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3D 프린터를 이용한 상자기성 양친매성 입자 생성기 제작
신성훈(Seonghun Shin),심재민(Jaemin Sim),송륜근(Ryunguen Song),이진기(Jinkee Lee) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.12
The amphiphilic particle having multi surface properties is one of the materials that are possibly used to separate the oil/water. By forming a stable paramagnetic Janus emulsion and polymerizing it, the functional particle can be fabricated. This particle absorbs oil from water and its motion is controllable by electromagnetic force. Even though a large advantage of these particles, the production of uniform Janus emulsion and continuous polymerization has been limited. To resolve this problem, we built a 3D printed microfluidic platform for monodispersed Janus emulsion mass production. The fabricated particle had an amphiphilic characteristic with bowl-like shape. We analyzed the relationship between capillary number and the particle diameter and observed the change of interfacial tension and morphology as the surfactant concentration changes. And we confirmed that the particles we fabricated adsorb the oil and are attracted to the permanent magnet. It is expected that mass-production of these Janus particles would be effective on enhance the efficiency of oil separation.
신성훈(Seonghun Shin),조성수(Seongsu Cho),송륜근(Ryunguen Song),김혜정(Hyejeong Kim),이진기(Jinkee Lee) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Since oil spill accidents bring serious damage to the marine ecosystem, effective remediation methods are required. Amphiphilic Janus particle can be adsorbed to the water/oil interface and stabilize it. Therefore, they have been widely studied to replace traditional methods. However, low production rate and complexity of the processes are main obstacles for the large-scale production. To solve this problem, we built a 3D printed parallelized microfluidic droplet generator for large-scale production of amphiphilic and magnetic Janus particles. We verified the mono-dispersity of the particles and analyzed the relationship between flow rate ratio and particle size. In addition, we experimentally prove that Janus particles can be adsorbed onto the interface and stabilize it. Then, we built a parallelized droplet generator to increase the production rate. It is expected that the mass production of these Janus particles would be an effective solution for oil adsorption and recovery.
조성수(Seongsu Cho),신성훈(Seonghun Shin),심재민(Jaemin Sim),이진기(Jinkee Lee) 한국가시화정보학회 2021 한국가시화정보학회지 Vol.19 No.2
River and stream are the important water supply source in our lives. Eutrophication causes excessive green algae growth including microcystis, which makes harmful to ecosystem and human health. Therefore, the water purification process to remove green algae is essential. In Korea, green algae alarm system exists depending on the concentration of green algae cells in river or stream. To maintain the growth amount under control, green algae monitoring system is being used. However, the unmanned, small and automatic monitoring system would be preferable. In this study, we developed the 3D printed device to measure the concentration of green algae cell using microfluidic droplet generator and deep learning. Deep learning network was trained by using transfer learning through pre-trained deep learning network. This newly developed microfluidic cell counter has sufficient accuracy to be possibly applicable to green algae alarm system.
조성수(Seongsu Cho),신성훈(Seonghun Shin),심재민(Jaemin Sim),이진기(Jinkee Lee) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
River is the major water source for city. When eutrophication is occurred, green algae in water is increased abnormally, and it is harmful to ecosystem in river, and human health. To resolve this problem, additional purification procedure is needed. So, monitoring the green algae in river is important to manage the quality of water supply in city. Korean government manage the green algae alarm system based on the concentration of green algae cell in river. To maintain this system well, effective green algae concentration measurement device is needed. In this study, we developed the microfluidic device to measure the concentration of green algae cells in sample based on droplet generation and deep learning. We compared the result with the result measured by haematocytometry and confirmed that it had enough accuracy to apply on green algae alarm system.
3D 프린터를 이용한 개별온도제어가 가능한 미세 유체 화학반응기 모듈 제작
김행영(Haengyeong Kim),박상현(Sanghyeon Park),최형호(Hyeongho Choe),신성훈(Seonghun Shin),조성수(Seongsu Cho),이진기(Jinkee Lee) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Research on microfluidic reactor is being developed in various fields such as chemical synthesis, biosystem, and nanomaterial synthesis. Especially, in the chemical synthesis and drug reaction field, experiments forming thermal gradient are conducted to find out the optimal conditions. In this study, we made multi-sthermal controllable 3D printed microfluidic reactor module to improve speed of production by parallelizing channels. The device consists of 3D printed distributor, heating and sensing module and Arduino. If the user sets the desired temperature, the fluid converges to that temperature by PID control. As a result, the maximum temperature was controlled up to 45℃ and stable after 858s at the latest. In future works, we will construct thermally insulated environment and change material of the module to fabricate microfluidic reactor modules to get fast and stable temperature control.