不同前驱体相对摩尔量对气相爆燃制备纳米SiO_2的影响

Study on the Influence of Gaseous Deflagration Preparing Nano-SiO_2 with Different Relative Mole Amounts of Precursor

以SiCl4为前驱体,以空气和氢气的混合气体为爆源,通过改变前驱体的相对摩尔量,考察前驱体的相对摩尔量对产物的影响。通过X射线荧光谱(XRF)、透射电子显微镜(TEM)和X射线衍射(XRD)等测试手段对纳米SiO2粉体进行表征及分析。通过XRF对产物进行成分分析,测得实验所得产物主要由SiO2组成,且纯度达到99.9%以上;由XRD分析得知,生成的SiO2产物属于典型的非晶态结构;由TEM图像可以看出,随着前驱体相对摩尔量的增加,所得到的产物粒子逐渐出现粘结,分散性下降,前驱体相对摩尔比应该控制在1.5以内。

Taking SiCl4 as the precursor and the mixtures of hydrogen and oxygen as the explosion source, the influence on the product was investigated by changing the relative molecular mass of pre- cursor. Through X-ray fluorescence （XRF）, X-ray diffraction （XRD） and transmission electron microscopy （TEM）,the structure, composition and size distribution of the detonation product were char- acterized and analyzed. The XRF characterization shows that the obtained product is mainly SiO2 and this product purity is above 99.9%. The XRD characterization indicateds that the nano-SiO2 powder belongs to the typical amorphous structure. The TEM images show that with the increasing of the rel- ative molecular mass of precursor, the product were bonding gradually and its dispersion was reduced. The relative mole ratio of precursors should be controlled within 1.5.