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Thin Copper and Silver Films Designed to Kill Bacteria

Posted in | Coatings and Thin Films

 


Dana Filoti of the University of New Hampshire will present thin films of silver and copper she has developed that can kill bacteria and may one day help to cut down on hospital infections. The antimicrobial properties of silver and copper have been known for centuries -- last year, the U.S. Environmental Protection Agency officially registered copper alloys, allowing them to be marketed with the label "kills 99.9% of bacteria within two hours." Copper ions are known to penetrate bacteria and disrupt molecular pathways important for their survival.



Using zeolite ceramic structures, Filoti is testing the hypothesis that the combination of silver and copper might work synergistically to better kill bacteria, work that she will present on November 12 at a meeting of the scientific society AVS in San Jose. "The hard ceramic structure looks like Swiss cheese and inside the holes there are ions of silver and copper," says Filoti.

By experimenting with the ratio of the two metals and the texture of the thin films, she has been able to reduce the amount of microbes present on the surface by 99 percent. One application of these antimicrobials, which Filoti is developing in partnership with a company in New Hampshire, is an antimicrobial face mask designed to protect against pathogens that cause many hospital-acquired infections.



The talk "Synergistic Ag (111) and Cu (111) Texture Evolution in Phase Segregated Cu1-xAgx Magnetron Sputtered Composite Thin Films" is at 10:40 a.m. on Thursday, November 12, 2009. Abstract: http://www.avssymposium.org/Open/SearchPapers.aspx?PaperNumber=TF-ThM-9

Posted Nov 10, 2009

 
 

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