Some special surface treatment methods were adopted to improve the interface interaction between the polymer and magnetic particles in order to increase the encapsulation efficiency . the ultrasonic technique , some organic solvents and several functional steric stabilizers were applied to improve the quality of final magnetic particles . ps / iron oxides magnetic composite microspheres with the size 80 - 210nm were prepared via improved emulsion polymerization 三种方法可以制备具有不同粒径和磁性能的磁性fe _ 3o _ 4纳米粒子，其中，共沉淀法制备的磁性微粒粒径大小稳定，比较容易控制在10nm左右，且所得磁性微粒的磁响应性强，具有超顺磁性，利于制备高性能的磁性复合微球。
The interactions between particles were discussed based on dlvo and edlvo theories . experiment results show the effect of the ph on the dispersion is due to the repulsion interactions of electrical double layer ; and addition suitable inorganic dispersant or organic macromolecule dispersant results in improvement the stabilization of the dispersion . the main action of the inorganic dispersants is to increase the repulsion interactions of electrical double layer and the main action of organic macromolecule dispersant is to increase hydration shell and steric hindrance 研究表明： ph对颗粒分散的影响主要体现在对颗粒间双电层静电排斥力的改变；添加合适分散剂可以改变颗粒在水中的分散性；无机电解质的分散机制主要是增加颗粒表面的双电层静电排斥作用能，而高分子分散剂的分散机制主要是增加颗粒的水化膜排斥能和位阻排斥能；复合分散剂的分散效果要优于单一分散剂；提出了用经时损失性来评价分散稳定性。
Monodisperse ( coefficient of variation 5 % ) polystyrene microspheres in the size range of 1 . 0 ~ 10 m are prepared by dispersion polymerization in ethyl alcohol reaction media using polyvinylpyrrolidone ( pvp ) as a steric stabilizer and 2 , 2 ' - azobisizobutyronitrile ( aibn ) as an initiator in suitable condition 摘要以聚乙烯吡咯烷酮为分散剂、无水乙醇为反应介质、偶氮二异丁腈为引发剂，采用分散聚合的方法，通过优化反应条件，成功制备出了粒径范围为1 ~ 10 m不同粒径级别的单分散（分散系数5 % ）聚苯乙烯微球。
