Superparamagnetic, High Magnetic α-Fe & α″-Fe16N2 Mixture Prepared from Inverse Suspension-Polymerized Fe3O4@polyaniline Composite

Yen-Zen Wang; Yu-Wei Cheng; Lin-Chia Ho; Wen-Yao Huang; Ko-Shan Ho; Yu-Ting Syu

doi:10.3390/polym13142380

Superparamagnetic, High Magnetic α-Fe & α″-Fe₁₆N₂ Mixture Prepared from Inverse Suspension-Polymerized Fe₃O₄@polyaniline Composite

Polymers (Basel). 2021 Jul 20;13(14):2380. doi: 10.3390/polym13142380.

Authors

Yen-Zen Wang¹, Yu-Wei Cheng², Lin-Chia Ho³, Wen-Yao Huang⁴, Ko-Shan Ho⁵, Yu-Ting Syu⁵

Affiliations

¹ Department of Chemical and Materials Engineering, National Yu-Lin University of Science & Technology, Yun-Lin 640301, Taiwan.
² Department of Chemical Engineering, Ming Chi University of Technology, New Taipei City 24301, Taiwan.
³ National Defense Medical Center, 161 Sec. 6 Minquan E. Rd., Neihu District, Taipei City 11490, Taiwan.
⁴ Department of Photonics, National Sun Yat-sen University, 70 Lienhai Rd., Kaohsiung 80424, Taiwan.
⁵ Department of Chemical and Materials Engineering, National Kaohsiung University of Science & Technology, 415 Chien-Kuo Rd., Kaohsiung 80782, Taiwan.

Abstract

Oleic acid (OA)-modified Fe₃O₄ 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″-Fe₁₆N₂ mixture with a superparamagnetic property and high saturated magnetization (SM) of 245 emu g^-1 at 950 °C calcination under the protection of carbonization materials (calcined PANI) and other iron-compounds (α″-Fe₁₆N₂). The SM of the calcined iron-composites slightly decreases to 232 emu g^-1 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.

Keywords: ferrite; inverse suspension polymerization; polyaniline; superparamagnetic; α″-Fe16N2.