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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: |
28/05/2019 |
Data da última atualização: |
30/10/2019 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
MALUCELLI, L. C.; MATOS, M. de; JORDÃO, C.; LOMONACO, D.; LACERDA, L. G.; CARVALHO FILHO, M. A. da S.; MAGALHAES, W. L. E. |
Afiliação: |
Lucca Centa Malucelli, Doutorando da Universidade Positivo; Mailson de Matos, Doutorando da UFPR; Caroline Jordão, Mestranda da UFPR; Diego Lomonaco, UFCE; Luiz Gustavo Lacerda, Pós-graduando da UEPG; Marco Aurélio da Silva Carvalho Filho, Universidade Positivo; WASHINGTON LUIZ ESTEVES MAGALHAES, CNPF. |
Título: |
Influence of cellulose chemical pretreatment on energy consumption and viscosity of produced cellulose nanofibers (CNF) and mechanical properties of nanopaper. |
Ano de publicação: |
2019 |
Fonte/Imprenta: |
Cellulose, v. 26, n. 3, p. 1667-1681, Feb. 2019. |
DOI: |
10.1007/s10570-018-2161-0 |
Idioma: |
Inglês |
Conteúdo: |
Lignocellulosic fibers are the main sources for producing nanocellulose, in which mechanical methods are the most appropriate to achieve a high yield and generate low residue. High energy consumption is the major drawback in these processes, although they are the cheapest way to produce nanocellulose. Chemical pretreatment is one approach to further decrease the overall cost during defibrillation; however, the influence over sample viscosity and mechanical properties is yet to be investigated. Here, we study the influence of chemical pretreatments using NaOH and 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) on the mechanical, rheological and structural properties of cellulose nanofibers made from bleached eucalyptus pulp. Modification of samples was evidenced by their respective peaks on FTIR spectra. Sample crystallinity increased after partial hemicellulose and amorphous cellulose removal. In addition, a strong correlation between grinding efficiency and lower energy consumption was observed. However, a mild alkaline treatment may improve fiber strength at the expense of suspension stability and energy consumption. Modified nanofibers presented good potential for enhancing mechanical properties and/or improving suspension stability. |
Palavras-Chave: |
Disintegration; Nanocellulose; Nanofibra; Pretreatments; Processing energy; TEMPO-oxidation. |
Thesagro: |
Alcalinidade; Hemicelulose; Viscosidade. |
Thesaurus Nal: |
Alkalinity; Hemicellulose; Nanofibers; Sodium hydroxide; Viscosity. |
Categoria do assunto: |
X Pesquisa, Tecnologia e Engenharia |
Marc: |
LEADER 02366naa a2200373 a 4500 001 2109354 005 2019-10-30 008 2019 bl uuuu u00u1 u #d 024 7 $a10.1007/s10570-018-2161-0$2DOI 100 1 $aMALUCELLI, L. C. 245 $aInfluence of cellulose chemical pretreatment on energy consumption and viscosity of produced cellulose nanofibers (CNF) and mechanical properties of nanopaper.$h[electronic resource] 260 $c2019 520 $aLignocellulosic fibers are the main sources for producing nanocellulose, in which mechanical methods are the most appropriate to achieve a high yield and generate low residue. High energy consumption is the major drawback in these processes, although they are the cheapest way to produce nanocellulose. Chemical pretreatment is one approach to further decrease the overall cost during defibrillation; however, the influence over sample viscosity and mechanical properties is yet to be investigated. Here, we study the influence of chemical pretreatments using NaOH and 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) on the mechanical, rheological and structural properties of cellulose nanofibers made from bleached eucalyptus pulp. Modification of samples was evidenced by their respective peaks on FTIR spectra. Sample crystallinity increased after partial hemicellulose and amorphous cellulose removal. In addition, a strong correlation between grinding efficiency and lower energy consumption was observed. However, a mild alkaline treatment may improve fiber strength at the expense of suspension stability and energy consumption. Modified nanofibers presented good potential for enhancing mechanical properties and/or improving suspension stability. 650 $aAlkalinity 650 $aHemicellulose 650 $aNanofibers 650 $aSodium hydroxide 650 $aViscosity 650 $aAlcalinidade 650 $aHemicelulose 650 $aViscosidade 653 $aDisintegration 653 $aNanocellulose 653 $aNanofibra 653 $aPretreatments 653 $aProcessing energy 653 $aTEMPO-oxidation 700 1 $aMATOS, M. de 700 1 $aJORDÃO, C. 700 1 $aLOMONACO, D. 700 1 $aLACERDA, L. G. 700 1 $aCARVALHO FILHO, M. A. da S. 700 1 $aMAGALHAES, W. L. E. 773 $tCellulose$gv. 26, n. 3, p. 1667-1681, Feb. 2019.
