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정전기력 방식의 Drop-on Demand 토출을 위한 MEMS 잉크젯헤드 제작
孫尙郁(S. U. Son),金永珉(Y. M. Kim),崔在鎔(J. Y. Choi),李錫漢(S. H. Lee),高漢瑞(H. S. Ko),金容載(Y. J. Kim),邊渡泳(D. Y. Byun) 대한전기학회 2007 전기학회논문지 Vol.56 No.8
This paper presents a novel electrostatic drop-an-demand ejector with a conductive pole inside nozzle. The MEMS fabricated pole-type nozzle shows a significant improvement in the performance and reliability of forming meniscus and generating a micro dripping mode of droplet out of the meniscus. It is verified experimentally that the use of the pole-type nozzle. The liquid is used D2O+SDS+SWNT (5 %wt). The gap between upper electrode and nozzle is about 600 ㎛. Electrostatic drop-on-demand ejection is observed when a DC voltage of 1.5 ㎸ is applied between the control electrode and ground electrode. Droplet diameter is 100 ㎛.
브리지 및 원형 금 박막의 기계적 물성 및 계면파괴인성치 측정
최우성(W.S. Choi),최승태(S.T. Choi),손상욱(S.U. Son),이승섭(S.S. Lee),양세영(S.Y. Yang),엄윤용(Y.Y. Earmme) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
In order to measure the mechanical properties of gold films on Si substrate, two types of specimens, i.e., bridged films and circular membranes, are manufactured. Using the wedge tip, the bridged films are indented so that the bridged gold films are pushed off, which is called as V-peel test. The load-deflection curves obtained by the V-peel tests are analyzed with the concept of geometrically nonlinear beam by using the minimum potential energy theory together with Ritz method. Young’s modulus and residual stress of the bridged gold films are obtained. Blister test is also conducted to measure the Young’s modulus and residual stress of the circular membrane specimens, of which deformation is measured by Twyman-green interferometer. By gradually increasing the applied pressure in the blister test, the interfacial fracture toughness between the gold film and Si substrate is measured.
정전기장 유도된 잉크젯 프린터 헤드를 이용한 탄소나노튜브 잉크의 Drop-On-Demand 특성 연구
崔在鎔(J. Y. Choi),金容載(Y. J. Kim),孫尙郁(S. U. Son),金永珉(Y. M. Kim),李錫漢(S. H. Lee),邊渡泳(D. Y. Byun),高漢瑞(H. S. Ho) 대한전기학회 2007 전기학회논문지 Vol.56 No.8
This paper presents the DOD (Drop-On-Demand) characteristic using the electrostatic field induced inkier printing system. In order to achieve the DOD characteristic of electrostatic field induced inkjet printing, applied the bias voltage of 1.4 ㎸ and the pulse voltage of 2.0 ㎸ ~ 2.7 ㎸ using high voltage pulse generator. Electrostatic field induced droplet ejection is directly observed using a high-speed camera and for investigated DOD characteristic, CNT ink used. The electrostatic field induced inkjet head system has DOD characteristic using pulse generator which can be applied pulse voltage. The bias voltage has a good condition which form meniscus and has micro dripping mode for small size micro droplet. Also, the droplet size decreases with increasing the applied pulse voltage. This paper shows DOD characteristic at electrostatic field induced inkjet head system. Therefore, electrostatic DOD inkjet head system will be applied industrial area comparing conventional electrostatic inkjet head system.