期刊
MATERIALS
卷 14, 期 11, 页码 -出版社
MDPI
DOI: 10.3390/ma14112900
关键词
magnetite; poly(o-anisidine); core-shell; electro-magneto-rheological; electrorheology
类别
资金
- National Research Foundation of Korea [2021R1A4A2001403]
Magnetic and semiconducting Fe3O4/POA core/shell composite particles were successfully fabricated, leading to the development of a smart electro-magneto-rheological suspension with functionalities of magnetism and conductivity. The electrorheological properties of the suspension were studied under different electric field strengths, revealing a solid-like behavior under the electric field, with the dynamic yield stress of the ER fluid increasing linearly with the electric field strength following a power-law function.
Magnetic and semiconducting Fe3O4/poly(o-anisidine) (POA) core/shell composite particles were fabricated by an oxidation process using Fe3O4 synthesized separately. The dispersion stability in a liquid medium and the electrical conductivity of synthesized particles were improved because of the conductive POA polymeric shell. The morphological, microstructural, compositional/elemental, and thermal behaviors of the particles were characterized using SEM with energy dispersive X-ray spectroscopy, TEM, XRD, and thermogravimetric analysis, respectively. A smart electro-magneto-rheological suspension containing Fe3O4/POA particles with two functionalities, magnetism and conductivity, was prepared. Its electrorheological properties were investigated at different electric field strengths using a rotational rheometer. Without an electric field, the sample demonstrated typical Newtonian fluid behavior, as expected. However, while under the electric field, it exhibited a solid-like behavior, and the dynamic (or elastic) yield stress of the ER fluid increased linearly as a function of the electric field strength in a power-law function with an index of 2.0, following the polarization mechanism.
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