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TiO2油基纳米流体的制备和流变性能
Synthesis and rheological properties of TiO2-oil nanofluids
【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.
【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.
【Key words】 inorganic non-metallic materials; TiO2 nanofluids; dope; rheological properties; electrical control;
- 【文献出处】 材料研究学报 ,Chinese Journal of Materials Research , 编辑部邮箱 ,2008年05期
- 【分类号】TB383.1
- 【被引频次】25
- 【下载频次】425