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 | Acesso ao texto completo restrito à biblioteca da Embrapa Florestas. Para informações adicionais entre em contato com cnpf.biblioteca@embrapa.br. |
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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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