Chinese scientists will develop nano screens to filter haze

According to foreign media, it would be great if anyone could find a way to filter out fine particles in the air. Second, at least not let these pollutants enter people's lungs. The US “Wall Street Journal” website reported on February 27 that the first goal was difficult to achieve. But researchers at Stanford University in the United States found an attractive way to achieve the second goal. Using nanotechnology, they developed a low-cost filter that traps tiny particles in the air while remaining essentially transparent.

Scientists hope that one day the technology can be used on screens to improve indoor air quality while allowing light and air to pass through. An additional benefit is that this technology does not require energy, expensive equipment, and pipe supports.

It is no coincidence that some researchers come from China. Rapid industrialization in China has led to serious air pollution. Professor Cui Wei, a professor of materials science and the author of the paper at Stanford University, said that during the period of returning to China, the haze intensity shocked him.

According to reports, the scientist's goal is to have a diameter of 2.5 microns or less. These invisible particles are small enough to penetrate the lungs and impair health. Such substances are mixtures of dust, fumes, organic and inorganic liquids released by factories, coal-fired power plants, motor vehicles and heating systems.

Some cars and airplanes already use filters made of tiny fibers. Tiny pores on the fiber can trap particles. Purified water filters also use nanotechnology.

Dr. Cui's laboratory has studied the possibility of using this type of technology to make better batteries and warmer clothing, this time focusing again on spinning polyacrylonitrile, a material commonly used in surgical gloves. A tiny fiber with a diameter of one thousandth of the thickness of the hair filament is then formed into a thin film and covered on the gauze.

Researchers tested their inventions on a bad air day in Beijing in the summer of 2014 and found that they can capture 99% of particulates (dust, coal dust, and other particles harmful to the lungs) while maintaining a 77% transparency. Dr. Cui said that, compared with ordinary screens, the transparency is 80% to 85%. After measuring the absorption rate, scientists estimated that under heavy pollution, such screens can capture airborne particles for more than 300 consecutive hours.

The final filter becomes opaque. This is the signal that accumulates particles on the filter. The particles stick too hard to wash off. Dr. Cui said that the filter should be cheap enough and simply throw it away. Scientists are working on a method to achieve this, such as a nanofiber dressing that can be covered in a normal screen and peeled off after use.

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