resumo
Vegetable cellulose fibres have been surface modified using the hydrolysis of tetraethoxysilane (TEOS), octyltrimethoxysilane (OTMS) or phenyltrimethoxysilane (PTMS), followed by the layer-by-layer deposition of previously synthesized TiO2 nanoparticles. Raman, FTIR and Si-29 Solid State NMR spectroscopies, and SEM were used to characterize the resulting nanocomposites. Water contact angle measurements were performed and the results indicate a quite distinct behaviour depending on the employed surface modification procedure. We anticipate that some of the cellulose-based composite materials have potential to be used in self-cleaning surfaces and reinforcing agents in polymer matrices, namely due to their hydrophobic surface and photostability when exposed to solar radiation. (C) 2009 Elsevier Ltd. All rights reserved.
palavras-chave
COLLOIDAL TIO2; PARTICLES; HYDROLYSIS; ADSORPTION; TITANIUM; SILANES
categoria
Materials Science
autores
Goncalves, G; Marques, PAAP; Pinto, RJB; Trindade, T; Neto, CP
nossos autores
Grupos
1 - Nanomateriais inorgânicos funcionais e híbridos orgânico-inorgânico
4 - biorrefinarias, materiais de origem biológica e reciclagem
agradecimentos
The authors thank the European Commission for the financial support of this work (SUSTAINPACK IP-500311-2).