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Facile template-free route to fabricate core–shell Fe3O4@PANI-SO3H urchin-like nanoparticles as reusable catalyst for Hantzsch reaction: change morphology upon sulfonation

Materials ScienceChange MorphologyChemical EngineeringCatalytic ApplicationEngineeringHeterogeneous CatalysisNanoheterogeneous CatalysisCatalysisHantzsch ReactionChemistryCatalyst PreparationTemplate-free Route