کنفرانس بین المللی میکروالکترونیک ایران

صفحه اصلی / هفتمین کنفرانس بین المللی میکروالکترونیک ایران

Electrically-Driven Tunable Acoustic Fields for Acoustofluidic Particle Manipulation

نویسندگان :

Elahe Hosseini¹ Behdad Barahimi² Sara Darbari³ Iman Halvaei⁴ Mohammad Kazem Moravvej-Farshi⁵

1- دانشگاه تربیت مدرس 2- دانشگاه تربیت مدرس 3- دانشگاه تربیت مدرس 4- دانشگاه تربیت مدرس 5- دانشگاه تربیت مدرس

کلمات کلیدی :

Acoustofluidics،Standing Surface Acoustic Wave،Acoustic Radiation Force،Acoustic-Induced Drag Force،Particle Critical Radius

چکیده :

Acoustofluidics integrates acoustic waves with microfluidic systems to achieve precise, contact-free manipulation of microparticles, offering high efficiency and biocompatibility. Standing surface acoustic wave (SSAW) devices are widely used for particle focusing and separation owing to their high precision and operational stability. In this study, we develop a two-dimensional multiphysics simulation of an SSAW-based acoustofluidic device consisting of a 128° Y-cut, X-propagating Lithium Niobate (LiNbO₃) substrate with five pairs of interdigital transducers and a rectangular polydimethylsiloxane layer. The piezoelectric and thermoviscous acoustic equations were coupled and solved via the finite element method to obtain the first-order acoustic fields and second-order streaming profiles. Then, the critical radius for the separation of polystyrene particles was determined by balancing the acoustic radiation force and acoustic-induced drag force under varying frequencies and voltages. Results show a stable critical radius within 3.80–3.85 µm, with a minor decrease observed across the two selected frequencies, indicating the reliability and effectiveness of the proposed design. These findings demonstrate the potential of our design for high-precision particle separation for lab-on-a-chip applications.