Uso de membranas de Nafion para a construção de sensores ópticos para medidas de pH

Detalhes bibliográficos
Autor(a) principal: Pinheiro,Silvia Cristina Lopes
Data de Publicação: 2005
Outros Autores: Raimundo Jr,Ivo M.
Tipo de documento: Relatório
Idioma: por
Título da fonte: Química Nova (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422005000500036
Resumo: The behaviour of Nafion® polymeric membranes containing acid-base dyes, bromothymol blue (BB) and methyl violet (MV), were studied aiming at constructing an optical sensor for pH measurement. BB revealed to be inadequate for developing sensing phases due to the electrostatic repulsion between negative groups of their molecules and the negative charge of the sulfonate group of the Nafion®, which causes leaching of the dye from the membrane. On the other hand, MV showed to be suitable due to the presence of positive groups in its structure. The membrane prepared from a methanolic solution whose Nafion®/dye molar ratio was 20 presented the best analytical properties, changing its color from green to violet in the pH range from 0.6 to 3.0. The membrane can be prepared with good reproducibility, presenting durability of ca. 6 months and response time of 22 s, making possible its use for pH determination in flow analysis systems.
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spelling Uso de membranas de Nafion para a construção de sensores ópticos para medidas de pHoptical sensoroptodepH sensorThe behaviour of Nafion® polymeric membranes containing acid-base dyes, bromothymol blue (BB) and methyl violet (MV), were studied aiming at constructing an optical sensor for pH measurement. BB revealed to be inadequate for developing sensing phases due to the electrostatic repulsion between negative groups of their molecules and the negative charge of the sulfonate group of the Nafion®, which causes leaching of the dye from the membrane. On the other hand, MV showed to be suitable due to the presence of positive groups in its structure. The membrane prepared from a methanolic solution whose Nafion®/dye molar ratio was 20 presented the best analytical properties, changing its color from green to violet in the pH range from 0.6 to 3.0. The membrane can be prepared with good reproducibility, presenting durability of ca. 6 months and response time of 22 s, making possible its use for pH determination in flow analysis systems.Sociedade Brasileira de Química2005-10-01info:eu-repo/semantics/reportinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422005000500036Química Nova v.28 n.5 2005reponame:Química Nova (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.1590/S0100-40422005000500036info:eu-repo/semantics/openAccessPinheiro,Silvia Cristina LopesRaimundo Jr,Ivo M.por2005-09-23T00:00:00Zoai:scielo:S0100-40422005000500036Revistahttps://www.scielo.br/j/qn/ONGhttps://old.scielo.br/oai/scielo-oai.phpquimicanova@sbq.org.br1678-70640100-4042opendoar:2005-09-23T00:00Química Nova (Online) - Sociedade Brasileira de Química (SBQ)false
dc.title.none.fl_str_mv Uso de membranas de Nafion para a construção de sensores ópticos para medidas de pH
title Uso de membranas de Nafion para a construção de sensores ópticos para medidas de pH
spellingShingle Uso de membranas de Nafion para a construção de sensores ópticos para medidas de pH
Pinheiro,Silvia Cristina Lopes
optical sensor
optode
pH sensor
title_short Uso de membranas de Nafion para a construção de sensores ópticos para medidas de pH
title_full Uso de membranas de Nafion para a construção de sensores ópticos para medidas de pH
title_fullStr Uso de membranas de Nafion para a construção de sensores ópticos para medidas de pH
title_full_unstemmed Uso de membranas de Nafion para a construção de sensores ópticos para medidas de pH
title_sort Uso de membranas de Nafion para a construção de sensores ópticos para medidas de pH
author Pinheiro,Silvia Cristina Lopes
author_facet Pinheiro,Silvia Cristina Lopes
Raimundo Jr,Ivo M.
author_role author
author2 Raimundo Jr,Ivo M.
author2_role author
dc.contributor.author.fl_str_mv Pinheiro,Silvia Cristina Lopes
Raimundo Jr,Ivo M.
dc.subject.por.fl_str_mv optical sensor
optode
pH sensor
topic optical sensor
optode
pH sensor
description The behaviour of Nafion® polymeric membranes containing acid-base dyes, bromothymol blue (BB) and methyl violet (MV), were studied aiming at constructing an optical sensor for pH measurement. BB revealed to be inadequate for developing sensing phases due to the electrostatic repulsion between negative groups of their molecules and the negative charge of the sulfonate group of the Nafion®, which causes leaching of the dye from the membrane. On the other hand, MV showed to be suitable due to the presence of positive groups in its structure. The membrane prepared from a methanolic solution whose Nafion®/dye molar ratio was 20 presented the best analytical properties, changing its color from green to violet in the pH range from 0.6 to 3.0. The membrane can be prepared with good reproducibility, presenting durability of ca. 6 months and response time of 22 s, making possible its use for pH determination in flow analysis systems.
publishDate 2005
dc.date.none.fl_str_mv 2005-10-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/report
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format report
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422005000500036
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422005000500036
dc.language.iso.fl_str_mv por
language por
dc.relation.none.fl_str_mv 10.1590/S0100-40422005000500036
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Sociedade Brasileira de Química
publisher.none.fl_str_mv Sociedade Brasileira de Química
dc.source.none.fl_str_mv Química Nova v.28 n.5 2005
reponame:Química Nova (Online)
instname:Sociedade Brasileira de Química (SBQ)
instacron:SBQ
instname_str Sociedade Brasileira de Química (SBQ)
instacron_str SBQ
institution SBQ
reponame_str Química Nova (Online)
collection Química Nova (Online)
repository.name.fl_str_mv Química Nova (Online) - Sociedade Brasileira de Química (SBQ)
repository.mail.fl_str_mv quimicanova@sbq.org.br
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