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Registro Completo |
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Biblioteca(s): |
Embrapa Florestas. |
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Data corrente: |
06/09/2017 |
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Data da última atualização: |
05/01/2018 |
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Tipo da produção científica: |
Artigo em Anais de Congresso |
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Autoria: |
CLARO, F. C.; MATOS, M. de; MAGALHAES, W. L. E. |
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Afiliação: |
Francine C. Claro, UFPR; Mailson de Matos, Estudantes PHD, UFPR; WASHINGTON LUIZ ESTEVES MAGALHAES, CNPF. |
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Título: |
Effect of the hemicellulose in the properties of nanopaper. |
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Ano de publicação: |
2017 |
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Fonte/Imprenta: |
In: INTERNATIONAL SYMPOSIUM ON WOOD, FIBRE AND PULPING CHEMISTRY, 19., 2017, Porto Seguro. Proceedings. Viçosa, MG: UFV, 2017. |
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Páginas: |
p. 393-397. |
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Idioma: |
Inglês |
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Conteúdo: |
The foldable, low thermal expansion, and optically transparent are main properties of paper produced with cellulose nanofibers (nanopaper), being able to be used ifl the development of flexible circuit technologies. In this context, this work evaluates the importance of hemicellulose in the properties of nanofiber paper (NFP). The hemicellulose extraction from Pinus sp bleached cellulose pulp was performed with NaOH 17.5% for 1.5 h. Thereafter, the pulp was washed with 8.3% NaOH, then was add 10% acetic acid until neutralization, and washed with water. The nanofibrils were obtained by mechanical defibrillation in a Super Masscoloider Masuko Sangyo mill. The NFP with the grammage of 40 and 50 g/m2 were produced by filtration and drying under pressure. The extraction process reduced 80% of xylose, 40% of mannose and 40% of galactose compared of the bleached cellulosic pulp. The NFPs with around 15% of hemicellulose are homogeneous and transparent, the interstices between the fibers, observed by scanning electron microscopy, are small enough to avoid light scattering, making the cellulosic material transparent. The NFP of 40 and 50 g/m2 had a thickness of 45 J..Im,water absorption of 63 and 34 g/m2, respectively. They did not present air permeability. NFP of 40 and 50 g/m2 without hemicellulose had a thickness of 76 and 87 um, water absorption of 128 g/m2 and air permeability of 202 and 384 s/100 em", respectively. The spaces created by the coalescence of the cellulose nanofibrils after the extraction of the hemicellulose result in the dispersion of the light and consequently in the opacity of the NFP. Extraction of hemicellulose reduced the tensile and bursting strength by 80%. Therefore, hemicellulose acts as an inhibitor of the coalescence of microfibrils, providing adhesion and increase of the mechanical properties. MenosThe foldable, low thermal expansion, and optically transparent are main properties of paper produced with cellulose nanofibers (nanopaper), being able to be used ifl the development of flexible circuit technologies. In this context, this work evaluates the importance of hemicellulose in the properties of nanofiber paper (NFP). The hemicellulose extraction from Pinus sp bleached cellulose pulp was performed with NaOH 17.5% for 1.5 h. Thereafter, the pulp was washed with 8.3% NaOH, then was add 10% acetic acid until neutralization, and washed with water. The nanofibrils were obtained by mechanical defibrillation in a Super Masscoloider Masuko Sangyo mill. The NFP with the grammage of 40 and 50 g/m2 were produced by filtration and drying under pressure. The extraction process reduced 80% of xylose, 40% of mannose and 40% of galactose compared of the bleached cellulosic pulp. The NFPs with around 15% of hemicellulose are homogeneous and transparent, the interstices between the fibers, observed by scanning electron microscopy, are small enough to avoid light scattering, making the cellulosic material transparent. The NFP of 40 and 50 g/m2 had a thickness of 45 J..Im,water absorption of 63 and 34 g/m2, respectively. They did not present air permeability. NFP of 40 and 50 g/m2 without hemicellulose had a thickness of 76 and 87 um, water absorption of 128 g/m2 and air permeability of 202 and 384 s/100 em", respectively. The spaces created by the coalescence of the cellulose nanofibr... Mostrar Tudo |
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Palavras-Chave: |
Air permeability; Bleached pulp; Nanofibra; Permeabilidade do ar. |
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Thesagro: |
Hemicelulose. |
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Thesaurus Nal: |
Hemicellulose; Nanofibers; Tensile strength. |
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Categoria do assunto: |
X Pesquisa, Tecnologia e Engenharia |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/163592/1/2017-Washington-ISWFPC-Effect.pdf
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Marc: |
LEADER 02596nam a2200241 a 4500
001 2075217
005 2018-01-05
008 2017 bl uuuu u00u1 u #d
100 1 $aCLARO, F. C.
245 $aEffect of the hemicellulose in the properties of nanopaper.$h[electronic resource]
260 $aIn: INTERNATIONAL SYMPOSIUM ON WOOD, FIBRE AND PULPING CHEMISTRY, 19., 2017, Porto Seguro. Proceedings. Viçosa, MG: UFV$c2017
300 $ap. 393-397.
