Effect of alkyl chain length of alcohols on cholesteric uniaxial to cholesteric biaxial phase transitions in a potassium laurate/alcohol/potassium sulfate/water/brucine lyotropic mixture : evidence of a first-order phase transition

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dc.authorid0000-0002-6339-8699en_US
dc.authorid0000-0002-9854-5177en_US
dc.contributor.authorReis, Dennys
dc.contributor.authorAkpınar, Erol
dc.contributor.authorFigueiredo Neto, Antonio Martins
dc.date.accessioned2021-06-23T19:34:52Z
dc.date.available2021-06-23T19:34:52Z
dc.date.issued2013
dc.departmentBAİBÜ, Fen Edebiyat Fakültesi, Kimya Bölümüen_US
dc.description.abstractLyotropic cholesteric liquid crystalline phases were prepared by doping the quaternary mixture of potassium laurate (KL)/potassium sulfate (K2SO4)/alcohol (n-OH)/water with the chiral agent brucine. Different long-chain alcohols whose alkyl chains (n) vary from 8 (1-octanol) to 16 (1-hexadecanol) were used. The cholesteric uniaxial to cholesteric biaxial phase transitions were investigated by measuring the birefringences via polarizing optical microscopy, and the phase diagram was constructed as a function of the alkyl chain length of the alcohols. Alcohols with 9 <= n <= 12 presented the three cholesteric phases (cholesteric discotic-Ch(D), cholesteric biaxial-Ch(B), and cholesteric calamitic-Ch(C)). The Ch(D)-to-Ch(B) transition was shown to be continuous, with a bare correlation length bigger than the typical micellar dimensions. Mixtures with n = 8 and n = 13 showed a first-order phase transition between the Ch(D) and the Ch(C) phases, without the presence of the Ch(B) phase in between. These results are interpreted in terms of the nanosegregation of the alcohol molecules in the micelles with respect to the main amphiphiles molecules.en_US
dc.identifier.doi10.1021/jp310981d
dc.identifier.endpage948en_US
dc.identifier.issn1520-6106
dc.identifier.issue3en_US
dc.identifier.pmid23270561en_US
dc.identifier.scopus2-s2.0-84872874025en_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.startpage942en_US
dc.identifier.urihttps://doi.org/10.1021/jp310981d
dc.identifier.urihttps://hdl.handle.net/20.500.12491/7644
dc.identifier.volume117en_US
dc.identifier.wosWOS:000314205200023en_US
dc.identifier.wosqualityQ2en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.indekslendigikaynakPubMeden_US
dc.institutionauthorAkpınar, Erol
dc.language.isoenen_US
dc.publisherAmer Chemical Socen_US
dc.relation.ispartofJournal Of Physical Chemistry Ben_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.titleEffect of alkyl chain length of alcohols on cholesteric uniaxial to cholesteric biaxial phase transitions in a potassium laurate/alcohol/potassium sulfate/water/brucine lyotropic mixture : evidence of a first-order phase transitionen_US
dc.typeArticleen_US

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