Synthesized palygorskite/polyaniline nanocomposite particles by oxidative polymerization and their electrorheology

• ATP/PANI nanocomposite is adopted as electrorheological (ER) material.
• ER property was measured using a rheometer and fitted using CCJ model.
• Its dielectric spectra examined by LCR meter were correlated with ER property.

Palygorskite (Pal) clay coated with semiconducting polyaniline (PANI) nanocomposite particles was prepared by oxidative polymerization using aniline monomer in the presence of Pal. The morphological characteristics of the synthesized Pal/PANI composite particles were examined by both field emission scanning electron microscopy and transmission electron microscopy. A rotational rheometer was also used to examine the rheological behavior of the Pal/PANI composite-based electrorheological (ER) fluid when the nanocomposite particles were dispersed in silicone oil. From its flow curve of shear stress vs. shear rate investigated under an applied electric field, the typical ER behavior of the Pal/PANI-based ER fluid was observed. In addition, polarizability and relaxation time of the ER system obtained from the dielectric spectra were well correlated with its ER performance.

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