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Shan, Z., Wu, Z., Chen, H., Zhang, Z.M., Zhou, Y., Wen, A.X., Oakes, K.D. and Servos, M.R. (2012) PCR-Ready Human DNA Extraction from Urine Samples Using Magnetic Nanoparticles. Journal of Chromatography B, 881-882, 63-68.

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• TITLE: Structural and Magnetic Properties of Monophasic Maghemite (γ-Fe2O3) Nanocrystalline Powder

  AUTHORS: Juan Adrián Ramos Guivar, Arturo Isaías Martínez, Ana Osorio Anaya, Luis De Los Santos Valladares, Lizbet León Félix, Angel Bustamante Dominguez

  KEYWORDS: Monophasic Nanomaghemite, Rietveld Refinement, TEM, SAED, M-H Loops, ZFC

  JOURNAL NAME: Advances in Nanoparticles, Vol.3 No.3, August 28, 2014

  ABSTRACT: Structural and magnetic studies of monophasic maghemite (γ-Fe2O3) magnetic nanocrystallites (MNCs) synthesized by the co-precipitation chemical route are reported in this paper. For the synthesis, a starting precursor of magnetite (Fe3O4) in basic medium was oxidized at room temperature by adjusting the pH = 3.5 at 80°C in an acidic medium without surfactants. X-ray diffraction (XRD) pattern shows widened peaks indicating nanometric size and Rietveld Refinement confirms only one single-phase assigned to γ-Fe2O3 MNCs. High Resolution Transmission Electron Microscopy (HR-TEM) demonstrates the formation of nanoparticles with diameter around D ≈ 6.8 ± 0.1 nm which is in good agreement with Rietveld Refinement (6.4 ± 1 nm). A selected area electron diffraction pattern was carried out to complement the study of the crystalline structure of the γ-Fe2O3 MNCs. M(H) measurements taken at different temperatures show almost zero coercivity and remanence indicating superparamagnetic domain and high magnetic saturation.