Superparamagnetic, High Magnetic α-Fe & α″-Fe<sub>16</sub>N<sub>2</sub> Mixture Prepared from Inverse Suspension-Polymerized Fe<sub>3</sub>O<sub>4</sub>@polyaniline Composite
Oleic acid (OA)-modified Fe<sub>3</sub>O<sub>4</sub> nanoparticles were successfully covered with polyanilines (PANIs) via inverse suspension polymerization in accordance with SEM and TEM micrographs. The obtained nanoparticles were able to develop into a ferrite (α-Fe) and α...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2021-07-01
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| Series: | Polymers |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2073-4360/13/14/2380 |
| Summary: | Oleic acid (OA)-modified Fe<sub>3</sub>O<sub>4</sub> nanoparticles were successfully covered with polyanilines (PANIs) via inverse suspension polymerization in accordance with SEM and TEM micrographs. The obtained nanoparticles were able to develop into a ferrite (α-Fe) and α″-Fe<sub>16</sub>N<sub>2</sub> mixture with a superparamagnetic property and high saturated magnetization (SM) of 245 emu g<sup>−1</sup> at 950 °C calcination under the protection of carbonization materials (calcined PANI) and other iron-compounds (α″-Fe<sub>16</sub>N<sub>2</sub>). The SM of the calcined iron-composites slightly decreases to 232 emu g<sup>−1</sup> after staying in the open air for 3 months. The calcined mixture composite can be ground into homogeneous powders without the segregation of the iron and carbon phases in the mortar without significantly losing magnetic activities. |
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| ISSN: | 2073-4360 |