In a recent study, researchers have succeeded in killing bacteria and germs using nanoporous plates made of gold and incorporating infrared light in which method all bacteria are got rid of in a few seconds.
Based on CDC reports, of every 25 patients in US hospitals one is the victim of health-care infections. Antibiotics and existing sterilization methods could stop harmful bacteria development, but still there are many defects on their side. Scientists at Huston University had found that, based on previous researches, Gold nanoparticles absorb light very rapidly and transform its photons into heat which in turn produces a high temperature in the environment and ultimately destroys surrounding cells.
These microscopic substrates are very thin. While a hair strand’s diameter size is between 50,000 and 100,000 nanometers, these plates’ thickness is in the scale of several hundred nanometers. To check the power of this method in destroying bacteria, researchers placed two types of heat-resistant bacteria (e.g. E. Coli) on the plate surface. Then, a beam of infrared light is irradiated onto the disk and surface’s heat is rapidly reaches to 180 degrees centigrade (356 Fahrenheit). They could generate thermal shocks throughout the matter by this method.
Researchers verified that this method kills all bacterial cells in 25 seconds. This was done by cell survival test and scanning electron microscopy (SEM). It was shown in this experiment that E. Coli was the most sensitive bacteria and could bear this temperature only five seconds. Two other heat-resistant bacteria which grow in hot water springs of Yellowstone National Park, were also destroyed in just 25 seconds. This team is currently working on the possibility of using nanoparticles as a coat for catheters against bacteria which could be helpful in reducing urinary tract infections in health-care settings. Another possible advantage of this method is in water filtration in which nanosubstrates could improve water quality by wiping bacteria out.
To see the full text of this article please visit https://doi.org/10.1364/OME.6.001217.