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Nano Nano headphones may "hear" cell infections.
According to foreign media reports, a 60nm diameter gold ball nanoheadphone became the most sensitive listening device ever, paving the way for the dubbing of silent movies by bacteria and other microbes.
Alexander and his colleagues at the University of Munich, Germany, suspended gold nanoparticles in a drop of water and captured a sphere from the laser beam, then fired a rapid pulse from another laser device to other spheres a few microns away. After the pulse hits the nanoparticle, the nanoparticle interferes with the surrounding water, causing pressure or sound waves.
The single nanoparticles that were captured by the laser then began to shake back and forth as if to respond to sound waves. In order to prove that this shaking is not simple due to the random behavior of water molecules, the researchers changed the frequency of sound waves. Each of these trapping particles changes as the frequency changes. And its direction of movement is also aligned with the direction of the sound wave. This further confirms that it responded to sound waves.
Andrei, who is also a member of the team at the University of Munich, said: "This tiny microphone can hear a negative 60 decibels at the lowest level. One millionth of this decibel level can be detected by the human ear, which makes the nano headset much better than any other. The listening device must be sensitive. We cannot find any other sound detection device that can detect sound waves with such high sensitivity."
Researchers say the technology may allow us to listen to those tiny creatures, including cells and viruses, in the future. Conducting this study also allows us to understand more about the mechanical properties of cells and how they are transformed into diseased cells.
Although Yang Changhui of California Institute of Technology in Pasadena is not a team member, he also supports this view. He said: "Vibration of living cells has been observed under the microscope, but no one can record their voices with a microphone. It is very interesting to follow this direction with this technique."
In 2008, researchers at MIT's Parker and Monica found that when red blood cells were infected with Plasmodium, their vibrations weakened, and it was clear that this was due to infection that caused the cells to become stiff.
Yang said: “This gold nanoparticle technology may eventually allow us to detect such changes. This creative technology will open up new research areas for us.†(passenger/compiler)
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