Versatile ferrofluids based on polyethylene glycol coated iron oxide nanoparticles

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• 作者：W. Brullot^a ; ^{ward.brullot@fys.kuleuven.be} ; ^{ward.brullot@gmail.com} ; N.K. Reddy^b ; J. Wouters^a ; V.K. Valev^a ; B. Goderis^a ; J. Vermant^b ; T. Verbiest^a
• 关键词：Ferrofluid ; Polyethylene glycol ; Magneto-optics ; Magnetite ; Rheology
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2012
• 期刊代码：31_03048853
• 类别：ph
• 出版时间：June, 2012
• 卷：324
• 期：11
• 页码：1919-1925
• 文件大小：810 K

摘要

Versatile ferrofluids based on polyethylene glycol coated iron oxide nanoparticles were obtained by a facile protocol and thoroughly characterized. Superparamagnetic iron oxide nanoparticles synthesized using a modified forced hydrolysis method were functionalized with polyethylene glycol silane (PEG silane), precipitated and dried. These functionalized particles are dispersable in a range of solvents and concentrations depending on the desired properties. Examples of tunable properties are magnetic behavior, optical and magneto-optical response, thermal features and rheological behavior. As such, PEG silane functionalized particles represent a platform for the development of new materials that have broad applicability in e.g. biomedical, industrial or photonic environments. Magnetic, optical, magneto-optical, thermal and rheological properties of several ferrofluids based on PEG coated particles with different concentrations of particles dispersed in low molecular mass polyethylene glycol were investigated, establishing the applicability of such materials.