The hottest nano cotton can be used to kill bacter

2022-08-08
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Nano cotton can be used to kill bacteria in water

cotton containing silver nanowires and carbon nanotubes can provide a cheap and effective method of purifying water for remote areas

this new type of filter can produce sterilization effect only by gravity and weak current. It has the characteristics of very low energy consumption and is suitable for portable water treatment equipment

"this fabric is easy to produce," said Professor Cui Yi of Stanford University in California, USA. His team simply soaked a piece of cotton in the carbon nanotube solution, and then used a pipette to drop the drops containing silver nanowires into the cotton to get this kind of nano cotton

according to the analysis of scanning electron microscope, carbon nanotubes will stick to a single cotton fiber, while slightly larger silver nanowires form a like structure between the cotton fibers. These nanoparticles can make the nano cotton conductive, so the weak current can pass through it, which helps to kill bacteria by destroying the outer membrane of bacteria. The rest is measured by the anti-bacterial effect of silver nanowires: through the large deformation measurement system or electronic extensometer (small deformation measurement)

so when he and his colleagues passed the water contaminated by E. coli through the conductive silver coated fabric, they found that 89% of the bacteria were killed. If they pass through three layers of such fabrics continuously, they can kill 98% of bacteria - so that the water can be drunk safely

after testing the fabric with other microorganisms, Professor Cui now wants to make sure that carbon nanotubes and silver nanowires are not washed into the water. Cui Yi said, "so far, the evidence shows that we have not succeeded in doing this."

"this is an interesting academic research," said Eric Hoek, a nano Engineer at the University of California, Los Angeles. He pointed out that testing whether potentially harmful and deadly carbon nanotubes have entered the water is a key step in the practical application level of this research

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