用磁场调谐液滴的谐振频率
Tuning the resonant frequencies of a drop by a magnetic field
摘要：
本文报道了在静磁场作用下，磁性液滴在超疏水基底上垂直振动的实验研究。众所周知，一个扁平的普通液体液滴在振动时在其周边会显示出振荡的波瓣。通过在水滴中加入铁磁纳米颗粒并改变磁场的强度，我们在实验上能够有效地调节水滴的共振频率。通过使用守恒能量参数，我们表明，磁场的贡献相当于增加了一个有效的负表面张力的下降。在没有拟合参数的情况下，我们的模型与实验结果吻合得很好。
英文摘要：
We report an experimental study of a magnetic liquid drop deposited on a superhydrophobic substrate and subjected to vertical vibrations in presence of a static magnetic field. It is well-known that a flattened drop of usual liquid displays oscillating lobes at its periphery when vibrated. By adding ferromagnetic nanoparticles to a water drop and varying the strength of the magnetic field, we are experimentally able to efficiently tune the resonant frequencies of the drop. By using conservation energy arguments, we show that the magnetic field contribution is equivalent to adding an effective negative surface tension to the drop. Our model is found in good agreement with the experiments with no fitting parameter.
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