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미세 채널에서 가스 경계면을 이용한 미세 유체의 폭 좁히기
손상욱(Sang Uk Son),이승섭(Seung S. Lee) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
A novel method for narrowing microfluid width in microchannel, essential in flow cytometry, was presented by forming and inflating gas boundaries symmetrically in perpendicular direction. The gas boundaries were generated by heating water with microheaters located beneath the microchannel of which shape was determined from empirical manner. The width of microchannel, which was 300 ㎛, was narrowed and maintained as up to 22 ㎛ which was near regular cell size. In the process the gas boundaries moved back and forth for adjustment of micro fluid width and it was maintained by two factors of pressure in the gas boundaries and the flow velocity of microfluid. The stable state began to be distorted at the velocity over 17.8 ㎜/s. The method has advantages of preserving cells intact from electrical fields and acoustic waves as usual in other on-chip devices, and using no external apparatus as syringe pumps in conventional method. Principle and fabrication were described in text as well the experiments for illustration.
손상욱(Sang Uk Son),최요한(Yo Han Choi),이승섭(Seung S. Lee) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
This paper describes fabrication of a micro cell counter integrated with an oxygen micropump and Sephadex G-25 beads counting experiment. The device utilized a phototransistor, microwindow, and light source of microscope for beads detection. Microheater and microchannel were used for pumping and guiding of beads to the micro window. Counting capability of the device was tested with a peristaltic pump and the measured signals (~10 ㎷) with oscilloscope showed peak shape when beads passed the microwindow. Pumping of beads by the oxygen micropump was carried out by heating paraffin, which enveloped manganese dioxide (catalyst), to trigger the decomposition of hydrogen peroxide into water and oxygen. It lasted for 5 min with 7 ㎕ of wt. 30 % hydrogen peroxide. Beads counting by oxygen micropump showed peaks (2~20 ㎷) with 30 ㎕ of beads sample and the number of peaks by magnitude was acquired.
잉크 전도도에 따른 정전기장 유도 잉크젯 헤드의 토출 특성 연구
최재용(Jaeyong Choi),김용재(Yong-Jae Kim),손상욱(Sang Uk Son),안기철(Ki Chul An),이수홍(Soo Hong Lee),이석한(Sukhan Lee),고한서(Han Seo Ko),변도영(Doyoung Byun) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
Printing technology is a very useful method in the several process of industrial fabrication due to non-contact and fast pattern generation. To make inkjet printing system, we focused on the electrohydrodynamic(EHD) theory which may be the type of electrostatic induced actuator based on the direct manipulation of liquid by an electric field. EHD jet method has approximately 10 jetting modes that one of these, micro dipping mode, has a good characteristic to make inkjet printing system. However, we experiment with different conductivity of ink which did not show a micro dripping mode. Micro dripping mode appears only in the specific conductivity region, and other areas that were sometimes the other jetting modes. Therefore, this paper presents the investigation of the ink property for micro dripping mode using electrostatic induced inkjet printing system.
김덕종(Duckjong Kim),서지훈(Jee-Hoon Seo),손상욱(Sang Uk Son),김재윤(Jae Yun Kim),윤의수(Eui Soo Yoon) 한국유체기계학회 2004 유체기계 연구개발 발표회 논문집 Vol.- No.-
In this study, micro blood separators capable of separating blood cell and blood plasma using microstructure are fabricated and their feasibility and separation performance are evaluated. Test results show the possibility of separating blood cell and blood plasma using microstructure. To improve separation performance and anti-clogging characteristic, technical points of tested micro blood separators are discussed and improved designs are presented.
Interference Effects of Electric Field for Multi-Nozzle Electrostatic Inkjet Device
변도영(Doyoung Byun),Tran Si Bui Quang,손상욱(Sang Uk Son),이석한(Sukhan Lee),Nguyen Vu Dat 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
To design and fabricate a multi-nozzle electrostatic drop-on-demand inkjet device, interference effects is numerically investigated and the optimal array configuration is presented. The electric voltage signals applied to the ring shaped upper electrode plates, against the nozzles, allow drop-on-demand ejection of droplet to take place: That is, a tiny droplet is taken away from the peak of the mountain shaped liquid meniscus formed at the nozzle orifice. Different from the case of single nozzle device, the neighboring electrode plates, which are designed and deposited for another nozzles, can affect the strength and distribution of electric field along the meniscus. Based on FEM(finite element method) simulation of the electric field and estimation of the critical condition for the ejection, this paper presents the appropriate nozzle array to prevent the interference effects.
전도성 잉크의 제팅 비교 및 조건 연구를 통한 pulsed jet 토출 특성을 갖는 정전기장 유도 EHD 잉크젯 헤드 시스템
최재용(Jaeyong Choi),김용재(Yong Jae Kim),손상욱(Sang-Uk Son),안기철(Ki-Chul An),고한서(Hanseo Ko),이석한(Sukhan Lee) 한국가시화정보학회 2010 한국가시화정보학회 학술발표대회 논문집 Vol.2010 No.11
The electrostatic field induced EHD (electro-hydro-dynamic) inkjet printing technology which is based on EHD jet theory is very attractive process for replacing conventional inkjet printing technology. A microdripping mode and pulsed-jet mode are the best characteristic ejection mode for drop-on-demand jetting and high resolution in electrostatic field induced EHD inkjet head system. The electrical conductivity of ink is very important factor to show pulsed-jet mode. Many conductive inks are bad ejection characteristics, but some inks which has specific electrical conductivity region has good ejection characteristics. The electrostatic field induced EHD inkjet head system with pulsed-jet ejection will be good industrial inkjet printing system by manufacturing the conductive ink which has in specific electrical conductivity region.