Use este identificador para citar ou linkar para este item: http://repositorio.ufla.br/jspui/handle/1/31841
Título: Accelerated sonochemical extraction of cellulose nanowhiskers
Palavras-chave: Cellulose
Hydrolysis
Nanowhiskers
Sonication
Data do documento: Jun-2016
Editor: American Scientific Publishers
Citação: SANTOS, A. S. F. et al. Accelerated sonochemical extraction of cellulose nanowhiskers. Journal of Nanoscience and Nanotechnology, [S.l.], v. 16, n. 6, p. 6535-6539, June 2016.
Resumo: Studies on sonochemical hydrolysis of cellulose have been suggested as an alternative route to obtaining cellulose nanoparticles. In this work, the potential use of acid hydrolysis assisted by sonication to obtain cellulose whiskers was studied. Parameters such as acid concentration, hydrolysis time and temperature were investigated to evaluate their effect on the morphological properties of the nanowhiskers, as compared to the conventional extraction process by acid hydrolysis with mechanical stirring. Morphology and degree of crystallinity of the nanowhiskers were studied by atomic force microscopy (AFM) and X-ray diffraction (XRD). Results indicated that the extraction time was reduced from about 45 min to less than 3 min using the same acid concentration and temperature used in conventional acid hydrolysis treatment. Likewise, it was possible, within the range of 30 min, to extract whiskers at room temperature or using half the concentration of acid by raising the temperature to about 80 °C. These are promising results towards a more economically viable and ecologically friendly extraction procedure used to obtain cellulose nanowhiskers, since both extraction time and acid concentration, used in nanowhisker extraction, were significantly reduced by replacing mechanical with sonochemical stirring.
URI: https://www.ingentaconnect.com/content/asp/jnn/2016/00000016/00000006/art00168%3bjsessionid=dqadgl4vqpsa.x-ic-live-02
http://repositorio.ufla.br/jspui/handle/1/31841
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