Donghua University Develops 2-D Nanostructured Fibrous Air Filtration Materials

The increasingly serious problem of haze pollution has caused serious harm to human health, ecological environment and the global economy. It is urgent to strengthen protection and management. Because of its advantages of low energy consumption, simple operation and wide application scope, filtration method has become one of the important means to solve this problem. However, the existing air filtration materials generally have defects such as large diameter, large aperture, heavy material, poor filtration efficiency and air resistance, single function and so on, which severely limits the application performance of materials and the widening of their application fields.

Faced with this challenge, the nanofiber research team led by Yu Jianyong, academician of the textile science and technology innovation center of Donghua University and Professor Ding Bin, inspired by the natural biomaterial structure, such as spider web and honeycomb, have innovatively adopted the aramid / polyurethane two-component polymer solution, and prepared a new type of "rigid, flexible, and economical" high-efficiency, ultrathin and highly transparent two-dimension nano network structure fiber material through the capacitance capacitance electrostatic spray net technology. By controlling the dielectric properties of the receiving substrate to control the distribution of the micro electric field, the precise control of charged droplet ejection deformation self-assembly is achieved, which greatly improves the coverage of the nanostructure in the single fiber material (up to 10 times), thereby significantly enhancing the trapping ability of the network fiber material to the ultrafine particles. At the same time, the rigid and viscoelastic two component aramid / polyurethane system is organically combined with two dimensional network structure, giving the network fiber material "rigid and flexible" characteristics. Its material exhibits excellent structural stability and mechanical properties (41.3 MPa), so that the material can still filter high efficiency and low resistance to salt and oil super fine particles under the condition of holding ultra thin (350 nm) and Gao Touguang (85.6%). (sodium chloride PM0.3:99.984%, sebacic acid two isooctyl ester PM0.3:99.947%, and piezoresistive pressure is only 0.07% atmospheres). In addition, the nanoscale network fiber material can be effectively trapped and killed (the sterilization efficiency of ultraviolet irradiation is 90.5%). The pathogenic bacteria in the air have excellent biological protection function.

Structure and structure control of self assembled two dimensional nanostructure fiber materials

Filtration properties, transmittance and biological protection properties of self assembled two dimensional nanostructured fiber materials

The strategy of constructing self assembling two dimensional nano network structure fiber materials in this work not only provides a new idea for the preparation of high-performance, multifunctional ultra-thin air filtration materials, but also provides guidance and reference for the design and development of new high efficiency filtration / separation materials. The relevant results were published in ACS Nano.