Characterization and sinterability of nanophase titania particles processed in f

2019-05-22 00:14:03

processing materials particles AT titania

责任者: Yang, Guixiang;Zhuang, Haoren;Biswas, Pratim 单位: Univ of Cincinnati, Cincinnati, OH, USA 来源出处: Nanostructured Materials,1996,7(6):675-689 摘要: Flame aerosol reactors are a route for large scale processing of nanostructured materials. However, fundamentals about processing-structure-property relationships have not been extensively researched. This work utilized three different burners to obtain a wide range of flame processing conditions (different time-temperature histories) to study the formation of nanophase titania particles. At low precursor reaction temperatures of about 400 °C, amorphous titania was obtained. At intermediate temperatures of 900 to approximately 1430 °C, mixtures of anatase and rutile phase titania were obtained. At high temperatures of 1500 to approximately 1570 °C, spherical particles of 100% anatase titania were obtained. A qualitative explanation of the different phase formation has been provided. Transmission Electron Microscopy was used to study particle morphology, size and agglomeration. Sizes of the titania particles produced by the designed burners varied from 10 to 100 nm, depending on processing conditions. In situ light scattering measurements were made to examine the evolution of the particle sizes. Post-sintering experiments were carried out to illustrate superior sinterability of the nanophase titania powders. 关键词: Nanostructured materials;Titanium dioxide;Characterization;Phase transitions;Morphology;Particles (particulate matter);Particle size analysis;Agglomeration;Crystal microstructure;Amorphous materials;Light scattering;Transmission electron microscopy;Sintering;Sinterability;Flame aerosol reactors