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Registro Completo |
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Biblioteca(s): |
Embrapa Instrumentação; Embrapa Pantanal. |
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Data corrente: |
08/11/2019 |
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Data da última atualização: |
08/11/2019 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
CORRÊA, A. C.; CARMONA, V. B.; SIMÃO, J. A.; GALVANI, F.; MARCONCINI, J. M.; MATTOSO, L. H. C. |
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Afiliação: |
ANA CAROLINA CORRÊA; VITOR BRAIT CARMONA, UFSCar; JOSÉ ALEXANDRE SIMÃO, UFSCar; FABIO GALVANI, CPAP; JOSE MANOEL MARCONCINI, CNPDIA; LUIZ HENRIQUE CAPPARELLI MATTOSO, CNPDIA. |
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Título: |
Cellulose nanocrystals from fibers of Macauba (Acrocomia Aculeata) and Gravata (Bromelia Balansae) from Brazilian Pantanal. |
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Ano de publicação: |
2019 |
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Fonte/Imprenta: |
Polymers, v. 11, n. 1785, p. 1-19, 2019. |
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DOI: |
doi:10.3390/polym11111785 |
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Idioma: |
Inglês |
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Conteúdo: |
Cellulose nanocrystals (CNC) were obtained from macauba and gravata fibers. Macauba (or Bocaiuva) is a palm tree found throughout most of Brazil and Gravata is an abundant kind of bromeliab with 1-2m long leaves, found in Brazilian Pantanal and Cerrado. The raw fibers of both fibers were mercerized with NaOH solutions and bleached; they were then submitted to acid hydrolysis using H2SO4 at 45 ?C, varying the hydrolysis time from 15 up to 75 min. The fibers were analyzed by X-ray diffraction (XRD), FTIR Spectroscopy, scanning electron microscopy (SEM) and thermal stability by thermogravimetric analysis (TG). XRD patterns did not present changes in the crystal structure of cellulose after mercerization, but it was observed a decrease of hemicellulose and lignin contents, and consequently an increase of cellulose content with the increase of NaOH solution concentration in the mercerization. After acid hydrolysis, the cellulose nanocrystals (CNC) were also analyzed by transmission electron microscopy (TEM) which showed an acicular or rod-like aspect and nanometric dimensions of CNC from both fibers, but the higher values of aspect ratio (L/D) were found on CNC obtained from gravata after 45 min of acid hydrolysis. The mercerization and subsequent bleaching of fibers influenced the crystallinity index and thermal stability of the resulting CNC, but their properties are mainly influenced by the hydrolysis time, i. e., there is an increase in crystallinity and thermal stability up to 45 min of hydrolysis, after this time, both properties decrease, probably due to the cellulose degradation by the sulfuric acid. MenosCellulose nanocrystals (CNC) were obtained from macauba and gravata fibers. Macauba (or Bocaiuva) is a palm tree found throughout most of Brazil and Gravata is an abundant kind of bromeliab with 1-2m long leaves, found in Brazilian Pantanal and Cerrado. The raw fibers of both fibers were mercerized with NaOH solutions and bleached; they were then submitted to acid hydrolysis using H2SO4 at 45 ?C, varying the hydrolysis time from 15 up to 75 min. The fibers were analyzed by X-ray diffraction (XRD), FTIR Spectroscopy, scanning electron microscopy (SEM) and thermal stability by thermogravimetric analysis (TG). XRD patterns did not present changes in the crystal structure of cellulose after mercerization, but it was observed a decrease of hemicellulose and lignin contents, and consequently an increase of cellulose content with the increase of NaOH solution concentration in the mercerization. After acid hydrolysis, the cellulose nanocrystals (CNC) were also analyzed by transmission electron microscopy (TEM) which showed an acicular or rod-like aspect and nanometric dimensions of CNC from both fibers, but the higher values of aspect ratio (L/D) were found on CNC obtained from gravata after 45 min of acid hydrolysis. The mercerization and subsequent bleaching of fibers influenced the crystallinity index and thermal stability of the resulting CNC, but their properties are mainly influenced by the hydrolysis time, i. e., there is an increase in crystallinity and thermal stability up ... Mostrar Tudo |
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Palavras-Chave: |
Cellulose nanocrystals; Characterization; Pantanal fibers. |
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Thesagro: |
Celulose; Fibra Vegetal; Gravata; Macaúba. |
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Thesaurus Nal: |
Acrocomia; Cellulose; Nanocrystals; Plant fibers. |
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Categoria do assunto: |
K Ciência Florestal e Produtos de Origem Vegetal |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/204457/1/Cellulose-nanocrystals-macauba-gravata-2019.pdf
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Marc: |
LEADER 02563naa a2200325 a 4500
001 2114101
005 2019-11-08
008 2019 bl uuuu u00u1 u #d
024 7 $adoi:10.3390/polym11111785$2DOI
100 1 $aCORRÊA, A. C.
