Contributions of intermicellar distance, micelle volume and screw angle to the temperature dependence of helical pitch in the intrinsic lyotropic cholesteric phases

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dc.authorid0000-0002-9974-9470en_US
dc.authorid0000-0002-9854-5177en_US
dc.contributor.authorAkpınar, Erol
dc.contributor.authorGiesselmann, Frank
dc.contributor.authorAcımış, Mahmut
dc.date.accessioned2021-06-23T19:36:19Z
dc.date.available2021-06-23T19:36:19Z
dc.date.issued2014
dc.departmentBAİBÜ, Fen Edebiyat Fakültesi, Kimya Bölümüen_US
dc.description.abstractTwo series of lyotropic quaternary liquid crystalline mixtures exhibiting intrinsic cholesteric phases were prepared from potassium N-dodecanoyl-L-alaninate (L-KDDA) and L-serinate (L-KDDS), having different amphiphile concentrations. The phase types and texture characterizations of the cholesteric phases were determined via polarizing light microscopy. The pitches of the cholesteric phases, depending on both concentration of the L-enantiomer and temperature, were measured by laser diffraction. The helical twisting power of the cholesteric phases was calculated from the pitch values in the temperature range of 25 and 45 degrees C. The results showed that the L-KDDA system had higher helical twisting power than the L-KDDS system at all temperatures. Small-angle x-ray scattering (saxs) technique was performed for determination of some micellar level parameters, e.g. intermicellar distance (W-perpendicular to), micelle volumes (V-mic), etc, and their temperature dependences. In addition, we calculated the screw or twist angle (theta) along the helix axis of the cholesteric phases as a function of temperature, combining the saxs results with the pitch values. According to all our experimental results, it seems that theta, V-mic and W-perpendicular to contribute differently to the temperature dependence of the helical pitch. It was observed that the less (the most) contribution was provided by the intermicellar distance (the screw angle). (C) 2013 Elsevier B.V. All rights reserved.en_US
dc.identifier.doi10.1016/j.molliq.2013.11.024
dc.identifier.endpage28en_US
dc.identifier.issn0167-7322
dc.identifier.issn1873-3166
dc.identifier.scopus2-s2.0-84890365018en_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.startpage20en_US
dc.identifier.urihttps://doi.org/10.1016/j.molliq.2013.11.024
dc.identifier.urihttps://hdl.handle.net/20.500.12491/7972
dc.identifier.volume191en_US
dc.identifier.wosWOS:000331022500004en_US
dc.identifier.wosqualityQ2en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.institutionauthorAkpınar, Erol
dc.institutionauthorAcımış, Mahmut
dc.language.isoenen_US
dc.publisherElsevier Science Bven_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.subjectSmall-angle x-ray Scatteringen_US
dc.subjectLyotropic Liquid Crystalsen_US
dc.subjectIntrinsic Cholesteric Phaseen_US
dc.subjectHelical Pitchen_US
dc.subjectScrew Angleen_US
dc.subjectIntermicellar Distanceen_US
dc.titleContributions of intermicellar distance, micelle volume and screw angle to the temperature dependence of helical pitch in the intrinsic lyotropic cholesteric phasesen_US
dc.typeArticleen_US

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