2012
DOI: 10.1021/bm201777j
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Supramolecular Structure Characterization of Cellulose II Nanowhiskers Produced by Acid Hydrolysis of Cellulose I Substrates

Abstract: Cellulose II nanowhiskers (CNW-II) were produced by treatment of microcrystalline cellulose with sulfuric acid by both controlling the amount of H(2)SO(4) introduced and the time of addition during the hydrolysis process. The crystalline structure was confirmed by both XRD and (13)C CP-MAS NMR spectroscopy. When observed between crossed polarizers, the cellulose II suspension displayed flow birefringence and was stable for several months. The CNW-II nanowhiskers were significantly smaller than the cellulose I … Show more

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Cited by 220 publications
(142 citation statements)
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“…[37] que caracterizaram fibras de mesocarpo de dendê por MEV e MET, hidrolisados sob as mesmas condições de concentração de H 2 SO 4 e temperatura, no entanto, sob maior tempo de exposição ao H 2 SO 4 (150 min). Tais variações nas condições podem ser responsáveis pela diferença na medida do comprimento dos CNCs [17].…”
Section: Resultsunclassified
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“…[37] que caracterizaram fibras de mesocarpo de dendê por MEV e MET, hidrolisados sob as mesmas condições de concentração de H 2 SO 4 e temperatura, no entanto, sob maior tempo de exposição ao H 2 SO 4 (150 min). Tais variações nas condições podem ser responsáveis pela diferença na medida do comprimento dos CNCs [17].…”
Section: Resultsunclassified
“…A etapa de branqueamento com H 2 O 2 foi repetida, evidenciando que este processo promove a dissolução de gorduras, minerais, parte da hemicelulose e quebra da lignina, entre outros cromóforos, tornando a fibra mais clara. Posteriormente, as fibras foram submetidas à hidrólise ácida, utilizando ácido sulfúrico (H 2 SO 4 ) 64% m/v, durante 1h10 min, sob uma temperatura de 45°C, numa razão ácido-fibra de 12,5 mL.g -1 para obtenção dos CNCs conforme proposto por Sèbe et al (2012) [17]. Manga (NM).…”
Section: Preparo Dos Cncsunclassified
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“…The dimensions and stiffness of CNW depend on cellulose source and conditions of hydrolysis such as time and temperature [117][118][119][120][121][122][123]. Several recent studies optimized the preparation conditions for pea hull fibers [117], coconut husk [118], kenaf bast fibers [119], grass (Zoysa japonica and Z. tenuifolia) [120], curauá (pineapple) fibers [121], rice straw [122] and microcrystalline cellulose [123].…”
Section: Cellulose Nanocrystals/nanowhiskersmentioning
confidence: 99%
“…CNW are highly crystalline needle-shaped cellulose particles with one of its dimensions equal to or less than 100 nm (Sebe et al 2012;Chen et al 2014;Xu et al 2014). Even a very low amount of CNW incorporation as reinforcement material in polymer has been found to significantly improve thermal, mechanical, and barrier properties of composite materials as compared to the conventional composites (OsorioMadrazo et al 2012;Chen et al 2014).…”
Section: Introductionmentioning
confidence: 99%