Transparent materials have been widely used in industrial and civil fields due to their excellent optical properties. However, the fogging phenomenon will significantly affect their use effect. Superhydrophilic anti-fogging coating can be utilized as an effective strategy to solve fog and surface pollution, but it also faces many challenges such as low transparency, easy wear, loss of hydrophilic components in water, and lose efficacy in high temperature and humidity environment. With this regard, the optimal design of strong and durable superhydrophilic hard coatings provides a new strategy.
The optimized SiO2, TiO2 and Al2O3 hard particles are introduced, and a kind of inorganic superhydrophilic transparent anti-fogging coating with good optical transmittance, photocatalytic self-cleaning, anti-reflection and photocatalytic properties, and excellent durability is obtained by multi-phase mixing and doping. At first, the selection of suitable dispersant is helpful to improve the apparent film formation of the coating. The mixing of the non-ionic surfactant FS0-100 and the anionic surfactant C14-16 sodium sulfonate in the coating can improve the dispersion of SiO2 nanoparticles in the solution system and provide the coating with the best apparent morphology and integrity. There is an obvious correlation between the wear resistance of the coating and SiO2 nanoparticles. The strength of the flat and dense microstructure formed by small size SiO2 particles is significantly greater than that of large size particles, and the microstructure can still be stable after 4 000 times of friction on the friction test machine, while the microstructure of large size particles is seriously damaged. In this regard, the addition of TiO2 and Al2O3 sol in the coating can improve the mechanical properties of the coating. The coating obtained by mixing TiO2 and Al2O3 sol at the ratio of 100/0.3 can withstand the friction of 10r and the hardness of more than 3H of CS-10F abrasion meter. The introduction of TiO2 also gives the coating the function of photocatalysis, which improves the anti-pollution ability of the coating. The multi-component synergies at this ratio give the coating high hydrophilicity, high hardness and dense surface microstructure, which significantly improves the wear resistance of the coating. At the same time, the hydrophilic groups are richer, which enhances the super-hydrophilic and anti-fog performance of the coating. The static water contact angle of the coating is less than 5°, and it maintains good anti-fogging performance after 6 500 times of friction test and 10 times of wear of the CS-10F rubber wheel on the friction test machine with 1 kg load. In addition, the contact angle below 10° and high optical transparency can be maintained in harsh chemical, mechanical and thermal environments such as 300 ℃ high temperature, 600 h outdoor exposure, and 48 h water immersion.
The above results show that the SiO2-TiO2-Al2O3 multi-phase composite superhydrophilic coating significantly enhances the durability and anti-fogging performance of the traditional superhydrophilic coating, and is expected to become a functional material with enhanced durability, which can effectively cope with the challenge of surface atomization, and provide a new idea for enhancing anti-fogging self-cleaning applications in the future.
Key words
superhydrophilic /
transparent and anti-fogging /
wear resistance /
self-cleaning /
durability
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References
[1] DURÁN I R, LAROCHE G. Current Trends, Challenges, and Perspectives of Anti-Fogging Technology: Surface and Material Design, Fabrication Strategies, and beyond[J]. Progress in Materials Science, 2019, 99: 106-186.
[2] KATHMANN S M.Understanding the Chemical Physics of Nucleation[J]. Theoretical Chemistry Accounts, 2006, 116(1): 169-182.
[3] SUN Z Q, LIAO T, LIU K S, et al.Fly-Eye Inspired Superhydrophobic Anti-Fogging Inorganic Nanostructures[J]. Small, 2014, 10(15): 3001-3006.
[4] 向军淮, 徐志东, 王军. TiO2-SiO2多功能薄膜的制备及其性能研究[J]. 表面技术, 2023, 52(11): 347-354.
XIANG J H, XU Z D, WANG J.Preparation and Properties of TiO2-SiO2 Multifunctional Thin Films[J]. Surface Technology, 2023, 52(11): 347-354.
[5] 王军, 刘莹, 胡静茹. 浸渍式提拉法制备TiO2薄膜的微观结构和润湿性[J]. 表面技术, 2017, 46(2): 58-62.
WANG J, LIU Y, HU J R.Microstructure and Wettability of TiO2 Thin Films Prepared by Dip Coating Method[J]. Surface Technology, 2017, 46(2): 58-62.
[6] BAE J J, LIM S C, HAN G H, et al.Heat Dissipation of Transparent Graphene Defoggers[J]. Advanced Functional Materials, 2012, 22(22): 4819-4826.
[7] ZHANG J Z, ZHANG Y C, YONG J L, et al.Femtosecond Laser Direct Weaving Bioinspired Superhydrophobic/Hydrophilic Micro-Pattern for Fog Harvesting[J]. Optics & Laser Technology, 2022, 146: 107593.
[8] FROMEL M, SWEEDER D M, JANG S, et al.Superhydrophilic Polymer Brushes with High Durability and Anti-Fogging Activity[J]. ACS Applied Polymer Materials, 2021, 3(10): 5291-5301.
