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미세채널 내 정재초음파 장 형성 및 미세입자 거동 관찰
조승현(Seung Hyun Cho),서대철(Dae-Cheol Seo),안봉영(Bongyoung Ahn),김기복(Ki-Bok Kim),김용일(Yong-Il Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Using ultrasonic standing waves, the position of micro particles submerged or flowing in fluid can be manipulated. Due to the acoustic radiation force of ultra sounds, particles are forced to move to pressure nodes or antinodes of standing wave field. In this work, ultrasonic standing wave field was generated in a micro water channel of a few millimeter width and the behavior of the submerged particles was observed. The standing wave field generation system was established using an immersible ultrasonic transducer. The system is valid in a frequency range between 2.0 ㎒ and 2.5 ㎒. Particles in consideration were SiC powder of a few micrometer diameters. It was observed that the particle in water moves to pressure nodal lines in the standing field. The effect of the channel thickness and operating frequency on the particle behavior was also investigated.
초음파를 이용한 생체조직 모방 팬텀에서의 마이크로입자 조작
정대원,Hiep Xuan Cao,이한솔,박종오,김창세,강병전 제어로봇시스템학회 2021 제어로봇시스템학회 국내학술대회 논문집 Vol.2021 No.6
Non-contact manipulation of microparticles have been widely researched for the targeted drug delivery. Ultrasonic manipulation method have a significant merit in the aspect of the particle targeting efficiency, thus, in this paper, 20-ultrasound transducers are arranged in the hemi-spherical shape and the acoustic phase modulation of the emitted wave is used for the manipulation. The generated acoustic filed is checked from simulation, and the manipulation test is procced under the soft-tissue mimicking gelatin phantom using the polystyrene micro beads.
조승현(Cho, Seung-Hyun),박재하(Park, Jae-Ha),안봉영(Ahn, Bong-Young),김기복(Kim, Ki-Bok) 한국소음진동공학회 2010 한국소음진동공학회 논문집 Vol.20 No.1
Micro particles in fluid can be manipulated by using ultrasonic standing wave since the ultrasound makes particles move by means of its acoustic radiation force. This work concerns the micro particle manipulation system using ultrasonic standing wave which consists of a microchannel, a reflector, and an ultrasonic transduer. In the present system, the effects of the structural elements should be carefully considered to comprehend the system and find the optimal operational condition. In this investigation, finite element analysis was employed to analyze the system. Some interesting characteristics on the reflector thickness, the channel width, and the operational frequency were observed. Several experimental results were compared with the analytic results. Consequently, this work solidifies the importance of those system parameters and reveals the possibility of various applications of the particle manipulation using ultrasonic standing wave.
Dae-Cheol Seo,A. K. M. Ariful Haque Siddique,안봉영,Cheol Gi Kim,Seung Hyun Cho 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.3
Many studies have been conducted on the filtration of microparticles using the acoustic radiation force of ultrasonic standing wave. The present work concerns a flow-through particle filtration method by utilizing frequency varying ultrasound. The periodical frequency sweep of the ultrasonic standing wave translocates particles across a microchannel, where particles in fluid flow are filtrated without barriers. The present filtration technique in a microfluidic channel was proposed conceptually in the 199 0s. However, its experimental realization on actual particles in a microfluidic channel has not been carried out in a notable way. Several sizes of polystyrene microspheres (10 µm to 90 µm) and silicon carbide (SiC) particles (37 µm) suspended in water were applied as a test sample. For filtration of those particles, a Y-branched microfluidic channel with one inlet and two outlets was made out of steel and acrylic as a form of modulized device. Ultrasound of a few MHz in band frequency (1.75 MHz to 3.05 MHz) was transmitted into one side of the channel wall to generate a standing wave field in fluid flow. The periodical frequency sweep operation showed successful filtration performance, whereby particles in water flowed into one outlet and purified water flowed into the other outlet of the Y branch of the channel.