Preparation of size-controlled nanoparticles of magnetite

resumo

Samples of ferrofluids containing chemically stabilized nanoparticles of magnetite (Fe3O4) with tetramethylammonium hydroxide (TMAOH) were prepared by a direct reduction-precipitation method. The influences of aging time and temperature on the size and monodispersion characteristics of the produced nanoparticles were investigated. Transmission electron microscopy, powder X-ray diffraction, Fourier-transform infrared, and magnetization measurements with applied magnetic field up to 2T were used to characterize the synthesized iron oxides. Raising the temperature of the synthesized material in autoclave affects positively the monodispersion of the nanoparticles, but it was not found to significantly influence the size itself of individual particles. (C) 2011 Elsevier B.V. All rights reserved.

palavras-chave

HIGHLY CRYSTALLINE; AQUEOUS-SOLUTIONS; NANOCRYSTALS; PARTICLES; WATER; SHAPE; PRECIPITATION; MECHANISM; ZEOLITES; FE3O4

categoria

Materials Science; Physics

autores

Andrade, AL; Valente, MA; Ferreira, JMF; Fabris, JD

nossos autores

agradecimentos

This work was supported by CNPq (including grant # 490096/2010-7) and FAPEMIG (including grant # PPM 00419/10) (Brazil), and by CICECO, University of Aveiro, Portugal. CAPES (Brazil) grants the Visiting Professor PVNS fellowship to JDF at UFVJM.

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