Investigation of magnetite particle characteristics in relation to crystallization pathways

Date

2023-02-01

Author

Kristiansen, Andreas Bogen
Church, Nathan
Uçar, Şeniz

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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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Intense research on magnetite nanoparticles and their synthesis methods stems from being ideal candidates for a variety of technological applications that use their unique magnetic properties. Strict control of the magnetic properties of magnetite for its most efficient use can be acquired by controlling particle characteristics such as size, shape and crystallinity. Bioinspired pathways that follow multistep crystallization routes, combined with the use of regulatory additives offer versatile synthesis platforms for the precipitation of tailored magnetite nanoparticles. However, our ability to control particle characteristics is limited by our understanding of the crystal formation pathways. Here we show that by using bioinspired coprecipitation and introducing poly-ethylene glycol (PEG) as an additive, superparamagnetic magnetite particles with enhanced magnetization can be synthesized. The bioinspired coprecipitation method allows stepwise precipitation of metastable iron oxide phases prior to magnetite formation via slow titration of a base into a solution of iron precursors. The regulatory roles of ionic and non-ionic PEG additives on particle characteristics are correlated with their effects on the multistep particle formation pathway and the kinetics of magnetite crystallization via phase transformation.

Subject Keywords

Magnetite nanoparticles, Bioinspired synthesis, Supersaturation, Phase transformation, Coprecipitation, IRON-OXIDE NANOPARTICLES, BIOINSPIRED SYNTHESIS, FE3O4 NANOPARTICLES, SIZE-CONTROL, PRECIPITATION, FERRIHYDRITE, NUCLEATION, PROTEIN, GROWTH

URI

https://hdl.handle.net/11511/103007

Collections

Department of Metallurgical and Materials Engineering, Article