| 王如阳,万建国.调制声表面波驱动液滴的研究[J].声学技术,2024,43(4):451~457 |
| 调制声表面波驱动液滴的研究 |
| Study of droplet driven by modulated surface acoustic wave droplet driving |
| 投稿时间：2023-06-29 修订日期：2023-07-27 |
| DOI：10.16300/j.cnki.1000-3630.2024.04.001 |
| 中文关键词: 声表面波 微流控系统 液滴驱动 调制信号 |
| 英文关键词: surface acoustic wave(SAW) microfluidic system droplet driving modulation signal |
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| 摘要点击次数: 170 |
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| 中文摘要: |
| 研究旨在探究调制声表面波驱动下微液滴运动的规律。利用矩形波调制的正弦信号激励声表面波实现了对微液滴的定向驱动，通过拍摄并分析液滴运动影像获取了液滴的运动速度。对比了有调制的声表面波驱动与连续声表面波驱动的液滴运动之间的差异，结果表明使用调制后的声表面波，驱动效率高、液滴形状变化小的优势。测量了调制声表面波驱动下不同体积液滴的运动速度，研究表明，体积为3~4 μL的液滴具有最快的驱动速度，这主要是由于体积为3~4 μL的液滴对声能具有最佳的吸收效率。测量了液滴运动速度与驱动声表面波调制频率、占空比的关系，结合数值模拟解释了液滴的运动机理，说明了液滴驱动速率与调制信号的匹配关系，同时，最大速度对应的调制信号频率随体积先上升后下降，在体积为3.5 μL处最高。当液滴体积为3.5 μL、调制频率为40 Hz、占空比为70%时液滴驱动速度最大。通过对声表面波激励信号的调制，能够在高效驱动液滴的同时保持液滴形态相对稳定。在液滴微流控系统中，形状保持对液滴的输运和后续处理至关重要，因此调制声表面波驱动液滴的方法具有广阔的应用前景。 |
| 英文摘要: |
| This study aims to explore the microdroplet motion patterns driven by the modulated surface acoustic wave (SAW). The directional drive of microdroplets is realized by exciting SAW with the sinusoidal signal modulated by a rectangular wave, and the droplet motion velocities are obtained by capturing and analyzing the droplet's motion images. A comparison of droplet motion driven by modulated SAW and continuous SAW is conducted, and the advantages of modulated SAW drive are revealed in terms of higher driving efficiency and smaller shape deformation. The motion velocities of the droplets with different volumes under modulated SAW driving are measured, and the result indicates that droplets with the volumes from 3 to 4 μL exhibit faster driven velocities due to their optimal acoustic energy absorption capacity. Furthermore, the relationships of droplet motion velocity with the modulation frequency and duty cycle of SAW driving are measured, and the underlying motion mechanism of the droplets is elucidated by combining numerical simulations. It is demonstrated that the driven velocity of droplets is influenced by the matching relationships of the droplet's shape deformation and recovery time with the frequency and duty cycle of the modulation signal. The highest driven velocity is achieved at the volume of 3.5 μL with the modulation frequency of 40 Hz and the duty cycle of 70%. By modulating the SAW exciting signal, the relatively stable droplet morphology can be kept while driving the droplets efficiently. In the microfluidic system involving droplets, shape preservation is critical for droplet transportation and subsequent processing. Therefore, the modulated SAW driving method of droplets holds great promise for a wide range of applications. |
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