A fluorescence probe study of gemini surfactants in aqueous solution: a comparison between n-2-n and n-6-n series of the alkanediyl-a,w-bis (dimethylalkylammonium bromides)

Detalhes bibliográficos
Autor(a) principal: Junior, P. B.S. [UNESP]
Data de Publicação: 2007
Outros Autores: Tiera, V. A.O. [UNESP], Tiera, M. J. [UNESP]
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1590/S0100-46702007000200008
http://hdl.handle.net/11449/22119
Resumo: Two series of alkanediyl-a,w-bis (dimethylalkylammonium bromide (n-2-n and n-6-n; n=8, 10,12, and 16) have been synthesized and their micelles properties studied in aqueous solution using pyrene, pyrenecarboxaldehyde (PCA) and 1,8 anilinonaphtalene sulfonic acid sodium salt (ANS) as fluorescent probes. The micelles from these surfactants have been characterized on the basis of the information provided by micelle-solubilized fluorescent probes. The obtained results indicated that the surfactant concentration at which a marked decrease in l max parameter of pyrenecarboxaldehyde (PCA) occurs corresponds to the CMC determined by conductimetric measurements. Changes in the emission spectra of ANS and PCA observed in the submicellar range for both surfactants series (n-2-n and n-6-n) were interpreted as formation of pre-aggregates. It was found that the dimeric surfactants with long spacer (s= 6) form more hydrated aggregates when compared with those formed by the n-2-n and CnTAB surfactants series. This was attributed to a more difficult packing of n-6-n surfactant molecules to form micelles.
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spelling A fluorescence probe study of gemini surfactants in aqueous solution: a comparison between n-2-n and n-6-n series of the alkanediyl-a,w-bis (dimethylalkylammonium bromides)Gemini surfactantsDimeric SurfactantsPyrenePremicellar aggregationTwo series of alkanediyl-a,w-bis (dimethylalkylammonium bromide (n-2-n and n-6-n; n=8, 10,12, and 16) have been synthesized and their micelles properties studied in aqueous solution using pyrene, pyrenecarboxaldehyde (PCA) and 1,8 anilinonaphtalene sulfonic acid sodium salt (ANS) as fluorescent probes. The micelles from these surfactants have been characterized on the basis of the information provided by micelle-solubilized fluorescent probes. The obtained results indicated that the surfactant concentration at which a marked decrease in l max parameter of pyrenecarboxaldehyde (PCA) occurs corresponds to the CMC determined by conductimetric measurements. Changes in the emission spectra of ANS and PCA observed in the submicellar range for both surfactants series (n-2-n and n-6-n) were interpreted as formation of pre-aggregates. It was found that the dimeric surfactants with long spacer (s= 6) form more hydrated aggregates when compared with those formed by the n-2-n and CnTAB surfactants series. This was attributed to a more difficult packing of n-6-n surfactant molecules to form micelles.Universidade Estadual Paulista Instituto de Biociências Letras e Ciências Exatas-São José do Rio Preto Departamento de FísicaUniversidade Estadual Paulista Instituto de Biociências Letras e Ciências Exatas-São José do Rio Preto Departamento de FísicaEditora UnespUniversidade Estadual Paulista (Unesp)Junior, P. B.S. [UNESP]Tiera, V. A.O. [UNESP]Tiera, M. J. [UNESP]2014-05-20T14:02:47Z2014-05-20T14:02:47Z2007-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article47-54application/pdfhttp://dx.doi.org/10.1590/S0100-46702007000200008Eclética Química. Fundação Editora da Universidade Estadual Paulista Júlio de Mesquita Filho - UNESP, v. 32, n. 2, p. 47-54, 2007.0100-4670http://hdl.handle.net/11449/2211910.1590/S0100-46702007000200008S0100-46702007000200008S0100-46702007000200008.pdf8796747160088337SciELOreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengEclética Químicainfo:eu-repo/semantics/openAccess2023-11-25T06:11:35Zoai:repositorio.unesp.br:11449/22119Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T18:39:09.679750Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv A fluorescence probe study of gemini surfactants in aqueous solution: a comparison between n-2-n and n-6-n series of the alkanediyl-a,w-bis (dimethylalkylammonium bromides)
