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Conductivity of flowing polyaniline suspensions in electric field

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Abstract

The formation of chain structures by polarized polyaniline (PANI) particles suspended in silicone oil in the electric field has been monitored by recording suspension conductivity in the course of time. For that purpose, three types of PANI particles differing in the conductivity (3.1 × 10−3, 1.7 × 10−1, and 2.0 × 10−1 S cm−1) have been chosen out of a series of nine samples prepared by controlled protonation of PANI base in orthophosphoric acid solutions. Relaxation times reflecting this process and characterizing the rate of the response to the electric field decreased with particle conductivity, indicating a higher polarizability of particles. At the same time, the maximum conductivity of suspension increased as a consequence of the electric and shear forces acting on the particles. In the shear fields, shorter relaxation times appeared than at rest. The simultaneous measurement of the shear stress confirmed that the conductivity investigation can reliably characterize the development of electrorheological structures.

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Acknowledgment

The authors thank the Ministry of Education, Youth and Sports of the Czech Republic (MSM—7088352101) and the Grant Agency of the Czech Republic (202/06/0419) for financial support.

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Authors and Affiliations

  1. Faculty of Technology, Tomas Bata University in Zlín, TGM Sq. 275, 762 72, Zlín, 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

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  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 Vladimír Pavlínek.

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Stěnička, M., Pavlínek, V., Sáha, P. et al. Conductivity of flowing polyaniline suspensions in electric field. Colloid Polym Sci 286, 1403–1409 (2008). https://doi.org/10.1007/s00396-008-1910-2

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  • DOI: https://doi.org/10.1007/s00396-008-1910-2

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