摘要
使用拉脱法测量了磁性液体的磁表面张力,根据计算机实时采集电压随时间的变化数据得到U-t曲线,进而将液膜拉脱过程分为6个阶段,分别研究了每个阶段的电压变化原因.无外加磁场作用时2F号磁性液体存在一电压变化较平缓的阶段,而白油和1F磁性液体并未出现此现象,这主要是因为白油和1F磁性液体表面张力较大,2F号磁性液体的表面张力较小造成.有外加磁场作用时,磁性液体的磁表面张力增加,主要是由于外加磁场增强了磁性颗粒之间的相互作用.
The surface tension of ferrofluid was measured by pull-apart method .The pull-apart process of liquid film had been divided into six stages based on the voltage curve ,which was collected online by computer and analyzed according to the force of ring-like slice .A placid voltage stage was observed for the 2F ferrofluid ,but this phenomenon didn’t occurre in the w hite oil and 1F ferrofluid when no magnetic field was applied .This is principally caused by the small surface tension of the 2F ferrofluid .The surface tension of ferrofluid increased when an external magnetic field was applied be-cause of the enhanced interaction between magnetic particles .
出处
《物理实验》
2014年第7期37-41,共5页
Physics Experimentation
基金
大连大学2014年度教改项目(No.2014-126G1)
