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首页> 外文会议>The 10th International Conference on Ferrites（2008中国国际铁氧体研讨会）论文集 >Absorption of Carboxylic on Nanosized Magnetic Particles Using In-situ Infrared Spectroscopy
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Absorption of Carboxylic on Nanosized Magnetic Particles Using In-situ Infrared Spectroscopy

机译：原位红外光谱法在纳米级磁性颗粒上吸收羧酸

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Nanometer sized magnetic particles are attracting growing fundamental and technological interest because of their unique magnetic properties, which are dominated by superparamagnetism. A main problem relating to the stability of magnetic colloids is the difficulty of controlling the dispersion of magnetic nanoparticles inside a liquid medium. The aim of this work was the preparation of high-quality ferrofluids with a long-term stability, which will exhibit the highest economic potential in different segments of technology and medicine. In this regard, superparamagnetic maghemite (γ-Fe203) nanoparticles with an average particle size of around (12 ± 2) nm were prepared, using homogenous coprecipitation method. In this method metal hydroxides were precipitated during the reaction between the solution of a precipitating reagent and an aqueous solution of metal salts. An oxidation was performed to obtain maghemite nanoparticles with spinel structure. Further,maghemite nanoparticles were surface treated with oleic and linoleic acids and dispersed in an organic carrier liquid to obtain stable organic-based ferrofluid of a high specific magnetization. The coating process was followed by in-situ infrared spectroscopy (React/R) and conductivity measurements.Samples prepared in this method were characterized using transmission electron microscopy (TEM), X-ray diffractometry (XRD) and specific surface area measurements (BET). A specific magnetization was also measured as a function of applied field at room temperature.
机译：纳米尺寸的磁性粒子因其独特的磁性而吸引了越来越多的基础和技术兴趣，而超顺磁性主导了它们。与磁性胶体的稳定性有关的主要问题是难以控制磁性纳米颗粒在液体介质内的分散。这项工作的目的是制备具有长期稳定性的高质量铁磁流体，它将在技术和医学的不同领域展现出最高的经济潜力。就这一点而言，使用均相共沉淀法制备了平均粒径约为（12±2）nm的超顺磁磁赤铁矿（γ-Fe203）纳米粒子。在该方法中，在沉淀试剂的溶液与金属盐的水溶液之间的反应期间使金属氢氧化物沉淀。进行氧化以获得具有尖晶石结构的磁赤铁矿纳米颗粒。此外，将磁赤铁矿纳米颗粒用油酸和亚油酸进行表面处理，并分散在有机载液中，以获得具有高比磁化强度的稳定的有机基铁磁流体。涂覆过程之后进行原位红外光谱（React / R）和电导率测量。使用透射电子显微镜（TEM），X射线衍射（XRD）和比表面积测量（BET）对用这种方法制备的样品进行表征。还测量了比磁化强度与室温下施加磁场的关系。

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