【摘要】 以十六烷基三甲基溴化铵(CTAB)为表面活性剂,通过液相还原法成功制备磁性穗状钴颗粒。采用电子扫描显微镜(SEM)、能谱仪(EDS)、X射线衍射仪(XRD)与振动样品磁强计(VSM)对制备的钴颗粒进行表征。结果表明:添加CTAB时得到的穗状钴颗粒为片层结构,晶体结构以密排六方为主;而未添加CTAB时得到的是以面心立方为主的菜花状钴颗粒。片层结构穗状钴颗粒的比饱和磁化强度与矫顽力分别为116.17A·m2·kg-1与20.3kA·m-1,而菜花状钴颗粒的比饱和磁化强度及矫顽力分别为158.24A·m2·kg-1与9.174kA·m-1,分析认为这种差异可能是由钴颗粒粒径、磁晶各向异性、形状各向异性以及内部缺陷所导致。更多还原

【Abstract】 Using CTAB as surfactant active agent,the spicate cobalt particles were synthesized through liquid phase reduction method.The cobalt particles were characterized by scanning electron microscopy(SEM),energy disperse spectroscopy(EDS),the X-ray diffraction(XRD)and vibrating sample magnetometer(VSM),respectively.The results show that the spicate cobalt particles with CTAB are assembled by nanoplates,mainly composed by HCP structure,while the cobalt particles without CTAB are mainly composed by FCC structure.For the cobalt particles with CTAB,saturation magnetization and coercivity are 116.17A·m2·kg-1 and 20.3kA·m-1,respectively,while for the cobalt particles without CTAB,saturation magnetization and coercivity are 158.24A·m2·kg-1 and 9.174kA·m-1,respectively.The differences in magnetic properties mainly result from grain size,magnetocrystalline anisotropy,shape anisotropy and defect of cobalt particles.更多还原