Effect of alkyl chain length of alcohols on nematic uniaxial-to-biaxial phase transitions in a potassium laurate/alcohol/K2SO4/water lyotropic mixture

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dc.authorid0000-0002-6339-8699en_US
dc.authorid0000-0002-6339-8699en_US
dc.authorid0000-0002-9854-5177en_US
dc.contributor.authorAkpınar, Erol
dc.contributor.authorReis, Dennys
dc.contributor.authorFigueiredo Neto, Antonio Martins
dc.date.accessioned2021-06-23T19:33:59Z
dc.date.available2021-06-23T19:33:59Z
dc.date.issued2012
dc.departmentBAİBÜ, Fen Edebiyat Fakültesi, Kimya Bölümüen_US
dc.description.abstractLyotropic liquid crystalline quaternary mixtures of potassium laurate (KL), potassium sulphate (K2SO4)/alcohol (n-OH)/water, with the alcohols having different numbers of carbon atoms in the alkyl chain (n), from 1-octanol to 1-hexadecanol, were investigated by optical techniques (optical microscopy and laser conoscopy). The biaxial nematic phase domain is present in a window of values of n = n(KL) +/- 2, where n(KL) = 11 is the number of carbon atoms in the alkyl chain of KL. The biaxial phase domain became smaller and the uniaxial-to-biaxial phase transition temperatures shifted to relatively higher temperatures upon going from 1-nonanol to 1-tridecanol. Moreover, compared with other lyotropic mixtures these new mixtures present high birefringence values, which we expect to be related to the micellar shape anisotropy. Our results are interpreted assuming that alcohol molecules tend to segregate in the micelles in a way that depends on the relative value of n with respect to nKL. The larger the value of n, the more alcohol molecules tend to be located in the curved parts of the micelle, favoring the uniaxial nematic calamitic phase with respect to the biaxial and uniaxial discotic nematic phases.en_US
dc.identifier.doi10.1080/02678292.2012.686637
dc.identifier.endpage888en_US
dc.identifier.issn0267-8292
dc.identifier.issue7en_US
dc.identifier.scopus2-s2.0-84862618256en_US
dc.identifier.scopusqualityQ2en_US
dc.identifier.startpage881en_US
dc.identifier.urihttps://doi.org/10.1080/02678292.2012.686637
dc.identifier.urihttps://hdl.handle.net/20.500.12491/7325
dc.identifier.volume39en_US
dc.identifier.wosWOS:000305560100013en_US
dc.identifier.wosqualityQ2en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.institutionauthorAkpınar, Erol
dc.language.isoenen_US
dc.publisherTaylor & Francis Ltden_US
dc.relation.ispartofLiquid Crystalsen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectLyotropicen_US
dc.subjectBirefringenceen_US
dc.subjectConoscopyen_US
dc.subjectMolecular Segregationen_US
dc.titleEffect of alkyl chain length of alcohols on nematic uniaxial-to-biaxial phase transitions in a potassium laurate/alcohol/K2SO4/water lyotropic mixtureen_US
dc.typeArticleen_US

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