期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 419, 期 -, 页码 46-51出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2013.12.045
关键词
Colloids; Iron oxide nanoparticles; Oleic acid; Sodium citrate; Triton X-100; Surfactants; Magnetic characterization; Magnetite; Stability; UV-VIS
资金
- FCT-MEC through Strategic PEst-C/CTM/LA0025/2013-2014 project
- FCT for PhD grant [SFRH/ BD/81711/2011, SFRH/BD/84628/2012]
Iron oxide nanoparticles are having been extensively investigated for several biomedical applications such as hyperthermia and magnetic resonance imaging. However, one of the biggest problems of these nanoparticles is their aggregation. Taking this into account, in this study the influence of three different surfactants (oleic acid, sodium citrate and Triton X-100) each one with various concentrations in the colloidal solutions stability was analyzed by using a rapid and facile method, the variation in the optical absorbance along time. The synthesized nanoparticles through chemical precipitation showed an average size of 9 nm and a narrow size distribution. X-ray diffraction pattern and Fourier Transform Infrared analysis confirmed the presence of pure magnetite. SQUID measurements showed superparamagnetic properties with a blocking temperature around 155 K. In addition it was observed that neither sodium citrate nor Triton X-100 influences the magnetic properties of the nanoparticles. On the other hand, oleic acid in a concentration of 64 mM decreases the saturation magnetization from 67 to 45 emu/g. Oleic acid exhibits a good performance as stabilizer of the iron oxide nanoparticles in an aqueous solution for 24 h, for concentrations that lead to the formation of the double layer. (C) 2013 Elsevier Inc. All rights reserved.
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