Electric-rheological Properties of Nanometer Titania Doped with Europium oxide in Hydroxyl Silicone oil

Nanometer europium oxide-doped titania particles were synthesized and electro-rheological fluids (ERFs) were prepared by reactions of those particles and hydroxyl silicone oil. The characteristics of particles were studied by transmission electron microscope, energy spectrum analysis and X-ray diffiaction. The results show that europium oxide solid dissolve in titania and deposit on surface of titania, titania crystal become irregular and even particle size increase. Dielectric constant of titania is 3.25 and doped titania is 5.5. Viscosities and shear stresses of ERFs increase with electrical field increasing and all have critical field (2KV/mm),their viscosities are 4500 pa.s and 6340 pa.s, respectively(E= 3.5kv/mm). Shear stress of titania ERF change into 200 Pa from 50 Pa and that of doped titania ERF change into 800 Pa from 100 Pa when electrical field increased into 3 kv/mm from 0v/mm. Grafting reaction between particle and hydroxyl silicone oil improve stability ratio from 44% to 80 after 144 h.