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

You are free to share this text 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 Zap Zone Defender System other biological material on wet surfaces. As well as, the group also found that, when the fabric is electrified, Zap Zone Defender it additionally kills bacteria. LIG is a spongy version of graphene, the only-atom layer of carbon atoms. The Rice University lab of chemist James Tour developed it three years ago by burning partway through a reasonable polyimide sheet with a laser, which turned the surface right into a lattice of interconnected graphene sheets. The researchers have since instructed makes use of for the fabric in wearable electronics and gas cells and Zap Zone Defender for superhydrophobic or superhydrophilic surfaces. "This type of graphene is extraordinarily 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 computer science as well as of supplies science and nanoengineering, whose team’s report appears in ACS Applied Materials and Interfaces.

When used as electrodes with a small utilized voltage, LIG turns into the bacterial equal of a backyard bug zapper. Tests with out the charge confirmed what has lengthy been identified-that graphene-based mostly nanoparticles have antibacterial properties. When 1.1 to 2.5 volts were utilized, the highly conductive LIG electrodes "greatly enhanced" these properties. Under the microscope, the researchers watched as fluorescently tagged Pseudomonas aeruginosa micro organism in an answer with LIG electrodes above 1.1 volts had been drawn towards the anode. Above 1.5 volts, the cells started to disappear and vanished utterly within 30 seconds. At 2.5 volts, bacteria disappeared almost utterly from the floor after one second. The lab partnered with Professor Christopher Arnusch, a lecturer on the Ben-Gurion University Zuckerberg Institute for Water Research who makes a speciality of water purification. Arnusch’s lab tested LIG electrodes in a micro organism-laden answer with 10 p.c secondary handled wastewater and located that after nine hours at 2.5 volts, 99.9 % of the micro organism had been killed and the electrodes strongly resisted biofilm formation.

The researchers suspect micro organism may meet their demise via a combination of contact with the rough surface of LIG, the electrical charge, and toxicity from localized production of hydrogen peroxide. The contact could also be something 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 dead micro organism from accumulating on the surface, Tour says. "The combination of passive biofouling inhibition and active voltage-induced microbial elimination will probably make this a highly sought-after material for inhibiting the expansion of troublesome pure fouling that plagues many industries," Tour says. Other authors include 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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