Gozde Barim - Highly Conducting Lyotropic Liquid Crystalline Mesophases of Pluronics (P65, P85, P103, and P123) and Hydrated Lithium Salts (LiCl and LiNO3)

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      Publication Details (including relevant citation   information):

      Langmuir

      Gözde Barım, Cemal Albayrak, Ezgi Yilmaz, Ömer   Dag

    DOI: 10.1021/la5006105

    Publication Date (Web): May 29, 2014

     

      Abstract:

        Demand for ionicly conducting materials, as membranes and   electrodes, is one of the driving forces of current research in   chemistry, physics and engineering. The lithium ion is a key   element of these materials and its assembly into nanostructures   and mesophases are important for the membrane and electrode   technologies. In this investigation, we show that hydrated   lithium salts (such as LiCl•xH2O and LiNO3•xH2O, x is as low as   1.5 and 3.0, respectively) and pluronics (tri-block co-polymer   such as PX where X is 65, 85, 103, and 123) form lyotropic liquid   crystalline mesophases (LLCM), denoted as LiY•xH2O-PX-n (Y is Cl-   or NO3-, and n is salt/PX mole ratio). The structure of the   mesophase is hexagonal over a broad salt concentration and   transforms to a cubic mesophase and then to disordered gel-phase   with an increasing salt content of the mixtures. The mesophases   are unstable at low salt contents and undergo a phase separation   into pure pluronics and salt rich LLCMs. The salt content of the   ordered mesophase can be as high as 30 mole ratio for each   pluronic, which is a record high for any known salted phases. The   mesophases also display high AC ionic conductivities, reaching up   to 21 mS/cm at room temperature (RT) and are sensitive to the   water content. These mesophases can be useful as ion-conducting   membranes and can be used as media for the synthesis of lithium   containing nanoporous materials.

      Co-Authors:
      gbrm

      Address (URL): http://pubs.acs.org/doi/abs/10.1021/la5006105