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Synthesis of a Hybrid Self-Cleaning Coating System for Glass
Published in Amit Sachdeva, Pramod Kumar Singh, Hee Woo Rhee, Composite Materials, 2021
A. Syafiq, B. Vengadaesvaran, Nasrudin Abd. Rahim, A. K. Pandey, A. R. Bushroa, K. Ramesh, S. Ramesh
The coated glass panel was covered by tiny mist droplets only. This great anti-fog performance is inferred to result from the hydrophobic surface delaying the formation of fog droplets during the convection process. Long alkyl chains are oriented outwards at the glass interface, which disrupts the van der Waals interaction with fog molecules. In addition, the aggregated nano-CaCO3 restricts fog penetration, which prevents the coalescence of fog droplets. It was observed that the initial fogging is faster for the coated glass than the bare glass: the tiny mist droplets started to appear within 6 min. After the fogging test, the coated glass was exposed at ambient temperature. The tiny mist droplets completely evaporated within a short period since nano-coating on the glass gives more air pockets and a rougher surface, consequently providing a large surface area (combination of smooth surface area and rough surface area) [38]. The initial fogging and evaporation times are recorded in Table 4.2.
Hydrophilic and hydrophobic materials and their applications
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2018
Darem Ahmad, Inge van den Boogaert, Jeremey Miller, Roy Presswell, Hussam Jouhara
Cell cultivation has similar challenges in terms of fogging. This has been resolved due to the innovation of hydrophilic materials (Patel, Choi, and Meng 2010). Humidity inside food packaging increases when they are refrigerated. This occurs due to the decrease in temperature. Consequently, condensation occurs on the inner surface of packaging. A superhydrophilic surface can be anti-fog because water spreads on the rough hydrophilic surface to form a thin film instead of droplets. Superhydrophilic treatment is different from traditional anti-fogging coating that is widely used for swimming goggles and eyeglasses. The later usually employs various surface coatings to treat the surface hydrophobic, which tends to have low adhesion with the tiny water droplet formed on it. Hydrophobic anti-fog surfaces are usually more effective than the superhydrophilic surfaces (Cooper 2000). However, a coating approach might be undesirable in many conditions, such as inside a microchannel. Safety concerns arise due to chemical agencies used for biomedical sample and food, especially when the surface is subjected to environments of high temperature and high humidity.