FN® photocatalytic coatings have an extremely strong effect on air purification and surface protection against dirt and microorganism deposits. With their photocatalytic efficiency, they outperform competitors in the market hundreds of times
Mechanism against settling and growth of microorganisms
The highly efficient FN® photocatalytic surface provides extremely unfavorable conditions for the establishment and growth of microorganisms based on three interrelated effects:
- The photocatalytic phenomenon effectively removes food microorganisms which are organic impurities.
- When directly the microorganisms come in contact with the UV light activated photocatalytic their cell walls are distorted due to the interaction of atoms of organic molecules of which it is composed, with the released electrons and electron holes at the surface of the nanocrystal photocatalyst.
- FN® coating does not contain substances that most microorganisms can use effectively for their sustenance.
Consequently the FN® surfaces have virtually no algae or fungi whenever they attempt to settle on the UV light activated surfaces.
FN® surface itself effectively acts to clean dust, soot and grease particles that otherwise settle on the surface of walls, roofs and other structures, causing them to appear dirty. Self-cleaning function is activated by two mechanisms.
The first is photocatalysis, which effectively decomposes all organic components micro-dust, thus preventing them from firmly adhering to the surface and subsequently penetrate into the underlying materials deeply.
The second mechanism is superhydrophilicity and the light-activated FN® photocatalyst on the surface. Normally, water droplets can flow easily on surfaces and carry dust particles easily. But since FN® coatings react well with water, there is little power for the water to allow the dust particles to stick to the surface.
Due to the combination of the photocatalytic effect and super-hydrophilicity, dirt does not stick. The organic components are burned and inorganic photocatalysis dust residues are then removed from the surface easily due to rain and wind.
Protection against the damaging effects of ultraviolet radiation
Also, ultraviolet radiation, while an aid to Photocatalytic effect of FN®, it is one of the main influences that affect the degradation of the binder coatings and external mortar. This leads to their gradual decay.
Functionaln FN® coatings contain a large amount of photoactive titanium oxide. The nanocrystals absorb ultraviolet (UV) radiation. ** Due to their high concentration this radiation does not penetrate through the coating layer to the substrate on which the coating is applied; i.e., almost no UV gets through FN®. **
Easy graffiti removal
A base coat layer 5 FN®1 + 5 layers of FN®2 coating ensures a difficult surface environment for graffiti marks. Graffiti can be easily removed mechanically using brushes and pressurized water without chemical solvents and substrate damage.
FN® layer effectively absorbs a large amount of paint from the spray, and it is unable to saturate the surface. Indeed, any graffiti will begin to dissolve during daylight. FN® surface layer does not allow the spray color from penetrating further into the depths of the facade. Doodles, tags and other graffiti are therefore removable even after a long time. FN® layer is extremely permeable and does not prevent “breathing” ventilation of the substrate. FN® coatings can and should be, applied to historical buildings. The protective layer might need to be restored after graffiti is removed.
Materials exhibiting the photocatalytic activity are able to purify the air from a wide variety of dispersed organic and inorganic substances (such as nitrogen oxides (NOx) and sulfur oxides (SOx).
If a molecule (or microscopic dust particles) contacts the light-activated photocatalyst surface, the oxidation of the atmospheric oxygen occurs because of the distribution on the basic mineral components (mainly H2O and CO2). The air is purified and odorous or dangerous organic substances are converted into water molecules and carbon dioxide.
The most important inorganic air pollutants are nitrogen oxides (NOx). The light-activated photocatalytic surface of FN® Functional Coatings can remove NOx from the air by significantly accelerating the natural processes leading to their conversion to a nitrate solid. However, only those materials that exhibit long-term (even after several years) very high photocatalytic efficiency can be used for effective air purification indoors or outdoors (air purification from air pollutants, at least 15% NOx (NO and NO2)).
The most important inorganic pollution substances are nitrogen oxides (NOx). Light activated FN® photocatalytic surfaces are capable of removing NOx from the air so it can considerably speed up the natural processes that lead to its transformation into solid – nitrates. For effective cleaning of indoor air or in the external environment (air purification from air pollution), only useful materials that exhibit a long term, high photocatalytic activity (for a single contact air in contact with light activated FN® photocatalytic surface will remove at least 15% of NOx (NO and NO2)).