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Biblioteca(s): |
Embrapa Florestas. |
Data corrente: |
07/03/2016 |
Data da última atualização: |
07/03/2016 |
Tipo da produção científica: |
Resumo em Anais de Congresso |
Autoria: |
OLIVEIRA, Y. M. M. de; GARRASTAZU, M. C.; ROSOT, M. A. D.; LUZ, N. B. da; ABRANTES, M. A.; BOGNOLA, I. A.; FREITAS, J. V. de; MATTOS, P. P. de; VIBRANS, A. C.; FRANCISCON, L.; GOMIDE, G. |
Afiliação: |
YEDA MARIA MALHEIROS DE OLIVEIRA, CNPF; MARILICE CORDEIRO GARRASTAZU, CNPF; MARIA AUGUSTA DOETZER ROSOT, CNPF; Naíssa Batista da Luz, FAO; MARISTELA AVILA ABRANTES, CNPF; ITAMAR ANTONIO BOGNOLA, CNPF; Joberto Veloso de Freitas, Serviço Florestal; PATRICIA POVOA DE MATTOS, CNPF; Alexander Christian Vibrans, FURB; LUZIANE FRANCISCON, CNPF; Guilherme Gomide, Serviço Florestal. |
Título: |
Detection of Pinus sp. and Hovenia dulcis as invasive species in native forests of South Brazil using National Forest Inventory (NFI-BR) data. |
Ano de publicação: |
2015 |
Fonte/Imprenta: |
In: WORLD FORESTRY CONGRESS, 14., 2015, Durban. Forests and people: investing in a sustainable future. Roma: FAO, 2015. |
Descrição Física: |
Poster. |
Idioma: |
Inglês |
Palavras-Chave: |
Brasil; Espécie invasora; Inventário Florestal Nacional; National Forest Inventory; Pinus sp; Região Sul. |
Thesagro: |
Hovenia Dulcis. |
Thesaurus NAL: |
invasive species. |
Categoria do assunto: |
-- |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/140718/1/2015-Yeda-WFC-Detection.pdf
|
Marc: |
LEADER 01079nam a2200325 a 4500 001 2039837 005 2016-03-07 008 2015 bl uuuu u00u1 u #d 100 1 $aOLIVEIRA, Y. M. M. de 245 $aDetection of Pinus sp. and Hovenia dulcis as invasive species in native forests of South Brazil using National Forest Inventory (NFI-BR) data.$h[electronic resource] 260 $aIn: WORLD FORESTRY CONGRESS, 14., 2015, Durban. Forests and people: investing in a sustainable future. Roma: FAO$c2015 300 $cPoster. 650 $ainvasive species 650 $aHovenia Dulcis 653 $aBrasil 653 $aEspécie invasora 653 $aInventário Florestal Nacional 653 $aNational Forest Inventory 653 $aPinus sp 653 $aRegião Sul 700 1 $aGARRASTAZU, M. C. 700 1 $aROSOT, M. A. D. 700 1 $aLUZ, N. B. da 700 1 $aABRANTES, M. A. 700 1 $aBOGNOLA, I. A. 700 1 $aFREITAS, J. V. de 700 1 $aMATTOS, P. P. de 700 1 $aVIBRANS, A. C. 700 1 $aFRANCISCON, L. 700 1 $aGOMIDE, G.
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