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Synthesis of Fe3O4 nanoparticles from emulsions
Abstract
A unique oil-in-water emulsion route has been devised to synthesize nanosized magnetite (Fe3O4) particles using a small amount of cyclohexane as the oil phase, NP5 + NP9 as the surfactant phase, and a Fe(II)/Fe(III) salt solution as the aqueous phase. The Fe3O4 powder thus derived from the emulsion containing 88 wt% 0.3 M FeSO4 + Fe(NO3)3 in the aqueous phase possesses an equiaxial morphology and an average particle size of <10 nm. Studies on the electrical conductivity of the emulsions as a function of Fe2+/Fe3+ concentration in the aqueous phase revealed the complexation effect of the NP5 + NP9 surfactant towards Fe2+/Fe3+ ions. The resulting particle size and morphology are therefore dependent on the amounts of surfactant and aqueous phase in the emulsion. A strongly alkaline aqueous phase favors the formation of Fe3O4, while a low alkalinity favors the formation of α-FeOOH. Magnetic property measurements and Mössbauer spectroscopic studies indicate that the emulsion-derived iron oxide powder is superparamagnetic, which becomes ferrimagnetic with decreasing measurement temperature.
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Cited by
Biological applications of magnetic nanoparticles
Colombo, M., Carregal-Romero, S., Casula, M. F., Gutiérrez, L., Morales, M. P., Böhm, I. B., Heverhagen, J. T., Prosperi, D., & Parak, W. J. (2012) · Chemical Society Reviews · doi:10.1039/c2cs15337h · Cited by 1,315
Lee, Y., Lee, J., Bae, C. J., Park, J. ‐., Noh, H. ‐., Park, J. ‐., & Hyeon, T. (2005) · Advanced Functional Materials · doi:10.1002/adfm.200400187 · Cited by 419
Synthesis of magnetite (Fe3O4) nanoparticles without surfactants at room temperature
Martínez-Mera, I., Espinosa-Pesqueira, M. E., Pérez-Hernández, R., & Arenas-Alatorre, J. (2007) · Materials Letters · doi:10.1016/j.matlet.2007.02.018 · Cited by 256
Metadata
- Authors
- Zhou, Z. H., Wang, J., Liu, X., & Chan, H. S. O.
- Venue
- Journal of Materials Chemistry
- Publisher
- Royal Society of Chemistry (RSC)
- Published
- 2001
- Volume
- 11
- Issue
- 6
- Pages
- 1704-1709
- ISSN
- 0959-9428 (ISSN-L)
- 1364-5501
- OpenAlex
- W2067616242
- Cited by
- 220
- References
- 0
- FWCI
- 4.04
- Type
- journal article
- Language
- en
- Open access
- closed
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- Zhou, Z. H., Wang, J., Liu, X., & Chan, H. S. O. (2001). Synthesis of Fe3O4 nanoparticles from emulsions. Journal of Materials Chemistry. https://doi.org/10.1039/b100758k
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