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News

Silver-copper colloidal coatings with slow-release germicide are anti-microbial

INM - Leibniz-Institut Für Neue Materialien : 22 July, 2014  (New Product)
Researchers at the INM Leibniz Institute for New Materials have now produced antimicrobial abrasion-resistant coatings with both silver and copper colloids with a long-term effect that kill germs reliably and at the same time prevent germs becoming established. The coatings are particularly suitable for the application on large and solid surfaces, on doorhandles and for textiles.
Silver-copper colloidal coatings with slow-release germicide are anti-microbial

At the same time, the surface of the coating is anti-adhesive, so neither dead nor fresh germs can adhere to the surface. As a result, the coating primarily counteracts the formation of an extensive biofilm.


 


The researchers have been able to prove the double microbicidal and biofilm-inhibiting action using the standardised ASTM E2 180 test process. The new material can be applied to a variety of substrates such as plastic, ceramic or metal using conventional techniques such as spraying or dipping, and cures thermally or photochemically. Selective variation of the individual components allows the developers to react to the particular and different needs of potential users. 


As part of the EU-sponsored CuVito project, the developers are now looking at increasingly using copper colloids and copper ions as well as silver which they hope will open up other fields of application.


 


“The new development combines two properties which means the presence of germs and fungi on these surfaces is zero”, explained Carsten Becker-Willinger, Head of the Nanomers Program Division. Silver or copper colloids which gradually release germicidal metal ions into the environment are incorporated in the coating. “The metal colloids are only a few nanometers in size, but their particular ratio of size to surface area produces a distinctive long-term effect. The “consumption” of metals to metal ions is then so low that the coating can be effective for several years”, says the chemist. The long-term effect will also be increased by the high abrasion resistance.


 


The INM from Saarbruecken was one of few German research institutions at the TechConnect World trade fair on 16 and 17 June in Washington DC, USA, where it presented this and other results.

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