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A novel Au-Fe3O4 nanoparticles-based capillary column was fabricated by magnetic approach for open-tubular capillary electrochromatography (OT-CEC). The bifunctional dumbbell-like Janus Au-Fe3O4 nanoparticles (Au-Fe3O4 NPs) were prepared through a hydrothermal synthesis strategy, and the morphology was characterized by transmission electron microscopy (TEM). Multilayers Au-Fe3O4 NPs were easily coated onto the inner surface of silica capillary by an external magnetic field to generate andoi:10.2116/analsci.19p315 pmid:31656248 fatcat:e5gbf4uauzbv7m23ygqmj7k27a