Tuning rheology and aggregation behaviour of TEMPO-oxidised cellulose nanofibrils aqueous suspensions by addition of different acids

Detalhes bibliográficos
Autor(a) principal: Alves, L.
Data de Publicação: 2020
Outros Autores: Ferraz, Eduardo, Lourenço, A. F., Ferreira, P. J., Rasteiro, M. G., Gamelas, J. A. F.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10400.26/38421
Resumo: The present work intends to study the variations in the rheological properties and aggregation behaviour of TEMPO-oxidised cellulose nanofibrils (CNF) aqueous suspensions, as a function of changes in concentration and systematic changes in the pH, by addition of acids with different anions. It was found that CNF suspensions form strong gels at mass fractions higher than 0.35 % and the gel point is ca. 0.18 %. On the other hand, aggregation is enhanced at acidic pH conditions due to lower charge repulsion among fibrils, leading to an increase of the suspension viscosity. However, distinct rheological behaviours were presented by CNF suspensions as different acids were applied. It was found that phosphate ions resulted in significant aggregation leading to formation of particles of large size and very strong gels, at pH 2.3; distinctly, the presence of acetate ions resulted in lower aggregation, lower particle size and weaker gels, at the same pH value.
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spelling Tuning rheology and aggregation behaviour of TEMPO-oxidised cellulose nanofibrils aqueous suspensions by addition of different acidsCellulose nanofibrilsCharged nanofibrilsRheological propertiesHydrogelsAggregationAcidsProtonationHofmeister seriesThe present work intends to study the variations in the rheological properties and aggregation behaviour of TEMPO-oxidised cellulose nanofibrils (CNF) aqueous suspensions, as a function of changes in concentration and systematic changes in the pH, by addition of acids with different anions. It was found that CNF suspensions form strong gels at mass fractions higher than 0.35 % and the gel point is ca. 0.18 %. On the other hand, aggregation is enhanced at acidic pH conditions due to lower charge repulsion among fibrils, leading to an increase of the suspension viscosity. However, distinct rheological behaviours were presented by CNF suspensions as different acids were applied. It was found that phosphate ions resulted in significant aggregation leading to formation of particles of large size and very strong gels, at pH 2.3; distinctly, the presence of acetate ions resulted in lower aggregation, lower particle size and weaker gels, at the same pH value.The present research was supported by the R&D Project “FILCNF- New generation of composite films of cellulose nanofibrils with mineral particles as high strength materials with gas barrier properties” (PTDC/QUI-OUT/31884/2017, CENTRO 01-0145-FEDER-031884) and Strategic Research Centre Project,UIDB00102/2020, both funded by the Fundação para a Ciência e Tecnologia (FCT). A. F. Lourenço also acknowledges Fundação para a Ciência e Tecnologia for the PhD grant (SFRH/BDE /108095/2015).CENTRO-01-0145-FEDER-031884Repositório ComumAlves, L.Ferraz, EduardoLourenço, A. F.Ferreira, P. J.Rasteiro, M. G.Gamelas, J. A. F.2021-12-22T23:31:27Z2020-06-012021-12-22T19:40:35Z2020-06-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.26/38421eng0144-8617cv-prod-138815210.1016/j.carbpol.2020.116109metadata only accessinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-10-20T10:52:48Zoai:comum.rcaap.pt:10400.26/38421Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T20:37:15.626698Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Tuning rheology and aggregation behaviour of TEMPO-oxidised cellulose nanofibrils aqueous suspensions by addition of different acids
title Tuning rheology and aggregation behaviour of TEMPO-oxidised cellulose nanofibrils aqueous suspensions by addition of different acids
spellingShingle Tuning rheology and aggregation behaviour of TEMPO-oxidised cellulose nanofibrils aqueous suspensions by addition of different acids
Alves, L.
Cellulose nanofibrils
Charged nanofibrils
Rheological properties
Hydrogels
Aggregation
Acids
Protonation
Hofmeister series
title_short Tuning rheology and aggregation behaviour of TEMPO-oxidised cellulose nanofibrils aqueous suspensions by addition of different acids
title_full Tuning rheology and aggregation behaviour of TEMPO-oxidised cellulose nanofibrils aqueous suspensions by addition of different acids
title_fullStr Tuning rheology and aggregation behaviour of TEMPO-oxidised cellulose nanofibrils aqueous suspensions by addition of different acids
title_full_unstemmed Tuning rheology and aggregation behaviour of TEMPO-oxidised cellulose nanofibrils aqueous suspensions by addition of different acids
title_sort Tuning rheology and aggregation behaviour of TEMPO-oxidised cellulose nanofibrils aqueous suspensions by addition of different acids
author Alves, L.
author_facet Alves, L.
Ferraz, Eduardo
Lourenço, A. F.
Ferreira, P. J.
Rasteiro, M. G.
Gamelas, J. A. F.
author_role author
author2 Ferraz, Eduardo
Lourenço, A. F.
Ferreira, P. J.
Rasteiro, M. G.
Gamelas, J. A. F.
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv Repositório Comum
dc.contributor.author.fl_str_mv Alves, L.
Ferraz, Eduardo
Lourenço, A. F.
Ferreira, P. J.
Rasteiro, M. G.
Gamelas, J. A. F.
dc.subject.por.fl_str_mv Cellulose nanofibrils
Charged nanofibrils
Rheological properties
Hydrogels
Aggregation
Acids
Protonation
Hofmeister series
topic Cellulose nanofibrils
Charged nanofibrils
Rheological properties
Hydrogels
Aggregation
Acids
Protonation
Hofmeister series
description The present work intends to study the variations in the rheological properties and aggregation behaviour of TEMPO-oxidised cellulose nanofibrils (CNF) aqueous suspensions, as a function of changes in concentration and systematic changes in the pH, by addition of acids with different anions. It was found that CNF suspensions form strong gels at mass fractions higher than 0.35 % and the gel point is ca. 0.18 %. On the other hand, aggregation is enhanced at acidic pH conditions due to lower charge repulsion among fibrils, leading to an increase of the suspension viscosity. However, distinct rheological behaviours were presented by CNF suspensions as different acids were applied. It was found that phosphate ions resulted in significant aggregation leading to formation of particles of large size and very strong gels, at pH 2.3; distinctly, the presence of acetate ions resulted in lower aggregation, lower particle size and weaker gels, at the same pH value.
publishDate 2020
dc.date.none.fl_str_mv 2020-06-01
2020-06-01T00:00:00Z
2021-12-22T23:31:27Z
2021-12-22T19:40:35Z
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cv-prod-1388152
10.1016/j.carbpol.2020.116109
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collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
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