The haze became a lingering shadow over the capital, occasionally extending its claws to disturb the deep blue sky above people's heads, and then fleeing in panic. Whenever smog appears, people close doors and windows tightly, reduce outings, wear masks... a series of protective measures are taken to block the "attack" of particles with a diameter less than 2.5 microns. However, although tightly closed doors and windows block PM2.5, they also hinder the circulation of air, making it difficult for indoor air to circulate in a timely manner.
To solve this problem, a team led by Wang Yulan, a senior engineer at the Institute of Nuclear Energy and New Energy Technology at Tsinghua University, has developed an "anti haze window screen", which has recently passed the acceptance of testing institutions such as the Beijing Physical and Chemical Analysis and Testing Center. The experimental results show that the barrier efficiency of the window screen for PM2.5 reaches over 98%. A window screen achieves both "opening windows for ventilation" and "preventing haze".
Thin film covered with super fine pores to block PM2.5
Ordinary film and simple printing - in fact, the so-called "anti haze window screen" looks no different from the ordinary screen window used at home. But unlike ordinary screen windows, this thin layer of film is covered with small holes that cannot be seen by the naked eye. Wang Xinxin, director of the Environmental Pollution Analysis and Control Research Laboratory at the Beijing Physical and Chemical Analysis and Testing Center, pointed to the film and said, "There are probably millions of molecular level small holes densely packed every square centimeter." Wang Xinxin further explained that molecular level small holes only allow molecules to pass through, so fine particles such as PM2.5 will be blocked by the film without affecting the passage of molecular components such as carbon dioxide.
The Physical and Chemical Analysis Testing Center spent over a month evaluating the effectiveness of anti haze window screens. The evaluation results show that the film can achieve a barrier efficiency of over 98% for PM2.5. In addition, due to its very thin film, this membrane has good air permeability, which enables efficient indoor and outdoor gas exchange. Harmful gases such as formaldehyde and benzene can also penetrate through small holes to create a fresh indoor air environment when the indoor concentration is high.
Please bring in clean air and let out polluted gases. A thin film can solve the big problem without making a sound.
Anti haze window screen has a service life of over 1 year
Wang Xinxin said that anti haze window screens have deployed the battlefield of people's "haze battle" more in advance. "Like the air purifiers we use now, haze first enters the room and is then purified; and this type of window screen directly blocks haze outside. If anti haze window screens are used in conjunction with air purifiers, it will definitely further improve the level of air purification
Compared to air purifiers, the lifespan prospects of window screens are also more promising. Air purifiers utilize the adsorption effect of filters, resulting in faster losses; For anti haze window screens, particles are not completely adsorbed on the film, but some particles will bounce off after being blocked. The entire process utilizes physical barriers and does not involve the issue of chemical reaction failure.
The anti haze window screen in the conference room of the Physical and Chemical Center has been in use for over a month, and there is no significant change in appearance color. In the past month, Beijing has issued multiple blue alerts for heavy air pollution.
At present, our conservative estimate for the service life of this product is more than one year. However, as for whether it needs to be cleaned or replaced after one year, we still need to continue conducting evaluation tests, such as evaluating the cleaning effect through water bottle spraying, which can help consumers save replacement costs
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