245 $aCellulose nanocrystals from fibers of Macauba (Acrocomia Aculeata) and Gravata (Bromelia Balansae) from Brazilian Pantanal.$h[electronic resource]
260 $c2019
520 $aCellulose nanocrystals (CNC) were obtained from macauba and gravata fibers. Macauba (or Bocaiuva) is a palm tree found throughout most of Brazil and Gravata is an abundant kind of bromeliab with 1-2m long leaves, found in Brazilian Pantanal and Cerrado. The raw fibers of both fibers were mercerized with NaOH solutions and bleached; they were then submitted to acid hydrolysis using H2SO4 at 45 ?C, varying the hydrolysis time from 15 up to 75 min. The fibers were analyzed by X-ray diffraction (XRD), FTIR Spectroscopy, scanning electron microscopy (SEM) and thermal stability by thermogravimetric analysis (TG). XRD patterns did not present changes in the crystal structure of cellulose after mercerization, but it was observed a decrease of hemicellulose and lignin contents, and consequently an increase of cellulose content with the increase of NaOH solution concentration in the mercerization. After acid hydrolysis, the cellulose nanocrystals (CNC) were also analyzed by transmission electron microscopy (TEM) which showed an acicular or rod-like aspect and nanometric dimensions of CNC from both fibers, but the higher values of aspect ratio (L/D) were found on CNC obtained from gravata after 45 min of acid hydrolysis. The mercerization and subsequent bleaching of fibers influenced the crystallinity index and thermal stability of the resulting CNC, but their properties are mainly influenced by the hydrolysis time, i. e., there is an increase in crystallinity and thermal stability up to 45 min of hydrolysis, after this time, both properties decrease, probably due to the cellulose degradation by the sulfuric acid.
650 $aAcrocomia
650 $aCellulose
650 $aNanocrystals
650 $aPlant fibers
650 $aCelulose
650 $aFibra Vegetal
650 $aGravata
650 $aMacaúba
653 $aCellulose nanocrystals
653 $aCharacterization
653 $aPantanal fibers
700 1 $aCARMONA, V. B.
700 1 $aSIMÃO, J. A.
700 1 $aGALVANI, F.
700 1 $aMARCONCINI, J. M.
700 1 $aMATTOSO, L. H. C.
773 $tPolymers$gv. 11, n. 1785, p. 1-19, 2019.
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Registro original: |
Embrapa Pantanal (CPAP) |
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| 1. |  | LIU, J.; HULL, V.; BATISTELLA, M.; DEFRIES, R.; DIETZ, T.; FU, F.; HERTEL, T. W.; IZAURRALDE, R. C.; LAMBIN, E. F.; LI, S.; MARTINELLI, L. A.; MCCONNELL, W. J.; MORAN, E. F.; NAYLOR, R.; OUYANG, Z.; POLENSKE, K. R.; REENBERG, A.; ROCHA, G. DE M.; SIMMONS, C. S.; VERBURG, P. H.; VITOUSEK, P. M.; ZHANG, F.; ZHU, C. Framing sustainability in a telecoupled world. Ecology and Society, v. 18, n. 2, jun. 2013. 19 p.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 1 |
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| 2. | | HERRERO, M.; THORNTON, P. K.; MASON-D'CROZ, D.; PALMER, J.; BENTON, T. G.; BODIRSKY, B. L.; BOGARD, J. R.; HALL, A.; LEE, B.; NYBORG, K.; PRADHAN, P.; BONNETT, G. D.; BRYAN, B. A.; CAMPBELL, B. M.; CHRISTENSEN, S.; CLARK, M.; COOK, M. T.; BOER, I. J. M. de; DOWNS, C.; DIZYEE, K.; FOLBERTH, C.; GODDE, C. M.; GERBER, J. S.; GRUNDY, M.; HAVLIK, P.; JARVIS, A.; KING, R.; LOBOGUERRERO, A. M.; LOPES, M. A.; MCLNTYRE, C. L.; NAYLOR, R.; NAVARRO, J.; OBERSTEINER, M.; PARODI, A.; PEOPLES, M. B.; PIKAAR, I.; POPP, A.; ROCKSTROM, J.; ROBERTSON, M. J.; SMITH, P.; STEHFEST, E.; SWAIN, S. M.; VALIN, H.; VAN WIJK, M.; VAN ZANTEN, H. H. E.; VERMEULEN, S.; VERVOORT, J.; WEST, P. C. Innovation can accelerate the transition towards a sustainable food system. Nature Food, v. 1, p. 266-272, May 2020. Perspective.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: B - 5 |
| Biblioteca(s): Embrapa Agroenergia. |
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