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      The role of charged surfactants in the thermal and structural properties of lyotropic liquid crystalline mesophases of [Zn(H2O)6](NO3)2-CnEOm-H2O

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      Author
      Albayrak, C.
      Soylu, A. M.
      Dag, Ö.
      Date
      2010
      Source Title
      Journal of Colloid and Interface Science
      Print ISSN
      0021-9797
      Electronic ISSN
      1095-7103
      Volume
      341
      Issue
      1
      Pages
      109 - 116
      Language
      English
      Type
      Article
      Item Usage Stats
      114
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      92
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      Abstract
      The mixtures of [Zn(H2O)6](NO3)2 salt, 10-lauryl ether (C12H25(OCH2CH2)10OH, represented as C12EO10), a charged surfactant (cetyltrimethylammonium bromide, C16H33N(CH3)3Br, represented as CTAB or sodium dodecylsulfate, C12H25OSO3Na, SDS) and water form lyotropic liquid crystalline mesophases (LLCM). This assembly accommodates up to 8.0 Zn(II) ions (corresponds to about 80% w/w salt/(salt + C12EO10)) for each C12EO10 in the presence of a 1.0 CTAB (or 0.5 SDS) and 3.5 H2O in its LC phase. The salt concentration can be increased by increasing charged surfactant concentration of the media. Addition of charged surfactant to the [Zn(H2O)6](NO3)2–C12EO10 mesophase not only increases the salt content, it can also increase the water content of the media. The charged surfactant-C12EO10 (hydrophobic tail groups) and the surfactant (head groups)-salt ion (ion-pair, hydrogen-bonding) interactions stabilize the mesophases at such salt high and water concentrations. The presence of both Br and NO 3 ions influences the thermal and structural properties of the [Zn(H2O)6](NO3)2–C12EO10–CTAB(or SDS)–H2O LLCM, which have been investigated using XRD, POM (with a hot stage), FT-IR and Raman techniques.
      Keywords
      C12EO10
      CTAB
      SDS
      Lyotropic liquid crystals
      Transition metal salt
      Mesophase
      Permalink
      http://hdl.handle.net/11693/22472
      Published Version (Please cite this version)
      http://dx.doi.org/10.1016/j.jcis.2009.09.038
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