Published February 10 2021, 97 pages, 25 tables, 25 figures
The advent of engineered surfaces in the last decade has produced new techniques for enhancing a wide variety of surfaces and interfaces of materials. For example, the use of engineered surface textures in the micro- and nano-scale has provided non-wetting surfaces capable of achieving less viscous drag, reduced adhesion to ice and other materials, self-cleaning, anti-fogging capability, and water repellency. These improvements result generally from reduced interface contact (i.e., less wetting or non-wetting) between the solid surfaces and contacting liquids.
Undesirable surface behaviour can create problems in a range of optical applications. The utilization of advanced surface coating technologies can be used to address a wide variety of these problems. Examples include:
Cleaning optical surfaces is time consuming, expensive, or impossible.
Fingerprints negatively impact the performance of optics.
Functional issues due to liquid behaviour on surfaces.
Contamination and fouling materials negatively impact optical behaviour.
Improved adhesive/bonding characteristics are desired on optical surfaces.
Surface is not lubricous enough.
Wettability of an optical surface is not ideal.
Fogging & moisture build up negatively impact optical performance.
Anti-fog coatings are also known as non-mist coatings and have grown in use in eyewear and headgear in the last few years. Fogging by moisture condensation on transparent substrates presents a major challenge in several optical applications that require excellent light transmission characteristics, such as eyeglasses and vehicle windshields, and can lead to serious hazards involving in blurred vision, light scattering, energy consumption and safety hazard during the usage process of transparent glass and plastics. These problems limit the uses of transparent polymeric materials.
Their development has accelerated though breakthroughs in the use of inorganic materials such as TiO2, or SiO2, polymers containing polar functions such as hydroxyl (OH), carboxyl (COOH), and ester groups (COOR),and the textured or porous surfaces.
Applications that benefit from anti-fog treatments include:
display screens (e.g., computer monitors, mobile device displays)
car windshields and lamp casings.
There are two main types of anti-fog coatings:
Hydrophobic and superhydrophobic coatings that repel water, making it bead and run off of the lens.
Hydrophilic and superhydrophilic coatings that form a thin coating of water over the lens.
Combinations of both have also been developed.
Report contents include:
Anti-fog coatings technology assessment.
Global revenues for anti-fog coatings and films 2019-2030, by market.
Market drivers and trends in anti-fog coatings and films.
Markets for anti-fog coatings and films including Automotive, solar panels, healthcare and medicine, display devices and eyewear (optics), food packaging and agricultural films.
34 Company profiles. Companies profiled include Aculon, Inc., Akzo Nobel, Clariant AG, Daikin Industries, Ltd., Hydromer, Inc, Nano-Care Deutschland AG, NATOCO Co., Ltd., NEI Corporation and many more.
Table 3. Market drivers and trends in anti-fog coatings. 16
Table 4. Applications of anti-fog coatings. 17
Table 5. Global revenues for anti-fog coatings and films, 2019-2030, millions USD, by market. 18
Table 6. Market and technical challenges for anti-fog coatings. 20
Table 7. Film coatings techniques. 23
Table 8. Techniques for constructing superhydrophobic coatings on substrates. 25
Table 9. Typical surfaces with superwettability used in anti-fogging. 34
Table 10. Contact angles of hydrophilic, super hydrophilic, hydrophobic and superhydrophobic surfaces. 38
Table 11. Disadvantages of commonly utilized superhydrophobic coating methods. 40
Table 12. Applications of oleophobic & omniphobic coatings. 42
Table 13. Types of biomimetic materials and properties. 45
Table 14. Synthesis methods for cellulose nanocrystals (CNC). 47
Table 15. CNC sources, size and yield. 48
Table 16. CNC properties. 49
Table 17. Mechanical properties of CNC and other reinforcement materials. 49
Table 18. Market overview of anti-fog coatings in automotive. 51
Table 19. Market overview of anti-fog coatings in solar panels. 51
Table 20. Market overview of anti-fog coatings in healthcare and medical. 52
Table 21. Market overview of anti-fog coatings in display devices and eyewear (optics). 53
Table 22. Market overview of anti-fog coatings in food packaging and agricultural films. 54
Table 23. Akzo Nobel Armofog products. 60
Table 24. Natoco anti-fog coating properties. 78
Table 25. Film properties of MODIPER H. 83
Figure 1. Anti-fog goggles. 14
Figure 2. Global revenues for anti-fog coatings, 2015-2030, by market. 19
Figure 3. Nanocoatings synthesis techniques. 23
Figure 4. Electrospray deposition. 26
Figure 5. CVD technique. 27
Figure 6. Schematic of ALD. 29
Figure 7. SEM images of different layers of TiO2 nanoparticles in steel surface. 30
Figure 8. The coating system is applied to the surface. The solvent evaporates. 31
Figure 9. A first organization takes place where the silicon-containing bonding component (blue dots in figure 2) bonds covalently with the surface and cross-links with neighbouring molecules to form a strong three-dimensional. 32
Figure 10. During the curing, the compounds organise themselves in a nanoscale monolayer. The fluorine-containing repellent component (red dots in figure 3) on top makes the glass hydro- phobic and oleophobic. 32
Figure 11. Hydrophilic effect. 37
Figure 12. Anti-fogging nanocoatings on protective eyewear. 38
Figure 13. A schematic of (a) water droplet on normal hydrophobic surface with contact angle greater than 90° and (b) water droplet on a superhydrophobic surface with a contact angle > 150°. 39
Figure 14. Contact angle on superhydrophobic coated surface. 39