摘要:以纳米Fe3O4颗粒为核,分别采用液相沉积法和溶胶-凝胶法两种方法将MnO2包覆在其上制备了Fe3O4/MnO2磁性复合颗粒,并借助XRD、TEM、FTIR和VSM等手段分别对纳米Fe3O4颗粒和两种复合颗粒进行表征。结果表明:采用液相沉积法进行包覆可生成以多个纳米Fe3O4颗粒为核、粒径约为200nm的近球形Fe3O4/MnO2磁性复合颗粒,其饱和磁化强度为24.4kA·m^-1;采用溶胶-凝胶法进行包覆则生成以单个纳米Fe3O4颗粒为核、粒径约为50nm的磁性复合颗粒,包覆层为絮状MnO2,其饱和磁化强度为16.5kA·m^-1。
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