爆轰合成氧化亚铁掺杂的二氧化硅包覆铁纳米颗粒

Detonation Synthesis of Ferrous Oxide Doped Silica Coated Iron Nanoparticles

用一定比例的硝酸铁盐、硅酸钠盐、无水乙醇与黑索金混合制成塑性炸药。在密闭容器中以氩气为保护气,通过爆轰合成氧化亚铁掺杂的二氧化硅包覆铁纳米颗粒。采用X射线衍射(XRD)、透射电镜(TEM)及振动样品磁强计(VSM)对爆轰产物的组成成分、形态结构以及磁性进行测试。实验结果表明,爆轰产物以金属颗粒为核、二氧化硅为包覆层的壳/核结构形式出现,颗粒尺寸在60nm左右。通过分析爆轰产物的磁性曲线可知,在室温下爆轰产物具有较高的剩磁比和矫顽力,表现出弱的铁磁性,是优良的储磁材料。

In present experiments,nitrate salts,sodium silicate,anhydrous ethanol and RDX were mixed with a certain proportion,and the detonation synthesis of FeO doped silica coating iron nano particles was completed in a closed container with argon as the protection gas.The composition,morphology and magnetic properties of the detonation products were tested by XRD（X-Ray Diffraction）,TEM（Transmission Electron Microscope）and VSM（Vibrating Sample Magnetometer）,respectively.Experimental results indicate that the metal particles are the core of the detonation products,and the silicon dioxide is the coating of the shell/core structure with the particle size of about 60 nm.And the analysis of the magnetic curve shows that the detonation products present weak ferromagnetism,high remanence and coercivity at room temperature,which should be regarded as an excellent magnetic storage material.