Tetramethylguanidine-based gels and colloids of cellulose

Detalhes bibliográficos
Autor(a) principal: Carrera, Gonçalo V.S.M.
Data de Publicação: 2017
Outros Autores: Raymundo, Anabela, Fernandes, Francisco M. Braz, Jordão, Noemi, Sousa, Isabel, Ponte, Manuel Nunes, Branco, Luís C.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10400.5/16393
Resumo: Novel and stable gels of cellulose were produced. These gels are prepared at room temperature by com-bination of cellulose and tetramethylguanidine (TMG) in different ratios (1:1, 1:2, 1:3 in equivalents ofalcohol groups of cellulose per number of molecules of TMG). Detailed NMR, SEM, rheological and XRDstudies of these gels were carried out. The concentration of cellulose in the gel, temperature, frequency ofoscillation and shear rate were used as variables in order to understand the fundamentals and optimizeoperational conditions, considering their possible use as matrices for CO2capture. Cellulose recoveryfrom a specific gel was performed using ethanol as precipitating agent, leading to a lower crystallinity,which permits to consider this polymer in further studies associated to physical/chemical modificationof cellulose
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spelling Tetramethylguanidine-based gels and colloids of cellulosecellulosegelscolloidsNMRrheologymolecular interactionsNovel and stable gels of cellulose were produced. These gels are prepared at room temperature by com-bination of cellulose and tetramethylguanidine (TMG) in different ratios (1:1, 1:2, 1:3 in equivalents ofalcohol groups of cellulose per number of molecules of TMG). Detailed NMR, SEM, rheological and XRDstudies of these gels were carried out. The concentration of cellulose in the gel, temperature, frequency ofoscillation and shear rate were used as variables in order to understand the fundamentals and optimizeoperational conditions, considering their possible use as matrices for CO2capture. Cellulose recoveryfrom a specific gel was performed using ethanol as precipitating agent, leading to a lower crystallinity,which permits to consider this polymer in further studies associated to physical/chemical modificationof celluloseElsevierRepositório da Universidade de LisboaCarrera, Gonçalo V.S.M.Raymundo, AnabelaFernandes, Francisco M. BrazJordão, NoemiSousa, IsabelPonte, Manuel NunesBranco, Luís C.2018-11-26T12:09:23Z20172017-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.5/16393engCarbohydrate Polymers 169 (2017) 58–64http://dx.doi.org/10.1016/j.carbpol.2017.03.084info: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:RCAAP2023-03-06T14:46:12Zoai:www.repository.utl.pt:10400.5/16393Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T17:01:48.547153Repositório 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 Tetramethylguanidine-based gels and colloids of cellulose
title Tetramethylguanidine-based gels and colloids of cellulose
spellingShingle Tetramethylguanidine-based gels and colloids of cellulose
Carrera, Gonçalo V.S.M.
cellulose
gels
colloids
NMR
rheology
molecular interactions
title_short Tetramethylguanidine-based gels and colloids of cellulose
title_full Tetramethylguanidine-based gels and colloids of cellulose
title_fullStr Tetramethylguanidine-based gels and colloids of cellulose
title_full_unstemmed Tetramethylguanidine-based gels and colloids of cellulose
title_sort Tetramethylguanidine-based gels and colloids of cellulose
author Carrera, Gonçalo V.S.M.
author_facet Carrera, Gonçalo V.S.M.
Raymundo, Anabela
Fernandes, Francisco M. Braz
Jordão, Noemi
Sousa, Isabel
Ponte, Manuel Nunes
Branco, Luís C.
author_role author
author2 Raymundo, Anabela
Fernandes, Francisco M. Braz
Jordão, Noemi
Sousa, Isabel
Ponte, Manuel Nunes
Branco, Luís C.
author2_role author
author
author
author
author
author
dc.contributor.none.fl_str_mv Repositório da Universidade de Lisboa
dc.contributor.author.fl_str_mv Carrera, Gonçalo V.S.M.
Raymundo, Anabela
Fernandes, Francisco M. Braz
Jordão, Noemi
Sousa, Isabel
Ponte, Manuel Nunes
Branco, Luís C.
dc.subject.por.fl_str_mv cellulose
gels
colloids
NMR
rheology
molecular interactions
topic cellulose
gels
colloids
NMR
rheology
molecular interactions
description Novel and stable gels of cellulose were produced. These gels are prepared at room temperature by com-bination of cellulose and tetramethylguanidine (TMG) in different ratios (1:1, 1:2, 1:3 in equivalents ofalcohol groups of cellulose per number of molecules of TMG). Detailed NMR, SEM, rheological and XRDstudies of these gels were carried out. The concentration of cellulose in the gel, temperature, frequency ofoscillation and shear rate were used as variables in order to understand the fundamentals and optimizeoperational conditions, considering their possible use as matrices for CO2capture. Cellulose recoveryfrom a specific gel was performed using ethanol as precipitating agent, leading to a lower crystallinity,which permits to consider this polymer in further studies associated to physical/chemical modificationof cellulose
publishDate 2017
dc.date.none.fl_str_mv 2017
2017-01-01T00:00:00Z
2018-11-26T12:09:23Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10400.5/16393
url http://hdl.handle.net/10400.5/16393
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Carbohydrate Polymers 169 (2017) 58–64
http://dx.doi.org/10.1016/j.carbpol.2017.03.084
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
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