Pickering Emulsion Polymerized Polyaniline/Zinc-ferrite Composite Particles and Their Dual Electrorheological and Magnetorheological Responses

Joo Nyeon Kim; Yu Zhen Dong; Hyoung Jin Choi

doi:10.1021/acsomega.0c00585

Pickering Emulsion Polymerized Polyaniline/Zinc-ferrite Composite Particles and Their Dual Electrorheological and Magnetorheological Responses

ACS Omega. 2020 Mar 26;5(13):7675-7682. doi: 10.1021/acsomega.0c00585. eCollection 2020 Apr 7.

Authors

Joo Nyeon Kim¹, Yu Zhen Dong¹, Hyoung Jin Choi¹

Affiliation

¹ Department of Polymer Science and Engineering, Inha University, Incheon 22212, Korea.

Abstract

A functional raspberry-like core-shell composite particle consisting of a conducting polyaniline (PANI) core and magnetic zinc ferrite shell is synthesized by Pickering emulsion polymerization. The morphology and chemical structure of the PANI/zinc-ferrite composite are evaluated by scanning electron microscopy, transmission electron microscopy, and Fourier-transform infrared spectroscopy. An electrorheological/magnetorheological fluid consisting of the PANI/zinc-ferrite composite dispersed in silicone oil with a particle concentration of 5 vol % is fabricated. Its rheological characteristics under external electric and magnetic fields are investigated by using a rotational rheometer. Under the electric or magnetic field, the PANI/zinc-ferrite particles form chain-like structures, demonstrating a solid-like state.