Z 2019-10-10T14:47:45Z 2019-10-09 2019-08-15 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/doctoralThesis |
format |
doctoralThesis |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
BORGES, C. C. Performance of zinc oxide and titanium dioxide nanoparticles on wood protection. 2019. 65 p. Tese (Doutorado em Ciência e Tecnologia da Madeira)–Universidade Federal de Lavras, Lavras, 2019. http://repositorio.ufla.br/jspui/handle/1/37165 |
identifier_str_mv |
BORGES, C. C. Performance of zinc oxide and titanium dioxide nanoparticles on wood protection. 2019. 65 p. Tese (Doutorado em Ciência e Tecnologia da Madeira)–Universidade Federal de Lavras, Lavras, 2019. |
url |
http://repositorio.ufla.br/jspui/handle/1/37165 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal de Lavras Programa de Pós-graduação em Ciência e Tecnologia da Madeira UFLA brasil Departamento de Ciências Florestais |
publisher.none.fl_str_mv |
Universidade Federal de Lavras Programa de Pós-graduação em Ciência e Tecnologia da Madeira UFLA brasil Departamento de Ciências Florestais |
dc.source.none.fl_str_mv |
reponame:Repositório Institucional da UFLA instname:Universidade Federal de Lavras (UFLA) instacron:UFLA |
instname_str |
Universidade Federal de Lavras (UFLA) |
instacron_str |
UFLA |
institution |
UFLA |
reponame_str |
Repositório Institucional da UFLA |
collection |
Repositório Institucional da UFLA |
repository.name.fl_str_mv |
Repositório Institucional da UFLA - Universidade Federal de Lavras (UFLA) |
repository.mail.fl_str_mv |
nivaldo@ufla.br || repositorio.biblioteca@ufla.br |
_version_ |
1807835108269359104 |