Meet the smog shield
——Microscopic view of the mask
Preface
Since the winter, the environmental problem - "haze" has become the focus of attention. Online reports on "smog" and "anti-smog" masks are constantly emerging. As a laboratory system solution provider, OPTON analyzes and studies the "haze" problem with its own microscopic view. At the same time, OPTON hopes to expand the understanding of the micro-world in life through microscopic analysis technology.
The theme of this issue is to enter the microscopic horizon of "Smog Shield - Mask". Through the electron microscope, we can observe and analyze the most effective and most effective PM2.5 masks used in the market, and take everyone to see the anti-fog mask under the electron microscope.
First, the mask is dismantled
Left: EPC activated carbon mask KN95; top right: Honeywell H950V; bottom right: Green Shield M95
All of the above three masks are masks with a filtration efficiency of more than 95%. EPC differs from the other two masks in that an activated carbon layer is added inside the mask.
Left: Honeywell H950V; Medium: Green Shield M95; Right: EPC Activated Carbon Mask KN95;
By cutting the cross section of the mask, it can be found that in addition to the classic mask structure of Honeywell, Green Shield [non-woven fabric - electrostatic filter cotton - non-woven fabric], EPC also has extra [activated carbon layer] and [plus Thick electrostatic filter cotton layer.
Second, the mask microscopic horizon
Non-woven fabric
Scanning electron microscopy of the outermost layers of the three brands (low magnification on the left and high magnification on the right)
The non-woven fabrics of the PM2.5 mask are formed by hot-rolling reinforcement. Therefore, it can be found from the three figures on the left that there will be a compact “flat pit†similar to the flattened on the non-woven fabric.
Among them, due to the different manufacturing processes of non-woven fabrics: Honeywell's non-woven fabrics are the densest and the "flat pits" are the deepest. The green shield's non-woven fabrics are the loosest and the "flat pits" are the largest and flat; EPC is between Between the two.
2. Static filter cotton
Scanning electron microscope morphology of three brands of electrostatic filter cotton (low magnification on the left and high magnification on the right)
The electrostatic filter cotton is also one of the non-woven fabrics, and it is electrostatically charged after being subjected to electrostatic treatment after the production of the nonwoven fabric. This electrostatic force adsorbs particulate matter in the gas passing through it, and is the main combat force for adsorbing PM2.5 particles in the PM2.5 mask.
It can be seen from the high-resolution picture on the right side of the figure: EPC's electrostatic filter cotton is the most compact, but the morphology is not uniform, there are band microscopic and spherical fiber particles; the green filter's electrostatic filter cotton fiber is the most uniform, and the filter Cotton is also relatively dense; Honeywell is somewhere in between.
3. Activated carbon layer + thickened electrostatic filter cotton
EPC activated carbon mask is two layers more than the other two (top right: activated carbon layer; bottom right: thickened electrostatic filter cotton layer)
The three brands of masks have more functions when the performance of the three brands is similar in each layer:
The activated carbon layer not only can adsorb particulate matter, but also collects a certain amount of gas in the air. From the upper right part of the figure, it can be seen that there is a large amount of activated carbon on the activated carbon layer.
The thickened electrostatic filter cotton layer is very different from the previous electrostatic filter cotton layer, and the small amount of particulate matter that has leaked is adsorbed again to further filter the particulate matter.
First, postscript
Microscopic analysis can observe the invisible details of the naked eye, which is of great significance to the process control and performance morphological analysis in actual production and life. It is one of the important technical means in reverse engineering.
In addition to EPC's N95 mask, there are many other brands of PM2.5 masks with activated carbon layers on the market. They are basically five-layer structure. The most obvious difference is that the masks containing activated carbon layers are light gray, and the price will be A little higher than the mask with the filter level.
At present, there are many brands and models of masks. I only choose the most online purchases for experiments. I will introduce the charm of microscopic analysis. How to judge the advantages and disadvantages of various styles of masks is not effective yet. Method, I hope to have further communication with you in the later stage.
About Ou Botong
Ou Bo Tong Co., Ltd. is a leading micro-nano technology service provider in China. It is a high-tech enterprise with foreign investment as its investment background. It is headquartered in the UK and is located in Beijing, Shanghai, Liaoning, Shandong, Henan and Shaanxi. There are branches and offices. As the most important strategic partner of Zeiss Electron Microscope in China, the company adheres to the business philosophy of “Building the most influential instrument sales brand in China†and is a strong alliance with the Zeiss brand. It is providing high quality for tens of thousands of Chinese users. Products with international cutting-edge technology services. In the future, we will continue to be committed to the innovation and development of China's micro-nano technology, and work together with our customers to paint a broad blueprint for the revitalization of China's high-end micro-nano technology!
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