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      Salt-acid-surfactant lyotropic liquid crystalline mesophases: synthesis of highly transparent mesoporous calcium hydroxyapatite thin films

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      Author(s)
      Tunkara, E.
      Dag, Ö.
      Date
      2016
      Source Title
      European Journal of Inorganic Chemistry
      Print ISSN
      1434-1948
      Electronic ISSN
      1099-0682
      Publisher
      Wiley-VCH Verlag
      Volume
      2016
      Issue
      13-14
      Pages
      2114 - 2121
      Language
      English
      Type
      Article
      Item Usage Stats
      113
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      112
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      Abstract
      Even though calcium hydroxyapatite [Ca10(PO4)6(OH)2, HAp] is one of the most investigated materials in the literature, the synthesis of mesoporous transparent thin film of HAp has not yet been reported. We show herein that mixtures of phosphoric acid (H3PO4·H2O, PA), calcium nitrate tetrahydrate [Ca(NO3)2·4H2O, CaN] and non‐ionic surfactant [C12H25(OCH2CH2)10OH, C12E10] can self‐assemble into stable lyotropic liquid crystalline (LLC) mesophases. The clear aqueous solutions of the mixtures can be spin‐coated over any substrate and then calcined to form highly transparent mesoporous HAp (mHAp) thin films. From among the compositions studied, three molar ratios of CaN/PA/C12E10 [3.3:2:1 (low), 5.8:3.5:1 (intermediate) and 8.4:5:1 (high)] were chosen for large‐scale preparation to investigate their structural and thermal properties. The mHAp films form at around 300 °C and fully crystalize at 500 °C, retaining their transparency, uniformity and porosity in all compositions with few differences. The surface area and pore volume decrease, and the pore size and pore size distribution increase with increasing annealing temperature for all compositions.
      Keywords
      Calcium
      Liquid crystals
      Mesoporous materials
      Surfactants
      Thin films
      Permalink
      http://hdl.handle.net/11693/36960
      Published Version (Please cite this version)
      http://dx.doi.org/10.1002/ejic.201501116
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