Iranian Journal of Ceramic Science & Engineering
1- Materials Engineering Department, Faculty of Engineering, Sirjan University , n1lari@yahoo.com
2- Advanced Materials and Renewable Energies Department, Iranian Research Organization for Science and Technology
2- Advanced Materials and Renewable Energies Department, Iranian Research Organization for Science and Technology
Abstract: (453 Views)
Today, one of the efforts is to make coatings with anti-reflective and self-cleaning properties. Because although anti-reflective coatings are widely used in solar cells, solar collectors and many other optical devices, these coatings do not maintain their anti-reflective properties for a long time in polluted environments. It is desirable to use titania with its self-cleaning and anti-vapor properties. There is a competition between the two to obtain anti-reflective and self-cleaning properties. Because if titania is used, the refractive index increases and reduces the anti-reflective property. In the present research, the titania-silica multilayer coating prepared by sol-gel method was used to create anti-reflective and self-cleaning properties. UV -Vis transmission spectrometry analysis, FT-IR infrared spectrometry and SEM electron microscope, AFM test and contact angle test were used to evaluate the coating. The results showed the achievement of a uniform coating, with high transmission and, most importantly, stable over time. The results showed that the multilayer coating obtained with a thickness of 46 nm has anti-reflective properties with 98% transmission. FTIR results also indicate the formation of Si-O-Si and Ti-O-Ti bonds. The result of the coating wetting angle test indicates that there is a very small angle of 2.3 degrees. Therefore, the coating should be introduced as ultra-hydrophilic property. This property, which is achieved due to the presence of titania layers, makes the coating easy to clean. In this sample, there was no change in the light transmission rate after the passage of time. The reason for no change is the presence of titania photocatalytic material, whose role is to clean the porosity through the decomposition of organic matter after the activation of sunlight. Therefore, the obtained coating will be stable over time in terms of anti-reflection property.
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