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Spinning up antibacterial silver on glass
Date:6/27/2013

The antibacterial effects of silver are well established. Now, researchers at Yonsei University in Seoul, Republic of Korea, have developed a technique to coat glass with a layer of silver ions that can prevent growth of pathogenic bacteria including Escherichia coli, Salmonella typhimurium and Campylobacter jejuni. The technology could be used to protect medical equipment and be particularly useful for applications in disaster recovery and the military environment.

Materials scientist Se-Young Choi and colleagues Cheol-Young Kim, Yu-Ri Choi and Kwang-Mahn Kim, explain in the International Journal of Nanotechnology how silver has been known to be an antibacterial substance since the middle of the nineteenth century. It has found applications in bactericidal formulations for medical instruments and even odor-destroying socks

A big advantage of the use of this substance rather than organic agents against bacteria is that bacteria are yet to evolve resistance to it whereas genetic mutations that lead to proteins that can assimilate and degrade organic compounds frequently arise. As such, silver solutions have been used widely as disinfectants, in water purification in and in dentistry. Scientists have demonstrated that silver ions can latch on to sulfur-containing thiol groups in bacterial biomolecules disrupting their activity and thereby killing the microbes. Finding a way to add a permanent silver ion coating to glass would expand the antibacterial repertoire much further allowing a wider range of medical instruments, drinking vessels and other equipment to be kept sanitary regardless of working conditions.

The Seoul team has now developed a way to "spin" coat glass with silver present in a so-called sol-gel, a type of gelatinous solution within which are dispersed dissolved silver ions present as their nitrate salt. Spinning takes place at 200 Celsius with a rotation rate of 2000 revolutions per minute. T
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Contact: Albert Ang
press@inderscience.com
Inderscience Publishers
Source:Eurekalert

Page: 1 2

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