通过振动样品磁强计(VSM)对采用Polyol合成法,以三嵌段共聚物PEO-PPO-PEO为表面活性剂,1,2—十六烷二醇为还原剂,乙酰丙酮钴(Ⅱ)和乙酰丙酮铁(Ⅱ)为前驱体合成的CoFe2O4纳米复合颗粒的磁性能进行测试,结果表明所制得的CoFe2O4纳米复合颗粒在室温下显示软铁磁性,矫顽力约为96 Oe.采用修正的Langevin函数对CoFe2O4纳米复合颗粒的磁滞回线进行拟合,分析结果预示CoFe2O4纳米复合颗粒由两个磁性相组成.对磁滞回线进行分析有助于深入了解纳米复合颗粒的磁性能.
With a magnetic property of one-pot polyol process CoFe2O4 composite na-noparticles was synthesized using poly( ethylene glycol)-block-poly( propylene glycol)-block-poly( ethylene glycol)( PEO-PPO-PEO) as the surfactant,1,2-hexadecanediol as the reduction reagent,Co( acac)2and Fe( acac)2as the precursors by vibrating sample magnetometer( VSM). The results displayed soft ferromagnetic properties with a coercivity of about 96 Oe. The magnetic hysteresis curves of the CoFe2O4 composite nanoparticles were elucidated by modified Langevin equations. The analyses suggest that the CoFe2O4 composite system is likely composed of two magnetic phases. The analyses of magnetic hysteresis curves are helpful for demonstrating the magnetic properties of composite nanoparticles.