脉冲电磁场对草酸钴粒度的控制

摘要

Small-size and monodispersed cobalt oxalate powders were prepared using CoCl2 solution and (NH4)2C2O4 solution by a precipitation process under the action of pulsed electromagnetic field (PEMF). The mechanism model of interaction between PEMF and reaction system was elementarily established. Meantime,the FTIR and conductivity data verified strongly the above mechanism of PEMF. The results indicate that the products prepared under the action of PEMF give rise to the formation of β-CoC2O4 · 2H2O particles and the av-erage diameter of as-prepared β-CoC2O4 · 2H2O powders is 3. 5403μm. Compared with the sample prepared with-out PEMF treatment, the average diameter is decreased by 60. 13％. The increases of the quantity of stable co-balt oxalate crystal nucleus and nucleation ratio result in decrease of the size and improvement of the size distri-bution of cobalt oxalate particles.%在脉冲电磁场(PEMF)作用下,以氯化钴为母液、草酸铵为沉淀剂,采用草酸盐沉淀法制备了尺度较小且粒度分布均匀的草酸钴粉体.初步分析了PEMF与草酸钴制备体系的交互作用机理.同时,利用FTIR争电导率实验为机理模型提供了强有力的实验证据.结果表明,施加PEMF条件下获得的沉淀产物为β-CoC2O4·2H2O,其平均粒径为3.5403μm,与未施加PEMF条件下制备的样品相比降低了60.13%.PEMF作用下,反应体系中稳定晶核数量的增加以及形核率的提高是草酸钴粒度减小及粒度分布得到改善的原因所在.