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)

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dc.contributor.authorJunior, P. B.S. [UNESP]
dc.contributor.authorTiera, V. A.O. [UNESP]
dc.contributor.authorTiera, M. J. [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T14:02:47Z
dc.date.available2014-05-20T14:02:47Z
dc.date.issued2007-01-01
dc.description.abstractTwo 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.en
dc.description.affiliationUniversidade Estadual Paulista Instituto de Biociências Letras e Ciências Exatas-São José do Rio Preto Departamento de Física
dc.description.affiliationUnespUniversidade Estadual Paulista Instituto de Biociências Letras e Ciências Exatas-São José do Rio Preto Departamento de Física
dc.format.extent47-54
dc.identifierhttp://dx.doi.org/10.1590/S0100-46702007000200008
dc.identifier.citationEclética Química. Fundação Editora da Universidade Estadual Paulista Júlio de Mesquita Filho - UNESP, v. 32, n. 2, p. 47-54, 2007.
dc.identifier.doi10.1590/S0100-46702007000200008
dc.identifier.fileS0100-46702007000200008.pdf
dc.identifier.issn0100-4670
dc.identifier.lattes8796747160088337
dc.identifier.scieloS0100-46702007000200008
dc.identifier.urihttp://hdl.handle.net/11449/22119
dc.language.isoeng
dc.publisherEditora Unesp
dc.relation.ispartofEclética Química
dc.rights.accessRightsAcesso aberto
dc.sourceSciELO
dc.subjectGemini surfactantsen
dc.subjectDimeric Surfactantsen
dc.subjectPyreneen
dc.subjectPremicellar aggregationen
dc.titleA 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)en
dc.typeArtigo
unesp.author.lattes8796747160088337
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Biociências Letras e Ciências Exatas, São José do Rio Pretopt

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Artigos - Física - IBILCE