Essay On Self Cleaning Glass

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Self-cleaning glass Introduction In this report self-cleaning glass will be examined. First the properties of self-cleaning glass will be explained. Then the different manufacturing processes of self-cleaning glass and applications are described. Self-cleaning glass properties When a material has the ability of self-cleaning the surfaces can repel contaminants such as solid particles, organic liquids and biological contaminants. This can be done by either using a hydrophobic or a hydrophilic surface. Hydrophobic surface A hydrophobic surface has a water contact angle of greater than 90°. Typical float glass or silane treated glass surface have a water contact angle of around 30° and 100°. For it to be a self-cleaning surface, which is then super hydrophobic, it has to have a static water contact angle of greater than 160° and a lower roll-off angle. The droplets on the hydrophobic self-cleaning surface will then roll of the surface and during the way it will take away the contamination particles as can be seen in Figure 1. This is also called the lotus effect because of the similar lotus leaf properties. Hydrophilic surface The other way a surface can be made self-cleaning is through a hydrophilic coating with photo catalysis properties. These photo catalytic properties were discovered in 1967 by Akira…show more content…
First the needed raw materials are batched. Silica sand, calcium oxide, soda, magnesium and recycled glasses are mixed into the needed amounts. The materials are melted in a chambered furnace at around 1500°C and then drawn onto a tin bath at around 1000°C. At this moment coatings are applied at high temperature on the material. It is then cooled in an annealing lehr at around 600°C after which the glass is checked on quality, cut and stored or can be treated with a different coating post-production (1). The process also can be seen in Figure
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