Currently a lot of research has been done on hydrophobic layers, but in its application the layer is easily damaged and is not corrosion resistant. Therefore, this research intends to decide the effect of variations in sintering temperature on the hydrophobic characteristic of SiMn/PS nanocomposite layers using a sintering temperature of 60°C, 100°C, 140°C, 180°C and 200°C for 1 hour using a furnace.. This research uses HEM-3D (High Energy Milling Ellipse-3D Mention), XRD (X-Ray Difraction) and SEM (Scanning Electron Microscope) tools. The precursor was made by giving 0.5 grams of polystyrene, 0.2 grams of silica powder and 0.2 grams of manganese powder. Coating is done by spin coating method. The results of this research from the variation of the sintering temperature showed that the SiMn/PS nanocomposite layer was hydrophobic based on the contact angle test. The highest contact angle is at a temperature of 60°C.

The present invention relates to an Photocatalyst coating of MnO-Fe2O3/PS from natural materials. Photocatalyst is a method for reducing liquid pollutant materials using ultraviolet (UV) light to produce oxidizing and reducing species on the surface of the catalyst. The catalyst used is MnO-Fe2O3/PS. The tools used are HEM-3D (High Energy Milling Ellipse-3D Mention), XRF (X-Ray Fluorescene), XRD (X-Ray Difraction) and SEM (Scanning Electron Microscope). The precursors were made by adding 0.5 grams of polystyrene and 0.4 grams of MnO powder and Fe2O3 powder. The coating is carried out by using the spin coating method and temperature variations using a furnace. The result of this research is that the MnO-Fe2O3/PS nanocomposite coating made has the best photocatalytic properties at a temperature of 60ºC with a grain size of 168.73 nm. photocatalyst coating of nanocomposite MnO-Fe2O3/PS to produce an energy gap of 2.4 electron volts.

Many researches on the synthesis of hydrophobic coatings have been carried out, but in use, the coating is easily scratched, easily damaged by contact with other objects and easy to corrode, thereby reducing the quality of the coating. This can hinder the application of hydrophobic coatings in industry and others. Therefore, it is necessary to develop a hydrophobic coating that is strong and durable and anti-corrosion so that it can improve the quality of a surface. For this reason, research is carried out by mixing a substrate that has anti-corrosion properties such as silica and is hard such as manganese in order to overcome the problems that occurred previously using the spin coating method. The precursor was made by adding 0.5 grams of polystyrene composition, with varying SiMn composition. The coating was carried out using the spin coating method and the calcination temperature was 60°C using an oven for 1 hour. The results of this study from the composition variation showed that the SiMn/PS nanocomposite layer was hydrophobic based on the contact angle test. The largest contact angle at 50%:50% composition.

The manufacture of hydrophobic coatings that have self-cleaning properties has become a research trend now, but when applied, the coating is still easily damaged due to contact with other objects and is not durable due to corrosion. This problem will certainly hinder the application of hydrophobic surfaces in industry. For this reason, the researchers mixed substrates that had anti-corrosion properties such as silica and hard and strong properties such as manganese to be able to solve the previous problem, and the method used is spin coating. The precursors were made by adding 0.5 grams of polystyrene, 0.2 grams of silica nanoparticles and 0.2 grams of manganese nanoparticles. The coating was done by using the spin coating method and the calcination temperature was 60°C using an oven for 1 hour. The research results indicate that during immersion in an acid solution (pH 6), a salt solution (pH 7) and an alkaline solution (pH 11) as well as before immersion, there is a decrease in crystal size. For the best contact angle results obtained after immersion in acid is 97.28° with salt and base is 91.65° and 95.21° and before immersion is 104.70°.