TY - JOUR
T1 - Surface-Acoustic-wave-driven directional atomizers integrated with pico-liter micropumps
AU - Sugimoto, Shun
AU - Hara, Motoaki
AU - Oguchi, Hiroyuki
AU - Kuwano, Hiroki
PY - 2015/6/1
Y1 - 2015/6/1
N2 - In this paper, a surface-Acoustic-wave (SAW)-driven atomizer with micropumps was developed. The micropumps consisted of an epoxy-based reservoir with an exhaust slot and a pair of interdigital transducers (IDTs). The liquid supply from the reservoir was controlled by SAW bursts from the IDTs. A microsurge tank was fabricated into the exhaust slot to stabilize the atomization. The transferred liquid was atomized by a pair of arc-shaped IDTs (AS-IDTs). The AS-IDT was optimally designed using optical vibration observations to focus the SAW energy into a single point and enabled high directional atomization. In the operational test of the micropump with water, a transfer rate of 0.24 pl per single burst was confirmed, where the burst signal is operated at 24.1 MHz with a 50% duty cycle, 40-ms period, and 70 Vp-p amplitude. In the water atomization test, we succeeded in ejecting a narrow mist spray from the substrate using a burst signal operating at 23.8 MHz with a 20% duty cycle, 1-ms period, and 50 Vp-p amplitude. The width of the ejected mist spray was 0.7 mm in the vicinity of the substrate, and was maintained at > 1 mm within the ejection height of 8 mm.
AB - In this paper, a surface-Acoustic-wave (SAW)-driven atomizer with micropumps was developed. The micropumps consisted of an epoxy-based reservoir with an exhaust slot and a pair of interdigital transducers (IDTs). The liquid supply from the reservoir was controlled by SAW bursts from the IDTs. A microsurge tank was fabricated into the exhaust slot to stabilize the atomization. The transferred liquid was atomized by a pair of arc-shaped IDTs (AS-IDTs). The AS-IDT was optimally designed using optical vibration observations to focus the SAW energy into a single point and enabled high directional atomization. In the operational test of the micropump with water, a transfer rate of 0.24 pl per single burst was confirmed, where the burst signal is operated at 24.1 MHz with a 50% duty cycle, 40-ms period, and 70 Vp-p amplitude. In the water atomization test, we succeeded in ejecting a narrow mist spray from the substrate using a burst signal operating at 23.8 MHz with a 20% duty cycle, 1-ms period, and 50 Vp-p amplitude. The width of the ejected mist spray was 0.7 mm in the vicinity of the substrate, and was maintained at > 1 mm within the ejection height of 8 mm.
KW - arc-shaped IDT
KW - atomizer
KW - fluidic device.
KW - micro pump
KW - SAW
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U2 - 10.1109/JMEMS.2014.2346022
DO - 10.1109/JMEMS.2014.2346022
M3 - Article
AN - SCOPUS:85027941641
VL - 24
SP - 696
EP - 702
JO - Journal of Microelectromechanical Systems
JF - Journal of Microelectromechanical Systems
SN - 1057-7157
IS - 3
M1 - 6884790
ER -