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Influence of liquid phase on nanoparticle-based giant electrorheological fluid

机译：液相对纳米颗粒巨电流变流体的影响

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摘要

We show that the chemical structures of silicone oils can have an important role in the giant electrorheological ( GER) effect. The interaction between silicone oils and solid nanoparticles is found to significantly influence the ER effect. By increasing the kinematic viscosity of silicone oils, which is a function of siloxane chain length, sol-like, gel-like and clay-like appearances of the constituted ER fluids were observed. Different functional-group-terminated silicone oils were also employed as the dispersing media. Significant differences of yield stress were found. We systematically study the effect of siloxane chain lengths on the permeability of oils traveling through the porous spaces between the particles ( using the Washburn method), oils adsorbed on the particles' surface ( using FT-IR spectra), as well as their particle size distribution ( using dynamic light scattering). Our results indicate the hydrogen bonds are instrumental in linking the silicone oil to GER solid particles, and long chain lengths can enhance the agglomeration of the GER nanoparticles to form large clusters. An optimal oil structure, with hydroxyl-terminated silicone oil and a suitable viscosity, was chosen which can create the highest yield stress of similar to 300 kPa under a 5 kV mm(-1) DC electric field.
机译：我们表明，硅油的化学结构可以在巨电流变（GER）效应中发挥重要作用。发现硅油和固体纳米颗粒之间的相互作用会显着影响ER效应。通过增加硅油的运动粘度，这是硅氧烷链长的函数，观察到所组成的ER流体的溶胶状，凝胶状和粘土状外观。不同官能团封端的硅油也被用作分散介质。发现屈服应力的显着差异。我们系统地研究了硅氧烷链长对通过颗粒之间的多孔空间的油的渗透性（使用Washburn方法），吸附在颗粒表面的油（使用FT-IR光谱）以及颗粒大小的影响分布（使用动态光散射）。我们的结果表明，氢键有助于将硅油与GER固体颗粒连接，长链长度可以增强GER纳米颗粒的团聚，形成大簇。选择具有羟基封端的硅油和合适粘度的最佳油结构，该结构在5 kV mm（-1）直流电场下可产生类似于300 kPa的最高屈服应力。

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