520 $aThe foldable, low thermal expansion, and optically transparent are main properties of paper produced with cellulose nanofibers (nanopaper), being able to be used ifl the development of flexible circuit technologies. In this context, this work evaluates the importance of hemicellulose in the properties of nanofiber paper (NFP). The hemicellulose extraction from Pinus sp bleached cellulose pulp was performed with NaOH 17.5% for 1.5 h. Thereafter, the pulp was washed with 8.3% NaOH, then was add 10% acetic acid until neutralization, and washed with water. The nanofibrils were obtained by mechanical defibrillation in a Super Masscoloider Masuko Sangyo mill. The NFP with the grammage of 40 and 50 g/m2 were produced by filtration and drying under pressure. The extraction process reduced 80% of xylose, 40% of mannose and 40% of galactose compared of the bleached cellulosic pulp. The NFPs with around 15% of hemicellulose are homogeneous and transparent, the interstices between the fibers, observed by scanning electron microscopy, are small enough to avoid light scattering, making the cellulosic material transparent. The NFP of 40 and 50 g/m2 had a thickness of 45 J..Im,water absorption of 63 and 34 g/m2, respectively. They did not present air permeability. NFP of 40 and 50 g/m2 without hemicellulose had a thickness of 76 and 87 um, water absorption of 128 g/m2 and air permeability of 202 and 384 s/100 em", respectively. The spaces created by the coalescence of the cellulose nanofibrils after the extraction of the hemicellulose result in the dispersion of the light and consequently in the opacity of the NFP. Extraction of hemicellulose reduced the tensile and bursting strength by 80%. Therefore, hemicellulose acts as an inhibitor of the coalescence of microfibrils, providing adhesion and increase of the mechanical properties.
650 $aHemicellulose
650 $aNanofibers
650 $aTensile strength
650 $aHemicelulose
653 $aAir permeability
653 $aBleached pulp
653 $aNanofibra
653 $aPermeabilidade do ar
700 1 $aMATOS, M. de
700 1 $aMAGALHAES, W. L. E.
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Registro original: |
Embrapa Florestas (CNPF) |
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Registro Completo
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
03/12/2013 |
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Data da última atualização: |
17/05/2022 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Autoria: |
OLIVEIRA, M. E. F.; AYRES, H.; BARROS, F. F. P. C.; LIMA, M. R.; FELICIANO, M. A. R.; OLIVEIRA, L. G.; FONSECA, J. F. da; VICENTE, W. R. R. |
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Afiliação: |
JEFERSON FERREIRA DA FONSECA, CNPC. |
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Título: |
Efficiency of superovulatory treatment started near the time of emergency of the first of last follicular waves of progesterone protocol in Santa Inês ewes non-breeding season. |
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Ano de publicação: |
2013 |
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Fonte/Imprenta: |
Animal Reproduction, v. 10, n. 3, p. 420, Jul./Sept. 2013. |
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Idioma: |
Inglês |
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Notas: |
Annual Meeting of The Brazilian Embryo Technology Society - SBTE, 27., 2013, Praia do Forte, BA, Brasil. |
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Palavras-Chave: |
Emergencia folicular; Onda folicular; Raça Santa Inês. |
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Thesagro: |
Endocrinologia; Hormônio; Ovino; Progesterona; Reprodução animal; Superovulação. |
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Thesaurus NAL: |
endocrinology; Hormones; Progesterone; Reproduction; Sheep; Superovulation. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/93468/1/rac-Efficiency-of-superovulatory.pdf
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Marc: |
LEADER 01246nam a2200373 a 4500
001 1972813
005 2022-05-17
008 2013 bl uuuu u00u1 u #d
100 1 $aOLIVEIRA, M. E. F.
245 $aEfficiency of superovulatory treatment started near the time of emergency of the first of last follicular waves of progesterone protocol in Santa Inês ewes non-breeding season.$h[electronic resource]
260 $aAnimal Reproduction, v. 10, n. 3, p. 420, Jul./Sept. 2013.$c2013
500 $aAnnual Meeting of The Brazilian Embryo Technology Society - SBTE, 27., 2013, Praia do Forte, BA, Brasil.
650 $aendocrinology
650 $aHormones
650 $aProgesterone
650 $aReproduction
650 $aSheep
650 $aSuperovulation
650 $aEndocrinologia
650 $aHormônio
650 $aOvino
650 $aProgesterona
650 $aReprodução animal
650 $aSuperovulação
653 $aEmergencia folicular
653 $aOnda folicular
653 $aRaça Santa Inês
700 1 $aAYRES, H.
700 1 $aBARROS, F. F. P. C.
700 1 $aLIMA, M. R.
700 1 $aFELICIANO, M. A. R.
700 1 $aOLIVEIRA, L. G.
700 1 $aFONSECA, J. F. da
700 1 $aVICENTE, W. R. R.
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Embrapa Caprinos e Ovinos (CNPC) |
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