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7. | ![Imagem marcado/desmarcado](/consulta/web/img/desmarcado.png) | NASCIMENTO, M. T.; VILLELA, D. M.; LACERDA, L. D. de. Foliar growth, longevity and herbivory in two "cerrado" species near Cuiaba, MT, Brazil. Revista Brasileira de Botanica, Sao Paulo, v.13, p.27-32, 1990. Biblioteca(s): Embrapa Cerrados. |
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12. | ![Imagem marcado/desmarcado](/consulta/web/img/desmarcado.png) | RIBEIRO, R. A. P.; LÁZARO, S. R.; LACERDA, L. H. S.; RIBEIRO, C. Investigação teórica sobre as propriedades eletrônicas do TiO2 dopado com nitrogênio na fase anatase. In: WORKSHOP DA REDE DE NANOTECNOLOGIA APLICADA AO AGRONEGÓCIO, 7.; ESCOLA DE NANOTECNOLOGIA, 3., 2013, São Carlos, SP. Anais... São Carlos, SP: Embrapa Instrumentação, 2013. p. 401-403 Editores: Maria Alice Martins, Odílio Benedito Garrido de Assis, Caue Ribeiro, Luiz Henrique Capparelli Mattoso. CD-ROM. Editores: Maria Alice Martins, Odílio Benedito Garrido de Assis, Caue Ribeiro, Luiz Henrique Capparelli Mattoso. Biblioteca(s): Embrapa Instrumentação. |
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15. | ![Imagem marcado/desmarcado](/consulta/web/img/desmarcado.png) | RIBEIRO, L. S.; CORDOBA, L. P.; LACERDA, L. G.; LAZZAROTTO, M.; SCHNITZLER, E. Caracterização de amido de pinhão modificado com soluções de ácido clorídrico 0,1 e 0,2M em presença de etanol e metanol. In: CONGRESSO BRASILEIRO DE ANÁLISE TÉRMICA E CALORIMETRIA, 9., 2014, Serra Negra. Trabalhos. [S.l.]: ABRATEC, 2014. 6 p. Disponibilizado online. CBRATEC. Biblioteca(s): Embrapa Florestas. |
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19. | ![Imagem marcado/desmarcado](/consulta/web/img/desmarcado.png) | HACON, S.; ROCHEDO, E. R.; CAMPOS, R.; ROSALES, G.; LACERDA, L. D. Risk assessment of mercury in Alta Floresta. Amazon Basin - Brazil. Water, Air & Soil Pollution, v.97, n.1/2, p.91-105, 1997. Biblioteca(s): Embrapa Pantanal. |
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![](/consulta/web/img/deny.png) | Acesso ao texto completo restrito à biblioteca da Embrapa Florestas. Para informações adicionais entre em contato com cnpf.biblioteca@embrapa.br. |
Registro Completo
Biblioteca(s): |
Embrapa Florestas. |
Data corrente: |
09/11/2018 |
Data da última atualização: |
26/07/2019 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Circulação/Nível: |
A - 1 |
Autoria: |
MALUCELLI, L. C.; MATOS, M. de; JORDÃO, C.; LACERDA, L. G.; CARVALHO FILHO, M. A. S.; MAGALHAES, W. L. E. |
Afiliação: |
LUCCA C. Malucelli, Graduate Program in Environmental Management, Universidade Positivo; Mailson de Matos, Graduate Program in Materials and Science Engineering (PIPE), UFPR; Caroline Jordão, Graduate Program in Materials and Science Engineering (PIPE), UFPR; L. G. Lacerda, Graduate Program in Food Engineering, UEPG; M. A. S. Carvalho Filho, Graduate Program in Environmental Management, Universidade Positivo; WASHINGTON LUIZ ESTEVES MAGALHAES, CNPF. |
Título: |
Grinding severity influences the viscosity of cellulose nanofiber (CNF) suspensions and mechanical properties of nanopaper. |
Ano de publicação: |
2018 |
Fonte/Imprenta: |
Cellulose, v. 25, n. 11, p. 6581-6589, Nov. 2018. |
DOI: |
10.1007/s10570-018-2031-9 |
Idioma: |
Inglês |
Conteúdo: |
The extent of influence of ultrafine grinding on thermal, structural and rheological properties of cellulose nanofibers and mechanical properties of nanopaper was studied. Bleached Eucalyptus Pulp was used as a raw material for nanocellulose preparation where samples were collected every 5 passages (5, 10, 15, 20 and 25 passages) for analysis. TGA curves suggest thermal stability is decreased after 15 passages as surface area increased in homogenized samples. Moreover, intense defibrillation anticipated thermal degradation and gradually reduced cellulose degradation enthalpy in samples, as evidenced by TGA and DSC curves, thus suggesting fibers size reduction. The XRD crystallinity index does not vary with increased grinding. Finally, suspensions viscosity and nanopaper density showed strong influence over the mechanical properties of nanopapers as evidenced by DMA characterization. Increase in defibrillation resulted in fibers with enhanced tensile strain, toughness, and elastic modulus. However, fiber over-grinding affected this improvement, probably reducing electrostatic repulsion between fibers and resulting in less dense nanopapers. |
Palavras-Chave: |
Defibrillation; Dynamic mechanical analysis; Microfibrilação; Microfibrillation; Nanocellulose; Nanocelulose. |
Thesagro: |
Viscosidade. |
Thesaurus NAL: |
Viscosity. |
Categoria do assunto: |
X Pesquisa, Tecnologia e Engenharia |
Marc: |
LEADER 02046naa a2200289 a 4500 001 2099071 005 2019-07-26 008 2018 bl uuuu u00u1 u #d 024 7 $a10.1007/s10570-018-2031-9$2DOI 100 1 $aMALUCELLI, L. C. 245 $aGrinding severity influences the viscosity of cellulose nanofiber (CNF) suspensions and mechanical properties of nanopaper.$h[electronic resource] 260 $c2018 520 $aThe extent of influence of ultrafine grinding on thermal, structural and rheological properties of cellulose nanofibers and mechanical properties of nanopaper was studied. Bleached Eucalyptus Pulp was used as a raw material for nanocellulose preparation where samples were collected every 5 passages (5, 10, 15, 20 and 25 passages) for analysis. TGA curves suggest thermal stability is decreased after 15 passages as surface area increased in homogenized samples. Moreover, intense defibrillation anticipated thermal degradation and gradually reduced cellulose degradation enthalpy in samples, as evidenced by TGA and DSC curves, thus suggesting fibers size reduction. The XRD crystallinity index does not vary with increased grinding. Finally, suspensions viscosity and nanopaper density showed strong influence over the mechanical properties of nanopapers as evidenced by DMA characterization. Increase in defibrillation resulted in fibers with enhanced tensile strain, toughness, and elastic modulus. However, fiber over-grinding affected this improvement, probably reducing electrostatic repulsion between fibers and resulting in less dense nanopapers. 650 $aViscosity 650 $aViscosidade 653 $aDefibrillation 653 $aDynamic mechanical analysis 653 $aMicrofibrilação 653 $aMicrofibrillation 653 $aNanocellulose 653 $aNanocelulose 700 1 $aMATOS, M. de 700 1 $aJORDÃO, C. 700 1 $aLACERDA, L. G. 700 1 $aCARVALHO FILHO, M. A. S. 700 1 $aMAGALHAES, W. L. E. 773 $tCellulose$gv. 25, n. 11, p. 6581-6589, Nov. 2018.
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