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Key Words:GRAPHENE OXIDE; FABRICATION; MICROSPHERES; PERFORMANCE; GROWTH; FLUID
Abstract:Background: Electrorheological (ER) fluid is an important smart material that can respond to external electric field. The purpose of this work is to synthesize stronger ER nanomaterial. Method: In this work, small coral-like H2Ti2O5 particles were prepared by hydrothermal method, SiO2 was uniformly grown on H2Ti2O5 through controlled hydrolysis, and H2Ti2O5@SiO2 core-shell nanocomposite was synthesized and used as ER material. The morphological evolution, structure and chemical composition of materials were studied by Scanning electron microscope (SEM), Transmission electron microscope (TEM), X-ray powder diffractometer (XRD), Fourier transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS). At the same time, dielectric and ER measurement results confirm that H2Ti2O5@SiO2 core-shell-based ER fluid has higher polarization strength and proper dielectric relaxation, which improves interface polarization and ER characteristics. Results: The ER results show that the ER efficiency after SiO2 coating is significantly improved, especially under higher applied electric field strength: when the voltage is 3 kV and the shear rate is 0.1 s-1, the ER efficiency can reach 160.84. Dielectric spectroscopy results show that H2Ti2O5@SiO2 fluid has a fast response time and a large difference in dielectric constant. It is a promising ER fluid material. (c) 2021 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
Volume:129
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Translation or Not:no