离子型磁性液体稳定性的提高及体积分数测定  

Improvement of Stability and Measurement of Volume Fraction of 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）》2014年第1期12-15,共4页Journal of Sichuan University of Science & Engineering(Natural Science Edition)

摘　　要：研究了离子型磁性液体的制备过程,通过重力沉降和离心处理来提高磁性液体的稳定性。样品处理前后的TEM图像和粒径分析表明,离心处理可以有效去除离子型磁性液体中大微粒和团聚体,改善粒径分布的多分散性,使其长期稳定存在。通过密度的测量分析表明,Fe(NO_3)_3处理后的CoFe_2O_4纳米微粒表面包裹有极薄的抗酸蚀层,微粒的形貌、粒径无明显变化,利用蒸干法可以准确确定水基离子型磁性液体的体积分数。The preparing process of ionic ferrofluids is researched, and the stability of ferrofluids is improved by sedimen- tation and eentrifugation. It can be concluded from TEM photograph and size analysis that the aggregation and big particles can be removed by centrifugation, and the polydispersity of particles size distribution can be improved, therefore the ionic fer- rofluids can exist stably for long time. The density of ferrofuids is measured and analyzed, the results show that after Fe（ NO3 ）3 treated, CoFe2O4 has been coated with a very thin antiacid layer, the shape and diameter distribution of particles are not change obviously. The volume fraction of ionic ferrrofluids based on water can be determined accurately by evaporation.

关 键 词：离心 稳定性 密度 蒸干法 

分 类 号：O414[理学—理论物理]