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首页> 外文会议>Conference on Active and passive smart structures and integrated systems; 20090309-12; San Diego, CA(US) >Ionic liquids as potential carriers of low viscosity magneto-rheological fluids
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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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摘要

Based on the latest investigations on the formulation of new magneto-rheological fluids, it is envisioned that the use of ionic liquids as carriers of magneto-rheological fluids will open new possibilities of applications for these smart fluids due to the fact that their physical and chemical properties can be fine-tuned in a broad range. This contribution addresses one potentially important advantage of magneto-rheological fluids which use ionic liquids as novel carriers. In connection with this, magneto-rheological fluids with a low viscosity in the off-state without compromising other properties of the formulations (e. g., sedimentation of the dispersed magnetic particles, liquid state of the carriers in a broad range of temperatures) are often required for specific applications. In this regard, ionic liquids of low viscosity can be 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 1-ethyl-3-methylimidazolium thiocyanate (a low viscosity ionic liquid) in the temperature range from 20 ℃ to 80 ℃. The experimental results have revealed that the apparent viscosity of the dispersion slightly changes with the temperature when a constant magnetic field is applied and its value mainly depends on the shear rate and the strength of the magnetic field. The viscosity of the dispersion remains practically unmodified with both the temperature and the magnetic field intensity as the magnetic saturation 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 an inverse behavior with temperature for a constant magnetic field.
机译：基于对新型磁流变液配方的最新研究，可以预见的是，由于离子液体的物理和化学性质，使用离子液体作为磁流变液的载体将为这些智能流体的应用开辟新的可能性。可以在广泛的范围内微调属性。这一贡献解决了使用离子液体作为新型载体的磁流变液的一个潜在的重要优势。与此相关，经常需要在关闭状态下具有低粘度而又不损害配方的其他性能（例如，分散的磁性颗粒的沉降，在宽温度范围内的载体的液态）的磁流变流体。针对特定应用。在这方面，低粘度的离子液体在这种磁流变流体的开发中可能非常有用。因此，该文献报道了在20℃至80℃的温度范围内，分散在离子液体1-乙基-3-甲基咪唑硫氰酸盐（一种低粘度离子液体）中的氧化铁（II，III）颗粒的磁流变特性。 。实验结果表明，当施加恒定磁场时，分散体的表观粘度随温度略有变化，其值主要取决于剪切速率和磁场强度。当达到材料的磁饱和时，分散体的粘度几乎不会随温度和磁场强度而改变。在这种情况下，粘度将仅取决于所施加的剪切速率。相反，对于恒定磁场，分散体的屈服应力值以及相应的剪切应力与剪切速率曲线显示出与温度成反比的行为。

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