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Materials 2013, 6(12), 5549-5567; doi:10.3390/ma6125549
Article

Room Temperature Co-Precipitation Synthesis of Magnetite Nanoparticles in a Large pH Window with Different Bases

1,2,* , 1,3
 and
1
Received: 6 September 2013 / Revised: 11 November 2013 / Accepted: 15 November 2013 / Published: 28 November 2013
(This article belongs to the Section Structure Analysis and Characterization)
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Abstract

Magnetite nanoparticles (Fe3O4) represent the most promising materials in medical applications. To favor high-drug or enzyme loading on the nanoparticles, they are incorporated into mesoporous materials to form a hybrid support with the consequent reduction of magnetization saturation. The direct synthesis of mesoporous structures appears to be of interest. To this end, magnetite nanoparticles have been synthesized using a one pot co-precipitation reaction at room temperature in the presence of different bases, such as NaOH, KOH or (C2H5)4NOH. Magnetite shows characteristics of superparamagnetism at room temperature and a saturation magnetization (Ms) value depending on both the crystal size and the degree of agglomeration of individual nanoparticles. Such agglomeration appears to be responsible for the formation of mesoporous structures, which are affected by the pH, the nature of alkali, the slow or fast addition of alkaline solution and the drying modality of synthesized powders.
Keywords: magnetite nanoparticles; co-precipitation; room temperature; superparamagnetism; aggregation; mesoporous structure magnetite nanoparticles; co-precipitation; room temperature; superparamagnetism; aggregation; mesoporous structure
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Mascolo, M.C.; Pei, Y.; Ring, T.A. Room Temperature Co-Precipitation Synthesis of Magnetite Nanoparticles in a Large pH Window with Different Bases. Materials 2013, 6, 5549-5567.

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