【摘要】 制备TiO₂和掺镧TiO₂-变压器油纳米流体,研究了流体的流变行为和电场调控特性.TiO₂和掺镧TiO₂均为锐钛矿型,平均粒径为18.7 nm.TiO₂和掺镧TiO₂纳米流体的零场粘度42.4 mPa·s,外观透明,存放六个月不发生沉降.在外加电场的激励下,未掺镧TiO₂纳米流体的粘度随着电场强度的增大而减小,而掺镧TiO₂纳米流体的粘度随着电场强度的提高而增大,镧的掺杂量为3%时粘度最大增幅为35%.掺镧纳米流体的介电损耗和介电常数明显增大,颗粒界面极化增强是流变性能改善的原因.更多还原

【Abstract】 The rheological and electrical dynamic control responses of TiO₂ nanofluids and La doped TiO₂ nanofluids have been investigated,respectively.The Ti02 nanoparticles were prepared via utilizing solvothermal method.The TiO₂ and La doped TiO₂ are anatase with the average size of 18.7 nm. The nanofluids are highly transparent and exhibit good stability.The viscosity of TiO₂ nanofluid was only 42.4 mPa·s without external field.When an external electric field is applied,the viscosity of TiO₂ nanofluid decreases as the strength of the electric field,whereas the viscosity of La doped nanofiuid is increased with the electric field.A maximum enhancement of 35% was obtained for 3% doped La nanofluid.The discrepancy of the electrorheology behavior between these two nanofluids is mainly due to the significant improvement of dielectric property of the La doped TiO₂.更多还原