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Ionic liquids as potential carriers of low viscosity magneto-rheological fluids

机译：离子液体作为低粘度磁流变液的潜在载体

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Based on the latest investigations on the formulation of new magneto-rheological fluids, it is envisioned that the use ofionic liquids as carriers of magneto-rheological fluids will open new possibilities of applications for these smart fluidsdue to the fact that their physical and chemical properties can be fine-tuned in a broad range. This contribution addressesone potentially important advantage of magneto-rheological fluids which use ionic liquids as novel carriers. Inconnection with this, magneto-rheological fluids with a low viscosity in the off-state without compromising otherproperties of the formulations (e. g., sedimentation of the dispersed magnetic particles, liquid state of the carriers in abroad range of temperatures) are often required for specific applications. In this regard, ionic liquids of low viscosity canbe very useful in the development of such magneto-rheological fluids. Thus, this contribution reports on the magneto-rheological properties of iron(II, III) oxide particles dispersed in the ionic liquid l -ethyl-3-methylimidazoliumthiocyanate (a low viscosity ionic liquid) in the temperature range from 20 °C to 80 °C. The experimental results haverevealed that the apparent viscosity of the dispersion slightly changes with the temperature when a constant magneticfield is applied and its value mainly depends on the shear rate and the strength of the magnetic field. The viscosity of thedispersion remains practically unmodified with both the temperature and the magnetic field intensity as the magneticsaturation of the material is reached; in this regime the viscosity will only depend on the applied shear rate. In contrast,the yield stress values of the dispersion as well as the corresponding shear stress vs. shear rate curves have shown aninverse behavior with temperature for a constant magnetic field.
机译：基于对新型磁流变流体的制剂的最新调查，设想使用磁流变液的载体的使用液体将开辟这些智能流量的新可能性，以至于它们的物理和化学性质可以在广泛的范围内微调。该贡献解决了使用离子液体作为新型载体的磁流变液的潜在重要优点。用这种情况下加连，磁流变流体在断开状态下具有低粘度的粘度，而不会损害制剂的其他叠加（例如，分散的磁性颗粒的沉降，特定应用通常需要在国外的载体的载体的液态） 。在这方面，低粘度的离子液体可以非常有用于这种磁流变液的发展。因此，该贡献报告了分散在离子液体L-乙基-3-甲基咪唑硫代氰酸酯（低粘度离子液体）的铁（II，III）氧化物颗粒的磁流变性质在温度范围内的20℃至80°中C。实验结果已经过分缺血，当施加恒定磁场时，分散体的表观粘度随温度略有变化，并且其值主要取决于剪切速率和磁场的强度。随着达到材料的磁性化饱和度，通过温度和磁场强度仍未改进的粘度仍未改进;在这一制度中，粘度仅取决于所施加的剪切速率。相反，分散的屈服应力值以及相应的剪切应力与剪切速率曲线已经显示出具有恒定磁场的温度的突出行为。

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