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Stable magnetic nanofluids containing Fe 3 O 4 @Polypyrrole (PPy) nanoparticles (NPs) were prepared by using a facile and novel method, in which one-pot route was used. FeCl 3 ·6H 2 O was applied as the iron source, and the oxidizing agent to produce PPy. Trisodium citrate (Na 3 cit) was used as the reducing reagent to form Fe 3 O 4  NPs. The as-prepared nanofluid can keep long-term stability. The Fe 3 O 4 @PPy NPs can still keep dispersing well after the nanofluid has been standing for 1 month and no sedimentation is found. The polymerization reaction of the pyrrole monomers took place with Fe 3+  ions as the initiator, in which these Fe 3+  ions remained in the solution adsorbed on the surface of the Fe 3 O 4  NPs. Thus, the core-shell NPs of Fe 3 O 4 @PPy were obtained. The particle size of the as-prepared Fe 3 O 4 @PPy can be easily controlled from 7 to 30 nm by the polymerization reaction of the pyrrole monomers. The steric stabilization and weight of the NPs affect the stability of the nanofluids. The as-prepared Fe 3 O 4 @PPy NPs exhibit superparamagnetic behavior.

Preparation of stable magnetic nanofluids containing Fe3O4@PPy nanoparticles by a novel one-pot route