The rise of nanometers

The industrial product design center of Snail Industry.

In the suburbs of Haifeng County, Shanmei.

Due to this swine flu crisis, the product design center was asked to design a new gas helmet.

The design of a gas helmet must comply with ergonomics, ensuring comfort and ease of use while ensuring performance.

More than a dozen designers are racking their brains, discussing design plans from time to time, or drawing design sketches on scratch paper or computers.

Team leader Wang Ningqing, after looking at everyone's plans, still had no satisfactory results.

In terms of design, most people have borrowed full-coverage helmets and switched to ultra-thin silicon nanoglass, which reduces the overall weight of the helmet.

But how to solve the problems of stuffy heat and shortness of breath?

"Team leader, I have an idea." Yin Min, who just joined the design center last month, raised her hand.

"Tell me."

Yin Min came to the small blackboard nearby and drew a simple diagram with a pen: "The stuffy feeling of a full-coverage helmet is actually because the inner layer of the helmet is close to the human body, making it difficult to dissipate heat. A hollow bracket is used to separate the inner layer from the skin. This should reduce some of the stuffiness.”

Wang Ningqing thought about it and felt that this solution was good. The helmet body made of ultra-thin silicon nanoglass was very light in weight, estimated to be only about one-fifth of an ordinary full-coverage helmet.

If the size is enlarged by three centimeters and the headgear hollow bracket is added, the weight is at most about one-third of that of an ordinary helmet.

It's just that this design, although it increases the internal space of the helmet so that the user does not feel too stuffy, will still make it stuffy over time.

Another designer suggested: "Team leader, you can add a small fan and a solar panel above your head."

"Small fans increase air flow and can indeed increase body heat dissipation."

"This design is not difficult."

After some discussion, they initially designed a gas helmet that is slightly larger than an ordinary helmet. It uses hollow brackets, a fan cooling system, and solar panels inside.

There is only one question left now.

That is the choice of filter. If you use melt-blown cloth for disposable masks, the melt-blown cloth must be replaced frequently.

If you use a gas mask filter tank, it will increase the overall weight of the helmet, and the filter tank is not permanent and needs to be replaced every once in a while.

Whether it is melt-blown cloth or filter canisters, they are not the anti-virus materials that Wang Ningqing imagined.

Knowing that his company had a materials laboratory, Wang Ningqing wrote a report and asked if there were other materials that could replace meltblown cloth or filter tanks.

After receiving this report, Lu Xuedong thought for a while and suddenly thought of the nanowire textile equipment being developed.

Although the current experimental nanowire textile equipment cannot mass-produce transistors on a large scale, there is no problem if it is used to make filtering nanonets.

In their experiments, the weaving precision was about 20 to 30 nanometers, and the gap formed by this precision was also 20 to 30 nanometers in size.

This gap is just right. In the virus family, the diameter of influenza virus is usually around 100 nanometers. Only a few foot-and-mouth disease viruses, bipartite viruses, etc. have diameters below 20 nanometers.

The nanofiltration mesh woven with nanowires can keep out most viruses.

Atmospheric gas molecules usually have a diameter of less than 1 nanometer and can pass through the nano filter unimpeded, allowing users to breathe comfortably.

Rushed to the laboratory.

When Zhang Jingjian and Xia Qiuzhen heard this request, they said there was no technical problem.

An experimental eight-needle nano-loom, plus eight silicon nanowire rolls. As the researcher pressed the set size, the nanowire loom soon started running, and the silicon nanowires were rolled out one by one. Weaved together to form a silicon nanonet with a gap of 22 to 24 nanometers.

A silicon nanocloth with a width of one meter is spit out from the cloth outlet of the loom. The edges of the cloth are sealed using laser sintering to ensure that the cloth will not unravel.

Cutting the cloth also uses laser cutting and laser sintering. A researcher uses a special clip to clamp out a cut piece of silicon nanocloth. The newly processed silicon nanocloth is not allowed to be touched at will.

The cloth is cut twice and divided into areas the size of masks, and then all are sent to the electroplating cabin for plating fixation.

After being attached by the silicon nanoplating, the gap size of the silicon nanocloth shrinks again, averaging only 21 to 22 nanometers.

Lu Xuedong picked up a piece of semi-finished product. Although it had been processed by silicon nano-coating, the flexibility of the cloth still remained very good, almost the same as ordinary nylon cloth.

He turned his head and ordered: "Conduct a filterability test immediately."

"No problem." Zhang Jingjian gave a few instructions to the researcher on the side.

Among the semi-finished products, 20 samples were selected and entered the testing area for comprehensive testing. After respective tests, the air could pass through unimpeded, while substances with a diameter of more than 23 nanometers were blocked from the outside.

When cleaning nanocloth masks, the high-pressure air on the inside can wash away the dust and foreign matter adsorbed on the outside to achieve full utilization.

Based on the material stability of silicon nanocloth, even if this thing is used for a hundred years, it will probably look like new.

Tried it as a mask, the breathing effect is better than the ordinary meltblown cloth mask, the skin contact feeling is very soft, as silky as silk.

It won't cover your face, because the silicon nanocloth is almost transparent and looks like a piece of plastic film.

Three days later.

Wang Ningqing's team, who is responsible for designing gas helmets, received silicon nanocloth in 10 sizes.

Looking at the relevant test reports in his hand, he was also very surprised. Although he knew that the company's materials laboratory was very accomplished in the research of new materials, in just three days, a sample with extraordinary performance was produced. Lightning speed.

After getting these semi-finished silicon nanocloths and the laser cutting sintering device provided by the scientific research department, Wang Ningqing's team quickly acted.

Based on the various characteristics of silicon nanocloth, Yin Min suggested: "Team leader, I suggest canceling the helmet's goggles and using integrated silicon nanocloth instead. After all, silicon nanocloth itself is almost transparent."

"It makes sense." Wang Ningqing agreed with this idea.

Changing the visor part of the helmet to silicon nanocloth may be better than using ordinary glass, because silicon nanocloth is very breathable and increases the gas exchange between the inside and outside of the helmet.

On the other hand, nanoscale silicon nanocloth itself also has some characteristics of non-stick coating, that is, it is difficult for foreign objects to stick to it.

For goggles, the water mist breathed inside and the water mist dust outside are a problem. After using silicon nanocloth, this problem is easily solved.

While improving the design plan bit by bit in the design center.

On Qin Lizhang's side, the report went directly to Ziguang Pavilion. After some secret investigation, it was found that the swine flu outbreak in the United States was indeed as described in the report, and even became more serious.

After lessons learned from SARS, the country did not take it lightly and immediately launched an emergency plan.

The airport and ports were put under martial law, and a special response office was set up to be highly vigilant about the introduction of swine flu from North America.

The China Centers for Disease Control and Prevention is doing a good job in research and preparing for a comprehensive response to a possible swine flu outbreak.

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