Researchers have demonstrated a prototype device that can rid hands, feet, or even underarms of bacteria, including the hospital superbug MRSA.
The device works by creating something called a plasma, which produces a cocktail of chemicals in air that kill bacteria but are harmless to skin. A related approach could see the use of plasmas to speed the healing of wounds.
Writing in the New Journal of Physics, the authors say plasmas could help solve gum disease or even body odour.
Plasmas are known as the fourth state of matter, after solid, liquid, and gas. They are a soup of atoms that have had their electrons stripped off by, for example, a high voltage. But the new research focuses on so-called cold atmospheric plasmas.
Rather than turning a whole group of atoms into plasma, a more delicate approach strips the electrons off just a few, sending them flying. Collisions with nearby, unchanged atoms slows down the electrons and charged atoms or ions they leave behind.
It has been known for some time that the resulting plasma is harmful to bacteria, viruses, and fungi - the approach is already used to disinfect surgical tools.
The plasma produces a series of over 200 chemical reactions that involve the oxygen and nitrogen in air plus water vapour - there is a whole concotion of chemical species that can be lethal to bacteria
To produce plasmas efficiently at low cost so you can really mass produce these things for hospitals, that's the big breakthrough of the last year," Professor Morfill said.
The team says that an exposure to the plasma of only about 12 seconds reduces the incidence of bacteria, viruses, and fungi on hands by a factor of a million - a number that stands in sharp contrast to the several minutes hospital staff can take to wash using traditional soap and water. |