离子型磁性液体中纳米微粒间相互作用研究  

Study of the Interaction Between Nano-particles in Ionic Ferrofluids

作　　者：白浪[1] 

机构地区：[1]攀枝花学院材料工程学院,四川攀枝花617000

出　　处：《四川理工学院学报（自然科学版）》2010年第2期235-237,共3页Journal of Sichuan University of Science & Engineering(Natural Science Edition)

摘　　要：用磁偶极子硬球模型对磁性液体中磁性纳米微粒间相互作用进行了研究。分析表明,微粒间存在着静电排斥、静磁吸引和Van der Waals吸引三种相互作用,无外场时静磁作用非常微弱,可以忽略,静电排斥力作用距离远,起抗团聚作用,Van der Waals作用距离短,是引起团聚主要原因。为确保磁性液体稳定性,制备的离子型磁性液体体积分数应小于5%。The interaction between two magnetic nanoparticles in ionic ferrofluids has been studied with magnetic dipole hard sphere model. Analysis showed that there are three kinds of interaction between particles ： electrostatic repulsion, magnetic attraction and Van der Waals attraction. The magnetic attraction is very weak without external magnetic field, and can be ignored. The action range of electrostatic repulsion is long and played the role of anti-aggregation, The distance of Van der Waals attraction is short and is the main reason of aggregation. The volume fraction of ionic ferrofluids should be less than 5 % during preparation for the stability of ferrofluids.

关 键 词：磁偶极子硬球模型 相互作用 稳定性 

分 类 号：O414[理学—理论物理]