摘要
从纳米磁性液体中磁性颗粒的沉淀和团聚的角度分析了磁性液体稳定分散的条件,讨论了在外场下磁性颗粒的尺寸对其沉淀的影响,并引入势能的概念定量研究了决定磁性颗粒团聚体形成的3种主要作用力.利用数值计算的方法,讨论了3种相互作用势能以及净势能与磁性颗粒间表面间距和表面活性剂层厚度的关系.结果表明,增大表面活性剂层的厚度是避免磁性颗粒团聚体形成的关键措施.
The dispersion stability requirements were analyzed through considering the deposition and agglomeration of the magnetic particles in a nanostructured magnetic liquid. The influence of the sizes of the magnetic particles on their deposition under external fields was discussed. Three kinds of interaction forces and their potential energies and the net potential energy were employed to study the agglomeration of the magnetic particles qualitatively and quantitatively. Numerical calculations show that the agglomeration can be eliminated by increasing the thickness of the surfactant.
出处
《上海理工大学学报》
EI
CAS
北大核心
2008年第4期335-338,344,共5页
Journal of University of Shanghai For Science and Technology
基金
国家自然科学基金资助项目(10704048)
上海市高校选拔培养优秀青年教师科研专项基金资助项目(563804)
关键词
磁性液体
分散稳定性
势能
表面活性剂
magnetic liquid
dispersion stability
potential energy
surfactant
