Power transmission lines are often plagued by ice cover, which can lead to flashovers and trips, and may even cause tower collapses, seriously jeopardizing the safe operation of the grid. In this study, we used candle ash in combination with the aforementioned self-healing underlayment. Candle ash is known for its excellent photothermal ability, and we successfully prepared a self-healing superhydrophobic coating that can withstand overlying ice. When this coating is damaged, the superhydrophobic properties are lost, but the dynamic covalent bonding inside redistributes the candle ash particles, thus restoring the superhydrophobic properties. Even when subjected to 500 g of gravity, we repeatedly sanded it 30 times on 20 cm of sandpaper, and the coating still maintained its superhydrophobic properties. In addition, the photo-thermal conversion ability of candle ash is amazing. A 5 mm thick overlay of ice can be completely melted under infrared radiation in only 300 s, and then the melted water rolls away from the surface, leaving a clean surface. Moreover, after 20 repeated ice-coating and de-icing experiments, there was no significant decline in performance. The low cost of candle ash preparation and the simplicity of the process mean that it could provide a useful reference for low-cost anti-icing methods.

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A Superhydrophobic Photothermal Anti-Icing Coating with Self-healing Properties

  • Yongjie Nie,
  • Jianwen Sun,
  • Jing Peng,
  • Zhanguo Cao,
  • Yutang Ma,
  • Hao Geng,
  • Yifan Wang,
  • Peng Wang

摘要

Power transmission lines are often plagued by ice cover, which can lead to flashovers and trips, and may even cause tower collapses, seriously jeopardizing the safe operation of the grid. In this study, we used candle ash in combination with the aforementioned self-healing underlayment. Candle ash is known for its excellent photothermal ability, and we successfully prepared a self-healing superhydrophobic coating that can withstand overlying ice. When this coating is damaged, the superhydrophobic properties are lost, but the dynamic covalent bonding inside redistributes the candle ash particles, thus restoring the superhydrophobic properties. Even when subjected to 500 g of gravity, we repeatedly sanded it 30 times on 20 cm of sandpaper, and the coating still maintained its superhydrophobic properties. In addition, the photo-thermal conversion ability of candle ash is amazing. A 5 mm thick overlay of ice can be completely melted under infrared radiation in only 300 s, and then the melted water rolls away from the surface, leaving a clean surface. Moreover, after 20 repeated ice-coating and de-icing experiments, there was no significant decline in performance. The low cost of candle ash preparation and the simplicity of the process mean that it could provide a useful reference for low-cost anti-icing methods.