Organic-inorganic hybrid sol-gel materials doped with a fluorescent triarylimidazole derivative
Autor(a) principal: | |
---|---|
Data de Publicação: | 2021 |
Outros Autores: | , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | https://hdl.handle.net/1822/78776 |
Resumo: | The development of sensors for pH monitoring is of extreme importance in the monitoring of concrete and reinforced concrete structures. Imidazole derivatives are promising probes for pH sensing due to the amphoteric nature of their heterocyclic ring, which can be protonated/deprotonated upon pH changes. In this work, a triarylimidazole was synthesised and used as a dopant in an organic-inorganic hybrid (OIH) sol-gel matrix to obtain a pH-sensitive membrane for further application in optical fibre sensors (OFS). The triarylimidazole probe shows fluorimetric response in pH between 9 and 13, which is the desired range for monitoring carbonation of concrete. This degradation process lowers the highly alkaline pH of concrete (12.5-13) to values below 9, which creates favourable conditions for corrosion of concrete reinforcement. The OIH membranes used were based on Jeffamine THF170 and 3-glycidoxypropytrimethoxysilane precursors, which had already been shown to be suitable and resistant in contact with cement-based materials. The OIHs were doped with three different contents of the triarylimidazole and the structural, dielectric, thermal and optical properties of the pure and doped OIH materials were evaluated. The structural analysis showed that the presence of the triarylimidazole did not change the structural properties of the OIH material. Electrochemical impedance spectroscopy showed that in the doped samples the conductivity increased with the imidazole concentration. Theεrobtained for the doped samples ranged approximately from 11 to 19 and for the pure matrices was 8. Thermal analysis showed that these materials are stable up to 350 °C and that the presence of the probe did not change that feature. The optical properties showed that the prepared OIH materials have promising properties to be used as pH sensitive fluorimetric probes. |
id |
RCAP_3afd2ef7c69a93cdb3e2e028ee104bfe |
---|---|
oai_identifier_str |
oai:repositorium.sdum.uminho.pt:1822/78776 |
network_acronym_str |
RCAP |
network_name_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository_id_str |
|
spelling |
Organic-inorganic hybrid sol-gel materials doped with a fluorescent triarylimidazole derivativeScience & TechnologyThe development of sensors for pH monitoring is of extreme importance in the monitoring of concrete and reinforced concrete structures. Imidazole derivatives are promising probes for pH sensing due to the amphoteric nature of their heterocyclic ring, which can be protonated/deprotonated upon pH changes. In this work, a triarylimidazole was synthesised and used as a dopant in an organic-inorganic hybrid (OIH) sol-gel matrix to obtain a pH-sensitive membrane for further application in optical fibre sensors (OFS). The triarylimidazole probe shows fluorimetric response in pH between 9 and 13, which is the desired range for monitoring carbonation of concrete. This degradation process lowers the highly alkaline pH of concrete (12.5-13) to values below 9, which creates favourable conditions for corrosion of concrete reinforcement. The OIH membranes used were based on Jeffamine THF170 and 3-glycidoxypropytrimethoxysilane precursors, which had already been shown to be suitable and resistant in contact with cement-based materials. The OIHs were doped with three different contents of the triarylimidazole and the structural, dielectric, thermal and optical properties of the pure and doped OIH materials were evaluated. The structural analysis showed that the presence of the triarylimidazole did not change the structural properties of the OIH material. Electrochemical impedance spectroscopy showed that in the doped samples the conductivity increased with the imidazole concentration. Theεrobtained for the doped samples ranged approximately from 11 to 19 and for the pure matrices was 8. Thermal analysis showed that these materials are stable up to 350 °C and that the presence of the probe did not change that feature. The optical properties showed that the prepared OIH materials have promising properties to be used as pH sensitive fluorimetric probes.FCT - Fundação para a Ciência e a Tecnologia(UIDB/04029/2020)Thanks are due to Fundação para a Ciência e Tecnologia (FCT) and FEDER (European Fund for Regional Development)- COMPETE-QRENEU for financial support through the Chemistry Research Centre of the University of Minho (Ref. CQ/UM (UID/QUI/00686/2019 and UID/QUI/00686/2020)), project “Sol-Sensors — Development of Advanced Fiber Optic Sensors for Monitoring the Durability of Concrete Structures” (www.solsensors.eu), reference POCI-01-0145-FEDER-031220, and a PhD grant to Rui P. C. L. Sousa (SFRH/BD/145639/ 2019). The NMR spectrometer Bruker Avance III 400 is part of the National NMR Network (PTNMR) and are partially supported by Infrastructure Project No 