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Analysis of the flow behavior of electrorheological fluids containing polypyrrole nanoparticles or polypyrrole/silica nanocomposite particles

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Abstract

A four-parameter model (Seo-Seo model) was used to analyze the flow behavior of some electrorheological (ER) fluids containing polypyrrole (PPy) nanoparticles, nanocomposite particles of conductive polypyrrole confined in mesoporous silica (MCM-41), and core-shell-structured SiO2/polypyrrole nanoparticles. The static yield stress predictions by the model were compared with the experimental data and dynamic yield stress obtained from the Bingham model and/or Cho-Choi-Jhon (CCJ) model. The static yield stress values were larger than the dynamic yield stress values. It was also found that the static yield stress of the polypyrrole suspension had a quadratic dependence on the electric field strength as predicted by the electric polarization model whereas those of the nanocomposite suspensions showed 1.5 power-law dependency. A master curve describing the yield stress data dependence on the electric field strength was obtained using a single-parameter scaling function to interpret the underlying mechanism of ER activity. A simple method for evaluating the activity mechanism criterion has been proposed and applied to the ER response of those three kinds of suspension. The results show that the critical electric field strength should be checked before the conduction mechanism is asserted, even if the yield stress plot shows 1.5 power-law dependence on the electric field strength.

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Funding

This work was supported by the Institute of Engineering Research at Seoul National University, the KRICT (Korea Research Institute of Chemical Technology) Fundamental Research Program, Korea National Research Foundation (BK21PLUS SNU Materials Division), and POSCO through the project of “RIAM Future Material Solution Center”. HJC appreciates the financial support from the National Research Foundation of Korea (2018R1A4A1025169).

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Author notes

  1. Youngwook P. Seo and Sangsok Han contributed equally to this work.

Authors and Affiliations

  1. Department of Materials Science and Engineering, College of Engineering, RIAM, Seoul National University, Seoul, 08826, South Korea

    Youngwook P. Seo, Sangsok Han, Jihun Kim & Yongsok Seo

  2. Department of Polymer Science and Engineering, Inha University, Incheon, 22212, South Korea

    Hyoung Jin Choi

Authors
  1. Youngwook P. Seo
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  2. Sangsok Han
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  3. Jihun Kim
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  4. Hyoung Jin Choi
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  5. Yongsok Seo
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Correspondence to Hyoung Jin Choi or Yongsok Seo.

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Seo, Y.P., Han, S., Kim, J. et al. Analysis of the flow behavior of electrorheological fluids containing polypyrrole nanoparticles or polypyrrole/silica nanocomposite particles. Rheol Acta 59, 415–423 (2020). https://doi.org/10.1007/s00397-020-01205-9

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