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Registro Completo |
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Biblioteca(s): |
Embrapa Florestas. |
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Data corrente: |
25/10/2011 |
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Data da última atualização: |
23/02/2015 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
MAGALHAES, W. L. E.; CAO, X.; RAMIRES, M. A.; LUCIA, L. A. |
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Afiliação: |
WASHINGTON LUIZ ESTEVES MAGALHAES, CNPF; XIAODONG CAO, South China University of Technology; MAGALY ALEXANDRA RAMIRES, North Carolina State University; LUCIAN A. LUCIA, North Carolina State University. |
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Título: |
Novel all-cellulose composite displaying aligned cellulose nanofibers reinforced with cellulose nanocrystals. |
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Ano de publicação: |
2011 |
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Fonte/Imprenta: |
Tappi Journal, v. 10, n. 4, p. 19-25, Apr. 2011. |
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Idioma: |
Inglês |
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Conteúdo: |
Aligned cellulose nanocrystals/cellulose coelectrospun nanofibers were successfully prepared by using a home-built coelectrospinning and collection system. Cellulose I was dissolved in N-methyl morpholine oxide at 120°C and diluted with dimethyl sulfoxide, which was used in the external concentric capillary needle as the sheath (shell) solution. A cellulose nanocrystal suspension obtained by sulfuric acid hydrolysis of cotton fibers was used as the core liquid in the internal concentric capillary needle after transferring from water to dimethyl sulfoxide. The resultant coelectrospun nanocomposite films were collected onto a rotating wire drum and were characterized by field emission scanning electron microscopy (FE-SEM), Fourier transform infrared spectroscopy, thermogravimet-ric analysis, and tensile measurements. The FE-SEM image showed that the cellulose nanocrystals did not appear to cluster in the film formed. Although the crystallinity index of nanocomposite fibers was lower than the unreinforced cellulose electrospun fibers, the cellulose type II reinforced with cellulose nanocrystals had a much higher tensile stress (about 140 MPa), almost twofold that of pure cellulose. This latter result indicated that the alignment and adhesion of amorphous cellulose nanofibers played a crucial role on the mechanical properties of electrospun cellu-losic fiber mats. |
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Palavras-Chave: |
Cellulose composite; Cellulose nanocrystal; Compósito; Electrospinning; Nanocristal de celulose; Nanofibra; Nanofibres. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02103naa a2200241 a 4500
001 1904061
005 2015-02-23
008 2011 bl uuuu u00u1 u #d
100 1 $aMAGALHAES, W. L. E.
245 $aNovel all-cellulose composite displaying aligned cellulose nanofibers reinforced with cellulose nanocrystals.$h[electronic resource]
260 $c2011
520 $aAligned cellulose nanocrystals/cellulose coelectrospun nanofibers were successfully prepared by using a home-built coelectrospinning and collection system. Cellulose I was dissolved in N-methyl morpholine oxide at 120°C and diluted with dimethyl sulfoxide, which was used in the external concentric capillary needle as the sheath (shell) solution. A cellulose nanocrystal suspension obtained by sulfuric acid hydrolysis of cotton fibers was used as the core liquid in the internal concentric capillary needle after transferring from water to dimethyl sulfoxide. The resultant coelectrospun nanocomposite films were collected onto a rotating wire drum and were characterized by field emission scanning electron microscopy (FE-SEM), Fourier transform infrared spectroscopy, thermogravimet-ric analysis, and tensile measurements. The FE-SEM image showed that the cellulose nanocrystals did not appear to cluster in the film formed. Although the crystallinity index of nanocomposite fibers was lower than the unreinforced cellulose electrospun fibers, the cellulose type II reinforced with cellulose nanocrystals had a much higher tensile stress (about 140 MPa), almost twofold that of pure cellulose. This latter result indicated that the alignment and adhesion of amorphous cellulose nanofibers played a crucial role on the mechanical properties of electrospun cellu-losic fiber mats.
653 $aCellulose composite
653 $aCellulose nanocrystal
653 $aCompósito
653 $aElectrospinning
653 $aNanocristal de celulose
653 $aNanofibra
653 $aNanofibres
700 1 $aCAO, X.
700 1 $aRAMIRES, M. A.
700 1 $aLUCIA, L. A.
773 $tTappi Journal$gv. 10, n. 4, p. 19-25, Apr. 2011.
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Embrapa Florestas (CNPF) |
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Biblioteca(s): |
Embrapa Roraima. |
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Data corrente: |
26/06/2017 |
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Data da última atualização: |
26/06/2017 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Autoria: |
BATISTA, J. S. R.; MORAIS, E. G. F. de; SPECHT, A.; SILVA, E. S.; SILVA JUNIOR, R. J. da. |
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Afiliação: |
ELISANGELA GOMES FIDELIS DE MORAIS, CPAF-Roraima; RINALDO JOAQUIM DA SILVA JUNIOR, CPAF-Roraima. |
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Título: |
Lagartas praga das famílias Noctuidae e Erebidae em cultivo de soja no Cerrado de Roraima. |
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Ano de publicação: |
2016 |
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Fonte/Imprenta: |
In: SEMANA NACIONAL DE CIÊNCIA E TECNOLOGIA NO ESTADO DE RORAIMA, 11., 2016, Boa Vista, RR. Resumos... Boa Vista, RR: UERR, 2016. |
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Idioma: |
Português |
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Thesagro: |
Praga Quarentenária. |
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Thesaurus NAL: |
Helicoverpa armigera. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/161063/1/ResumoHelicoverpa-id-4.pdf
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Marc: |
LEADER 00615nam a2200169 a 4500
001 2071520
005 2017-06-26
008 2016 bl uuuu u00u1 u #d
100 1 $aBATISTA, J. S. R.
245 $aLagartas praga das famílias Noctuidae e Erebidae em cultivo de soja no Cerrado de Roraima.
260 $aIn: SEMANA NACIONAL DE CIÊNCIA E TECNOLOGIA NO ESTADO DE RORAIMA, 11., 2016, Boa Vista, RR. Resumos... Boa Vista, RR: UERR$c2016
650 $aHelicoverpa armigera
650 $aPraga Quarentenária
700 1 $aMORAIS, E. G. F. de
700 1 $aSPECHT, A.
700 1 $aSILVA, E. S.
700 1 $aSILVA JUNIOR, R. J. da
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