Study On Preparation And Shape Contral Of Nanostructure Zirconia

The particle morphology has great effects on the properties of nano-zirconia, so it's very significant to control the morphology of zirconia in use. As we all known that the morphology includes two parts, the particle size and the particle shape. The goal of the article is that compared to the methods of the preparation and control the nanoparitcles used today, The main work is to develop a new technology and reactive system to control the particle size and the particle shape of the nanozirconia. The products are characterized by several measure methods.The researches are as follows:1. The harmonious precipitation method and orthogonal experimental design is used in the experiments to study the effects of the experimental conditions such as the reactant concentration, the adding ratio of the reactant and the aging time on the products. In the experiments, we have prepared some zirconia which particle size is in a range from 10 to 20nm and the particle size is narrowly distributed by adding a kind of surfactant through the azeoptropic distillation.2. The spheroidicity zirconia is prepared by controlling the reactive temperatures, the precipitant reagents and adding additives through a alcohols solvent precipitation method. The effects of the solvents, additives, reaction temperatures and reactant concentrations on the nucleation of the nanoparticles and formation of the spheroidicity zirconia are discussed detailedly. A conclusion that EDTA has a decisive effect in the formation of the morphology of the zirconia is drawn in the experimats.3. A claviform zirconia is synthesized through a complexation method. The length and thickness can be controlled by altering the reaction temperatures and the reactant concentrations and the precipitant reagents. The effects of these experimental conditions are also studied in detail. The key factor of preparation of claviform zirconia is adding mount of EDTA and the optimal adding mount is a ratio of 1:1 to the deposited substance.4. A complex structural dendrite crystal Zr(OH)_x/NH₄Cl is prepared through a dydro-thermal-harmonious precipitation method. The sample is characterized by some measuremethods and the formation mechanism of the sample is indicated that NH4CI has the decisive effect on the formation of this product.