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연삭을 이용한 Surface Texturing에서 패턴의 기울기 변화
정지용(Ji-Yong Jeong),위전(Yu Zhen),사하르(Sahar M. Sana Ullah),고태조(TaeJo Ko) 한국기계가공학회 2016 한국기계가공학회지 Vol.15 No.4
Most machines lose a lot of energy due to friction. Wear due to friction also reduces performance. Therefore, it is important to reduce friction on the surface to improve energy efficiency and decrease wear. Surface texturing refers to making patterns on the surface for reducing friction. There are many surface texturing methods, such as using lasers, abrasive jet machining, and so on. Recently, mechanical manufacturing methods, such as cutting and grinding, have been highlighted. Among them, the grinding method has the advantage of making patterns in large areas quickly. Therefore, it is appropriate for surface texturing on large machines. This paper is a study on the slope change of the surface texturing pattern using grinding. Therefore, we researched the slopes of the patterns corresponding to “spindle speed and feed rate” and “curvature of workpiece surface” using a mathematical model and experiment. As a result, we made a proper mathematical model concerning our research. Therefore, using the mathematical model in this paper, we could predict the slope change of the pattern according to grinding conditions.
플라즈마 표면처리가 잉크젯 미세 패턴의 해상도에 미치는 영향
임시연(Si-Yeon Lim),이동준(Dong-Jun Lee),오제훈(Je-Hoon Oh) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
We present an experimental study on the resolution of inkjet-printed fine patterns deposited on polyimide substrate. We are particularly concerned with the effect of plasma surface polymerization on the drop diameter and uniformity deposited on the substrate. DOE (Design of Experiments) technique was used to investigate the statistically significant variables among five process variables such as plasma power, gas pressure, process time, gap between electrodes, and temperature. For PI substrate, we generated the 2nd-order response surface model from which we can find out the optimum condition to minimize the pattern resolution as well as the effect of each variable. From the surface analysis, we also found that as the amount of fluorine functional group on the surface increases, the hydrophobicity increases while the surface energy decreases, resulting in improving the resolution.
최석현,최중범,D. G. Hasko 한국물리학회 2014 새물리 Vol.64 No.7
We study the nanoscale channels formed by using electron-beam lithography with an ultrasonic-assisted development (UAD). In contrast with the traditional method, the ultrasonic source and the introduction of a phenomenological method with a non-solvent produce more efficient development by resist polymer interactions and micro-streaming effect, yielding a reduction in aggregation size and surface roughness. The resulting nanoscale multilines patterned by using the UAD show higher sensitivity and contrast than those patterned by using the MIBK:IPA method. We finally obtain Si nanochannels of 5.98 nm in width, which can contribute to study the mesoscopic physics of nanostructures and quantum devices. 초음파를 이용한 현상 (Ultrasonic-assisted development: UAD) 을 도입한 전자빔 리소그래피를 사용하여 나노스케일 미세패터닝을 연구하였다. 기존의 MIBK:IPA 현상액을 이용하는 공정과는 대조적으로, 초음파와 비 용매의 사용은 보다 효율적인 현상 과정을 보였는데 이는 감광막 고분자의 상호작용 및 연속적인 마이크로 스트림밍 효과에 기인하며 결과적으로 응집 크기와 표면 거칠기에 현저한 감소를 보였다. 이러한 초음파 이용 현상 도입을 통해 얻은 나노스케일의 다중 채널 패터닝은 기존의 MIBK:IPA 방법에 비해 높은 민감도 및 대비도를 보였다. 최종적으로 5.98 nm 선폭의 미세 나노선을 얻었는데 이는 나노 구조 및 양자 소자의 중시 물리 현상 규명에 기여할 수 있을 것이다.
레이저에 의해 패터닝 된 바늘과 탄성중합체와의 마찰 효과
김재구(Jaegu Kim),노승국(Seungkook Ro),박종권(Jongkweon Park),조성학(Sunghak Cho),황경현(Kyunghyun Whang) 한국레이저가공학회 2012 한국레이저가공학회지 Vol.15 No.3
The friction force of patterned needle in elastomer have been investigated to verify the application for bio and plastic industry. The micro pattern on the needle surface were prepared by 266 nm, 20 ns laser and 800 nm, 220 fs laser, which were able to generate the different surface roughness. The friction force was measured by the load cell of 10 N capacity. As the results, the friction force of no patterned needle is almost constant during the needle penetrates the silicone rubber sample. However, the needle having asperities shows the variation of the friction force. The higher the surface roughness is, the smaller the friction force is until the surface roughness is very high. In our experiment conditions, the reduction of the friction force by 20 % compared to no pattern needle was achieved with straight and 50 μm discrete line generated by 266 nm, 20 ns laser.
Patterning of Functional Nanoparticles Using Solution-based Selective Surface Treatment Process
박창구(Chang-Goo Park),정준호(Jun-Ho Jeong),최준혁(Jun-Hyuk Choi),이지혜(Jihye Lee),정주연(Joo-Yun Jung),전소희(Sohee Jeon),이응숙(Eungsug Lee),최대근(Dae-Geun Choi) Korean Society for Precision Engineering 2019 한국정밀공학회지 Vol.36 No.11