Electricity Turns Graphene into ‘bug Zapper’ For Bacteria > 자유게시판

You're free to share this article beneath the Attribution 4.0 International license. Scientists have discovered that laser-induced graphene (LIG) can protect in opposition to "biofouling," the buildup of microorganisms, plants, or other biological material on wet surfaces. In addition, the workforce additionally found that, when the material is electrified, it additionally kills micro organism. LIG is a spongy model of graphene, the only-atom layer of carbon atoms. The Rice University lab of chemist James Tour developed it three years in the past by burning partway by means of a reasonable polyimide sheet with a laser, which turned the surface into a lattice of interconnected graphene sheets. The researchers have since prompt makes use of for mosquito zapper the fabric in wearable electronics and gasoline cells and for superhydrophobic or superhydrophilic surfaces. "This type of graphene is extraordinarily resistant to biofilm formation, which has promise for places like water-remedy plants, oil-drilling operations, hospitals, and ocean applications like underwater pipes which can be sensitive to fouling," says Tour, a professor of pc science as well as of materials science and nanoengineering, whose team’s report seems in ACS Applied Materials and Interfaces.

When used as electrodes with a small applied voltage, LIG turns into the bacterial equal of a backyard bug zapper. Tests without the cost confirmed what has long been identified-that graphene-based nanoparticles have antibacterial properties. When 1.1 to 2.5 volts had been applied, the extremely conductive LIG electrodes "greatly enhanced" these properties. Under the microscope, the researchers watched as fluorescently tagged Pseudomonas aeruginosa micro organism in a solution with LIG electrodes above 1.1 volts were drawn towards the anode. Above 1.5 volts, the cells began to disappear and vanished fully inside 30 seconds. At 2.5 volts, micro organism disappeared almost fully from the surface after one second. The lab partnered with Professor Christopher Arnusch, a lecturer on the Ben-Gurion University Zuckerberg Institute for Water Research who focuses on water purification. Arnusch’s lab tested LIG electrodes in a bacteria-laden answer with 10 percent secondary handled wastewater and located that after 9 hours at 2.5 volts, 99.9 % of the bacteria had been killed and the electrodes strongly resisted biofilm formation.

The researchers suspect micro organism might meet their demise by way of a mixture of contact with the tough surface of LIG, the electrical charge, and toxicity from localized production of hydrogen peroxide. The contact may be one thing like a knee hitting pavement, but in this case, the micro organism are all knee and the sharp graphene edges rapidly destroy their membranes. Fortunately, LIG’s anti-fouling properties keep useless micro organism from accumulating on the surface, Tour says. "The combination of passive biofouling inhibition and energetic voltage-induced microbial removal will probably make this a highly sought-after materials for inhibiting the growth of troublesome pure fouling that plagues many industries," Tour says. Other authors embody researchers from Ben-Gurion University of the Negev and Rice University. The United States−Israel Binational Science Foundation, the Canadian Associates of Ben-Gurion University of the Negev Quebec Region, the Israel Science Foundation, the Air Force Office of Scientific Research, and its Multidisciplinary University Research Initiative supported the analysis.

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