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ESD 전극을 이용한 분무코팅 균일도 개선에 관한 연구
당현우(Hyun-Woo Dang),양성욱(Seong-Wook Yang),도양회(Yang-Hoi Doh),최경현(Kyung-Hyun Choi) 한국기계가공학회 2016 한국기계가공학회지 Vol.15 No.2
In this study, experiments are conducted to improve spray coating uniformity by using second and third electrodes based on the electrospray atomization mechanism. The uniformity of fabricated thin films can be improved by adjusting the design of the second electrode. The implementation of the second electrode with an elongated hole and a bending angle of 90° results in highly uniform films. In addition, induced area to substrate is increased by lowering the applied voltage using the third electrode with a round rod shape. A linear correlation between applied voltage and induced area is confirmed. Thin film thickness and surface roughness are measured after the fabrication of thin films through the electrospray process. It is confirmed that a thin film is formed having an average thickness of 273.44 ㎚, a thickness uniformity of less than 10%, and a surface roughness of 3 ㎚.
정전기력 분무 공정 기반 마스크 패터닝 시스템 기술 개발
최경현(Kyung-Hyun Choi),당현우(Hyun-Woo Dang),김형찬(Hyung-Chan Kim),고정범(Jeong-Beom Ko),도양회(Yang-Hoe Doh),김동수(Dong-Soo Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
An environmental-friendly spray deposition is different from commercially available deposition techniques like piezo, thermal, and aerosol. Through electrostatically controlled conductive inks, patterns can be achieved on substrate by using submicron mask. In this study a novel process of selective patterning is implemented. This paper discusses an optimized system design for analysis of process variables by electro pray deposition. Colloidal solution contained in a metallic capillary head driven by electrostatic force verified mask patterning experimentally.
Henkensmeier, Dirk,Dang, Quoc Khanh,Nambi Krishnan, N.,Jang, Jong Hyun,Kim, Hyoung-Juhn,Nam, Suk-Woo,Lim, Tae-Hoon The Royal Society of Chemistry 2012 Journal of materials chemistry Vol.22 No.29
<P><I>ortho</I>-Dichlorobenzene (ODB) was investigated as a pore modifier for both Nafion membranes and proton exchange membrane fuel cell (PEMFC) catalyst layers. When ODB containing Nafion dispersions are cast into a film, evaporation leads to dense membranes with one highly porous surface layer occupying 20–30% of the overall thickness. Dense Nafion membranes with a porous top layer are interesting for use in membrane humidifiers, for increasing the electrode–membrane interface areas in electrochemical devices like fuel cells or electrolysers, and other applications. Fuel cell membrane electrode assemblies were obtained by spray coating commercial Nafion 212 membranes with ODB containing catalyst inks. ODB does not poison the catalyst, and 54–120% higher potentials in comparison to the 217 mV obtained with an ODB free ink were achieved at 1.5 stoic air flow, 100% rh and a current density of 1 A cm<SUP>−2</SUP>. This shows that the porous catalyst electrode structure is changed, resulting in a reduced contribution of mass transport limited overpotentials. Furthermore, MEAs prepared with ODB in the catalyst ink are less sensitive towards changes in the air flow rate and the cathode relative humidity (between 50% rh and 100% rh: 217–292 mV at 1 A cm<SUP>−2</SUP> without ODB and 439–478 mV with ODB).</P> <P>Graphic Abstract</P><P>Dense Nafion membranes with one porous surface layer were produced by simple solution casting. The performance of membrane electrode assemblies in a polymer electrolyte fuel cell was improved. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2jm32146g'> </P>
Choi, Kyung Hyun,Zubair, Muhammad,Dang, Hyun Woo Institute of Pure and Applied Physics 2014 Japanese Journal of Applied Physics Vol. No.
<P>The fabrication and characterization of a temperature sensor on flexible poly(ethylene terephthalate) (PET) substrate is discussed. The device was printed by drop-on-demand (DOD) electrohydrodynamic (EHD) Patterning method using silver nanoparticles ink on a roll-to-roll (R2R) system on a mass scale. EHD patterning was performed at atmospheric pressure and room temperature in a single step. The ink viscosity was 300 cps and it contained 55 wt % of silver nanoparticles. The parameters for printing head speed, and DOD were optimized to create connected lines. The printed temperature sensor has the resistivity of 25.35 mu Omega.cm and the temperature coefficient of resistance (TCR) is 0.0007687 degrees C-1. The micro sensor can be applied to many applications to measure temperature accurately of flat or curved surfaces. (C) 2014 The Japan Society of Applied Physics</P>