022161 (co-financed by FEDER through COMPETE 2020, POCI and PORL and FCT through PIDDAC). Thanks are also due to FCT/MCTES through national funds (PIDDAC) under the R&D Unit Institute for Sustainability and Innovation in Structural Engineering (ISISE), under reference UIDB/04029/2020.Royal Society of ChemistryUniversidade do MinhoSousa, Rui Pedro Romero AmandiFigueira, Rita BacelarGomes, Bárbara R.Costa, Susana P. G.Azenha, MiguelPereira, Rui Francisco Gonçalves Pinto FernandesRaposo, M. Manuela M.2021-07-022021-07-02T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/1822/78776eng2046-206910.1039/d1ra03997khttps://pubs.rsc.org/en/content/articlelanding/2021/ra/d1ra03997kinfo: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:RCAAP2023-07-21T12:33:20ZPortal AgregadorONG |
dc.title.none.fl_str_mv |
Organic-inorganic hybrid sol-gel materials doped with a fluorescent triarylimidazole derivative |
title |
Organic-inorganic hybrid sol-gel materials doped with a fluorescent triarylimidazole derivative |
spellingShingle |
Organic-inorganic hybrid sol-gel materials doped with a fluorescent triarylimidazole derivative Sousa, Rui Pedro Romero Amandi Science & Technology |
title_short |
Organic-inorganic hybrid sol-gel materials doped with a fluorescent triarylimidazole derivative |
title_full |
Organic-inorganic hybrid sol-gel materials doped with a fluorescent triarylimidazole derivative |
title_fullStr |
Organic-inorganic hybrid sol-gel materials doped with a fluorescent triarylimidazole derivative |
title_full_unstemmed |
Organic-inorganic hybrid sol-gel materials doped with a fluorescent triarylimidazole derivative |
title_sort |
Organic-inorganic hybrid sol-gel materials doped with a fluorescent triarylimidazole derivative |
author |
Sousa, Rui Pedro Romero Amandi |
author_facet |
Sousa, Rui Pedro Romero Amandi Figueira, Rita Bacelar Gomes, Bárbara R. Costa, Susana P. G. Azenha, Miguel Pereira, Rui Francisco Gonçalves Pinto Fernandes Raposo, M. Manuela M. |
author_role |
author |
author2 |
Figueira, Rita Bacelar Gomes, Bárbara R. Costa, Susana P. G. Azenha, Miguel Pereira, Rui Francisco Gonçalves Pinto Fernandes Raposo, M. Manuela M. |
author2_role |
author author author author author author |
dc.contributor.none.fl_str_mv |
Universidade do Minho |
dc.contributor.author.fl_str_mv |
Sousa, Rui Pedro Romero Amandi Figueira, Rita Bacelar Gomes, Bárbara R. Costa, Susana P. G. Azenha, Miguel Pereira, Rui Francisco Gonçalves Pinto Fernandes Raposo, M. Manuela M. |
dc.subject.por.fl_str_mv |
Science & Technology |
topic |
Science & Technology |
description |
The development of sensors for pH monitoring is of extreme importance in the monitoring of concrete and reinforced concrete structures. Imidazole derivatives are promising probes for pH sensing due to the amphoteric nature of their heterocyclic ring, which can be protonated/deprotonated upon pH changes. In this work, a triarylimidazole was synthesised and used as a dopant in an organic-inorganic hybrid (OIH) sol-gel matrix to obtain a pH-sensitive membrane for further application in optical fibre sensors (OFS). The triarylimidazole probe shows fluorimetric response in pH between 9 and 13, which is the desired range for monitoring carbonation of concrete. This degradation process lowers the highly alkaline pH of concrete (12.5-13) to values below 9, which creates favourable conditions for corrosion of concrete reinforcement. The OIH membranes used were based on Jeffamine THF170 and 3-glycidoxypropytrimethoxysilane precursors, which had already been shown to be suitable and resistant in contact with cement-based materials. The OIHs were doped with three different contents of the triarylimidazole and the structural, dielectric, thermal and optical properties of the pure and doped OIH materials were evaluated. The structural analysis showed that the presence of the triarylimidazole did not change the structural properties of the OIH material. Electrochemical impedance spectroscopy showed that in the doped samples the conductivity increased with the imidazole concentration. Theεrobtained for the doped samples ranged approximately from 11 to 19 and for the pure matrices was 8. Thermal analysis showed that these materials are stable up to 350 °C and that the presence of the probe did not change that feature. The optical properties showed that the prepared OIH materials have promising properties to be used as pH sensitive fluorimetric probes. |
publishDate |
2021 |
dc.date.none.fl_str_mv |
2021-07-02 2021-07-02T00:00:00Z |
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 |
https://hdl.handle.net/1822/78776 |
url |
https://hdl.handle.net/1822/78776 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
2046-2069 10.1039/d1ra03997k https://pubs.rsc.org/en/content/articlelanding/2021/ra/d1ra03997k |
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 |
Royal Society of Chemistry |
publisher.none.fl_str_mv |
Royal Society of Chemistry |
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 |
|
repository.mail.fl_str_mv |
|
_version_ |
1777303785534652416 |