The research team led by Zhu Yingjie, the Shanghai Institute of Ceramics, Chinese Academy of Sciences, successfully developed a new type of hydroxyapatite ultra-long nanowire-based filter paper that can efficiently remove PM2.5 fine particles, and a filter mask that uses it as a filter element. The relevant research results were recently published in the internationally renowned academic journal, "The Journal of Materials Chemistry A" of the Royal Society of British Chemicals, and have applied for an invention patent.
In recent years, fog and haze weather has frequently appeared and serious air pollution problems have attracted people’s attention. PM2.5 fine particles in the air seriously threaten people's health. PM2.5 fine particulates are particulates with an aerodynamic diameter equal to or less than 2.5 microns. The higher the airborne content, the more severe the air pollution. The most commonly used air filter products in daily life are filter masks. Commonly used gauze, non-woven fabrics and other filter media are used in the filter masks. The fibers are relatively thick and the pores between the fibers are relatively large, and they have large particles larger than PM10. Better filtration results, but it is difficult to efficiently remove PM2.5 fine particles in the air. Many filtering masks on the market currently have low filtration efficiency for PM2.5 fine particles, and some filter masks have poor air permeability. Therefore, it is urgent to develop filter materials and filter masks with high filtration efficiency and good air permeability to meet people's daily life and work needs.
Zhu Yingjie said that the new filter paper has good biocompatibility, environmental friendliness, non-toxicity and harmlessness, high flexibility, nanoporous structure, and strong surface adsorption capacity, and can effectively intercept, adsorb and filter air PM2.5 fine particles. High filtration efficiency. In order to significantly improve the breathability of the new filter paper, the team used hydroxyapatite ultra-long nanowires and plant fibers to form a multi-stage composite pore structure, making the new filter paper highly efficient and breathable; The filtration efficiency of PM2.5 and PM10 particles in air is higher than 95%, and the filtering efficiency is better than that of various commodity masks.
"More importantly, the new filter paper has a filtration efficiency of more than 95% for PM2.5 fine particles in air pollution environments with moderate, severe, and serious pollution, and can be embedded in daily filtration as a core filter material. Masks, to achieve effective protection of individuals in a variety of haze weather." Zhu Yingjie said that the new filter paper can be repeated many times and long-term use.
It is reported that the team has also developed a new type of hydroxyapatite ultra-long nanowire-based filter paper with antibacterial function, which has high-efficiency antibacterial activity against Escherichia coli and Staphylococcus aureus and other bacteria, and is expected to be applied to highly efficient antibacterial filtering masks. At the same time, the new filter paper is expected to be used as a high-efficiency filter element in air purifiers, air conditioners and other products.
The [Screw-Locking" tangless insert provides self-locking torque on the male member by a series of [chords" on one or more of the insert coils. With tangless inserts, no loose tangs are left behind, and they are the solution when foreign object debris (FOD) cannot be present in critical applications.
Screw Locking Tangless Insert,Tangless Screw-Locking Inserts,Key-Locking Screw Thread Inserts,Tangless Screw Locking Coil Threaded Insert
Shenyang Helisert Technology Co., Ltd , https://www.helisert.com