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.
Highlights
With the advance of technology, the requirement for fast and wireless charging becomes more and more urgent
Some of the hydroxyl groups are still present after esterification with Oleic acid (OA), as described in Figure 1 as Polymers 2021, 13, x FOR PEER REVIwEWell, indicating that some of the –OH groups remained intact after esterification and poly-5 of 19 merization
The remaining hydrophilicity of the nanocomposite makes it still dispersible in micelles before the polymerization mixing with anilinium monomers or staying in polymer droplets after polymerization, which was randomly dispersed in the hydrophobic toluene mTaabtrliex1. .TAhsesipgnomlyemnetsriozfaFtiToInR ospf eacntrilai.nium monomers after the addition of water-soluble initiator APS in the pr–eOseHnce of Fe3O4(OA) did not destroy the carb3o4n0y0l gcrmou−1ps of the ester that link the–OCAH3o,n–tCo Hth2e(Fsetr3eOtc4hsiunrgfa)ce of the nanoparticles eithe2r9, 0il0lu, s3t0r0at0incgmt−h1at the long hydrocarbon provided the ntaainlsoocfotmh–Cpe oO=sOAiteasrwe sitthillsfiomrmelyhycdornonpehctoebdictiotythaendFea3fOfin4 int1ya7nt5oo0pthcamertti−co1lleu’esnseurafnadcet.hIet large polymer drople–tCs =wCe–re still able to suspend in the solvent aft1e6r5p0oclymm−1erization
Summary
With the advance of technology, the requirement for fast and wireless charging becomes more and more urgent. The regular material that meets these requirements is magnetite (Fe3O4), which can be obtained from the sol-gel method [9] conducted at room temperature It demonstrates a superparamagnetic property, its low magnetization (around 100 emu g−1) shortens the wireless charging distance. The Fe3O4 particles prepared from the sol-gel method are usually hydrophilic materials with some –OH groups on the surfaces If it stays with anilinium monomers in the water, the prepared PANI molecules cannot cover most of the Fe3O4 particles that become very mobile in the water [19,20,21,22,23,24,25,26] due to the hydrophilicity. The paramagnetic properties of neat Fe3O4(OA) and various FeNCs were measured from a SQUID of Quantum Design MPMS-XL7 (San Diego, CA, USA)
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