Contenido principal del artículo
Increased attention has been paid to the synthesis of hematite nanoparticles recently due to its properties and application in various fields of modern technology. The aqueous route has been found to be simpler and more versatile than the non-aqueous routes. In this study nanopowder of a-Fe2O3 (hematite) were synthesized by controlled precipitation method in three stages: precipitation of precursors, washing and calcination. The precipitation was controlled with ferric chloride as precursor, and sodium hydroxide as precipitant, in constant agitation and pH 6. It tested different reaction times: 1 and 2 days, and after 2 day of reaction it was concluded that it is possible to obtain hematite. The products obtained from the reaction were washed by centrifugation, dried at 80 ◦C, and were calcined at temperature of 425 ◦C, for four hours. To characterize the product obtained in the synthesis, it has been used FT-IR, SEM and RAMAN techniques. Samples with two days of reaction, washed and calcination at 425 ◦C are associated a mixture of hematite and magnetite and maghemite, with nearly morphology from plate-like shaped sphere and aggregates are formed by hemispherical primary particles whose size, apparently, is on the order of nanometers.
Detalles del artículo
L. Huo, W. Li, L. Lu, H. Cui, S. Xi, J. Wang, B. Zhao, Y. Shen, and Z. Lu,. Preparation, structure, and properties of threedimensional ordered α-Fe2O3 nanoparticulate film. Chem. Mater. Vol. 12, No. 3, pp. 790, 2000.
R.H. Kodama, S.A. Makholoufand, and A.E. Berkowitz. Finite size effects in antiferromagnetic NiO nanoparticles. Phys. Rev. Lett. Vol. 79, No. 7, pp. 1393-1396, 1997
W.T. Dong, and C.S. Zhu. Use of ethylene oxide in the sol–gel synthesis of α-Fe2O3 nanoparticles from Fe(III) salts. J. Mater. Chem. Vol.12, No.(6), pp.1676, 2002
A. Prakash, A.V. McCormick, and M.R. Zachariah. Aero-Sol−Gel synthesis of nanoporous iron-oxide particles: A potential oxidizer for nanoenergetic materials. Chem. Mater. Vol. 16, No. 8, pp. 1466-1471, 2004
A.K. Gupta, and M. Gupta. Synthesis and surface engineering of iron oxide nanoparticles for biomedical applications. Biomaterials Vol. 26, No. 18, pp. 3995-4021, 2005.
A. Figuerola, R.D. Corato, L. Manna, and T. Pellegrino. From iron oxide nanoparticles towards advanced iron-based inorganic materials designed for biomedical applications. Pharmacological Research Vol. 62, No. 2, pp. 126-143, 2010
M.J. Espı´n, A.V. Delgado, J.E. Martin. Effects of electric fields and volume fraction on the rheology of hematite/silicone oil suspensions. Rheol Acta. Vol. 44, pp. 71–79, 2004
S. Pandey, S. Misha. Sol–gel derived organic–inorganic hybrid materials: synthesis, characterizations and applications. J. Sol-Gel Sci. Technol. 59, 73–94, 2011
H. Karami. Synthesis and Characterization of Iron Oxide Nanoparticles by Solid State Chemical Reaction Method. J. Cluster Sci. 21, 11–20, 2010
J. Rockenberger, E.C. Scher, A.P. Alivisatos, A New Nonhydrolytic Single-Precursor Approach to Surfactant-Capped Nanocrystals of Transition Metal Oxides, J. Am. Chem. Soc. 121 11595, 1999
R. Perry, D. Green, J. Maloney, Manual del Ingeniero Químico, 7ma edición, Editorial McGraw Hill, 1, Madrid, España, pp. 18, 171, 197, 2001.
U. Schwertmann and R. Cornell, Iron Oxides in the Laboratory - Preparation and Characterization, 2da Edition, Editorial John Wiley y Sons, Ltd., Weinheim, Germany, pp. 60-65, 122-128, 2000.
M. Farahmandjou and F. Soflaee, Synthesis and Characterization of α-Fe2O3 Nanoparticles by Simple Co-Precipitation Method, Phys. Chem. Res., Vol. 3, No. 3, 191-196, 2015
B. Zhao, Y. Wang, H. Guo, J. Wang, Y. He, Z. Jiao, M. Wu, Iron oxide(III) nanoparticles fabricated by electron beam irradiation method. Materials Science Poland Vol. 25, No. 4, pp. 1143-1148, 2007.
T. Kim Il, G. A. Nunnery, K. Jacob, J. Schwartz, X. Liu, and R. Tannenbaum,. Synthesis, characterization, and alignment of magnetic carbon nanotubes tethered with maghemite nanoparticles. J. Phys. Chem. C Vol.114, No.15, pp. 6944–6951, 2010
A. M. Jubb and H. C. Allen, Vibrational spectroscopic characterization of hematite, maghemite, and magnetite thin films produced by vapor deposition, ACS Applied Materials and Interfaces, Vol. 2, No. 10, pp. 2804–2812, 2010
N. Buzgar, A. I. Apopei, A. Buzatu, Romanian Database of Raman Spectroscopy (online), available at http://rdrs.uaic.ro/contact.html.
D.L.A. de Faria, S. Venancio Silva, M.T. de, Oliveira, Raman microscopy of some iron oxides and oxyhydroxides, J. Raman Spectrosc. 28 873–878, 1997
X. Su, C. Yu, C. Qiang, Synthesis of Fe2O3 nanobelts and nanoflakes by thermal oxidation and study to their magnetic properties, Appl. Surf. Sci. 257, 9014–9018, 2011.