核壳微粒型磁性液体的制备及其流变性能
Preparation and Rheological Properties of Core-shell Particles Magnetic Fluid
摘 要
使用单分散Fe/SiO2椭球型微纳复合胶粒作为磁性微粒,将其用吐温20做表面修饰并分散于油性基液中制备得到磁性液体;使用流变仪对这种新型磁性液体的流变性能进行了研究.结果表明:该磁性液体在承受垂直磁场方向的小剪切率时,其粘度会随磁感应强度的增加而变大;当剪切率较大时,粘度会变得很小且基本不随磁感应强度的增加而改变;磁感应强度一定时,该磁性液体有明显的剪切稀化现象;另外,其在承受小幅振荡剪切载荷时会表现出与典型磁性液体不同的粘弹性特征.
核壳颗粒
流变性能
magnetic fluid
core-shell particle
rheological property
Abstract
Magnetic fluids were prepared using monodispersed iron/silica (Fe/SiO2) ellipsoidal composite particles which were modified by Tween-20 and dispersed in an oily medium as the magnetic materials.The rheological properties of the magnetic fluids were studied by rheometer.The results showed that when the shear rate was small,viscosity of the magnetic fluids raised with the increase of the magnetic field strength.When the shear rate was large,viscosity became very samll and no longer changed with the increase of the magnetic field strength.When the magnetic field strength was certain,the magnetic fluids showed obvious shear thinning.Under small oscillator shear loads,the viscoelastic behavior of the magnetic fluids was different from that of the normal ones.
中图分类号 TQ138.1
所属栏目 新材料 新工艺
基金项目 国家重点基础研究发展计划资助项目(2007CB936803);中国科学院“百人计划”项目
收稿日期 2007/8/30
修改稿日期 2008/2/29
网络出版日期
作者单位点击查看
备注顾瑞(1985-),女,云南昆明人,硕士研究生.
引用该论文: GU Rui,GONG Xing-long,JIANG Wan-quan,HAO Ling-yun,ZHANG Zhong. Preparation and Rheological Properties of Core-shell Particles Magnetic Fluid[J]. Materials for mechancial engineering, 2008, 32(7): 24～26
顾瑞,龚兴龙,江万权,郝凌云,张忠. 核壳微粒型磁性液体的制备及其流变性能[J]. 机械工程材料, 2008, 32(7): 24～26
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