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수막을 가지는 선형 젖음성 패턴 표면에서의 액적 거동 특성
이창우(Changwoo Lee),박진영(Jinyoung Park),조한동(Handong Cho),황운봉(Woonbong Hwang) Korean Society for Precision Engineering 2013 한국정밀공학회지 Vol.30 No.12
Herein the water film was introduced to the hydrophilic area on the line patterned surface to solve the contradiction caused by surface roughness (high different wettability has advantage to control the droplet but high roughness for that high wettability difference causes obstruction of droplet moving). Thus the droplet on the water film could not be hindered to line direction but restricted to orthogonal direction, effectively. In addition, droplet behaviors according to droplet volume and line thickness were studied. Droplet fell off the line with narrowing the interface between the droplet and the water film on the line. When the droplet fell off the line, the plate angle was designated as a critical plate angle and it used as an indicator of surface capability to control the droplet. As a result critical plate angle increases as droplet volume decreases and line thickness increases.
Effect of Thiol Coating Time on the Morphology and Wettability of Copper Nanowires
곽원식(Wonshik Kwak),김기환(Kihwan Kim),조한동(Handong Cho),황운봉(Woonbong Hwang) Korean Society for Precision Engineering 2018 한국정밀공학회지 Vol.35 No.4
A study of super-hydrophobic surface originated from the analysis of lotus leaf in the nature and fabrication method of super-hydrophobic surface on copper substrate has been researched for, showed functional surfaces with anti-corrosion. However, since copper nanowires decomposed during thiol coating, it is necessary to reseach on the relation with morphology of copper nanowires and thiol coating time. In this study, the research is all about the effect of thiol coating time on wettability of copper nanowires surface. Copper hydroxide nanowires were made up by oxidation using dipping method and a polymer layer was formed on nanowires using thiol coating. Surface characteristics were assessed using scanning electron microscopy and liquid contact angles. The conclusion showed relation for wettability of thiol coated copper hydroxide nanowires with thiol coating time and proposed method would be favorable for anti-corrosion functional surface.