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Registro Completo |
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Biblioteca(s): |
Embrapa Florestas. |
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Data corrente: |
05/11/2009 |
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Data da última atualização: |
24/02/2015 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
MAGALHÃES, W. L. E.; XIAODONG, C.; LUCIA, L. A. |
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Afiliação: |
WASHINGTON LUIZ ESTEVES MAGALHAES, CNPF; XIAODONG CAO, SOUTH CHINA UNIVERSITY OF TECHNOLOGY; LUCIAN A. LUCIA, NORTH CAROLINA STATE UNIVERSITY. |
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Título: |
Cellulose nanocrystals: celulose core-in-shell nanocomposite assemblies. |
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Ano de publicação: |
2009 |
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Fonte/Imprenta: |
Langmuir, v. 25, n. 22, p. 13250-257, set. 2009. |
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Idioma: |
Inglês |
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Conteúdo: |
We report herein for the first time how a co-electrospinning technique can be used to overcome the issue of orienting cellulose nanocrystals within a neat cellulose matrix.Ahome-built co-electrospinning apparatus was fabricated that was comprised of a high-voltage power supply, two concentric capillary needles, and one screw-type pump syringe. Eucalyptus-derived cellulose was dissolved inN-methylmorpholine oxide (NMMO) at 120 C and diluted with dimethyl sulfoxide (DMSO) which was used in the external concentric capillary needle as the shell solution. A cellulose nanocrystal suspension obtained by the sulfuric acid hydrolysis of bleached sisal and cotton fibers was used as the core liquid in the internal concentric capillary needle. Three flow rate ratios between the shell and core, four flow rates for the shell dope solution, and four high voltages were tested. The resultant co-electrospun composite fibers were collected onto a grounded metal screen immersed in cold water. Micrometer and submicrometer cellulose fiber assemblies were obtained which were reinforced with cellulose nanocrystals and characterized by FESEM, FTIR, TGA, and XRD. Surprisingly, it was determined that the physical properties for the cellulose controls are superior to the composites; in addition, the crystallinity of the controls was slightly greater. |
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Palavras-Chave: |
Nanotecnologia. |
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Thesagro: |
Celulose. |
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Categoria do assunto: |
W Química e Física |
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Marc: |
LEADER 01832naa a2200169 a 4500
001 1574105
005 2015-02-24
008 2009 bl uuuu u00u1 u #d
100 1 $aMAGALHÃES, W. L. E.
245 $aCellulose nanocrystals$bcelulose core-in-shell nanocomposite assemblies.$h[electronic resource]
260 $c2009
520 $aWe report herein for the first time how a co-electrospinning technique can be used to overcome the issue of orienting cellulose nanocrystals within a neat cellulose matrix.Ahome-built co-electrospinning apparatus was fabricated that was comprised of a high-voltage power supply, two concentric capillary needles, and one screw-type pump syringe. Eucalyptus-derived cellulose was dissolved inN-methylmorpholine oxide (NMMO) at 120 C and diluted with dimethyl sulfoxide (DMSO) which was used in the external concentric capillary needle as the shell solution. A cellulose nanocrystal suspension obtained by the sulfuric acid hydrolysis of bleached sisal and cotton fibers was used as the core liquid in the internal concentric capillary needle. Three flow rate ratios between the shell and core, four flow rates for the shell dope solution, and four high voltages were tested. The resultant co-electrospun composite fibers were collected onto a grounded metal screen immersed in cold water. Micrometer and submicrometer cellulose fiber assemblies were obtained which were reinforced with cellulose nanocrystals and characterized by FESEM, FTIR, TGA, and XRD. Surprisingly, it was determined that the physical properties for the cellulose controls are superior to the composites; in addition, the crystallinity of the controls was slightly greater.
650 $aCelulose
653 $aNanotecnologia
700 1 $aXIAODONG, C.
700 1 $aLUCIA, L. A.
773 $tLangmuir$gv. 25, n. 22, p. 13250-257, set. 2009.
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Embrapa Florestas (CNPF) |
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Biblioteca(s): |
Embrapa Solos. |
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Data corrente: |
23/02/2017 |
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Data da última atualização: |
10/11/2021 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Autoria: |
MARTINHO, A. E. de F.; MATTOS, B. B.; SOUZA, F. H. de; SANTOS, D. N. dos; BENITES, V. de M.; TEIXEIRA, P. C. |
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Afiliação: |
ANA ELIZA DE FREITAS MARTINHO; BIANCA BRAZ MATTOS, CNPS; FRANCYNE HELENA DE SOUZA; DÉBORA NOBREGA DOS SANTOS; VINICIUS DE MELO BENITES, CNPS; PAULO CESAR TEIXEIRA, CNPS. |
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Título: |
Fluxo difusivo de fósforo a partir da aplicação de fertilizantes organominerais de base fosfatada. |
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Ano de publicação: |
2016 |
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Fonte/Imprenta: |
In: REUNIÃO BRASILEIRA DE FERTILIDADE DO SOLO E NUTRIÇÃO DE PLANTAS, 32.; REUNIÃO BRASILEIRA SOBRE MICORRIZAS, 16.; SIMPÓSIO BRASILEIRO DE MICROBIOLOGIA DO SOLO, 14.; REUNIÃO BRASILEIRA DE BIOLOGIA DO SOLO, 11., 2016, Goiânia. Rumo aos novos desafios: anais. Goiânia: SBCS, Núcleo Regional Centro-Oeste, 2016. FertBio 2016. |
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Idioma: |
Português |
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Palavras-Chave: |
Mobilidade; Organomineral; P disponível. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/156510/1/2016-166.pdf
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Marc: |
LEADER 00905nam a2200193 a 4500
001 2065316
005 2021-11-10
008 2016 bl uuuu u00u1 u #d
100 1 $aMARTINHO, A. E. de F.
245 $aFluxo difusivo de fósforo a partir da aplicação de fertilizantes organominerais de base fosfatada.$h[electronic resource]
260 $aIn: REUNIÃO BRASILEIRA DE FERTILIDADE DO SOLO E NUTRIÇÃO DE PLANTAS, 32.; REUNIÃO BRASILEIRA SOBRE MICORRIZAS, 16.; SIMPÓSIO BRASILEIRO DE MICROBIOLOGIA DO SOLO, 14.; REUNIÃO BRASILEIRA DE BIOLOGIA DO SOLO, 11., 2016, Goiânia. Rumo aos novos desafios: anais. Goiânia: SBCS, Núcleo Regional Centro-Oeste, 2016. FertBio 2016.$c2016
653 $aMobilidade
653 $aOrganomineral
653 $aP disponível
700 1 $aMATTOS, B. B.
700 1 $aSOUZA, F. H. de
700 1 $aSANTOS, D. N. dos
700 1 $aBENITES, V. de M.
700 1 $aTEIXEIRA, P. C.
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