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A novel method to prepare magnetic nanoparticles: precipitation in bicontinuous microemulsions

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Abstract

A novel method to prepare iron oxide nanoparticles by precipitation in bicontinuous microemulsions is reported. Precipitation reactions were carried out in microemulsions stabilized with a mixture of dodecyltrimethylammonium bromide/didodecyldimethylammonium bromide (3/2, w/w). Nanoparticles were characterized by X-ray diffraction, transmission electronic microscopy (TEM) and vibrating sample magnetometry (VSM), and consisted of magnetite or a mixture of magnetite and maghemite. The particles have an average diameter of 8 nm with a relatively narrow particle size distribution and show possible superparamagnetic behavior. Noticeably higher yields of precipitate are observed for this new approach in comparison with those typicall obtained using reverse microemulsions.

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Acknowledgment

CONACyT supported this research through grant SEP 2003-CO2-45436. Two of us (IAF and JE) acknowledge scholarships from CONACyT to pursue her Doctoral and MSc works, respectively. We are grateful to Selene Guzmán for her support in TEM measurements and Janet Valdés and Patricia Siller for their assistance in acquiring various specialized documents.

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Authors and Affiliations

  1. Centro de Investigación en Química Aplicada, Boul. Ing. Enrique Reyna No. 140, Saltillo, Coahuila, 25253, Mexico

    Jesús Esquivel, Isabel A. Facundo, M. Esther Treviño & Raúl G. López

  2. Facultad de Ciencias Químicas, Universidad Autónoma de Coahuila, Saltillo, Coahuila, 25240, Mexico

    Jesús Esquivel

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  1. Jesús Esquivel
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  2. Isabel A. Facundo
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  3. M. Esther Treviño
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  4. Raúl G. López
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Correspondence to Raúl G. López.

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Esquivel, J., Facundo, I.A., Treviño, M.E. et al. A novel method to prepare magnetic nanoparticles: precipitation in bicontinuous microemulsions. J Mater Sci 42, 9015–9020 (2007). https://doi.org/10.1007/s10853-007-1834-0

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  • DOI: https://doi.org/10.1007/s10853-007-1834-0

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