Understanding the influence of carbon nanotubes on the flow behavior of liquid crystalline hydroxypropylcellulose: a Rheo-NMR study
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Outros Autores: | , , |
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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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 info:eu-repo/semantics/openAccess |
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metadata only access |
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 |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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