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Related Experiment Videos

Improved electrorheological effect in polyaniline nanocomposite suspensions.

Yong Taik Lim1, Jong Hyeok Park, O Ok Park

  • 1Center for Advanced Functional Polymer, Department of Chemical Engineering, Korea Advanced Institute of Science and Technology, 373-1 Kusong-dong, Yusong-gu, Taejon, 305-701, Korea.

Journal of Colloid and Interface Science
|November 18, 2005
PubMed
Summary

Polyaniline (PANI)/clay composites significantly enhance electrorheological fluid (ERF) performance. These PANI-clay nanocomposites offer superior mechanical rigidity and yield stress compared to pure PANI in ERFs.

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Area of Science:

  • Materials Science
  • Polymer Science
  • Colloid Science

Background:

  • Electrorheological fluids (ERFs) are smart fluids whose apparent viscosity changes when subjected to an electric field.
  • Polyaniline (PANI) is a conducting polymer with potential applications in ERFs.
  • Clay nanoparticles can be used to enhance the properties of polymers and composites.

Purpose of the Study:

  • To prepare and characterize polyaniline (PANI)/clay composites for use as electrorheological fluids.
  • To investigate the effect of PANI-clay nanocomposite particles on the electrorheological properties of suspensions.
  • To elucidate the mechanism behind the enhanced yield behavior of PANI-based nanocomposite ERFs.

Main Methods:

  • PANI/clay nanocomposite particles were synthesized via in-situ polymerization of aniline on aminosilane-modified exfoliated clay.

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  • The PANI/clay composites were dispersed in silicon oil to form electrorheological fluids.
  • Electrorheological properties, specifically yield stress, were measured under varying electric fields.

    • Main Results:

    • The PANI/clay composites consisted of both PANI-clay nanocomposite particles and pure PANI particles.
    • The PANI-clay nanocomposite particles formed columnar structures under an electric field, enhancing mechanical rigidity.
    • The maximum yield stress of PANI/clay composite suspensions (15 wt%) reached 1.6 kPa at 3 kV/mm, a significant increase from pure PANI (300 Pa).

    Conclusions:

    • PANI/clay composites demonstrate significantly improved electrorheological performance compared to pure PANI.
    • The formation of columnar structures by PANI-clay nanocomposite particles under an electric field is key to enhanced mechanical rigidity.
    • The study proposes a mechanism to explain the yield behavior of these novel PANI-based nanocomposite electrorheological fluids.