title A fluorescence probe study of gemini surfactants in aqueous solution: a comparison between n-2-n and n-6-n series of the alkanediyl-a,w-bis (dimethylalkylammonium bromides)
spellingShingle A fluorescence probe study of gemini surfactants in aqueous solution: a comparison between n-2-n and n-6-n series of the alkanediyl-a,w-bis (dimethylalkylammonium bromides)
Junior, P. B.S. [UNESP]
Gemini surfactants
Dimeric Surfactants
Pyrene
Premicellar aggregation
title_short A fluorescence probe study of gemini surfactants in aqueous solution: a comparison between n-2-n and n-6-n series of the alkanediyl-a,w-bis (dimethylalkylammonium bromides)
title_full A fluorescence probe study of gemini surfactants in aqueous solution: a comparison between n-2-n and n-6-n series of the alkanediyl-a,w-bis (dimethylalkylammonium bromides)
title_fullStr A fluorescence probe study of gemini surfactants in aqueous solution: a comparison between n-2-n and n-6-n series of the alkanediyl-a,w-bis (dimethylalkylammonium bromides)
title_full_unstemmed A fluorescence probe study of gemini surfactants in aqueous solution: a comparison between n-2-n and n-6-n series of the alkanediyl-a,w-bis (dimethylalkylammonium bromides)
title_sort A fluorescence probe study of gemini surfactants in aqueous solution: a comparison between n-2-n and n-6-n series of the alkanediyl-a,w-bis (dimethylalkylammonium bromides)
author Junior, P. B.S. [UNESP]
author_facet Junior, P. B.S. [UNESP]
Tiera, V. A.O. [UNESP]
Tiera, M. J. [UNESP]
author_role author
author2 Tiera, V. A.O. [UNESP]
Tiera, M. J. [UNESP]
author2_role author
author
dc.contributor.none.fl_str_mv Universidade Estadual Paulista (Unesp)
dc.contributor.author.fl_str_mv Junior, P. B.S. [UNESP]
Tiera, V. A.O. [UNESP]
Tiera, M. J. [UNESP]
dc.subject.por.fl_str_mv Gemini surfactants
Dimeric Surfactants
Pyrene
Premicellar aggregation
topic Gemini surfactants
Dimeric Surfactants
Pyrene
Premicellar aggregation
description Two series of alkanediyl-a,w-bis (dimethylalkylammonium bromide (n-2-n and n-6-n; n=8, 10,12, and 16) have been synthesized and their micelles properties studied in aqueous solution using pyrene, pyrenecarboxaldehyde (PCA) and 1,8 anilinonaphtalene sulfonic acid sodium salt (ANS) as fluorescent probes. The micelles from these surfactants have been characterized on the basis of the information provided by micelle-solubilized fluorescent probes. The obtained results indicated that the surfactant concentration at which a marked decrease in l max parameter of pyrenecarboxaldehyde (PCA) occurs corresponds to the CMC determined by conductimetric measurements. Changes in the emission spectra of ANS and PCA observed in the submicellar range for both surfactants series (n-2-n and n-6-n) were interpreted as formation of pre-aggregates. It was found that the dimeric surfactants with long spacer (s= 6) form more hydrated aggregates when compared with those formed by the n-2-n and CnTAB surfactants series. This was attributed to a more difficult packing of n-6-n surfactant molecules to form micelles.
publishDate 2007
dc.date.none.fl_str_mv 2007-01-01
2014-05-20T14:02:47Z
2014-05-20T14:02:47Z
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://dx.doi.org/10.1590/S0100-46702007000200008
Eclética Química. Fundação Editora da Universidade Estadual Paulista Júlio de Mesquita Filho - UNESP, v. 32, n. 2, p. 47-54, 2007.
0100-4670
http://hdl.handle.net/11449/22119
10.1590/S0100-46702007000200008
S0100-46702007000200008
S0100-46702007000200008.pdf
8796747160088337
url http://dx.doi.org/10.1590/S0100-46702007000200008
http://hdl.handle.net/11449/22119
identifier_str_mv Eclética Química. Fundação Editora da Universidade Estadual Paulista Júlio de Mesquita Filho - UNESP, v. 32, n. 2, p. 47-54, 2007.
0100-4670
10.1590/S0100-46702007000200008
S0100-46702007000200008
S0100-46702007000200008.pdf
8796747160088337
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Eclética Química
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 47-54
application/pdf
dc.publisher.none.fl_str_mv Editora Unesp
publisher.none.fl_str_mv Editora Unesp
dc.source.none.fl_str_mv SciELO
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv
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