Magnetic-Responsive\nJanus Nanosheets with Catalytic\nProperties

Abstract

In this article,\nwe describe a method to fabricate magnetic-responsive\nJanus nanosheets with catalytic properties via the surface protection\nmethod. Fe₃O₄ nanoparticles and PW₁₂O₄₀^3–-based ionic liquid are located\non the two opposite sides of the Janus nanosheets, respectively. The\nJanus nanosheets are characterized by Fourier transform infrared,\nscanning electron microscopy, transmission electron microscopy, atomic\nforce microscopy, and ζ-potential analyses. They are used as\nrecyclable catalysts to the esterification reaction of methanol and\noleic acid for their magnetic-responsive and catalytic properties.\nThe esterification ratio is up to 80% and there is nearly no change\nwhen Fe₃O₄ nanoparticles/PW₁₂O₄₀^3–-based ionic liquid composite nanosheets\nwere recycled four times.