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The invention relates to a super flexible mesh cage structure nanofiber aerogel with anti-virus effect

Time : 2021-09-13 Hits : 13

The COVID-19 outbreak has increased the focus on personal protection. Fiber filter materials (such as medical masks, air conditioning filters, etc.) are essential equipment for daily protection and can effectively intercept air pollutants. , however, the existing fiber air filter material is micro fiber felt more, its fiber diameters, the defects of large aperture makes the filtration efficiency is low, it is difficult to satisfy the practical application of viruses in the tiny material such as interception, and typically do not have this material sterilization kill viruses, interception of microbes will grow further, easy to cause more serious secondary infection. Therefore, it is urgent to develop nano-fiber filtration materials with antibacterial and antiviral functions.


SCY for masks

Recently, a nanofiber research team led by Prof. Jianyong Yu and Prof. Bin Ding from Donghua University reported a super-flexible mesh cage structure nanofiber aerogel. By silane sol/SiO2 nano fiber/halide amine modifier further introduced in the dispersion of bacterial cellulose (BC) nanofibers, after freeze drying, the BC fiber in SiO2 form secondary fine network framework, which constitutes the fiber mesh structure, in the field of antibacterial antiviral air filtration material extremely potential applications.


Preparation process and performance of cage structure nanofiber aerogel

The researchers investigated the filtration efficiency and piezoresistance of aerogels with different BC nanofiber content on PM0.3. With the increase of BC content, the filtration performance and piezoresistance of aerogels gradually increased. When BC fiber content is 20wt%, the filtration efficiency of aerogel can reach 99.97%, and the piezoresistance is 189Pa. By further constructing three-dimensional structural models of SiO2 fiber aerogel and nano-fiber aerogel with cage structure, setting air parameters and particle size of filter particles, the distribution of air resistance and interception of solid particles by materials can be obtained. Compared with SiO2 fiber aerogel, net cage aerogel can intercept almost all particles, and BC secondary network inside aerogel can effectively intercept small particles. In addition, the resistance can be judged by the color of the air resistance field.


Air filtration performance and simulation of aerogels

In practical application process, after the polluted air by chlorination of aerogel, nano fiber mesh structure to intercept pollutants, especially the BC fine network can intercept bacteria, viruses and small particulate matter, the halide amine on the fiber mesh antimicrobial activity sites will release chlorine ions to completely kill interception of microbes, so as to avoid secondary pollution. At the same time, the chlorine released by the N -- Cl bond of the aerogel will also be consumed and become N -- H bond. When the aerogel is chlorinated again, the N -- H bond on the fiber network can be re-chlorinated into N -- Cl bond, realizing the cycle regeneration of bactericidal and virus-killing properties. The preparation of the material provides a new idea for the development of a new generation of antibacterial and antiviral air filtration materials.


Preparation process and performance of cage structure nanofiber aerogel

Tunneling Nanonets-Engineered Superflexible nanosized Aerogels with Hierarchical Cage-like Architecture Enables The topic "Renewable Antimicrobial Air Filtration" was published in Advanced Functional Materials.

Our product DTY 70D/24F/2、 SCY 7070/24 、SPANDEX 70D、SPANDEX 140D can be used to make mask ropes.

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