방사광 X-선 영상법을 활용한 마이크로/나노 구조 표면에서의 액체 퍼짐 가시화 연구

In these days, nano/micro technology has been applied to improve the solid surface wettability. Also, last researches indicate that nano structures can improve the surface wettability in the hydro-philic direction and the liquid spreading (propagation) is generated by capillary wicking. Most of the research shows qualitative analysis of the spreading phenomena due to the difficulty of small scale analysis (nano structure). In this research, quantitative analysis of the droplet interfacial behavior on silicon surfaces with micro/nano/micro-nano structures are experimentally investigated. The interfacial behavior is directly visualized by synchrotron X-ray imaging(side view). On the structured surfaces, spreading phenomena was occurred and the behaviors of liquid interface on the surfaces are different. The liquid propagation is enhaced when micro structure is combined with nano structure. Through the experiment, we understand the phenomena of liquid propagation and diffusion with the surface geometrical characteristics.