| GUO Haoran,WANG Youqiang,AN Kai,ZHANG Haiyang,HUANG Xingbao,REN Yibing.Preparation of Photothermal Superhydrophobic Coatings with CeO2/MWCNTs and Their Anti-icing and Deicing Properties[J],54(6):182-193 |
| Preparation of Photothermal Superhydrophobic Coatings with CeO2/MWCNTs and Their Anti-icing and Deicing Properties |
| Received:April 12, 2024 Revised:August 13, 2024 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2025.06.017 |
| KeyWord:superhydrophobicity photothermal conversion anti-icing deicing anti-fouling self-cleaning |
| Author | Institution |
| GUO Haoran |
School of Mechanical and Automotive Engineering, Qingdao University of Technology, Shandong Qingdao , China |
| WANG Youqiang |
School of Mechanical and Automotive Engineering, Qingdao University of Technology, Shandong Qingdao , China |
| AN Kai |
School of Mechanical and Automotive Engineering, Qingdao University of Technology, Shandong Qingdao , China |
| ZHANG Haiyang |
School of Mechanical and Automotive Engineering, Qingdao University of Technology, Shandong Qingdao , China |
| HUANG Xingbao |
National Key Laboratory of Safety and Resilience of Bridge Engineering, Hunan University, Changsha , China |
| REN Yibing |
School of Mechanical and Automotive Engineering, Qingdao University of Technology, Shandong Qingdao , China |
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| Abstract: |
| To deal with the hazards posed by ice accumulation in both industrial and daily life, this paper employed nanosecond laser etching of magnesium alloys to construct a micro-pit array structure, after which the micro-pit structured magnesium alloys were armored with aluminum dihydrogen phosphate (ADP). Finally, photothermal superhydrophobic coatings (CeO2/MWCNTs) were prepared by spraying CeO2/MWCNTs suspensions with different mass ratios onto the surface of pretreated magnesium alloys. In particular, ADP and PDMS were used as binders to adsorb MWCNTs entangled CeO2 nanoparticles immobilized on the substrate surface to form a double-size micro-nanostructure, which reinforced the mechanical stability of the coatings. In addition, MWCNTs had excellent photothermal conversion function and CeO2 nanoparticles had certain photothermal catalytic function, so the combination of CeO2/MWCNTs could effectively improve the photothermal and anti-icing/deicing properties of the coatings. The characteristic functional groups of the coatings were analyzed with a Fourier infrared spectrometer. The wettability was measured with a contact angle meter and then the elemental content of the coating surface was then analyzed with an energy spectrometer, and the characteristic functional groups of the coating were analyzed with a Fourier infrared spectrometer. From the elemental distribution diagram, elements C, O, Ce, N, P, and Al were uniformly distributed, where the C element was mainly from the incorporation of PDMS and MWCNTs, the Ce element was mainly from CeO2, the N element was mainly from MWCNTs, and the P and Al elements were mainly from ADP. As observed in the FTRI spectra, the coating contained not only C—C bond stretching vibration peaks and C—H bond bending vibration peaks caused by the oxidation of the substrate surface, O—P—O bending vibration peaks caused by the ADP armor, and Si—CH3 stretching vibration peaks caused by the PDMS, but also Ce—O stretching vibration peaks caused by CeO2, and C—O—Mg stretching vibration peaks caused by the MWCNTs. The above tests further illustrated that CeO2/MWCNTs composites were uniformly sprayed onto the surface. In the photothermal performance test, a xenon lamp simulator was utilized to simulate light exposure, following which an infrared camera was used to take infrared images and record the coating temperature change process. In the anti-icing/de-icing experiment, the process of freezing of water droplets and melting of ice cubes in the low temperature environment (−15.0 ℃) of the coatings were observed. Furthermore, self-cleaning and sandpaper abrasion tests were performed. After a series of tests, the optimal mass ratio of CeO2/MWCNTs was explored to be 5∶5. From the scanning electron microscope and three-dimensional topography, the surface particles of the coatings were uniformly dispersed and regular in shape, with a roughness of 32.815 5 mm. The surface contact angles was measured up to 153.5°. In the photothermal performance test, the surface temperature of the coating warmed from 6.4 to 52.3 ℃ at one solar light intensity. In the anti-icing experiment, the freezing time of water droplets on the coating surface was extended to (2 100±20) s. In the de-icing experiment, the melting time of the surface ice was reduced to 180 s. Besides, the coating remained hydrophobic even after stain protection and 60 sandpaper abrasion tests. ADP@CeO2/MWCNTs/PDMS coatings, which were fabricated by a simple method utilizing CeO2/MWCNTs materials, provided a new idea for the preparation of photothermal antifouling superhydrophobic coatings. |
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