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Dynamic response of a graphene oxide-polyaniline composite suspension under an applied electric field

A suspension of semiconducting graphene oxide/polyaniline (GO/PANI) composite particles dispersed in silicone oil is considered as one of the potential candidates for an electrorheological (ER) fluid. The GO/PANI composite was synthesized by using chemical oxidation polymerization of aniline in the presence of a GO dispersion that contained GO that had been prepared by using a modified Hummers method. The characteristics of the composite were examined by using SEM images and FT-IR spectra and indicated the coexistence of GO and PANI in the composite. The GO/PANI-composite-based ER fluid was prepared by dispersing the fabricated particles in silicone oil, and its dynamic viscoelastic properties were measured using a rotational rheometer under different electric fields, which showed that the ER fluid exhibited typical solid-like ER behaviors.