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The Basic Science behind Green Circle TiO₂ Coatings

The basic mechanism behind the effectiveness of Green Circle products is straightforward. In the presence of UV light from the sun or fluorescent light, the permanent Green Circle TiO₂ coating catalyzes a reaction in ambient oxygen and water vapor, creating hydroxyl radicals. These hydroxyl radicals are highly reactive and they rapidly breakdown any organic compounds exposed to them, including bacteria, viruses, mold, algae, mildew, oils, organic particulates, and dirt in general. These organic contaminants are continuously destroyed, and never have a chance to grow on, or adhere to, the treated surface. The decomposed compounds are shed directly, or easily washed off with water (including even rain), resulting in a self-cleaning effect.

The hydroxyl radicals also react with odorous substances and air pollutants, like nitrogen oxides (NO_x) and organic respirable dust. In this was way, TiO₂ coatings also clean air and deodorize.

Even aggressive germs like SARS and H5N1 are reliably fought if they have contact with the surface.

The first known patent related to this reactive process was from NASA in 1972, and since that time there have been over 500 patents issued on the same subject. With the recent exception of infused glass treatments however, none of this science resulted in user-friendly products until Green Circle was able to overcome a number of technical hurdles:

· Until a few years ago, the producers of TiO₂ were only able to make larger Micron and Macro size particles, not tiny Nano size particles. As a TiO₂ particle catalyzes the same reaction regardless of size, this meant that not enough of these large particles could be squeezed into a given area to have meaningful effect.

· For the process to work, Green Circle had to develop specialized inorganic coatings that could hold the TiO₂ in permanent suspension, without themselves being consumed by the reaction the TiO₂ catalyzes.

· Also for the process to work, the inorganic coating had to bond well with a wide variety of substance materials, yet still suspend the TiO₂ on its outer surface / interface so that it could act properly as a catalyst.

These problems have now been solved, resulting in an amazing self-cleaning disinfectant product that Nano Tekon provides for both home and office environments.