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플라즈마 처리를 통한 초소수성 표면 제작 및 특성 평가
나종주(J.J.Rha),황윤철(Y.C.Hwang),정영수(Y.S.Jeong),문성모(S.M.Moon) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Super-hydrophobic surfaces shows contact angle of water is higher than 140 degrees. That surface can be made several methods such as Carbon nano tubes grown vertically, PDMS asperities arrays, hydrophobic fractal surfaces, and self assembled monolayers coated by CVD and so on. However, we fabricated super-hydrophobic surfaces with plasma etching which is very cost efficient process. Their surfaces are characterized by static contact angles, advancing, receding, and stability against UV irradiations. Optimal surfaces showed static contact angles were higher than 150 degrees. Super-hydrophobic property was remained after UV irradiation for one week.
나종주(J.J.Rha),황윤철(Y.C.Hwang),정용수(Y.S.Jeong),문성모(S.M.Moon),안계혁(K.H.An) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
Lotus leaf displays self cleaning effect. Because the contact angle of water is higher than 140°, water droplets roll easily on the lotus leaf. Rolling water droplets sweep off dusts or contaminants on lotus leaf. Self cleaning effects come from hydrophobicity and rough surface. In order to imitate lotus leaf, PTFE(Polytetraflouroethylene) sputtered in vacuum, CNTs(Carbon Nano Tubes) grown with different densities and replica of AAO(Aluminium Anodic Oxide) template are fabricated. Measured contact angles are 150°, 154° and 135° respectively. These results are analyzed with Wenzel's theory for homogeneous surface and Cassie and Baxters's theory for heterogeneous surface.
초정밀 시스템의 내구성 향상을 위한 다이아몬드상 탄소 박막의 마멸특성에 관한 연구
박관우(K. W. Park),나종주(J. J. Rha),김대은(D. E. Kim) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
Diamond-Like Carbon (DLC) thin film is a semiconductor with high mechanical hardness, low friction coefficient, high chemical inertness, and optical transparency. DLC thin films have widespread applications as protective coatings and solid lubricant coatings in areas such as Hard Disk Drive (HDD) and Micro-Electro-Mechanical-Systems (MEMS). In this work, the wear characteristics of DLC thin films deposited on silicon substrates using a DC-magnetron sputtering system were analyzed. The wear tracks were measured with an Atomic Force Microscope (AFM). To identify the sp² and sp³ hybridization of carbon bonds and other bonds Raman spectroscopy was used. The structural information of DLC thin films was obtained with Fourier transform infrared spectroscopy and wear tests were conducted by using a micro-pin-on-reciprocator tester. Results showed that the wear characteristics were dependent on the sputtering conditions. The wear rate could be correlated with the bonding state of the DLC thin film.