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Effect of head-group size of some tetradecylalkylammonium bromide surfactants on obtaining the lyotropic biaxial nematic phase

  • Erol AkpinarEmail author
  • Emre Guner
  • Oznur Demir-Ordu
  • Antônio Martins Figueiredo Neto
Regular Article
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Abstract.

Lyotropic quaternary mixtures of some tetradecylalkylammonium bromide surfactants were prepared to examine the effect of the size of the surfactant head group on the stabilization of different lyotropic nematic phases. The lyotropic mixtures were prepared by the addition of the tetradecylalkylammonium bromides (TTAABr) in the mixture of NaBr/decanol (DeOH)/water. The uniaxial to biaxial nematic phase transitions were determined via laser conoscopy. Some micellization parameters such as critical micelle concentration, degree of counterion binding and micellization Gibbs energy were evaluated from the electrical conductivity measurements of diluted binary surfactants/water solutions. The results indicate that the head-group size of the surfactant molecules influences the amphiphilic molecular aggregate topology. Moreover, the effective area per surfactant head group is a key parameter on stabilizing the lyotropic biaxial nematic phase.

Graphical abstract

Keywords

Soft Matter: Liquid crystals 

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Copyright information

© EDP Sciences, Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Erol Akpinar
    • 1
    Email author
  • Emre Guner
    • 1
  • Oznur Demir-Ordu
    • 1
  • Antônio Martins Figueiredo Neto
    • 2
  1. 1.Bolu Abant Izzet Baysal University, Faculty of Arts and Sciences, Department of ChemistryBoluTurkey
  2. 2.Instituto de FísicaUniversidade de São PauloSão PauloBrazil

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