磁场强度对磁性液体磁表面张力系数的影响  

Effects of magnetic field on magnetic surface tension coefficient of ferrofluid

作　　者：李艳琴[1] 

机构地区：[1]大连大学物理科学与技术学院,辽宁大连116622

出　　处：《物理实验》2015年第5期30-33,共4页Physics Experimentation

基　　金：大连大学2014年度教改项目(No.2014-126G1)

摘　　要：研究了3种磁性液体的磁表面张力系数随磁场强度的变化规律.结果表明:随磁场强度增强,磁性液体的磁表面张力系数增大,且磁性液体的饱和磁化强度越强,其磁表面张力系数越大.当外加磁场作用于磁性液体时,各磁偶极子的磁矩方向转向外加磁场方向,形成了沿磁场方向排列的长磁链,导致磁性液体的磁表面张力系数增加.随磁场强度增强,磁性液体液膜拉脱过程中电压最大值从80.3mV增加到了87.0mV,主要是由于磁场强度的增强使液膜中纳米磁性颗粒之间的相互作用增强,使片状吊环受到的拉力增大.The dependence of magnetic surface tension coefficient on magnetic field intensity was studied for three kinds of ferrofluid .With the increase of magnetic field intensity ,the magnetic sur‐face tension coefficient increased gradually .The magnetic surface tension coefficient became larger for stronger saturation magnetization of ferrofluid .When exposed to magnetic field ,the torques of mag‐netic dipoles align along the external magnetic field and the ferroparticles form chain‐like structure a‐long the external magnetic field ,leading to increased magnetic surface tension coefficient .The maxi‐mum voltage increased from 80 .3 mV to 87 .0 mV in the pull‐apart process of liquid film with strengthening magnetic field intensity ,largely because of the enhanced interaction between ferroparti‐cles under stronger magnetic field w hich leaded to the increase of pulling force .

关 键 词：磁性液体 磁表面张力系数 磁场强度 

分 类 号：O493.4[理学—物理]