制备铁氧体纳米粒子前躯体的气泡液膜法

Gas Bubble Liquid Membrane Process for Preparation of Nanosized Ferrite Precursors

提出了采用气泡液膜反应器,将金属离子Mn+与OH-等沉淀剂在气泡液膜中进行共沉淀反应,制备铁氧体纳米粒子前躯体的气泡液膜法。制得的前躯体可精确地保持各金属组分的配料摩尔比,且分布均匀、粒径尺寸和形貌可控。用气泡液膜法制得了Mn0.25Zn0.23Fe1.04O2.04,Ni0.6Zn0.4Fe2O4和Fe3O4铁氧体的前躯体,经热处理后得到相应的铁氧体纳米粒子。其中,Ni0.6Zn0.4Fe2O4铁氧体的比饱和磁化强度Ms为82.136emu/g(1emu/g=1A.m2/kg),剩余磁Mr为13.275emu/g,矫顽力Hc为60.341Oe(1A/m=4π×10-3Oe),密度d为5.484g/cm3。

The coprecipitation reactions of metal ion Mn＋ with a precipitant,such as OH-,in a gas bubble liquid membrane（GBLM） system were carried out by the gas bubble liquid membrane reactor（GBLMR）,and the gas bubble liquid membrane process（GBLMP）for preparation of nanosized ferrite precursors was presented.The experimental results show that the mole ratio of mater ions in the substrate solution is kept accurately to the mole ratio in the nanosized ferrite precursors prepared by GBLMP,the distribution is uniform,and the particle size and morphology are controllable.The precursors of Mn0.25Zn0.23Fe1.04O2.04,Ni0.6Zn0.4Fe2O4 and Fe3O4 were prepared by GBLMP.After the precursors were heat-treated respectively,the corresponding ferrites were obtained.The specific saturation magnetization Ms,remanent magnetization Mr,coercivity Hc and the density d of the Ni0.6Zn0.4Fe2O4 ferrite are 82.136 emu/g,13.275 emu/g,60.341 Oe and 5.484 g/cm3,respectively.