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Superseed . Ionic Liquid-based Ferrofluids

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Superseed . Ionic Liquid-based Ferrofluids

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  1. The figure shows TEM and electron diffraction data on the magnetite nanoparticles and the chemical structrure of the first ionic liquid, N-methyl-N-ethylimidazoliummethanesulfonate that was used as a liquid carrier for a ferrofluid. The photographs at the bottom of the slide show the distortion of the fluid when placed in a magnetic field of increasing strength (T is tesla).The thermal stability and non-volatility of the ionic liquid may make this type of ferrofluid applicable to situations that in which others may fail (e.g. space). Superseed. Ionic Liquid-based Ferrofluids The figure shows TEM and electron diffraction data on the magnetite nanoparticles and the chemical structrure of the first ionic liquid, N-methyl-N-ethylimidazoliummethanesulfonate that was used as a liquid carrier for a ferrofluid. The photographs at the bottom of the slide show the distortion of the fluid when placed in a magnetic field of increasing strength (T is tesla).The thermal stability and non-volatility of the ionic liquid may make this type of ferrofluid applicable to situations that in which others may fail (e.g. space). Ferrofluids are colloidal suspensions of ferromagnetic nanoparticles stabilized by a surfactant that is appropriate for the particle and solvent. Water and saturated hydrocarbon liquids are most often employed as liquid carriers and magnetite (Fe3O4) is the most common particle used. Due to the small size of the magnetite particles (~10 nm diameter), each has a single magnetic domain, they do not aggregate due to magnetic dipole interactions and they do not settle or sediment in gravitational or magnetic fields. In the absence of a magnetic field, ferrofluid behavior is indistinguishable from that of normal liquids. They flow, exhibit surface tension, conform to the shape of containers, rise in capillary tubes and form sessile drops, puddles and capillary bridges. Their behavior differs in a magnetic field: the entire ferrofluid sample can respond as a ferromagnetic liquid and be held in a particular location or moved, the viscosity can increase orders of magnitude, the liquid surface can distort to align with the magnetic field lines. (T.J. McCarthy and Pei Bian)

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