摘要
在聚乙二醇辛基苯基醚(TritonX–100)/正己醇/环己烷/水反相微乳体系中,以超顺磁性Fe3O4纳米粒子为种子,采用碱催化正硅酸已酯(TEOS)水解、缩合,制备了核壳结构的SiO2/Fe3O4复合纳米粒子。研究了Fe3O4的质量浓度、水含量ω0(水与TritonX–100的摩尔比)、NH4OH及TEOS的质量浓度对SiO2/Fe3O4复合粒子的影响。结果表明:Fe3O4的质量浓度影响SiO2/Fe3O4复合粒子的内核数目和形貌;ω0和NH4OH的质量浓度是控制SiO2在Fe3O4粒子表面异相生长的主要因素;随着TEOS的质量浓度的增加,SiO2壳层增厚,SiO2/Fe3O4复合粒子形貌更均匀,饱和磁化强度下降,矫顽力保持不变,具有良好的超顺磁性。
Core-shell structural SiO2/Fe3O4 nanocomposite particles were prepared via hydrolysis and condensation of tetraethyl or- thosilicate (TEOS) by using Fe3O4 nanoparticles as seeds in a Triton X–100/hexanol/ cyclohexane/water reverse microemulsion sys- tem. The effects of the mass concentration of Fe3O4, the mole ratio of water to Triton X–100 (ω0) and the mass concentrations of NH4OH and TEOS on SiO2/Fe3O4 nanocomposite particles were investigated. The results show that mass concentration of Fe3O4 has an effe...
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2008年第4期569-574,共6页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金(50502037)资助项目
