硅油端基对草酸氧钛电流变液性能的影响

Effects of terminal group of silicone oil on properties of oxalate group-modified amorphous titanium oxide nanoparticles-based electrorheological fluids

以草酸氧钛纳米颗粒为分散相,以粘度相近、端基不同的硅油(羟基硅油、甲基含氢硅油、二甲基硅油)为基液制备电流变液,测试其剪切屈服强度、零场粘度、漏电流密度、剪切稳定性、沉降稳定性,以研究硅油端基结构对电流变液性能的影响。测试结果表明,以极性端基能够提高电流变液的剪切屈服强度、电流变效率及沉降稳定性,但导致漏电流密度增大;空间位阻作用较小的端基能够提高电流变液的剪切屈服强度、电流变效率,降低漏电流密度,但导致沉降稳定性变差。

Electrorheological （ER） fluids were fabricated by dispersing oxalate group-modified amorphous titani- um oxide nanoparticles in silicone oil with similar viscosity but different terminal groups （hydroxyl, hydrogen, and methyl）. The yield stress, zero-field viscosity, ER efficiency, leak current density, shear stability and sedi mentation stability was tested to find the influence of the terminal group of silicone oil on properties of ER flu ids. The results indicated that the ER fluids based on the silicone oil with polar terminated group presents im- proved yield stress, higher ER efficiency, and better sedimentation stability, but larger leakage current density, while the ER fluids based on the silicone oil with small terminated group presents higher yield stress, higher ER efficiency, and less leakage current density, but worse sedimentation stability.