单分散钴纳米粒子的制备及其对二硝酰胺铵(ADN)的热分解作用

Preparation of monodispersed Co nanoparticles and its effect on the thermal decomposition of ammonium dinitramide

采用氢电弧等离子体法在惰性气氛中制备了单分散的高纯度纳米Co粉。利用透射电子显微镜(TEM)和相应选区电子衍射(SAED)、比表面吸附仪、X射线衍射(XRD)等手段对样品的粒度、形貌、比表面积、成分进行了表征。将纳米Co粉按不同比例与二硝酰胺铵(ADN)制成复合粒子,并用差热分析(DTA)考察了不同比例的纳米Co粉对ADN的热分解催化作用。结果表明,在ADN中加入纳米Co粉,可使ADN的分解峰温明显降低,比例越大,分解峰温的降低也越多,且表观分解热显著增大,说明纳米Co粉对ADN有较强的催化作用。

The monodispersed Co nanoparticles with high purity were successfully prepared by means of hydrogen arc plasma method in the inert atmosphere. The particle size, morphology, specific surface area and composition of the samples were characterized by transmission electron microscopy （TEM）, the corresponding selected area electron diffraction （SAED）, specific surface adsorber and X-ray diffraction （XRD）. The compound particles of Co nanoparticles and ADN with different ratio were prepared. The effect of different content of Co nanoparticles on the decomposition of ADN was investigated by DTA. The results show that the decomposition peak temperature of ADN decreases obviously due to the addition of Co nanoparticles. The more the addition of Co nanoparticles is, the more the decomposition peak temperature of ADN decreases, and the apparent decomposition heat of Co/ADN composition increases obviously,which indicates that the Co nanoparticles have excellent catalytic effect on ADN.