摘要
采用NaBH4液相化学还原工艺在溶剂中以PVP-VAc嵌段共聚物形成的微反应器中制备表面包覆有嵌段共聚物的金属铁纳米颗粒,通过XRD、TEM、紫外和红外光谱对其结构和形貌进行分析,用振动样品磁强计分析其磁性能,XRD表明所制备的纳米铁粉为体型立方晶;TEM显示样品为球形,且分散良好,颗粒尺寸在12-35nm之间;紫外和红外光谱分析表明,纳米铁颗粒表面包覆了PVP-VAc嵌段共聚物;磁滞回线显示,纳米铁粉的矫顽力为190Oe,饱和磁化强度为18.6emu.g-1。
The polymer-coating iron nanoparticles were prepared by NaBH4 reduction process of liquid phase in the micro-reactor formed by PVP-VAc block polymer.The products were characterized by X-ray diffraction（XRD）,transmission electron microscopy（TEM）,vibrating sample magnetometer（VSM）,Ultraviolet spectra（UV） and infrared radiation spectra（IR）.XRD pattern showed that the as-prepared sample was body-centered cubic（bcc） iron.TEM image indicated that the bcc Fe was nanoparticles of about 12-35nm in diameter and the average diameter was 21nm.The VSM result showed that the coercivity of the iron nano-particles was about 190 Oe and the saturation magnetization was 18.6 emu·g-1.UV and IR analysed demonstrated that the iron nano-particles were coated by PVP-VAc block polymer.
出处
《纳米科技》
2012年第1期61-64,87,共5页
基金
中南大学粉末冶金国家重点实验室创新基金项目（200902）
关键词
纳米铁
聚合物包覆
制备
磁性能
还原
iron nanoparticles
polymer-coating
preparation
magnetic properties
reduction
