Preparation And Electrorheological Properties Of Ti-O Particles By Electrostatic Spraying

Electrorheological fluid is composited by micro-nano-sized dielectric particles dispersed in the insulating liquid. Under the influence of applied electric field, the viscosity of the ER system increased rapidly. ER fluids can produce a yield stress to resist external shear deformation and changes in viscosity in the process of changing from a liquid into a solid state. In addition, the liquid-solid transition is reversible. Electrically controlled properties of ER fluid applications most widely used, mainly used in electro-rheological shock absorbers and other industrial devices. But there are also many drawbacks of ER material, such as poor stability, low shear strength defects. In this paper, electrostatic spraying technology is used for the first time during the preparation of the dispersed phase of electrorheological particles. It aimed at obtaining titanium oxide particles coated by surfactants network polyvinyl pyrrolidone (PVP). The core-shell structure serve to reduce particle size and particle surface-modified in order to improve the ER fluid shear strength and stability against settling.In this paper, successfully applied electrostatic spraying technology into the preparation of titanium oxide particles. In the experiment obtained fine and uniform titanium oxide core-shell structure particles coated by PVP, explore the electrostatic spraying process parameters include electric field strength, PVP concentration, the rate of fuel injection nozzle diameter, etc. on the influence of particle morphology and ER properties. Research indicates that: Electrostatic spraying compared with the conventional hydrolysis precipitation method. Particles prepared by electrostatic spraying are 200-300nm, uniform size, good dispersion, no reunion, and the method is relatively simple. In addition, the particles prepared by electrostatic spraying technology can effectively coated surfactant on the surface, improving the ER performance of dispersed particles. The particles prepared by conventional hydrolysis precipitation are 500-600nm and are easy to reunion. The shear strength and anti-settling properties of the particles prepared by electrostatic spraying were higher than the traditional hydrolysis precipitation method. Results in this paper have theoretical and practical significance for the development of electro-rheological fluid technology.