The disclosure of magnetic ionic liquids (MILs) as stable dispersions of surface modified γ-Fe 2 O 3 or CoFe 2 O 4 nanoparticles (NPs) in the 1- n -butyl-3-methylimidazolium tetrafluoroborate (BMIBF 4 ) ionic liquid is reported. The magnetic NPs were characterized by X-ray powder diffraction, transmission electron microscopy, and Raman spectroscopy. The surface modified NPs have proved to form stable dispersions in BMIBF 4 in the absence of water and behave like a magnetic ionic liquid. The MILs have been characterized by Raman spectroscopy, magnetic measurements, and DSC. The stability of the magnetic NPs in BMIBF 4 is consistently explained by assuming the formation of a semiorganized protective layer composed of supramolecular aggregates in the form of [(BMI) 2 (BF 4 ) 3 ] − . A superparamagnetic behavior and saturation magnetization of ca. 18 emu/g for a sample containing 30% w/w maghemite NPs/BMIBF 4 have been inferred from static and dynamic magnetic measurements. DSC results have shown that the MIL composed of 30% w/w CoFe 2 O 4 NPs/BMIBF 4 remains a liquid phase down to −84 °C.
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Oliveira et al. (2009) studied this question.
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