http://nanotechweb.org/articles/news/1/8/11/1
news
<http://nanotechweb.org/articles/news/1/8/10/1><< previous article
<http://nanotechweb.org/articles/news/1/8>more articles
<http://nanotechweb.org/articles/news/1/8/12/1>next article >>
Nanoparticles destroy bacteria
15 August 2002
Scientists at Kansas State University, US, have shown how magnesium oxide
nanoparticles can kill bacteria. The researchers published their work in
Langmuir.
"We had already reported that [magnesium oxide] nanoparticles were
biocidal, but this is the first publication that shows what happens to a
bacterium when it is touched by the particles," said Kenneth Klabunde of
Kansas State University. "These nanoparticle powders won't be as messy or
as corrosive as other biocides."
The magnesium oxide nanoparticles can destroy a bacterium in about five
minutes. The bacterium ends up visible as a "misshapen mess" in the
microscope, with dark splotches where nanoparticles have broken through its
lining. The researchers used three types of microscope in their study.
The nanoparticles have an electrical charge opposite to that of the
bacteria - so they are attracted towards them - and have sharp-edged
surfaces that can penetrate tough outer shells, such as those that protect
anthrax spores. What's more, the particles are bases, which soften the
exteriors of the bacteria and chemically damage them by "stealing"
electrons in the same way that chlorine does.
http://nanotechweb.org/articles/news/3/7/12/1
A nano-polymer a day keeps the microbes away
21 July 2004
Researchers at the University of Freiburg, Germany, have made a
nanoparticle-containing polymer network that can act against microscopic
organisms in several ways. The material repels bacteria and other microbes,
releases a biocide and can also kill the organisms on contact.
"[Our work] demonstrates the potential of making template polymer networks
for metal nanoparticles via readily available and relatively cheap starting
materials, and might have applications in coatings for medical devices to
keep them sterile," Joerg Tiller told nanotechweb.org. "There is also the
potential for catalytic or optical applications."
The scientists based their material on the fact that it's possible to form
silver nanoparticles within amphiphilically modified poly(ethylene imine)
(PEI) derivatives in solution.
[Colloidal silver, copper, zinc and virtually any metallic nano particle
and their ions have been known to kill bacterium for decades. Now, it's
suddenly "news" and scientists are hard at work figuring out how to do it
the hard way.
Can't sell it if it's "too" easy, ey?]
Ode
Ode
--
No virus found in this outgoing message.
Checked by AVG Anti-Virus.
Version: 7.1.375 / Virus Database: 267.14.21 - Release Date: 1/20/2006
--
The Silver List is a moderated forum for discussing Colloidal Silver.
Instructions for unsubscribing are posted at: http://silverlist.org
To post, address your message to: [email protected]
Address Off-Topic messages to: [email protected]
The Silver List and Off Topic List archives are currently down...
List maintainer: Mike Devour <[email protected]>
