超顺磁性
吸光度
油酸
纳米颗粒
氧化铁纳米粒子
凝聚
磁铁矿
氧化铁
化学
水溶液
胶体
磁性纳米粒子
柠檬酸钠
化学工程
傅里叶变换红外光谱
肺表面活性物质
磁化
核化学
材料科学
纳米技术
色谱法
有机化学
医学
生物化学
物理
量子力学
病理
磁场
工程类
冶金
作者
Paula I. P. Soares,Ana M.R. Alves,Laura C. J. Pereira,Joana T. Coutinho,Isabel Ferreira,Carlos Novo,João Paulo Borges
标识
DOI:10.1016/j.jcis.2013.12.045
摘要
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.
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