Spectroscopic and structural studies of di-ureasils doped with lithium perchlorate
Autor(a) principal: | |
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Data de Publicação: | 2007 |
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/1822/7752 |
Resumo: | Di-urea cross-linked POE/siloxane hybrid ormolytes (di-ureasils) doped with a wide concentration range of lithium perchlorate trihydrate (LiClO4·3H2O) (200 ≥ n ≥ 0.5, where n expresses the salt content in terms of the number of ether oxygen atoms per Li+ ion) have been analysed by Fourier transform infrared and Raman (FT-IR and FT-Raman, respectively) spectroscopies and X-ray diffraction (XRD). The results obtained lead us to conclude that the xerogels with n ≥ 5 are totally amorphous. At n ≤ 1 free salt is observed. “Free” ClO4− ions appear to be the main charge carriers at the conductivity maximum located within the 25 ≤ n ≤ 8 composition range of this family of ormolytes. At n = 15 ClO4− ions coordinated in mono/tridentate (C3v symmetry) and bidentate (C2v symmetry) configurations were detected. In salt-rich samples with n < 15 there is a marked tendency for ionic association. The resulting decrease that occurs in the concentration of “free” ions is consistent with the observed significant decrease of the ionic conductivity. The analysis of the “amide I” and “amide II” regions provided solid proof that the Li+ ions bond to the urea carbonyl oxygen atoms over the entire range of salt concentration studied. |
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Spectroscopic and structural studies of di-ureasils doped with lithium perchlorateSolid polymer electrolyteSol-gel processDi-ureasilsFT-IRFT-Ramansolid polymer electrolytesFT-lRFF-RamanScience & TechnologyDi-urea cross-linked POE/siloxane hybrid ormolytes (di-ureasils) doped with a wide concentration range of lithium perchlorate trihydrate (LiClO4·3H2O) (200 ≥ n ≥ 0.5, where n expresses the salt content in terms of the number of ether oxygen atoms per Li+ ion) have been analysed by Fourier transform infrared and Raman (FT-IR and FT-Raman, respectively) spectroscopies and X-ray diffraction (XRD). The results obtained lead us to conclude that the xerogels with n ≥ 5 are totally amorphous. At n ≤ 1 free salt is observed. “Free” ClO4− ions appear to be the main charge carriers at the conductivity maximum located within the 25 ≤ n ≤ 8 composition range of this family of ormolytes. At n = 15 ClO4− ions coordinated in mono/tridentate (C3v symmetry) and bidentate (C2v symmetry) configurations were detected. In salt-rich samples with n < 15 there is a marked tendency for ionic association. The resulting decrease that occurs in the concentration of “free” ions is consistent with the observed significant decrease of the ionic conductivity. The analysis of the “amide I” and “amide II” regions provided solid proof that the Li+ ions bond to the urea carbonyl oxygen atoms over the entire range of salt concentration studied.Fundação para a Ciência e Tecnologia (FCT)ElsevierUniversidade do MinhoNunes, SílviaZea Bermudez, V. deOstrovskii, DavidTavares, P. B.Barbosa, P. C.Silva, Maria ManuelaSmith, Michael John2007-122007-12-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/1822/7752eng"Electrochimica Acta". ISSN 0013-4686. 53:4 (Dec. 2007) 1466-14750013-468610.1016/j.electacta.2007.04.061www.elsevier.cominfo: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:RCAAP2023-07-21T12:31:43Zoai:repositorium.sdum.uminho.pt:1822/7752Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T19:26:59.735862Repositório 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 |
Spectroscopic and structural studies of di-ureasils doped with lithium perchlorate |
title |
Spectroscopic and structural studies of di-ureasils doped with lithium perchlorate |
spellingShingle |
Spectroscopic and structural studies of di-ureasils doped with lithium perchlorate Nunes, Sílvia Solid polymer electrolyte Sol-gel process Di-ureasils FT-IR FT-Raman solid polymer electrolytes FT-lR FF-Raman Science & Technology |
title_short |
Spectroscopic and structural studies of di-ureasils doped with lithium perchlorate |
title_full |
Spectroscopic and structural studies of di-ureasils doped with lithium perchlorate |
title_fullStr |
Spectroscopic and structural studies of di-ureasils doped with lithium perchlorate |
title_full_unstemmed |
Spectroscopic and structural studies of di-ureasils doped with lithium perchlorate |
title_sort |
Spectroscopic and structural studies of di-ureasils doped with lithium perchlorate |
author |
Nunes, Sílvia |
author_facet |
Nunes, Sílvia Zea Bermudez, V. de Ostrovskii, David Tavares, P. B. Barbosa, P. C. Silva, Maria Manuela Smith, Michael John |
author_role |
author |
author2 |
Zea Bermudez, V. de Ostrovskii, David Tavares, P. B. Barbosa, P. C. Silva, Maria Manuela Smith, Michael John |
author2_role |
author author author author author author |
dc.contributor.none.fl_str_mv |
Universidade do Minho |
dc.contributor.author.fl_str_mv |
Nunes, Sílvia Zea Bermudez, V. de Ostrovskii, David Tavares, P. B. Barbosa, P. C. Silva, Maria Manuela Smith, Michael John |
dc.subject.por.fl_str_mv |
Solid polymer electrolyte Sol-gel process Di-ureasils FT-IR FT-Raman solid polymer electrolytes FT-lR FF-Raman Science & Technology |
topic |
Solid polymer electrolyte Sol-gel process Di-ureasils FT-IR FT-Raman solid polymer electrolytes FT-lR FF-Raman Science & Technology |
description |
Di-urea cross-linked POE/siloxane hybrid ormolytes (di-ureasils) doped with a wide concentration range of lithium perchlorate trihydrate (LiClO4·3H2O) (200 ≥ n ≥ 0.5, where n expresses the salt content in terms of the number of ether oxygen atoms per Li+ ion) have been analysed by Fourier transform infrared and Raman (FT-IR and FT-Raman, respectively) spectroscopies and X-ray diffraction (XRD). The results obtained lead us to conclude that the xerogels with n ≥ 5 are totally amorphous. At n ≤ 1 free salt is observed. “Free” ClO4− ions appear to be the main charge carriers at the conductivity maximum located within the 25 ≤ n ≤ 8 composition range of this family of ormolytes. At n = 15 ClO4− ions coordinated in mono/tridentate (C3v symmetry) and bidentate (C2v symmetry) configurations were detected. In salt-rich samples with n < 15 there is a marked tendency for ionic association. The resulting decrease that occurs in the concentration of “free” ions is consistent with the observed significant decrease of the ionic conductivity. The analysis of the “amide I” and “amide II” regions provided solid proof that the Li+ ions bond to the urea carbonyl oxygen atoms over the entire range of salt concentration studied. |
publishDate |
2007 |
dc.date.none.fl_str_mv |
2007-12 2007-12-01T00:00:00Z |
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 |
http://hdl.handle.net/1822/7752 |
url |
http://hdl.handle.net/1822/7752 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
"Electrochimica Acta". ISSN 0013-4686. 53:4 (Dec. 2007) 1466-1475 0013-4686 10.1016/j.electacta.2007.04.061 www.elsevier.com |
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 |
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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 |
repository.mail.fl_str_mv |
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1799132760102666240 |