摘要
纳米磁粒子能否与硅油形成稳定的分散体系是制备硅油基磁性液体的关键。阐述了用共沉淀法制备的粒径约14.2nm的镝铁氧体磁粒子,经不同的表面活性剂修饰后分散于二甲基硅油中,根据分散体系的稳定性和磁性能,考察磁粒子表面的修饰效果对分散体系稳定性和磁性能的影响。用傅立叶红外光谱仪(FTIR)分析了磁粒子与表面活性剂的亲和方式、用振动样品磁强计(VSM)对磁性液体的磁性能进行测试。实验结果表明,在粒径一定的条件下,镝铁氧体磁性液体的稳定性和磁性能主要由使用的表面活性剂种类、修饰方式及用量决定,还与磁性液体中主要组分之间的配比有关。
The key to preparation of silicon-oil magnetic liquid is whether nano-magnetic particles and silicon oil can form a stable dispersion system. In the paper, the dysprosium-doped ferrite particles with the diameter of about 14.2nm were prepared by coprecipitation method and were dispersed in 2-methyl silicon oil after being modified by various surfactants. According to the stability and magnetic performance of the dispersion system, the influence of particles＇ surface modification on the stability and magnetic performance was analyzed. The binding mode between magnetic particles and the surfactant was analyzed by FTIR and the magnetic performance of magnetic liquid was tested by Vibrating Sample Magnetometer （VSM）. The results indicate that, for given size of the particles, the stability and magnetic performance of dysprosium-doped ferrite magnetic liquid is mainly determined by the variety of surfacrant, its binding mode and its dosage and is also related to the ratio of the main ingredients of magnetic liquid.
出处
《安徽理工大学学报（自然科学版）》
CAS
2008年第3期52-56,共5页
Journal of Anhui University of Science and Technology:Natural Science
基金
安徽省教育厅自然科学基金资助项目(2006Kj143B)
关键词
硅油基磁性液体
纳米镝铁氧体
表面修饰
silicon-oil based magnetic liquid
nanometer dysprosium ferrite
surface modification
