Monitoring the phase transition of C12E5/water/alkane microemulsions through excimer formation

Detalhes bibliográficos
Autor(a) principal: Real Oliveira, M. Elisabete C.D.
Data de Publicação: 2000
Outros Autores: Hungerford, Graham, Castanheira, Elisabete M. S., Miguel, M. da G., Burrows, H. D.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/1822/62858
Resumo: The phase transition of microemulsions involving the nonionic surfactant C12E5 [C12H25(OCH2-CH2)5OH], water, and alkanes (heptane, decane and tetradecane) has been investigated through the excimer formation of pyrene. On going to the microemulsion bicontinuous phase, by changing either composition or temperature, pronounced changes in the pyrene excimer-to-monomer fluorescence intensity ratio, IE/IM, are observed. Several differences in the steady-state emission spectra and in fluorescence decay curves show that as a probe pyrene is well suited to follow the transition from the water continuous to the oil continuous phase, through an intermediate bicontinuous (continuous in both water and oil) region. The results provide information about the different characteristics and structure of these three regions (water continuous, bicontinuous, and oil continuous) of the phase diagram for C12E5/water/alkane systems.
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spelling Monitoring the phase transition of C12E5/water/alkane microemulsions through excimer formationNonionic surfactantMicroemulsionExcimerPyrenePhase transitionCiências Naturais::Ciências FísicasScience & TechnologyThe phase transition of microemulsions involving the nonionic surfactant C12E5 [C12H25(OCH2-CH2)5OH], water, and alkanes (heptane, decane and tetradecane) has been investigated through the excimer formation of pyrene. On going to the microemulsion bicontinuous phase, by changing either composition or temperature, pronounced changes in the pyrene excimer-to-monomer fluorescence intensity ratio, IE/IM, are observed. Several differences in the steady-state emission spectra and in fluorescence decay curves show that as a probe pyrene is well suited to follow the transition from the water continuous to the oil continuous phase, through an intermediate bicontinuous (continuous in both water and oil) region. The results provide information about the different characteristics and structure of these three regions (water continuous, bicontinuous, and oil continuous) of the phase diagram for C12E5/water/alkane systems.FCT financiamento plurianual do CFUMG.H. would like to thank the Fundação para a Ciência e a Tecnologia (PRAXIS XXI) for financial support, as would M. da G.M. and H.D.B. (Project 2/2.1/QUI/411/94).SpringerUniversidade do MinhoReal Oliveira, M. Elisabete C.D.Hungerford, GrahamCastanheira, Elisabete M. S.Miguel, M. da G.Burrows, H. D.2000-122000-12-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/1822/62858engOliveira, M.E.C.D.R., Hungerford, G., Castanheira, E.M.S. et al. Monitoring the Phase Transition of C12E5/Water/Alkane Microemulsions Through Excimer Formation. Journal of Fluorescence 10, 347–353 (2000) doi:10.1023/A:10094223285491053-05091573-499410.1023/A:1009422328549https://link.springer.com/article/10.1023/A:1009422328549info: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:RCAAP2023-07-21T12:25:08Zoai:repositorium.sdum.uminho.pt:1822/62858Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T19:19:19.671066Repositório 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 Monitoring the phase transition of C12E5/water/alkane microemulsions through excimer formation
title Monitoring the phase transition of C12E5/water/alkane microemulsions through excimer formation
spellingShingle Monitoring the phase transition of C12E5/water/alkane microemulsions through excimer formation
Real Oliveira, M. Elisabete C.D.
Nonionic surfactant
Microemulsion
Excimer
Pyrene
Phase transition
Ciências Naturais::Ciências Físicas
Science & Technology
title_short Monitoring the phase transition of C12E5/water/alkane microemulsions through excimer formation
title_full Monitoring the phase transition of C12E5/water/alkane microemulsions through excimer formation
title_fullStr Monitoring the phase transition of C12E5/water/alkane microemulsions through excimer formation
title_full_unstemmed Monitoring the phase transition of C12E5/water/alkane microemulsions through excimer formation
title_sort Monitoring the phase transition of C12E5/water/alkane microemulsions through excimer formation
author Real Oliveira, M. Elisabete C.D.
author_facet Real Oliveira, M. Elisabete C.D.
Hungerford, Graham
Castanheira, Elisabete M. S.
Miguel, M. da G.
Burrows, H. D.
author_role author
author2 Hungerford, Graham
Castanheira, Elisabete M. S.
Miguel, M. da G.
Burrows, H. D.
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Universidade do Minho
dc.contributor.author.fl_str_mv Real Oliveira, M. Elisabete C.D.
Hungerford, Graham
Castanheira, Elisabete M. S.
Miguel, M. da G.
Burrows, H. D.
dc.subject.por.fl_str_mv Nonionic surfactant
Microemulsion
Excimer
Pyrene
Phase transition
Ciências Naturais::Ciências Físicas
Science & Technology
topic Nonionic surfactant
Microemulsion
Excimer
Pyrene
Phase transition
Ciências Naturais::Ciências Físicas
Science & Technology
description The phase transition of microemulsions involving the nonionic surfactant C12E5 [C12H25(OCH2-CH2)5OH], water, and alkanes (heptane, decane and tetradecane) has been investigated through the excimer formation of pyrene. On going to the microemulsion bicontinuous phase, by changing either composition or temperature, pronounced changes in the pyrene excimer-to-monomer fluorescence intensity ratio, IE/IM, are observed. Several differences in the steady-state emission spectra and in fluorescence decay curves show that as a probe pyrene is well suited to follow the transition from the water continuous to the oil continuous phase, through an intermediate bicontinuous (continuous in both water and oil) region. The results provide information about the different characteristics and structure of these three regions (water continuous, bicontinuous, and oil continuous) of the phase diagram for C12E5/water/alkane systems.
publishDate 2000
dc.date.none.fl_str_mv 2000-12
2000-12-01T00:00:00Z
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/1822/62858
url http://hdl.handle.net/1822/62858
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Oliveira, M.E.C.D.R., Hungerford, G., Castanheira, E.M.S. et al. Monitoring the Phase Transition of C12E5/Water/Alkane Microemulsions Through Excimer Formation. Journal of Fluorescence 10, 347–353 (2000) doi:10.1023/A:1009422328549
1053-0509
1573-4994
10.1023/A:1009422328549
https://link.springer.com/article/10.1023/A:1009422328549
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 Springer
publisher.none.fl_str_mv Springer
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
repository.mail.fl_str_mv
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