Electrified Graphene Turns Into A Bacterial Bug Zapper

Graphene's long listing of achievements is just a little longer right now, as researchers from Rice University have used the fabric to make a bacterial bug zapper. A form of the fabric referred to as laser-induced graphene (LIG) has previously been found to be antibacterial, and now the group has found that those properties might be kicked up a notch by including just a few volts of electricity. The Rice crew, headed up by Professor James Tour, first created LIG in 2014 by using a laser beam to etch patterns right into a sheet of polyimide. That churns up the material into a porous graphene foam, which has been discovered to be efficient at preventing microbes from building up on its surface. To further test LIG's bacteria-blasting talents, the researchers took a sheet of polyimide and used a laser to turn half of the floor into LIG. The fabric was then positioned in a solution filled with Pseudomonas aeruginosa bacteria, and a small charge was run via the LIG electrodes.



At 1.1 volts, the micro organism, which had been fluorescently tagged so the researchers could see them clearly, had been attracted to the LIG anode and moved in direction of it, like a bug zapper. At 1.5 volts, best bug zapper the bacteria that came into contact with the LIG had been killed within 30 seconds, and when the juice was cranked as much as 2.5 volts, it only took one second for them to disappear almost entirely. And since LIG is already a superb antifouling materials, the useless bugs don't accumulate on its floor. Next up, the researchers tested the material as a water-purification method, leaving these LIG electrodes in an answer of bacteria and partially-handled wastewater. After 9 hours at 2.5 volts, the zapper had killed 99.9 p.c of the bugs, with out forming much of a biofilm on the surface. The scientists aren't certain exactly what's killing the bacteria, but the situation they suspect sounds fairly gruesome. First the sharp edges of the graphene pierce their cell membranes, then the cost electrocutes them, and any remaining survivors are then rapidly poisoned by the hydrogen peroxide that's created in the method.



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