[9] YOON J, RYU M, KIM H, et al.Wet-Style Superhydrophobic Antifogging Coatings for Optical Sensors[J]. Advanced Materials, 2020, 32(34): 2002710.
[10] SHANG Q Q, ZHOU Y H.Fabrication of Transparent Superhydrophobic Porous Silica Coating for Self-Cleaning and Anti-Fogging[J]. Ceramics International, 2016, 42(7): 8706-8712.
[11] PARVATE S, DIXIT P, CHATTOPADHYAY S.Superhydrophobic Surfaces: Insights from Theory and Experiment[J]. The Journal of Physical Chemistry B, 2020, 124(8): 1323-1360.
[12] VARSHNEY P, MOHAPATRA S S, KUMAR A.Fabrication of Mechanically Stable Superhydrophobic Aluminium Surface with Excellent Self-Cleaning and Anti-Fogging Properties[J]. Biomimetics, 2017, 2(1): 2.
[13] MANSOOR B, IQBAL O, HABUMUGISHA J C, et al.Polyvinyl Alcohol (PVA) Based Super-Hydrophilic Anti-Fogging Layer Assisted by Plasma Spraying for Low Density Polyethylene (LDPE) Greenhouse Films[J]. Progress in Organic Coatings, 2021, 159: 106412.
[14] HOWARTER J A, YOUNGBLOOD J P.Self-Cleaning and Anti-Fog Surfaces via Stimuli-Responsive Polymer Brushes[J]. Advanced Materials, 2007, 19(22): 3838-3843.
[15] HU B, CHEN L Z, LAN S, et al.Layer-by-Layer Assembly of Polysaccharide Films with Self-Healing and Antifogging Properties for Food Packaging Applications[J]. ACS Applied Nano Materials, 2018, 1(7): 3733-3740.
[16] CHEN Y L, KUSHNER A M, WILLIAMS G A, et al.Multiphase Design of Autonomic Self-Healing Thermoplastic Elastomers[J]. Nature Chemistry, 2012, 4(6): 467-472.
[17] LI N, KUANG J, REN Y F, et al.Fabrication of Transparent Super-Hydrophilic Coatings with Self-Cleaning and Anti-Fogging Properties by Using Dendritic Nano- Silica[J]. Ceramics International, 2021, 47(13): 18743-18750.
[18] TAKEDA S, FUKAWA M.Surface OH Groups Governing Surface Chemical Properties of SiO2 Thin Films Deposited by RF Magnetron Sputtering[J]. Thin Solid Films, 2003, 444(1/2): 153-157.
[19] YE L Q, ZHANG Y L, SONG C C, et al.A Simple Sol-Gel Method to Prepare Superhydrophilic Silica Coatings[J]. Materials Letters, 2017, 188: 316-318.
[20] LEE D, RUBNER M F, COHEN R E.All-Nanoparticle Thin-Film Coatings[J]. Nano Letters, 2006, 6(10): 2305-2312.
[21] LI X Y, HE J H.Synthesis of Raspberry-Like SiO2-TiO2 Nanoparticles Toward Antireflective and Self-Cleaning Coatings[J]. ACS Applied Materials & Interfaces, 2013, 5(11): 5282-5290.
[22] LIU X Y, XU L L, ZHAO S S, et al.Double Cross-Linked Transparent Superhydrophilic Coating Capable of Anti- Fogging even after Abrasion and Boiling[J]. RSC Advances, 2023, 13(34): 23409-23418.
[23] XI R B, WANG Y L, WANG X, et al.Ultrafine Nano- TiO2 Loaded on Dendritic Porous Silica Nanoparticles for Robust Transparent Antifogging Self-Cleaning Nanocoatings[J]. Ceramics International, 2020, 46(15): 23651-23661.
[24] YANG M X, WANG X Z, SUN J F, et al.Structure and Properties of Polyvinyl Alcohol (PVA)/Al2O3 Antifogging Coating with Self-Healing Performance[J]. Journal of Coatings Technology and Research, 2024, 21(5): 1539-1546.
[25] YAO L, HE J H.Recent Progress in Antireflection and Self-Cleaning Technology - from Surface Engineering to Functional Surfaces[J]. Progress in Materials Science, 2014, 61: 94-143.
[26] 刘靖, 王威, 余新泉, 等. 超亲水防雾表面研究进展[J]. 表面技术, 2020, 49(12): 75-92.
LIU J, WANG W, YU X Q, et al.Research Progress of Superhydrophilic Anti-Fogging Surfaces[J]. Surface Technology, 2020, 49(12): 75-92.
[27] BROWN P S, BHUSHAN B. Bioinspired, Roughness- Induced, Water and Oil Super-Philic and Super-Phobic Coatings Prepared by Adaptable Layer-by-Layer Technique[J]. Scientific Reports, 2015, 5: 14030.
[28] 陈欢. 新型亲水防雾功能涂层的制备与性能研究[D]. 无锡: 江南大学, 2022: 1-10.
CHEN H.Preparation and Properties of a Novel Hydrophilic Antifogging Functional Coating[D]. Wuxi: Jiangnan University, 2022: 1-10.
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