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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
This excellent self-cleaning effect is attributed to strong adhesion of coating, which can withstand a scratch-load as high as 5 N. After 3 months of outdoor exposure, the transparency of coated glass was degraded by only around 6%. As the coated glass possesses an anti-dust surface and great adhesion strength, the WCA of coating showed a slight drop by only 1.28% under real environment. In conclusion, the proposed hybrid self-cleaning glass has showed its multi-functionality as a great novel invention for building glass. The coated glass is expected to extend the lifespan and durability of windows.
Nanostructured Ceramics for Environment
Published in Debasish Sarkar, Nanostructured Ceramics, 2018
Self-cleaning coating on cloth, glass, and building construction can be divided into two categories: hydrophilic and hydrophobic. Both strategy clean themselves through action of water, former by contacting water that carries away dirt and stains, and latter by rolling droplets as maximum as possible. Many available commercial products like water purifiers, anti-microbial surfaces, anti-fogging, and more are using photocatalyst to clean unwanted environmental substances [20]. Self-cleaning surfaces consist of photocatalysts are becoming popular and widely used in commercial constructions. Here, “self-cleaning” should not be misunderstood, rather only implies the extended time gap between the cleaning cycles. This minimizing the surface cleaning by additional detergents and cleaning substances, and subsequently their further exposer to the environment to create pollution. With minimization of dirt on the glass surface enhance the visibility and aesthetics, and in day it results in good illumination by sunlight. These self-cleaning surfaces are present in nature, for example: lotus leaf (super hydrophobic surface i.e., water contact angle > 150°). In recent, a self-cleaning glass was developed by coating a transparent titanium dioxide, (TiO2), film on glass [21]. Followed by the titanium dioxide was used as active surfaces on different products, such as construction bricks, fabrics/textiles, ceramics, etc., to achieve self-cleaning properties, when it is exposed to the light. Self-cleaning properties of cotton fabrics coated by TiO2 is also studied by Rahal et al. [22]. Apart from individual TiO2, combination of TiO2-ZnO and Ag doped TiO2 are also studied to develop self-cleaning surfaces [23,24]. The TiO2 can be used as hydrophilic when it consist of only hydroxyl group, as well as hydrophobic contains alkyl silyl ethers along with the hydroxyl group [25]. However, TiO2 undergoes photoinduced wettability changes and there is effective switching of surfaces from hydrophobic to hydrophilic. Ultraviolet irradiation creates surface oxygen vacancies at bridging sites, resulting in the conversion of relevant Ti4+ sites to Ti3+ sites that are favorable to form hydrophilic domain for dissociative water adsorption. In this regard, an interesting study demonstrates about developing surfaces that have together superhydrophobic properties along with photocatalytic self-cleaning properties [5].
Nanotechnology in construction and demolition: What we know, what we don’t
Published in Construction Research and Innovation, 2018
Alistair Gibb, Wendy Jones, Chris Goodier, Phil Bust, Mo Song, Jie Jin
Self-cleaning glass has a nanoscale film of titanium dioxide which breaks down dirt through photocatalysis and is quite widely used, for example in conservatory roofs. Fire safety glass with an intumescent layer of nanosilica has been available for many years but is only used in high-risk situations. When exposed to high temperatures, the nanosilica swells and forms a resilient barrier, absorbing the energy of the fire.