Micro Stirrer with Heater Mounted on SAW Actuator for High-speed Chemical Reaction

Mixing is difficult in microfluidic devices due to the low Reynolds' number. We proposed and demonstrated a surface-acoustic-wave (SAW)-based microfluidic system which can control the temperature by mounting a heater. This device has a hollow cylindrical reservoir made of resin on a piezoelectr...

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Bibliographic Details
Published in:Journal of Photopolymer Science and Technology 2022/12/16, Vol.35(2), pp.147-151
Main Authors: Takahashi, Masatoshi, Yamaguchi, Akinobu, Utsumi, Yuichi, Takeo, Masahiro, Amaya, Satoshi, Sakamoto, Hiroaki, Saiki, Tsunemasa
Format: Article
Language:English
Subjects:
actuator
Actuators
Chemical reactions
heater
lithium niobate
Lithium niobates
Microfluidic devices
Piezoelectricity
Reservoirs
stirrer
Substrates
surface acoustic wave
Thermography
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Summary:Mixing is difficult in microfluidic devices due to the low Reynolds' number. We proposed and demonstrated a surface-acoustic-wave (SAW)-based microfluidic system which can control the temperature by mounting a heater. This device has a hollow cylindrical reservoir made of resin on a piezoelectric substrate (LiNbO3), and the solution can be rotated by injecting SAWs from both sides, which are shifted parallel to the central axis of the reservoir. 0.75 W of power was supplied to the IDT to generate SAWs, and the temperature rise of the liquid was measured with a thermographic camera when 0 to 0.55 W of power was supplied to the heater. As a result, by mounting the heater on the SAW actuator, it was possible to uniformly raise the temperature of a 40 µL micro-liquid by 8 to 40 ℃ in about 80 seconds, demonstrating the usefulness of this heater-mounted SAW agitation device.
ISSN:0914-9244
1349-6336
DOI:10.2494/photopolymer.35.147