Scientists evaluate different antimicrobial metals for use in water filters

May 24, 2012

Porous ceramic water filters are often coated with colloidal silver, which prevents the growth of microbes trapped in the micro- and nano-scale pores of the filter. Other metals such as copper and zinc have also been shown to exhibit anti-microbial activity.

Researchers from Princeton University in New Jersey used (AFM) measurements to study the adhesion interaction between Escherichia coli (E. coli) bacteria and colloidal silver, silver nanoparticles, and copper nanoparticles, as well as the interactions of the bacteria and the three different types of metal to porous clay-based ceramic surfaces.

As reported in the American Institute of Physics' (AIP) , of the three antimicrobial metals studied the silver nanoparticles had the highest affinity for E. coli bacteria. The colloidal silver had the highest affinity for a porous ceramic surface and is therefore the least likely to leach into the filtrate.

However, since the adhesion between colloidal silver and E. coli is in the same range as the adhesion between copper and the bacteria, copper may have potential as a less expensive disinfectant coating for ceramic water filters.

Explore further: Engineer helps poor in developing nations purify drinking water

More information: Adhesion of E. coli to Silver- or Copper-Coated Porous Clay Ceramic Surfaces, I. Yakub (1) and W.O. Soboyejo, Journal of Applied Physics.

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not rated yet May 26, 2012
Its no surprise this is what advocates for colloidal silver have been saying for decades, however there is a new type of colloidal silver, gold, copper and other metals that need to be tested. Colloidal Silver Atoms, the particle size is 250,000 times smaller than nanoparticles which render them more lethal to viruses and bacteria.

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