BEIJING - Chinese scientists have developed a fire-resistant wallpaper that not only can withstand flames, but also detect fires and trigger an alarm if a fire occurs.The wallpaper was designed by scientists from the Shanghai Institute of Ceramics of the Chinese Academy of Sciences.Most of the wallpaper on the market today is made of highly flammable materials such as plant cellulose fibers or synthetic polymers, which can spread the fire rather than preventing it.The new wallpaper can withstand a high temperature of 1,000 degrees Celsius. It is made of an inorganic fire-resistant hydroxyapatite nanowire paper and a graphene oxide temperature sensor. The sensor is attached to the back of the wallpaper through a simple drop-casting process using an ink containing graphene oxide. It is then connected to the metal wire as an electrode.Graphene oxide is not electrically conductive at room temperature, but can become conductive at high temperatures, triggering the fire alarm device.The wallpaper is highly flexible and can be made into various shapes, dyed different colors, and printed with commercial printers.The research was published in the journal ACS Nano in March.Zhu Yingjie, the team leader, said that although the wallpaper is still in the early research phase, the research team is exploring low-cost mass production technology."We are also investigating more applications of the new fire-resistant inorganic paper, which might be used in other fields such as preserving important paper documents, battery separators, flame-retardant fiber-optic cables, catalytic paper, and flexible electronics," Zhu said. rubber bracelets24 hour silicone wristbandscustom silicone bracelets canadacheapest place to buy silicone wristbandscheap silicone wristbands free shipping
TIANJIN - China's northern coastal city of Tianjin aims to reduce its PM2.5 level by over 16 percent by 2020 from the level in 2017.Tianjian, a neighbor of Beijing and also a victim of smog, hopes to cut the average concentration of PM2.5 to 52 micrograms per cubic meter in 2020, compared with 62 micrograms per cubic meter recorded last year, according to a three-year work plan published by the municipal government on Monday.PM2.5, which refers to airborne particles smaller than 2.5 micrometers in diameter, poses a serious health risk.The city aims to replace rural families' use of coal for heating with clean energy, as well as cap its annual coal consumption at 40 million tonnes in 2020.In addition, the city will reduce the annual production capacity of crude steel by 6.9 million tonnes from 2018 to 2020 and limit the annual production capacity of steel at 20 million tonnes.Meanwhile, Tianjin will increase the number of new energy vehicles by 20,000 a year from 2018 to 2020, raising the ratio of new energy vehicles to 4.5 percent in 2020.From January to July, the average PM2.5 level in 28 Chinese cities that are prone to air pollution, including Beijing and Tianjin, declined by 13.9 percent year on year, according to the Ministry of Ecology and Environment.
