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      Core/shell-structured, covalently bonded TiO2/poly(3,4-ethylenedioxythiophene) dispersions and their electrorheological response: The effect of anisotropy

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      Author(s)
      Erol, O.
      Unal, H. I.
      Date
      2015
      Source Title
      RSC Advances
      Print ISSN
      2046-2069
      Publisher
      Royal Society of Chemistry
      Volume
      5
      Issue
      125
      Pages
      103159 - 103171
      Language
      English
      Type
      Article
      Item Usage Stats
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      Abstract
      As a new electrorheological (ER) material, core/shell nanorods composed of a titania core and conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT) shell were prepared via covalent bonding to achieve a thin polymer shell and make the interfacial interactions between the two components more impressive. The successful coating of PEDOT on the nanorod-TiO2 particles was confirmed by TEM analysis. The antisedimentation stability of the core/shell nanorod-TiO2/PEDOT particles was determined to be 100%. The ER properties of the materials were studied under controlled shear, oscillatory shear and creep tests. The dielectric spectra of the dispersions were obtained to further understand their ER responses and fitted with the Cole-Cole equation. The ER behavior of the dispersions was also observed using an optical microscope. The flow curves of these ER fluids were determined under various electric field strengths and their flow characteristics examined via a rheological equation using the Cho-Choi-Jhon (CCJ) model. In addition, the results were also compared with nanoparticle-TiO2/PEDOT. It was concluded that the conducting thin polymer shell and elongated structure of the hybrid material introduced a synergistic effect on the electric field induced polarizability and colloidal stability against sedimentation, which resulted in stronger ER activity, storage modulus and higher recovery after stress loadings when compared to nanoparticle-TiO2/PEDOT. © The Royal Society of Chemistry.
      Keywords
      Conducting polymers
      Electric fields
      Electrorheological fluids
      Hybrid materials
      Nanofluidics
      Nanoparticles
      Nanorods
      Rheology
      Titanium dioxide
      3 ,4-ethylenedioxythiophene
      Electric field induced
      Electric field strength
      Electrorheological response
      Flow charac-teristics
      Interfacial interaction
      Poly(3 ,4 ethylenedioxythiophene) (PEDOT)
      Rheological equations
      Dispersions
      Permalink
      http://hdl.handle.net/11693/26452
      Published Version (Please cite this version)
      https://doi.org/10.1039/c5ra20284a
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      • Nanotechnology Research Center (NANOTAM) 1125
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