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采用室温固相法合成了钼硅酸铵、钨硅酸铵两种纳米颗粒 ,用元素分析确定其分子组成 ,它们的结构、性质、颗粒大小、表面形状分别用红外光谱、X -射线粉末衍射、透射电镜和热分析进行了研究 .结果表明 ,两种纳米颗粒的大小分别在 30nm和 4 0nm左右 ,长期放置易发生团聚 ,在水和无水乙醇中呈乳液分布 ,形成纳米颗粒后 ,两种杂多阴离子的热稳定性均明显降低
Two kinds of nanoparticles of ammonium molybdosilicate and ammonium tungstosilicate were synthesized by solid state reaction at room temperature. Their molecular structures were determined by elemental analysis. Their structures, properties, particle size and surface shape were characterized by FTIR, X - ray powder diffraction , Transmission electron microscopy (TEM) and thermal analysis.The results show that the size of the two nanoparticles are about 30nm and 40nm, respectively, and they are easy to agglomerate after being placed for a long time, and are in emulsion distribution in water and ethanol. After the nanoparticles are formed, The thermal stability of heteropolyanions are significantly reduced