The remarkable electrorheological behavior of amino-modified Metal-Organic Frameworks with enhanced interfacial polarization

Abstract

Herein, the amino-modified Metal-Organic Frameworks (MIL-125) were prepared by mixing two different ligands before and after the modification of polar groups (amino) under solvothermal reaction conditions. Through the design of substituted ratio of polar group (NH 2 ), the amino-modification, not only enhance the polarization ability of MIL-125, but also induce the rich pore and irregular shape due to the asymmetry of structure. The obtained amino-modified MIL-125 was then characterized in terms of their morphology, composition and structure, using X-ray diffraction analyzer (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), Brunauer-Emmett-Teller (BET) and dielectric analysis. The amino-modified MIL-125 retained the large specific surface area and low bulk density of the Metal-Organic Frameworks, and achieved charge redistribution and obtained additional polarization ability through the introduction of polar groups. Ultimately, the amino-modified MIL-125 exhibits a stronger level of polarization, which results in a pronounced electrorheological (ER) behavior of the ER fluids using it as the dispersed phase.