Coating Technology Principles

Photocatalytic nanotechnology uses the energy of light to turn it into a powerful cleansing and antimicrobial effect

Imagine a hot plate reaching a temperature of many thousand degrees Celsius. If a small piece of organic material falls on it, it immediately burns in an airy environment and breaks down to the basic mineral components. Immediately evaporate and nothing is settled on the disc. Similarly, but without fire and high temperature, our FN ® functional coatings work. These capabilities are provided by microscopic crystals of the titanium dioxide semiconductor (TiO 2 ) and the physical phenomenon of photocatalysis.

 

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Photocatalysis graphic
photocatalysis_principle
Nanotechnology and photocatalysis

The high efficiency of FN ® coatings is based on the use of a special binder that is accessible to air and can keep TiO2 nanocrystals on the surface of the coating so as to maximize their efficiency and fulfill their cleaning properties even when a colored tint is added to the coating.

The properties and effectiveness of FN ® functional coatings  have been confirmed by a number of studies conducted by the Academy of Sciences of the Czech Republic, the Institute of Chemical Technology in Prague, the VŠB-Technical University of Ostrava and other research organizations in the Czech Republic and abroad.

FN ®  coatings comply with all applicable construction and hygiene legislation.

Detailed information and photocatalysis process

The basic functional element of the FN® coating technology is photocatalyst nanocrystals. They are concentrated on the surface of microscopic porous structures of the dried coating layer.

1 square meter of the functional surface coated with FN® contains 500 square meters of usable photocatalyst nanocrystalline area.

TiO2 nanocrystals are a semiconductor that transforms light energy into an electro-chemical force capable of effectively cleaning air, water and soil, preventing the build-up of microorganisms and ensuring self-cleaning of surfaces. This effect is a photochemical reaction and is called photocatalysis.

PHOTOCALALYTIC PROCESS

The energy of ultraviolet light of normal Sunlight, is transformed into a photocatalytic effect, which only acts in the surface of the coating to a depth of approximately 9 µm. With this effect, the photocatalyst (TiO2) absorbs the light energy of ultraviolet radiation. Free electrons and electron holes appear on the surface of the photocatalyst. The direct interaction of electrons and electron holes with molecules of the surrounding environment very effectively decomposes a wide range of organic materials, including impurities (soot, dirt, oil, particles) and odor. As a result, it also prevents the establishment and growth of microorganisms (bacteria, viruses, algae, fungi, mold).

In addition to the above-mentioned decomposition of organic pollutants, the absorption of UV radiation by the TiO2 photocatalyst also results in reactions leading to the formation of surface OH groups in the air. This leads to an increase in surface energy, which leads to a significant increase in surface hydrophilicity.

Because titanium dioxide is only involved as a catalyst in the photocatalytic reaction, it is not consumed. The effects described are therefore very long-lasting.

As a result of the photocatalytic effect, the molecules of virtually all organic substances are predominantly broken down into water (H2O) and carbon dioxide (CO2). Inorganic molecules capable of oxidation are further oxidized (CO → CO2; NO → NO2; SO → SO2).