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

Zhao B, Nan Z - Nanoscale Res Lett (2011)

Bottom Line: Trisodium citrate (Na3cit) was used as the reducing reagent to form Fe3O4 NPs.The Fe3O4@PPy NPs can still keep dispersing well after the nanofluid has been standing for 1 month and no sedimentation is found.The as-prepared Fe3O4@PPy NPs exhibit superparamagnetic behavior.

View Article: PubMed Central - HTML - PubMed

Affiliation: College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, 225002, People's Republic of China. zdnan@yzu.edu.cn.

ABSTRACT
Stable magnetic nanofluids containing Fe3O4@Polypyrrole (PPy) nanoparticles (NPs) were prepared by using a facile and novel method, in which one-pot route was used. FeCl3·6H2O was applied as the iron source, and the oxidizing agent to produce PPy. Trisodium citrate (Na3cit) was used as the reducing reagent to form Fe3O4 NPs. The as-prepared nanofluid can keep long-term stability. The Fe3O4@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 Fe3+ ions as the initiator, in which these Fe3+ ions remained in the solution adsorbed on the surface of the Fe3O4 NPs. Thus, the core-shell NPs of Fe3O4@PPy were obtained. The particle size of the as-prepared Fe3O4@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 Fe3O4@PPy NPs exhibit superparamagnetic behavior.

No MeSH data available.


Magnetization curve of the Fe3O4@PPy prepared under different amounts of pyrrole monomer at 160°C: (A) 0 mL, (B) 0.1 mL, (C) 0.3 mL, (D) 0.5 mL.
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Figure 6: Magnetization curve of the Fe3O4@PPy prepared under different amounts of pyrrole monomer at 160°C: (A) 0 mL, (B) 0.1 mL, (C) 0.3 mL, (D) 0.5 mL.

Mentions: Magnetic properties of the as-prepared products were investigated by a VSM at room temperature in the applied magnetic field from -8 to 8 KOe. The hysteresis loops of the Fe3O4@PPy NPs are shown in Figure 6. The products showed typical superparamagnetic behavior with negligible coercivity and remanence. Superparamagnetic behavior is often observed at room temperature with Fe3O4 NPs smaller than 20 nm [18,19]. In order to study the effect of the PPy shell on magnetic property of the samples, the hysteresis loop of the Fe3O4 NPs is shown as Figure 6A, in which the Fe3O4 NPs were prepared without any pyrrole and other experimental conditions kept the same. The saturation magnetizations of the as-prepared products were determined to be 23.7, 22.4, 20.7, and 17.2 emu/g for the samples fabricated with 0, 0.1, 0.3, and 0.5 mL pyrrole, respectively. These data shown that the saturation magnetization became smaller with increase of pyrrole added into the reaction system, for which the shell of the as-prepared shell-core samples became thicker with increase of pyrrole. These results demonstrated that Fe3O4@PPy NPs were produced.


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

Zhao B, Nan Z - Nanoscale Res Lett (2011)

Magnetization curve of the Fe3O4@PPy prepared under different amounts of pyrrole monomer at 160°C: (A) 0 mL, (B) 0.1 mL, (C) 0.3 mL, (D) 0.5 mL.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211289&req=5

Figure 6: Magnetization curve of the Fe3O4@PPy prepared under different amounts of pyrrole monomer at 160°C: (A) 0 mL, (B) 0.1 mL, (C) 0.3 mL, (D) 0.5 mL.
Mentions: Magnetic properties of the as-prepared products were investigated by a VSM at room temperature in the applied magnetic field from -8 to 8 KOe. The hysteresis loops of the Fe3O4@PPy NPs are shown in Figure 6. The products showed typical superparamagnetic behavior with negligible coercivity and remanence. Superparamagnetic behavior is often observed at room temperature with Fe3O4 NPs smaller than 20 nm [18,19]. In order to study the effect of the PPy shell on magnetic property of the samples, the hysteresis loop of the Fe3O4 NPs is shown as Figure 6A, in which the Fe3O4 NPs were prepared without any pyrrole and other experimental conditions kept the same. The saturation magnetizations of the as-prepared products were determined to be 23.7, 22.4, 20.7, and 17.2 emu/g for the samples fabricated with 0, 0.1, 0.3, and 0.5 mL pyrrole, respectively. These data shown that the saturation magnetization became smaller with increase of pyrrole added into the reaction system, for which the shell of the as-prepared shell-core samples became thicker with increase of pyrrole. These results demonstrated that Fe3O4@PPy NPs were produced.

Bottom Line: Trisodium citrate (Na3cit) was used as the reducing reagent to form Fe3O4 NPs.The Fe3O4@PPy NPs can still keep dispersing well after the nanofluid has been standing for 1 month and no sedimentation is found.The as-prepared Fe3O4@PPy NPs exhibit superparamagnetic behavior.

View Article: PubMed Central - HTML - PubMed

Affiliation: College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, 225002, People's Republic of China. zdnan@yzu.edu.cn.

ABSTRACT
Stable magnetic nanofluids containing Fe3O4@Polypyrrole (PPy) nanoparticles (NPs) were prepared by using a facile and novel method, in which one-pot route was used. FeCl3·6H2O was applied as the iron source, and the oxidizing agent to produce PPy. Trisodium citrate (Na3cit) was used as the reducing reagent to form Fe3O4 NPs. The as-prepared nanofluid can keep long-term stability. The Fe3O4@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 Fe3+ ions as the initiator, in which these Fe3+ ions remained in the solution adsorbed on the surface of the Fe3O4 NPs. Thus, the core-shell NPs of Fe3O4@PPy were obtained. The particle size of the as-prepared Fe3O4@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 Fe3O4@PPy NPs exhibit superparamagnetic behavior.

No MeSH data available.