Absorption of Carboxylic on Nanosized Magnetic Particles Using In-situ Infrared Spectroscopy
(0) 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.
A.(Z)nidar(s)ic A.Ko(s)ak A.Drmota
Kolektor Nanotesla Institute,Stegne 29,1000 Ljubljana,Slovenia Kolektor Magma d.o.o,Stegne 29,1000 Ljubljana,Slovenia Kolektor Nanotesla Institute,Stegne 29,1000 Ljubljana,Slovenia;Kolektor Magma d.o.o,Stegne 29,1000 L
国际会议
The 10th International Conference on Ferrites(2008中国国际铁氧体研讨会)
成都
英文
15-19
2008-10-10（万方平台首次上网日期，不代表论文的发表时间）