Anomalous behavior in the crossover between the negative and positive biaxial nematic mesophases in a lyotropic liquid crystal

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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 M.
dc.date.accessioned2021-06-23T19:35:56Z
dc.date.available2021-06-23T19:35:56Z
dc.date.issued2014
dc.departmentBAİBÜ, Fen Edebiyat Fakültesi, Kimya Bölümüen_US
dc.description.abstractA novel quaternary lyotropic liquid-crystalline mixture of dodecyltrimethylammonium bromide (DDTMABr)/sodium bromide/1-dodecanol/water, presenting the biaxial nematic phase (N-B) in addition to two uniaxial discotic (N-D) and calamitic (N-C) nematic ones, was synthesized. The partial phase diagram of this new mixture was constructed as a function of the DDTMABr molar-fraction concentration. The phase transitions from uniaxial to biaxial nematic phases were studied by means of the temperature dependence of the optical birefringence. In a particular region of the phase diagram, anomalous behavior was observed in the crossover from N-B(-) to N-B(+) : the contrast of the conoscopic fringes, which allows the birefringence measurements, almost vanishes, and the sample loses its alignment. This behavior, which was not observed before in lyotropics, was interpreted as a decrease in the mean diamagnetic susceptibility anisotropy (Delta chi) of the sample, which was related to the shape anisotropy of the micelles. Small-angle X-ray scattering measurements were performed to evaluate the micellar shape anisotropy; these revealed that this mixture presented a smaller shape anisotropy than those of other lyotropic micellar systems presenting the N-B phase.en_US
dc.identifier.doi10.1002/cphc.201301003
dc.identifier.endpage1469en_US
dc.identifier.issn1439-4235
dc.identifier.issn1439-7641
dc.identifier.issue7en_US
dc.identifier.pmid24692308en_US
dc.identifier.scopus2-s2.0-84900495946en_US
dc.identifier.scopusqualityQ2en_US
dc.identifier.startpage1463en_US
dc.identifier.urihttps://doi.org/10.1002/cphc.201301003
dc.identifier.urihttps://hdl.handle.net/20.500.12491/7897
dc.identifier.volume15en_US
dc.identifier.wosWOS:000335515900023en_US
dc.identifier.wosqualityQ1en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.indekslendigikaynakPubMeden_US
dc.institutionauthorAkpınar, Erol
dc.language.isoenen_US
dc.publisherWiley-V C H Verlag Gmbhen_US
dc.relation.ispartofChemphyschemen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectLiquid Crystalsen_US
dc.subjectMagnetic Propertiesen_US
dc.subjectMesophasesen_US
dc.subjectMicellesen_US
dc.subjectPhase Transitionsen_US
dc.titleAnomalous behavior in the crossover between the negative and positive biaxial nematic mesophases in a lyotropic liquid crystalen_US
dc.typeArticleen_US

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