摘要
采用磺酸基团官能化中空二氧化硅微球为模板,通过化学共沉淀法,将尖晶石铁氧体(MeFe2O4)包覆在中空二氧化硅微球表面,制备出二氧化硅/MeFe2O4中空复合微球。利用TEM、XRD和样品振动磁强计对中空复合微球的形貌、结构和磁性能进行表征。实验结果表明,通过调节三价铁盐与二价金属离子之间的比例可以将尖晶石铁氧体的粒径范围控制在15nm以下。所制备的复合中空微球具有优良的软磁性。当金属离子总浓度为0.10mol/L时,复合微球的饱和磁化强度可达9.75Am2/kg。
Using sulfonic acid-functionalized hollow silica spheres （SHS） as templates and KNO3 as oxidant,the silica/MeFe2O4 hollow composite spheres was prepared by co-precipitation reaction.The results indicated that sulfonic acid groups on the SHS surface have strong adsorption capacity to the transition metal ions and MeFe2O4 nanoprticles.The MeFe2O4 nanoprticles were coated on the hollow silica shell.The crystal sizes of the MeFe2O4 nanoparticles on the SHS could be controlled under 15nm by adjusting proportion between Me2＋ and Fe3＋.The composite hollow spheres show soft magnetic properties.The saturation magnetization of silica/MeFe2O4 hollow composite spheres was 9.75emu/g when the total concentration of the metal ion was 0.10mol/L.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2010年第7期1232-1235,共4页
Journal of Functional Materials
基金
国家自然科学基金资助项目(50803046)
关键词
中空二氧化硅
磁性微球
制备
共沉淀
磁性能
hollow silica spheres
magnetic particles
synthesis
co-precipitation process
magnetic properties
