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Structure changes of electrorheological fluids based on polyaniline particles with various hydrophilicities and time dependence of shear stress and conductivity during flow

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Abstract

Particles of polyaniline protonated with perfluorooctanesulfonic acid provided a material with hydrophobic surface. This property enabled its perfect dispersion in silicone oil due to its good compatibility with the hydrophobic medium. In contrast, in a suspension of hydrophilic polyaniline particles doped with sulfamic acid, strong interactions of particles prevailed, which led to the formation of entangled chains of aggregated particles in suspension. The difference in structural properties of suspensions exists already in the absence of electric field and significantly influences their electrorheological behavior after application of electric field. The formation of electrorheological structure has been monitored by recording time dependences of the shear stress and the electric current passing through the flowing suspensions.

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Acknowledgements

The authors thank the Ministry of Education, Youth and Sports of the Czech Republic (MSM 7088352101), the Grant Agency of the Czech Republic (202/09/1626), and the Grant Agency of the Academy of Sciences of the Czech Republic (IAA 400500905) for the financial support.

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Authors and Affiliations

  1. Tomas Bata University in Zlin, Faculty of Technology, TGM 275, 762 72, Zlin, Czech Republic

    Martin Stěnička, Vladimír Pavlínek & Petr Sáha

  2. Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovsky Sq. 2, 162 06, Prague 6, Czech Republic

    Natalia V. Blinova, Jaroslav Stejskal & Otakar Quadrat

Authors
  1. Martin Stěnička
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  2. Vladimír Pavlínek
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  3. Petr Sáha
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  4. Natalia V. Blinova
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  5. Jaroslav Stejskal
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  6. Otakar Quadrat
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Correspondence to Martin Stěnička.

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Stěnička, M., Pavlínek, V., Sáha, P. et al. Structure changes of electrorheological fluids based on polyaniline particles with various hydrophilicities and time dependence of shear stress and conductivity during flow. Colloid Polym Sci 289, 409–414 (2011). https://doi.org/10.1007/s00396-010-2357-9

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  • DOI: https://doi.org/10.1007/s00396-010-2357-9

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