Rapid
Millifluidic Synthesis of Stable High Magnetic Moment FexCy Nanoparticles for
Hyperthermia
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Version 1 2020-06-11, 12:44Version 1 2020-06-11, 12:44
Posted on 2020-06-26 - 14:36
A millifluidic
reactor with a 0.76 mm internal diameter was utilized for the synthesis
of monodisperse, high magnetic moment, iron carbide (FexCy) nanoparticles by
thermal decomposition of iron pentacarbonyl (Fe(CO)5) in
1-octadecene in the presence of oleylamine at 22 min nominal residence
time. The effect of reaction conditions (temperature and pressure)
on the size, morphology, crystal structure, and magnetic properties
of the nanoparticles was investigated. The system developed facilitated
the thermal decomposition of precursor at reaction conditions (up
to 265 °C and 4 bar) that cannot be easily achieved in conventional
batch reactors. The degree of carbidization was enhanced by operating
at elevated temperature and pressure. The nanoparticles synthesized
in the flow reactor had size 9–18 nm and demonstrated high
saturation magnetization (up to 164 emu/gFe). They further
showed good stability against oxidation after 2 months of exposure
in air, retaining good saturation magnetization values with a change
of no more than 10% of the initial value. The heating ability of the
nanoparticles in an alternating magnetic field was comparable with
other ferrites reported in the literature, having intrinsic loss power
values up to 1.52 nHm2 kg–1.
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Loizou, Katerina; Mourdikoudis, Stefanos; Sergides, Andreas; Besenhard, Maximilian Otto; Sarafidis, Charalampos; Higashimine, Koichi; et al. (2020). Rapid
Millifluidic Synthesis of Stable High Magnetic Moment FexCy Nanoparticles for
Hyperthermia. ACS Publications. Collection. https://doi.org/10.1021/acsami.0c06192