Revue: | Maderas : ciencia y tecnología |
Base de datos: | |
Número de sistema: | 000534601 |
ISSN: | 0718-221X |
Autores: | Zanatta, Paula1 Missio, André Luiz2 Lazarotto, Marília3 Cava, Sérgio da Silva1 Jardim, Pedro Lovato Gomes4 Gatto, Darci Alberto1 Moreira, Mário Lúcio1 |
Instituciones: | 1Universidade Federal de Pelotas Centro de Desenvolvimento Tecnológico, RS. Brasil 2Universidade Federal de Santa Maria Centro de Ciências Rurais Laboratório de Produtos Florestais, Santa Maria RS. Brasil 3Universidade Federal do Rio Grande do Sul Faculdade de Agronomia Departamento de Horticultura e Floricultura, Porto Alegre RS. Brasil 4Universidade Federal de Pelotas Instituto de Física e Matemática Departamento de Física, RS. Brasil |
Año: | 2018 |
Volumen: | 20 |
Número: | 4 |
Paginación: | 611-620 |
País: | Chile |
Idioma: | Inglés |
Resumen en inglés | The objective of this work was to form a hydrophobic surface in a highly porous wood by coating and incorporating TiO2 micro/nano structures through the microwave-assisted solvotermal method, without need any pre- or post-modification of the wood substrate, using low temperatures and short times. The behavior and morphology of the TiO2-treated surfaces was characterized using scanning electron microscopy (SEM), while the elemental composition was determined via energy-dispersive X-ray spectroscopy and X-ray diffraction analysis. The results indicated that the crystallization of the TiO2 anatase phase was efficient and fully coated the wood surface during the solvothermal process. The treated wood contained TiO2 particles agglomerate with an average diameter of 200 nm that also allowed to coat an abundant fraction of tracheids cell walls. When investigated through X-ray spectroscopy-mapping, the element titanium appeared abundantly throughout the wood. After TiO2 growth in wood through the microwave-assisted solvotermal method, a roughness at the micro/nano scales structures was created on the wood surface, originating an increase in the contact angle up to 137°, which characterizes the appearance of a hydrophobic surface. The TiO2-treated wood demonstrated 85% of water absorption after 400 h of immersion, while untreated wood reached 160%, suggesting that the microwave-assisted solvotermal process promotes a delay in the progression of water absorption. This feature can improve the dimensional stability of wood, contributing to the increase of its durability and applications. |
Keyword: | Nanoparticles, Pinus elliotti, Wettability, Wood modification, Wood technology. |
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