摘要
为了提高硅油基复合磁流体的稳定性,用化学法制备的纳米Co,Fe3O4微粒,经表面活性剂改性后再用过渡液进行复合包覆,借助超声分散和机械分散手段将其分散在硅油中,解决了磁微粒的团聚问题,得到了透光率低于2.5%的稳定分散体系——硅油基Co/Fe3O4超顺磁性复合磁流体.经振动样品磁强计测定,其饱和磁化强度达106.2mT.分析了磁微粒与硅油形成稳定分散体系的条件及其影响因素.分析结果表明影响磁微粒与硅油形成稳定分散体系的主要因素有磁微粒粒径的大小;表面活性剂、过渡液的用量及分散的方式.
To improve the stability of complex magnetic liquid in silicon oil, Co, Fe3O4 nanoparticles prepared by chemical method and modified by surfactant and then composite coated by transition liquid are dispersed in silicon oil through ultrasonic and mechanic measure to eliminate aggregation of magnetic particulate. Therefore a stable dispersion system of Co/Fe3O4 complex magnetic liquid in silicon oil with light transmittance less than 2.5% is produced. The saturation magnetic intensity is up to 106.2 mT. The formation condition of the stable dispersion system in silicon oil carrier and its influential factors were investigated. The main factors that influence the formation of stable dispersion system of the magnetic particulate in silicon oil include the size of magnetic particle, surfactant, the dosage of the transition liquid, and the dispersion manner。
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2005年第4期619-623,共5页
Journal of Southeast University：Natural Science Edition
基金
安徽省教育厅重点科研资助项目(2001kj235zd).
关键词
复合磁流体
硅油
分散体系
影响因素
complex magnetic liquid
silicon oil
dispersion system
influential factor
