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Lamb Wave-Based Acoustic Radiation Force-Driven Particle Ring Formation Inside a Sessile Droplet
Ghulam Destgeer1, Byunghang Ha1, Jinsoo Park1
1Department of Mechanical Engineering, KAIST , Daejeon 34141, Korea.
Analytical Chemistry
|March 4, 2016
Summary
This study shows how Lamb waves (LWs) manipulate microparticles in droplets. Acoustic radiation force, not just acoustic streaming flow, is key to forming particle rings.
Area of Science:
- Acoustofluidics
- Microparticle manipulation
- Acoustic physics
Background:
- Acoustofluidic devices utilize acoustic waves for microparticle manipulation.
- Lamb waves (LWs) offer versatile actuation frequencies without device modification.
- Acoustic streaming flow (ASF) is known to influence particle behavior in fluids.
Purpose of the Study:
- To demonstrate an acoustofluidic device using Lamb waves for polystyrene (PS) microparticle manipulation in droplets.
- To investigate the combined roles of acoustic radiation force (ARF) and ASF in particle ring formation.
- To highlight the advantages of LW-based acoustofluidics, including ease of operation and fabrication.
Main Methods:
- Fabrication of a piezoelectric substrate-based acoustofluidic device.
- Actuation of the device using Lamb waves over a frequency range of 45-280 MHz.
- Suspension of polystyrene microparticles (1-10 μm) in sessile water droplets (5-10 μL).
- Observation and analysis of particle behavior under the influence of ARF and ASF.
Main Results:
- The device successfully manipulated PS microparticles in sessile droplets.
- Acoustic streaming flow (ASF) induced poloidal flow with toroidal vortices.
- Polystyrene particles concentrated into a ring formation.
- Experimental results confirmed that acoustic radiation force (ARF) is crucial for ring formation, a role previously attributed solely to ASF.
Conclusions:
- Lamb wave acoustofluidics provides a simple, cost-effective platform for microparticle manipulation.
- Both ARF and ASF are essential for the observed particle ring formation.
- This work clarifies the underlying physics of microparticle manipulation in acoustofluidic systems.
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