Contacts

Address: 3515 Miskolc-Egyetemváros, Hungary

Tel.: 46/555-246, Fax: 46/555-247

E-mail: csollak.gabor@nanocenter.hu

Web: www.nanocenter.hu

In the framework of the project we developed a ceramic tile which shows excellent antibacterial effect against the germs which are in direct contact with its surface. The developed tiles requires no special maintenance, but kill up to 95% of the bacteria that come in contact with their moist surface, this result presents a good basis for industrial production of antibacterial tile, grout and grout additives. Additionally to antibacterial tiles, we also developed an antimicrobial grout that fills the gap between the tiles and this material is almost 100% effective in both the doped grout and coated grout forms.

This tile can be used to cover floor or wall surfaces of hospitals, laboratories, food services, or everywhere, where a clean and germ free environment is required. The antibacterial tiles inhibit the growth of microbes, thus reducing microbial contamination and contribute to create a healthier environment in living and working spaces. Grout material is perfect for all applications since it will inhibit bacterial and fungal growth without any chemical application. Using nanosilver with an average particle size of 1 to 10 nm, the glazed product showed a kill rate of a maximum 99,97%, the unglazed tiles showed a kill rate of between 97 and 99% and the gorut showed a maximum of almost 100%.

Our antibacterial tiles are normal wall or floor tiles covered and fired with a nanosilver particle containing ceramic glaze. The silver content in the glaze needs to be around 200 to 400 ppm.

The silver particles and related silver ions located in the tile’s glaze penetrate the cell walls of bacteria and microorganisms, making them unable to function, grow and reproduce.

Nanoparticle silver is a broad spectrum antibacterial additive that works at very low concentrations. Silver nanoparticles can be mixed into tile glaze as an additive.

As the particles are so small and added at a low concentration, they need not significantly affect the appearance of the material. We used colloidal nanosilver solution as an antimicrobial agent, because a small concentration of silver nanoparticles is able to produce a very significant antibacterial effect.

The silver and especially nanosilver particles are very effective in killing over 650 strains of bacteria, yeast and moulds. Colloidal silver solution is obtainable from the nanomaterial market in large range of particle sizes and also a large range of quality.

In conclusion, we can say that we have developed a complete ceramic tile system that exhibits an antimicrobial effect in a permanent fashion with no special chemical or maintenance required, applied nanosilver based additive has high antibacterial effect, as a huge relative surface area to volume ratio of nanosilver is key here because a very small amount of nanosilver can produce the desired bactericidal action.