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Bacterial cellulose nanocrystals produced under different hydrolysis conditions: properties and morphological features. Repositório Alice
VASCONCELOS, N. F.; FEITOSA, J. P. DE A.; GAMA, F. M. P. DA; MORAIS, J. P. S.; ANDRADE, F. K.; SOUZA FILHO, M. de S. M. de; ROSA, M. de F..
Bacterial cellulose (BC) is a polymer with interesting physical properties owing to the regular and uniformstructure of its nanofibers, which are formed by amorphous (disordered) and crystalline (ordered) regions.Through hydrolysis with strong acids, it is possible to transform BC into a stable suspension of cellulosenanocrystals, adding new functionality to the material. The aim of this work was to evaluate the effectsof inorganic acids on the production of BC nanocrystals (BCNCs). Acid hydrolysis was performed usingdifferent H2SO4concentrations and reaction times, and combined hydrolysis with H2SO4and HCl wasalso investigated. The obtained cellulose nanostructures were needle-like with lengths ranging between622 and 1322 nm, and diameters ranging between...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Nanocristais de celulose; Celulose bacteriana; Hidrólise; Ácido sulfúrico; Ácido clorídrico; Hydrolysis; Sulfuric acid; Hydrochloric acid.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1083533
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Stable microfluidized bacterial cellulose suspension. Repositório Alice
ANDRADE, F. K.; MORAIS, J. P. S.; MUNIZ, C. R.; NASCIMENTO, J. H. O. DO; VIEIRA, R. S.; GAMA, F. M. P. DA; ROSA, M. de F..
In this work, nanofibrillated suspensions of bacterial cellulose (BC) were produced via microfluidization. The effects of the size of the openings of the microfluidizer chamber and ultrasonication on the nanofibril properties were evaluated. The results of the X-ray diffraction analysis indicated a considerable reduction in BC crystallinity (86?65%) and crystallite size (5.8?4.0 nm) after microfluidization and ultrasonication. Thermal analysis showed a remarkable reduction from 337 to 283ªC in the initial temperature of degradation along the several steps of BC deconstruction. Moreover, infrared analysis indicated that both processes led to an increase in the Ib content (43?66%) of the fibers. Morphological analysis showed that the fibrillation process...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Celulose bacteriana; Celulose nanofibrilada; Microfluidização; Nanofibrillated cellulose; Microfluidization; Sterilization; Celulose; Esterilização.
Ano: 2019 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1118741
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