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<p>In this project, a method is introduced to separate particles by using surface acoustic waves. This technique allows for the separation of not only spherical but also irregular particle shapes based on their size without the need for labeling the sample particles. Standing surface acoustic waves are generated by two parallel interdigital transducers (IDTs) on a LiNbO<sub>3</sub> Z-cut wafer substrate. A mixture of 1 µm and 10 µm alumina (AI<sub>2</sub>O<sub>3</sub>) particles were separated using a voltage of 20 V at a frequency of 10 MHz. In an SSAW field interaction of pressure nodes and anti-pressure nodes with particles, causing larger particles to move towards the nodes and smaller particles to move towards the anti-nodes. Therefore, small particles are deflected toward outlet A and C while, large particles exit through outlet B. The purity of outlets A and C is 100 % and the purity of outlet B is 89 %.</p>

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Particle separation with microfluidic device using standing surface acoustic waves

  • 期刊论文

  • 发表日期：

    2026年1月13日

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  • Nesa Yaghoobi,
  • Amirhosein Molaee,
  • Ali Asadi,
  • Shayan Valijam,
  • Alireza Salehi

摘要

In this project, a method is introduced to separate particles by using surface acoustic waves. This technique allows for the separation of not only spherical but also irregular particle shapes based on their size without the need for labeling the sample particles. Standing surface acoustic waves are generated by two parallel interdigital transducers (IDTs) on a LiNbO3 Z-cut wafer substrate. A mixture of 1 µm and 10 µm alumina (AI2O3) particles were separated using a voltage of 20 V at a frequency of 10 MHz. In an SSAW field interaction of pressure nodes and anti-pressure nodes with particles, causing larger particles to move towards the nodes and smaller particles to move towards the anti-nodes. Therefore, small particles are deflected toward outlet A and C while, large particles exit through outlet B. The purity of outlets A and C is 100 % and the purity of outlet B is 89 %.