jueves, 8 de mayo de 2008

USE OF SILVER IN DISINFECTION











New disinfectant sprays with cutting-edge ingredient: just spray and disinfectant silver ions curb gunk and odor caused by bacterial infestation to preserve cleanliness. New disinfectant ingredient silver ions* eliminate bacteria by inhibiting its growth on surfaces in kitchens, bathrooms and toilets, through its unique disinfectant barrier which coats surfaces to curb infestation.
* New disinfectant ingredient silver ions: The new disinfectant silver ion ingredient featured in the figure above, is blended using Lion's proprietary technology which causes the mineral substance alumina silica to retain microparticulated silver ions on the surface. Just 15 nanometers in diameter or about one thousandth the size of typical silver particles, their microscopic size boosts disinfectant effectiveness, allowing them to fully penetrate and defend surfaces from bacteria.
New Engineering developments on the use of Silver disinfection, have overcome the problem of applying silver in a targeted and measured way by depositing the Silver nanoparticles on calcium phosphate nanoparticles deposited on a plastic polymeric film. When the plastic is placed on the desired surface, the bacteria or fungi trigger the flux of calcium and phosphate ions and the release of the Silver nanoparticles. This method can be 1000 times more efficient than conventional methods in controlling bacteria growth.



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GREEN CHEMICALS

The Green Seal certification is granted by the organization with that name and has a great number of members contributing with the requirements to pass a raw material or a chemical product as "green". Generally for a material to be green, has to comply with a series of characteristics like: near neutral pH, low volatility, non combustible, non toxic to aquatic life, be biodegradable as measured by oxygen demand in accordance with the OECD definition.
Also the materials have to meet with toxicity and health requirements regarding inhalation, dermal and eye contact. There is also a specific list of materials that are prohibited or restricted from formulations, like ozone-depleting compounds and alkylphenol ethoxylates amongst others. Please go to http://www.greenseal.com/ for complete information on their requirements.
For information on current issues regarding green chemicals, see the blog from the Journalist Doris De Guzman, in the ICIS at: http://www.icis.com/blogs/green-chemicals/.
Certification is an important — and confusing — aspect of green cleaning. Third-party certification is available for products that meet standards set by Green Seal, EcoLogo, Energy Star, the Carpet & Rug Institute and others.
Manufacturers can also hire independent labs to determine whether a product is environmentally preferable and then place the manufacturer’s own eco-logo on the product; this is called self-certification. Finally, some manufacturers label a product with words like “sustainable,” “green,” or “earth friendly” without any third-party verification.
“The fact that there is not a single authoritative standard to go by adds to the confusion,” says Steven L. Mack M.Ed., director of buildings and grounds service for Ohio University, Athens, Ohio.
In www.happi.com of June 2008 edition, there is a report of Natural formulating markets that also emphasises the fact that registration of "green formulas" is very confused at present, due to lack of direction and unification of criteria and that some governmental instittion (in my opinion the EPA) should take part in this very important issue.