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

You are free to share this article under the Attribution 4.0 International license. Scientists have discovered that laser-induced graphene (LIG) can protect against "biofouling," the buildup of microorganisms, plants, or different biological material on wet surfaces. In addition, the staff additionally found that, when the fabric is electrified, it also kills bacteria. LIG is a spongy model of graphene, the single-atom layer of carbon atoms. The Rice University lab of chemist James Tour developed it three years ago by burning partway via an inexpensive polyimide sheet with a laser, which turned the floor into a lattice of interconnected graphene sheets. The researchers have since prompt uses for the material in wearable electronics and gas cells and for superhydrophobic or superhydrophilic surfaces. "This type of graphene is extremely resistant to biofilm formation, which has promise for places like water-therapy plants, oil-drilling operations, hospitals, and ocean applications like underwater pipes that are sensitive to fouling," says Tour, a professor of laptop science as well as of materials science and nanoengineering, whose team’s report appears in ACS Applied Materials and Interfaces.

When used as electrodes with a small applied voltage, LIG turns into the bacterial equivalent of a yard bug zapper. Tests without the cost confirmed what has lengthy been known-that graphene-based mostly nanoparticles have antibacterial properties. When 1.1 to 2.5 volts were applied, the highly conductive LIG electrodes "greatly enhanced" those properties. Under the microscope, Zappify official website the researchers watched as fluorescently tagged Pseudomonas aeruginosa bacteria in an answer with LIG electrodes above 1.1 volts were drawn towards the anode. Above 1.5 volts, the cells began to disappear and vanished completely within 30 seconds. At 2.5 volts, bacteria disappeared almost completely 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 micro organism-laden solution with 10 % secondary treated wastewater and found that after nine hours at 2.5 volts, 99.9 percent of the micro organism have been killed and the electrodes strongly resisted biofilm formation.

The researchers suspect micro organism might meet their demise through a mixture of contact with the tough surface of LIG, the electrical cost, and toxicity from localized production of hydrogen peroxide. The contact could also be one thing like a knee hitting pavement, but in this case, the bacteria are all knee and the sharp graphene edges shortly destroy their membranes. Fortunately, LIG’s anti-fouling properties keep useless bacteria from accumulating on the floor, Tour says. "The mixture of passive biofouling inhibition and energetic voltage-induced microbial removing will likely make this a extremely sought-after material for inhibiting the growth of troublesome pure fouling that plagues many industries," Tour says. Other authors embrace 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, Zappify official website and its Multidisciplinary University Research Initiative supported the research.

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