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Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics

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Acoustic Waves Coupling with Polydimethylsiloxane in Reconfigurable Acoustofluidic Platform.

Jeongeun Park¹, Beomseok Cha¹, Furkan Ginaz Almus²

¹Department of Mechanical Engineering, Chonnam National University, Yongbong-ro 77, Buk-gu, Gwangju, 61186, Republic of Korea.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)

|October 31, 2024

Summary

Acoustofluidics uses acoustic waves for microscale manipulation. This study provides guidelines for PDMS membrane thickness, optimizing reconfigurable platforms by controlling acoustic wave effects like heating and fluid flow.

Keywords:

acoustic radiation acoustic streaming acoustofluidics acousto–thermal heating wave attenuation

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Area of Science:

Acoustofluidics
Microfluidics
Materials Science

Background:

Acoustofluidics offers precise control of micro/nano-scale flows and objects.
Conventional platforms face limitations due to irreversible actuator-chip bonding.
Reconfigurable platforms utilize reversible bonding with PDMS membranes for enhanced usability.

Purpose of the Study:

To establish a quantitative design rule for selecting PDMS membrane thickness in reconfigurable acoustofluidic platforms.
To investigate the impact of PDMS membrane thickness on key acoustofluidic phenomena.
To provide a guideline for optimizing acoustofluidic applications based on membrane properties.

Main Methods:

Investigated the effect of PDMS membrane thickness (t) relative to acoustic wavelength (λ_PDMS).
Analyzed acoustofluidic phenomena including acousto-thermal heating (ATH), acoustic radiation force (ARF), and acoustic streaming flow (ASF).
Correlated membrane thickness ratios (t/λ_PDMS) with wave transmission and absorption characteristics.

Main Results:

PDMS membrane thickness significantly influences wave attenuation and acoustofluidic effects.
For t/λ_PDMS ≈ O(1), acoustic wave transmission enables ARF and ASF.
For t/λ_PDMS ≈ O(10), significant wave absorption leads to ATH.

Conclusions:

The relative thickness of the PDMS membrane is critical for controlling acoustofluidic phenomena.
A design rule based on t/λ_PDMS enables tailored manipulation of acoustic wave effects.
This research facilitates the optimization of reconfigurable acoustofluidic platforms for diverse applications.