| XU Yang,QI Zhen-yi,WANG Zhi-hao,TIAN Dong-bo.Exploration for Nano-crystalline Composite Coatings in Dust-proof of Cover Glasses on Mars[J],48(5):167-171 |
| Exploration for Nano-crystalline Composite Coatings in Dust-proof of Cover Glasses on Mars |
| Received:September 29, 2018 Revised:May 20, 2019 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2019.05.025 |
| KeyWord:nano-crystalline composite coating contact area anti-reflection super-hydrophobic adhesion force efficiency of dust cleaning |
| Author | Institution |
| XU Yang |
1.Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai , China |
| QI Zhen-yi |
1.Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai , China |
| WANG Zhi-hao |
2.Beijing Institute of Spacecraft Environment Engineering, Beijing , China |
| TIAN Dong-bo |
2.Beijing Institute of Spacecraft Environment Engineering, Beijing , China |
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| Abstract: |
| The work aims to prepare ultrastructure nano-crystalline composite coatings to decrease the dust adhesion on cover glasses and recover the power supply of solar cells by cleaning the deposited dust furthest through a flipping operation in Mars environment. The nano-structured dust proof coatings were fabricated by aqueous chemical growth method with three different reaction times and surface modification procedure. The microstructure, visible- near-infrared light transmittance, surface properties and dust removal efficiency of coatings were analyzed by electron microscope, spectrophotometer, contact angle meter and flipping dust removal test. The unique coating structure formed by ZnO nanorods with ~27 nm made the contact area of dust grains with the composite coating dramatically decrease by one magnitude, compared to bare glass. The transmittance increased by 1.1% in visible region and 0.4% in near IR region. The water contact angle changed from 25°~45° to 155°~165° after surface modification by fluorochamicals. Through a slow flipping for 90 degrees, pre-deposited dust on the nano-crystalline composite coatings was cleaned by 80%~90% for grains of 50~100 μm diameters and by 60%~70% for the ones of 30~50 μm. At the same test condition, the dust proof efficiencies of bare glass were only 37.5% and 6.3%. From the dust distributions on the flipped samples and the force diagram of an individual particle on a tilted plane further, the particle falling included two basic modes of slipping and rolling, and the kinetic energy of a falling particle transferred to one or more static particles at the lower position resulting in an “avalanche” morphology. ZnO nano-crystalline composite coatings can not only improve the transmittance of visible light and near infrared light, but also greatly reduce the contact area with dust particles and reduce the adhesion of particles. Under the condition of not using high-voltage electrical energy, the removal efficiency can reach more than 80% through flipping operation, which will provide a safe way for removing dust on Mars. |
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