Research progress on application of superhydrophobic materials in anti-icing and de-icing technology
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摘要: 结冰结霜给人们的生活带来诸多不便,大量结冰积冰会影响飞机的飞行安全、推迟火箭发射任务、引起电力网络故障、造成交通运输障碍,甚至引发重大的经济问题和人身安全问题。传统的防/除冰技术耗能大、效率低、易对环境造成污染。超疏水技术利用材料的本征属性,延缓结冰,显著降低冰与基底表面的黏附力,是极具发展前景的防/除冰技术。本文首先对固体表面润湿现象及结冰机制进行了介绍,指出超疏水防/除冰材料面临着低温高湿环境下憎水性丧失,耐久性较差,面向工程的大面积制备方法制约等问题。随后,对低温高湿环境用超疏水防/除冰材料、耐久性、制备方法、多功能复合超疏水防/除冰材料等方面的研究进展进行了综述和分析。最后,对超疏水防/除冰材料在实际工程中的应用进行归纳和总结。在此基础上,展望了超疏水防/除冰材料的研究前景和发展趋势。Abstract: Icing and frosting bring many disadvantages to people's life. Ice accumulation will affect the flight safety of aircraft, delay the rocket launch mission, deform transmission lines and power networks, cause transportation obstacles, and even produce major economic problems and personal safety problems. Conventional anti-icing and de-icing methods are often costly, inefficient, or environmentally harmful. Superhydrophobic technology, which uses the intrinsic properties of materials to delay icing and significantly reduces the ice adhesion between ice and substrate, is a promising anti-icing and deicing technology. In this paper, firstly, the wetting phenomenon of solid surface and ice nucleation mechanism are introduced. It should be indicated that superhydrophobic surfaces face many problems such as the its wettability can be changed with decreasing the temperature and increasing the relative humidity, poor stability and mechanical robustness, and lack of facile and large-scale fabrication methods. Secondly, the research progress of superhydrophobic anti-icing and de-icing materials, stable and mechanically robust superhydrophobic surfaces, fabrication of superhydrophobic surfaces and multifunctional anti-icing and de-icing superhydrophobic materials are reviewed and analyzed. Finally, many applications of anti-icing and de-icing superhydrophobic materials in practical engineering are concluded and summarized. On this basis, the development trends and prospects of anti-icing and de-icing superhydrophobic materials are discussed.
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图 3 刻蚀后的铝基底((a), (b))、苯基三乙氧基硅烷(PTES)修饰 ((c), (d))、十六酸(PA)修饰 ((e), (f)) 及聚二甲基硅氧烷(TTPS)修饰 ((g), (h)) 的改性基底表面形貌和三维表面轮廓[17]
Figure 3. SEM images and three-dimensional surface profiles of theetched sample Al ((a), (b)), and the phenyltriethoxysilane (PTES) ((c), (d)), palmitic acid (PA) ((e), (f)), as well as polydimethylsiloxane (TTPS) ((g), (h)) modified samples[17]
Ra—Surface roughness of the sample
图 7 部分耐久性测试示意图((a) 紫外线辐射;(b)泰伯尔磨损测试;(c)胶带粘结测试;(d)砂砾冲击测试;(e)喷水/滴水测试;(f)砂纸磨损测试[20, 28, 33-34])
Figure 7. Schematic of parts of quantify the durability((a) UV irradiation; (b) Taber abrasion test; (c) Tape adhesion test; (d) Sand impact test; (e) Water jet/dripping test; (f) Sandpaper abrasion test[20, 28, 33-34])
H1—Height of impacting sand; at—Inclination angle of the sample; H2—Height of jetting water; d—Diameter of jetting water
图 14 (a) 超疏水电加热涂层红外热成像;(b1) 除冰实验结果:(b2) 无加热层、(b3) 有加热层[62]
Figure 14. (a) Thermal infrared image of the blade coated with superhydrophobic electrothermal coating; (b1) Digital images after anti-icing test in low icing conditions of the overall rotating blades : (b2) No heating coating, (b3) Blade with superhydrophobic electrothermal coating[62]
表 1 耐久性测试方法总结
Table 1. A summary of common durability characterization techniques
Technique Adopted operation condition Standard Reference UV irradiation Wavelength: Typically 320 nm to 400 nm in the UVA range
(e.g., 365 nm, 340 nm and 325 nm), but 254 nm (UVC) also used
Intensity: Several mW·cm−2 to 100 mW·cm−2
Irradiation time: Several hoursASTM D4329[39] [19,22,24,29-30] Plasma Plasma ype: O2 plasma
Time: Several seconds (e.g, 5 s, 15 s)— [20-21] Tape adhesion test Tapes: Scotch 810 Magic Tape, Scotch 600 tape,VHB 4910 tape
Applied pressure: typical pressure 10 kPa (up to 130 kPa)ASTM D3359[40] [20,23-24,28,31] Taber abrasion test Using a Taber abrasion machine
Applied loads: 150 g, 200 g, 250 g
Speed: Typically 60 r/minASTM D4060[41] [29,34] Sandpaper abrasion test Sandpaper grade: Typically from 80 to 800 grit
Applied pressure: Typically 15 kPa or less (up to 20 kPa)— [20,22,26-28,30-34] Sand impacting Sand particle size: Typically 100 to 300 μm
Height: Typically 25 to 40 cm (up to 110 cm)
Amount: Typically 10 g to 100 g
Sample angle: 45 °— [24,28,37] Water jet/dripping test Droplet size: 22 μL or 100 μL per drop
Height: 30 cm to 50 cm— [24,34,37] Knife scratching test Scratching by hand with a knife — [20,23,25-26] Solution immersion test Aqueous solutions: Pure water, 3.5wt% or 5wt% NaCl
in water, pH 0 to 14, hot or cold— [23-28,32,34] Ice formation/ice removal By mechanical removal, or by melting — [26,36-37] Thermal/Freezing test Environment: air, liquid nitrogen
Temperature: from −196℃ to 350℃— [28,36] -
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