Understanding the influence of carbon nanotubes on the flow behavior of liquid crystalline hydroxypropylcellulose: a Rheo-NMR study

Detalhes bibliográficos
Autor(a) principal: Echeverria Zabala, Coro
Data de Publicação: 2019
Outros Autores: Almeida, Pedro L., Figueirinhas, João, Godinho, Maria Helena
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10400.21/11454
Resumo: Hydroxypropyl celulose (HPC) is na importante celulose derivative that has been widely studied due to its water solubility, biocompatibility and biodegradability, but even more significant due to its ability to form liquid crystalline phases. HPC is able to form, under certain conditions, chiral nematic (cholesteric) structures in water solutions. Previous work confirmed that films prepared from liquid crystalline HPC/water solutions (LC-HPC) gave rise to anisotropic networks, with similar mechanical and optical characteristics of Liquid Crystalline Elastomers (LCE), capable to respond to humidity. It was also demonstrated that the incorporation of carbon nanotubes (CNTs) significantly improved the actuator responsiveness. In the work presented herein, we investigate how the incorporation of carbon nanotubes affects the flow behavior o fLC-HPC solutions, and thus the structure-properties relationship, through a detailed Rheo-NMR study. As observed from the results, when shearing the samples, the degree of order reached (maximum quadrupolar peak splitting) by LC-HPC solutions increases with CNT content. Regarding the subsequente relaxation process, only the incorporation of 0.01 wt% of CNTs (lowest content) contributes to a faster recovery of cholesteric structure.
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spelling Understanding the influence of carbon nanotubes on the flow behavior of liquid crystalline hydroxypropylcellulose: a Rheo-NMR studyCelluloseLC-HPCRheologyRheo-NMRCarbon nanotubesHydroxypropyl celulose (HPC) is na importante celulose derivative that has been widely studied due to its water solubility, biocompatibility and biodegradability, but even more significant due to its ability to form liquid crystalline phases. HPC is able to form, under certain conditions, chiral nematic (cholesteric) structures in water solutions. Previous work confirmed that films prepared from liquid crystalline HPC/water solutions (LC-HPC) gave rise to anisotropic networks, with similar mechanical and optical characteristics of Liquid Crystalline Elastomers (LCE), capable to respond to humidity. It was also demonstrated that the incorporation of carbon nanotubes (CNTs) significantly improved the actuator responsiveness. In the work presented herein, we investigate how the incorporation of carbon nanotubes affects the flow behavior o fLC-HPC solutions, and thus the structure-properties relationship, through a detailed Rheo-NMR study. As observed from the results, when shearing the samples, the degree of order reached (maximum quadrupolar peak splitting) by LC-HPC solutions increases with CNT content. Regarding the subsequente relaxation process, only the incorporation of 0.01 wt% of CNTs (lowest content) contributes to a faster recovery of cholesteric structure.ElsevierRCIPLEcheverria Zabala, CoroAlmeida, Pedro L.Figueirinhas, JoãoGodinho, Maria Helena2020-04-15T16:33:06Z2019-10-102019-10-10T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.21/11454engECHEVERRIA, Coro; [et al] – Understanding the influence of carbon nanotubes on the flow behavior of liquid crystalline hydroxypropylcellulose: a Rheo-NMR study. Polymer. ISSN 0032-3681. Vol. 180 (2019), pp. 1-100032-3681https://doi.org/10.1016/j.polymer.2019.121675metadata 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:RCAAP2023-08-03T10:02:43Zoai:repositorio.ipl.pt:10400.21/11454Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T20:19:42.313518Repositório 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 Understanding the influence of carbon nanotubes on the flow behavior of liquid crystalline hydroxypropylcellulose: a Rheo-NMR study
title Understanding the influence of carbon nanotubes on the flow behavior of liquid crystalline hydroxypropylcellulose: a Rheo-NMR study
spellingShingle Understanding the influence of carbon nanotubes on the flow behavior of liquid crystalline hydroxypropylcellulose: a Rheo-NMR study
Echeverria Zabala, Coro
Cellulose
LC-HPC
Rheology
Rheo-NMR
Carbon nanotubes
title_short Understanding the influence of carbon nanotubes on the flow behavior of liquid crystalline hydroxypropylcellulose: a Rheo-NMR study
title_full Understanding the influence of carbon nanotubes on the flow behavior of liquid crystalline hydroxypropylcellulose: a Rheo-NMR study
title_fullStr Understanding the influence of carbon nanotubes on the flow behavior of liquid crystalline hydroxypropylcellulose: a Rheo-NMR study
title_full_unstemmed Understanding the influence of carbon nanotubes on the flow behavior of liquid crystalline hydroxypropylcellulose: a Rheo-NMR study
title_sort Understanding the influence of carbon nanotubes on the flow behavior of liquid crystalline hydroxypropylcellulose: a Rheo-NMR study
author Echeverria Zabala, Coro
author_facet Echeverria Zabala, Coro
Almeida, Pedro L.
Figueirinhas, João
Godinho, Maria Helena
author_role author
author2 Almeida, Pedro L.
Figueirinhas, João
Godinho, Maria Helena
author2_role author
author
author
dc.contributor.none.fl_str_mv RCIPL
dc.contributor.author.fl_str_mv Echeverria Zabala, Coro
Almeida, Pedro L.
Figueirinhas, João
Godinho, Maria Helena
dc.subject.por.fl_str_mv Cellulose
LC-HPC
Rheology
Rheo-NMR
Carbon nanotubes
topic Cellulose
LC-HPC
Rheology
Rheo-NMR
Carbon nanotubes
description Hydroxypropyl celulose (HPC) is na importante celulose derivative that has been widely studied due to its water solubility, biocompatibility and biodegradability, but even more significant due to its ability to form liquid crystalline phases. HPC is able to form, under certain conditions, chiral nematic (cholesteric) structures in water solutions. Previous work confirmed that films prepared from liquid crystalline HPC/water solutions (LC-HPC) gave rise to anisotropic networks, with similar mechanical and optical characteristics of Liquid Crystalline Elastomers (LCE), capable to respond to humidity. It was also demonstrated that the incorporation of carbon nanotubes (CNTs) significantly improved the actuator responsiveness. In the work presented herein, we investigate how the incorporation of carbon nanotubes affects the flow behavior o fLC-HPC solutions, and thus the structure-properties relationship, through a detailed Rheo-NMR study. As observed from the results, when shearing the samples, the degree of order reached (maximum quadrupolar peak splitting) by LC-HPC solutions increases with CNT content. Regarding the subsequente relaxation process, only the incorporation of 0.01 wt% of CNTs (lowest content) contributes to a faster recovery of cholesteric structure.
publishDate 2019
dc.date.none.fl_str_mv 2019-10-10
2019-10-10T00:00:00Z
2020-04-15T16:33:06Z
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/10400.21/11454
url http://hdl.handle.net/10400.21/11454
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv ECHEVERRIA, Coro; [et al] – Understanding the influence of carbon nanotubes on the flow behavior of liquid crystalline hydroxypropylcellulose: a Rheo-NMR study. Polymer. ISSN 0032-3681. Vol. 180 (2019), pp. 1-10
0032-3681
https://doi.org/10.1016/j.polymer.2019.121675
dc.rights.driver.fl_str_mv metadata only access
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rights_invalid_str_mv metadata only access
eu_rights_str_mv openAccess
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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)
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instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
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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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