纳米二氧化钛粉体的气相爆轰制备

 介绍了利用氢氧混合气体为原料、以四氯化钛为前驱体、气相爆轰制备纳米二氧化钛粉体的方法。利用XRD衍射结果分析证明，产物为金红石相和锐钛矿相的二氧化钛混晶，其晶粒尺度为纳米量级。通过XRD、SEM、TEM分析可以得出，粒子基本为球形，大部分粒子粒径为10~20 nm，也有少量的100 nm左右的粒子产生。分析后发现，反应发生在爆燃转爆轰的过程中和爆轰管中的湍流现象是导致大粒子产生的主要原因。在对在氢过量和氧过量两种状况下，对爆轰所产生的产物的形貌进行了对比，分析发现两种状况产生纳米二氧化钛粉末粒径分布和形貌并没有太大变化。

Nano-Titanium Dioxide Synthesis Using Gaseous Detonation

TiO2 nanoparticles are prepared by detonation method in gas phase.In this experiment,titanium tetrachloride is used as a precursor,and premixed gas(O2 and H2) as energy.Properties of TiO2 ultrafine particles were studied by means of XRD,SEM and TEM.The results show that the powders which are globose are rutile and anatase phase,and particle sizes of the powders are within 10 and 20 nm.There are also some larger particles which are about 100 nm.It is found that the production of larger particles is contributed to the deflagration-to-detonation course and the turbulent of detonation to grow.In the paper,the property of particles synthesized under the over-H2 and over-O2 case were compared.The result showed that the morphology of particles produced by the two cases does not vary greatly.