Trent University water scientist worries delay or cancellation will leave questions about nano-materials Posted: Mar 19, 2013 4:24 PM ET Last Updated: Mar 19, 2013 9:55 PM ET A scientist with an $800,000 federal grant will not be able to conduct his research due to the shuttering of the Experimental Lakes Area (ELA) in northern Ontario. Dr. Chris Metcalfe, who was set to contaminate a lake with nanosilver and document its effects on the lake's ecosystem, will have to put his experiment on hold. The grant for Metcalfe, of Trent University in Peterborough, Ont., came from the Natural Sciences and Engineering Research Council, a branch of the federal Department of Industry. - Nanosilver, an antibacterial technology made up of microscopic silver particles, is added to fabrics used in clothing to kill odours caused by sweating. www.cbc.ca/news/politics/experimental-lakes-closure-risks-federally-funded-research-1.1313905
Environ Health Perspect; DOI:10.1289/ehp.121-a220 Nanosilver: Weighing the Risks and Benefits
As a result, nanosilver has appeared in an increasingly wide range of products on U.S. shelves, among them electric shavers, athletic clothing, bed and bath linens, cosmetics, baby bottles, stuffed animals, keyboards, paints, and food containers. It’s also used in hospital equipment including catheters, stents, bandages, and wound dressings, as well as on surfaces including wheelchair seats and door handles. In Southeast Asia, nanosilver is used even more commonly and often openly; it has been sprayed in Hong Kong subways7 and touted on Korean toothpaste tubes,8 for example.
Despite its widespread use, nanosilver remains a fairly poorly understood material to both regulators and scientists. Consensus remains elusive on subjects as essential as how it behaves in the human body and the environment, and the extent to which its use may contribute to bacterial resistance.
Nanosilver impregnated into consumer products and coatings will slowly, through laundering, be abraded from its substrate material at varying volumes and over varying periods of time, depending on concentrations in the material and the strength with which it is bonded, says Bernd Nowack of the Swiss Federal Laboratories for Materials Science and Technology. In consumer textiles, he notes, the industry standard is for the antimicrobial effect to persist over at least 50 washes, although some research suggests nanosilver can leach from certain products within the first few washes.19
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Sept 17, 2013 8:24:45 GMT -8
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Nov 17, 2013 13:35:49 GMT -8
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Dec 13, 2013 18:04:49 GMT -8
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Dec 13, 2013 18:07:32 GMT -8
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Dec 13, 2013 18:10:43 GMT -8
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Dec 13, 2013 18:11:19 GMT -8
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Dec 13, 2013 18:12:01 GMT -8
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Dec 13, 2013 18:15:47 GMT -8
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Dec 13, 2013 18:18:07 GMT -8
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Dec 13, 2013 18:19:23 GMT -8
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Dec 13, 2013 18:22:51 GMT -8
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Dec 13, 2013 18:24:23 GMT -8
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Dec 13, 2013 18:26:34 GMT -8
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Dec 13, 2013 18:28:11 GMT -8