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|Title:||Synthesis of Fe3O4 nanoparticles from emulsions|
|Authors:||Zhou, Z.H. |
|Citation:||Zhou, Z.H., Wang, J., Liu, X., Chan, H.S.O. (2001). Synthesis of Fe3O4 nanoparticles from emulsions. Journal of Materials Chemistry 11 (6) : 1704-1709. ScholarBank@NUS Repository. https://doi.org/10.1039/b100758k|
|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.|
|Source Title:||Journal of Materials Chemistry|
|Appears in Collections:||Staff Publications|
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