경사 돌기 표면의 젖음 특성 평가
Hydrophobicity Evaluation of Oblique Micro-asperities Structures
0
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
In this study, we evaluate the anisotropic flow of droplets according to the directionality of asperities. We manufacture a mold with an inclined hole by adjusting the jig angle using a high-power diode laser. Using the manufactured mold, we prepare specimens for wettability studies by the micro molding technique. We fabricate twelve kinds of surfaces with micro-asperities inclined at 0°, 15°, 30°, and 45° for asperity pitches of 100 μm, 200 μm, and 300 μm. We evaluate the static and dynamic behaviors of the droplets as a function of the asperities pitch and inclination angles. The anisotropic effect increases as the pitch increases between asperities, and the anisotropic flow characteristics increase as the inclination angle of the asperities increases. On the surface with hole pitches of 100 μm and 200 μm, the contact angle of the droplet shows high hydrophobicity at approximately 160°, but on the surface with the 300-μm hole pitch, the contact angle is approximately 110°, indicating that the hydrophobic effect rapidly reduces. Additionally, when the inclination angle of the asperities is approximately 30°, the left and right contact angle deviations of the droplet are the lowest, showing that the roll-off angle is relatively low.
Abstract
In this study, we evaluate the anisotropic flow of droplets according to the directionality of asperities. We manufacture a mold with an inclined hole by adjusting the jig angle using a high-power diode laser. Using the manufactured mold, we prepare specimens for wettability studies by the micro molding technique. We fabricate twelve kinds of surfaces with micro-asperities inclined at 0°, 15°, 30°, and 45° for asperity pitches of 100 μm, 200 μm, and 300 μm. We evaluate the static and dynamic behaviors of the droplets as a function of the asperities pitch and inclination angles. The anisotropic effect increases as the pitch increases between asperities, and the anisotropic flow characteristics increase as the inclination angle of the asperities increases. On the surface with hole pitches of 100 μm and 200 μm, the contact angle of the droplet shows high hydrophobicity at approximately 160°, but on the surface with the 300-μm hole pitch, the contact angle is approximately 110°, indicating that the hydrophobic effect rapidly reduces. Additionally, when the inclination angle of the asperities is approximately 30°, the left and right contact angle deviations of the droplet are the lowest, showing that the roll-off angle is relatively low.
참고문헌 (13)
- Topka, K. C., "Electrochemical synthesis of biomimetic micro-nano structured super-hydrophobic thin films", Mater. Today, 5, pp.27500~27510 (2018)
- 권민호, "Fabrication of Hydrophobic Surfaces using Copper Electrodeposition and Oxidation", International Journal of Precision Engineering and Manufacturing, 16(5), pp.877~882 (2015), 한국정밀공학회
- Rizzello, L., "Microscale patterning of hydrophobic", hydrophilic surfaces by spatially controlled galvanic displacement reactions, 2009, pp.25, 6019~6023
- Sánchez-Iglesias, A., "Hydrophobic interactions modulate self-assembly of nanoparticles", ACS Nano, 6, pp.11059~11065 (2012)
- Tan, S. H., "Oxygen plasma treatment for reducing hydrophobicity of a sealed polydimethylsiloxane microchannel", Biomicrofluidics, 20, pp.32204~ (2010)
- 한상욱, "Hydrophobic Polydimethylsiloxane Thin Films Prepared by Chemical Vapor Deposition: Application in Water Purification", 공업화학, 28(1), pp.1~7 (2017), 한국공업화학회[DOI]
- 홍성호, "SLA을 이용한 소수성 표면 제작", 한국트라이볼로지학회지, 37(1), pp.1~6 (2021), 한국트라이볼로지학회[DOI]
- Jung, Y. C., "Wetting behavior of water and oil droplets in three-phase interfaces for hydrophobicity", philicity and oleophobicity, Langmuir, pp.2009, 25[DOI]
- Yang, J., "Effect of sessile drop volume on the wetting anisotropy observed on grooved surfaces", Langmuir, 25, pp.2567~2571 (2009)
- Sommers, A. D., "Wetting phenomena on micro-grooved aluminum surfaces and modeling of the critical droplet size", J. Colloid Interface Sci, 328, pp.402~411 (2008)
- Ma, C., "Wettability of laser regular protuberant texturing on silicon carbide surface", Appl. Surf. Sci, 266, pp.51~56 (2013)
- Kim, T., "Unidirectioanl wetting and spreading on stooped polymer nanohairs", Soft. Matter, 5, pp.4131~4135 (2009)
- 김태완, "벼 잎 표면에서 액적의 이방성 흐름 특성에 관한 연구", 한국트라이볼로지학회지, 33(6), pp.251~255 (2017), 한국트라이볼로지학회[DOI]