The vast majority of coatings having photocatalytic effect is achieved by the efficiency of less than 1%. Their effect for air purification in practical operation is therefore negligible and measurable. FN® coatings exhibit exceptionally high photocatalytic efficiency – 20- 50% (depending on the type of coating, substrate and specific conditions, such as e.g. temperature and humidity).
Efficiency of FN® surfaces created with FN® functional coatings
FN® surface technology is based on the use of 2nd generation paints with photocatalytic effect – functional coatings FN®. The photocatalytic effect of the surface formed by these coatings is up to 100 times greater than that of 1st generation paints that use silicate or sol-gel binders. The use of a completely new type of mineral binder is a source of extremely high photocatalytic efficiency in the second generation of photocatalytic paints. This, unlike binders that use first generation photocatalytic coatings, creates an extremely porous structure with a high content of photocatalyst, which is anchored in high concentration on the surface of the binder structure of the coating layer. This achieves an extraordinary enlargement of the surface on which the photocatalytic effect is applied in the coating layer. The larger the surface, the higher the photocatalytic efficiency.
Repesentation: photocatalyst crystals encapsulate the binder structure.
Electron microscope photos: photocatalyst crystals coated with normal binders in paint. This reduces the surface for photocatalysis.
Representation: Binders coated with photocatalyst.
Electron microscope photographs: photocatalyst crystals are extruded in high concentration onto the surface of the porous structure formed by the binder. This maximizes the surface for photocatalysis.
High photocatalytic efficiency of the surface is crucial for ensuring full functional usability and durability of photocatalytic technology. The efficacy of 1st generation photocatalytic coating surfaces does not exceed 4% of the efficiency of pure photocatalyst. FN® surface achieves an efficiency that is up to 100% photocatalytic efficiency of pure photocatalyst. The surface created by FN® coatings can therefore be used as an effective technology for the purification of air from odorous and harmful substances, for the creation of long-term surfaces resistant to the settling and growth of microorganisms, surfaces with extremely strong self-cleaning function.
The extremely high photocatalytic efficiency of FN® Surface Technology has been proven by a series of tests conducted by independent scientific research institutes in the Czech Republic and abroad. Tests performed according to ISO 22197-1 and ISO 22197-3 were also used to verify the efficacy. The effectiveness of FN technology is confirmed by hundreds of practical applications in the Czech Republic and abroad.
GRAPH COMPARISON OF PHOTOCATALYTICAL EFFICIENCY 1st generation photocatalytic paints (with silicate binder) with 2nd generation photocatalytic paints – functional paint FN® – model NOx
(measurements according to ISO 22197-1 at the J. Heyrovsky Institute of Physical Chemistry of the Academy of Sciences of the Czech Republic and other workplaces)
Long-term research carried out by employees of the J. Heyrovsky Institute of Physical Chemistry of AS CR shows the applicability of FN® surface technology for effective reduction of nitrogen oxides (NOx) in the air of urban and industrial agglomerations. They summarized the results of their research to date in a comprehensive scientific study published in the renowned scientific journal “Applied Catalysis B: Environmental”
The high photocatalytic efficiency of the FN® functional coating technology was also confirmed by comparative testing of commercial coatings performed by the J. Heyrovsky Institute of Physical Chemistry of the ASCR. Tests have shown that the efficacy of FN® is several times higher than that of competing products. (In accordance with the applicable requirements of the Competition Act, the names of competing products and their manufacturers are blacked out)
VOC (VOC) Degradation Effectiveness Graph on FN® SURFACE
VOC degradation tests (model hexane) according to ISO 22197-3; 2011 performed by ICT: average conversion of 50% (18 mg / m2 / hour).
PROTECTION AGAINST THE ESTABLISHMENT AND DEPOSITION OF MICRO-ORGANISMS
The ultraviolet-activated FN® surface very effectively prevents the deposition and growth of microorganisms (viruses, bacteria, yeasts, algae). This efficiency has been tested and confirmed by a number of specialist departments.
SUMMARY OF RESULTS OF HEALTH INSTITUTIONS: