Analysis of anti-condensation mechanism on superhydrophobic anodic aluminum oxide surface

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• 作者：Yanpeng Wu ; Chaoying Zhang
• 关键词：Superhydrophobic surfaces ; Contact angle ; Anti-condensation ; Detachment
• 刊名：Applied Thermal Engineering
• 出版年：2013
• 出版时间：September, 2013
• 年：2013
• 卷：58
• 期：1-2
• 页码：664-669
• 全文大小：906 K

文摘

Wetting theory about superhydrophobic surfaces reveals that hydrophobicity of surfaces has great relationship with surface roughness and surface free energy. Adopt electrochemical plus fluorine silane modified method to prepare superhydrophobic surface on anodic aluminum oxide surface, which not only enhances surface roughness, but also reduces surface free energy, even?the static contact angle can reach 159.2¡ã and anti-condensation is authenticated. Based on the experimental findings, analyze the reason of anti-condensation on superhydrophobic surfaces: one is that the density of droplets formed on superhydrophobic surfaces is low and the number of droplets is little; the other is bigger static contact angle and smaller rolling angle on superhydrophobic surfaces make droplets easy to detach on smaller tilt angle. This research can solve some condensation problems of equipment using in HVAC systems, such as heat exchangers in air conditioning system, cold radiation boards, air supply outlets, and so on.