| LIU Chao,ZHONG Tao,ZHANG Yan-mei,YANG Wan-sheng.Preparation and Anti-icing/De-icing Performance of MWCNTs Photothermal Phase-change Slippery Surfaces[J],52(11):84-94 |
| Preparation and Anti-icing/De-icing Performance of MWCNTs Photothermal Phase-change Slippery Surfaces |
| Received:August 29, 2023 Revised:November 07, 2023 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.11.007 |
| KeyWord:MWCNTs solid paraffin phase-change slippery surfaces photothermal effect anti-icing/de-icing self-repairing |
| Author | Institution |
| LIU Chao |
School of Materials and Energy,Guangzhou , China |
| ZHONG Tao |
School of Materials and Energy,Guangzhou , China |
| ZHANG Yan-mei |
School of Materials and Energy,Guangzhou , China |
| YANG Wan-sheng |
School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou , China |
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| Abstract: |
| Icing on material surfaces often poses a great challenge to the production and daily life of people, so it is important to study passive anti-/de-icing coatings. In this paper, a Phase-Change Slippery Surface with photothermal conversion capability was developed and its anti-/de-icing properties were investigated with different contents of multi-walled carbon nanotubes (abbreviated as MWCNTs) as well as solid paraffin. Firstly, microstructures were etched on a pure aluminum (Al) surface using NaOH solution, and the etched aluminum was used as the substrate. MWCNTs, epoxy resin, and solid paraffin were mixed in varying mass ratios in a beaker. The MWCNTs were evenly dispersed in the mixed solution by stirring in a constant temperature water bath. Subsequently, the mixture was uniformly coated onto the substrate using a scraper and cured at high temperature to obtain the photothermal phase-change slippery surface. The wetting performance, ice formation/de-icing characteristics, ice adhesion strength, and mechanical stability were characterized. Characterization of the coating cross-section by scanning electron microscopy revealed that the MWCNTs have been completely and evenly distributed inside the coating. The contact angle of the solid-state slippery surface measured using a contact angle measurement device was found to be 111.6°. When illuminated with near-infrared light (NIR) with a wavelength of 808 nm and power density of 0.5 W/cm2, the MWCNTs absorbed the light energy and converted it into heat, melting the surface solid paraffin into a liquid state, thereby reducing the sliding angle of water droplets from 40° to 5°, showcasing exceptional sliding performance. To test the anti-icing performance on different surfaces, experiments were conducted in a constant temperature and humidity chamber set at –20 ℃. Compared to the pure aluminum substrate, the phase-change slippery surface extended the freezing time of water droplets from 27 s to 239 s, demonstrating excellent anti-icing performance. This can be attributed to two main factors:the reduced contact area between water droplets and the phase-change slippery surface, and the significantly lower thermal conductivity of the phase-change slippery surface compared to pure aluminum. Benefitting from the outstanding photothermal properties of MWCNTs, the surface temperature rapidly increased under NIR irradiation, enabling fast de-icing within 92 s. In contrast, pure aluminum exhibits very low photothermal conversion efficiency, and even under long-term NIR irradiation, its surface temperature does not increase significantly. The ice adhesion strength on the surface was measured using a digital force gauge and found to decrease to only 34.9 kPa. Additionally, after subjecting the surface to 100 cycles of friction on 400-grit sandpaper, minimal wear was observed. This can be attributed to the excellent abrasion resistance of epoxy resin and the lubricating properties of solid paraffin, effectively reducing frictional wear. Scratch marks on the surface were rapidly repaired under NIR irradiation, and a comparison of the contact angle and ice adhesion strength before and after the test revealed that the surface had restored its performance to pre-friction levels. In conclusion, the photothermal phase-change slippery surface has better anti-icing performance than pure aluminum, while the addition of carbon nanotubes enables rapid de-icing. The addition of epoxy resin and solid paraffin greatly improved the durability and self-repairing ability of the surface, thus providing long-lasting anti-icing/de-icing capabilities. |
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