Effect of the anionic azo dye sunset yellow in lyotropic mixtures with uniaxial and biaxial nematic phases

dc.authorid0000-0002-9854-5177
dc.contributor.authorAkpınar, Erol
dc.contributor.authorTopçu, Gökhan
dc.contributor.authorReis, Dennys
dc.contributor.authorFigueiredo Neto, Antonio Martins
dc.date.accessioned2021-06-23T19:53:50Z
dc.date.available2021-06-23T19:53:50Z
dc.date.issued2020
dc.departmentBAİBÜ, Fen Edebiyat Fakültesi, Kimya Bölümüen_US
dc.description.abstractThe effects of the anionic azo dye Sunset Yellow on the stabilization of lyotropic uniaxial and biaxial nematic phases and on the uniaxial to biaxial phase transitions were studied. The dye was added in different concentrations to the host ternary mixture of cationic surfactant dodecyltrimethylammonium bromide, 1-dodecanol, and water. Furthermore, an investigation examined the role of the dye in the lyotropic host mixture in comparison to some inorganic salts containing anions of the Hofmeister series. The following inorganic salts were added to the same host mixture: NaBr, NaNO3, NaClO3, NaI, NaSCN, and NaClO4. All the samples were investigated by polarizing optical microscopy, laser conoscopy, and small-angle X-ray scattering. The results indicated that (a) the anionic dye Sunset Yellow has a chaotropic character between that of the I- and SCN- ions, being similar to the last one, (b) it gives a larger biaxial nematic phase temperature range in the partial phase diagram in comparison with the SCN- ion and other inorganic salts, and (c) it shifts the temperatures of both uniaxial to the biaxial nematic phase transitions. The small-angle X-ray scattering results also indicated that, at least in the investigated concentration range, the dye is mainly located on the micelles' surfaces, just like a conventional ion, and that on increasing concentration the dye molecules induces higher aggregation number of the micelles. (C) 2020 Elsevier B.V. All rights reserved.en_US
dc.identifier.doi10.1016/j.molliq.2020.114010
dc.identifier.issn0167-7322
dc.identifier.issn1873-3166
dc.identifier.scopus2-s2.0-85089739954en_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.urihttps://doi.org/10.1016/j.molliq.2020.114010
dc.identifier.urihttps://hdl.handle.net/20.500.12491/10283
dc.identifier.volume318en_US
dc.identifier.wosWOS:000583924900080en_US
dc.identifier.wosqualityQ1en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.institutionauthorAkpınar, Erol
dc.institutionauthorTopçu, Gökhan
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.relation.ispartofJournal Of Molecular Liquidsen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectLyotropic Liquid Crystalen_US
dc.subjectNematic Phaseen_US
dc.subjectBiaxial Nematic Phaseen_US
dc.subjectAnionic Azo Dye Sunset Yellowen_US
dc.subjectHofmeister Seriesen_US
dc.subjectPolarizing Optical Microscopyen_US
dc.subjectLaser Conoscopyen_US
dc.subjectSmall-angle X-ray Scatteringen_US
dc.titleEffect of the anionic azo dye sunset yellow in lyotropic mixtures with uniaxial and biaxial nematic phasesen_US
dc.typeArticleen_US

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