Answering the decision of germphobes and their Stepford ladies-in-waiting everywhere, researchers on the University of Birmingham have devised a silver-infused means of fending off unwanted bacteria. Eschewing the previously attempted, but short-lived coating method, these scientists have “developed a singular surface alloying technology” that infuses silver, nitrogen and carbon right into a newly germ-resistant stainless-steel surface. The team hopes this super durable steel will soon find its anti-bacterial way into hospitals and the surgical implements they employ — let alone your college cafeteria. Modern Lady Macbeth homemaker types can breathe a sigh of “Out, damn’d superbug spot” relief and come again to sealing up the furniture.
Posted on Tuesday 19th July 2011
Materials scientists on the University of Birmingham have devised a method of creating stainless-steel surfaces proof against bacteria in a project funded by the Engineering and Physical Sciences Research Council which culminated this week.
By introducing silver or copper into the steel surface (instead of coating it directly to the skin), the researchers have developed a way that not just kills bacteria but is extremely hard and immune to wear and tear during cleaning.
Bacteria resistant surfaces may be utilized in hospitals to forestall the spread of superbug infections on stainless steels surfaces, in addition to in medical equipment, for instance, instruments and implants. They’d even be of use to the food industry and in domestic kitchens.
The team has developed a unique surface alloying technology using Active Screen Plasma (ASP) with a purpose designed composite or hybrid metal screen. The combined sputtering, back-deposition and diffusion allows the introduction of silver right into a chrome steel surface, besides nitrogen and carbon. The silver acts because the bacteria killing agent and the nitrogen and carbon make the chrome steel much harder and sturdy.
The researchers replicated the cleaning process for medical instruments in hospitals. After cleaning the treated instruments 120 times they discovered that the antibacterial properties of the stainless-steel were still intact and the outside still immune to wear.
Hanshan Dong, Professor of Surface Engineering on the University of Birmingham and lead investigator, said: ‘Previous attempts to make stainless-steel immune to bacteria haven’t been successful as these have involved coatings that are too soft and never hard-wearing. Thin antibacterial coatings could be easily worn down when interacting with other surfaces, which results in a low durability of the antibacterial surface. Our technique implies that we avoid coating the skin, instead we alter the pinnacle layers of the outside.’
Professor Dong’s team are confident that this methodology can be utilized in the producing of stainless-steel products as they’re already capable of surface engineer items of as much as two metres x two metres inside the laboratory.
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