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Preparation of FeNP/CpG particles. a Equation of synthesis of Fe3O4 magnetic particles using the co-precipitation method. b Hydrolysis and condensation reactions with production of silane polymer and silanization reaction of APTES on the magnetite surface to form FeNP particles. c Schematic diagram of the FeNP/CpG particles. CpG are bound to the surface of the FeNPs through electrostatic interactions to form FeNP/CpG particles
