The reporter saw this mysterious material in the laboratory of the Polymer Science Department of Zhejiang University: its thermal conductivity is up to 2053W/mK (Watts per metre per kWh) - comparable to the world's most conductive material diamond in the world. It has created a new record for the thermal conductivity of macroscopic materials in the world. It is also ultra-flexible and can be folded 6,000 times and bent 100,000 times.

This is a new type of material “ graphene film” made by the team of Professor Gao Chao of the Department of Polymer Science of Zhejiang University. It solves the worldwide problem that the high thermal conductivity and high flexibility of macroscopic materials cannot be balanced.

In one of the world's leading academic journal "Advanced Materials", a new field of materials science an "Advanced Materials"), the High-team of professors published a related paper, this new material is expected in the next generation of flexible electronics, aerospace Other fields have gained important applications.

Or is it cold?

Not fragile

Most electronic devices have a "straight male" personality: strong thermal conductivity , but not flexible enough. For example, some inorganic ceramic crystal materials have very high thermal conductivity but are very fragile. It seems that a man is tall and handsome, but too maleistic, and collapses in a word;

For example, metal materials, although having good ductility, have a maximum thermal conductivity of about 429 W/mK. If the material is "men", the boyfriend is high, the quarrel will make you, but not cold.

It was not until the two professors of the University of Manchester, Andre Geim and Konstantin Novoselov, discovered the gentle and high-cooled graphene that solved the problem. The two won the 2010 Nobel Prize in Physics.

People have discovered the "ideal boyfriend", the carbon material of graphene, which provides a theoretical possibility for solving "consistent thermal conductivity and flexibility".

However, unfortunately, the powder type graphene which has been reported so far has a small number of sheets and many defects. The macroscopic materials assembled with them have poor thermal conductivity and flexibility, and are not comparable to the already commercialized graphite films.

What is a graphite film? It is used on the back of your phone . Its heat dissipation can basically withstand the high-power work of mobile phones, at most, it is a bit hot when playing games; the general graphite film is flexible and can be spelled together with plastic - no problem with bending, but folding A few times, it will break.

Where is the cow?

And graphite film PK

However, as a potential stock, graphene will certainly not be easily abandoned, as evidenced by the market interest in graphene concept stocks.

In 2013, the superb team produced the world's lightest solid material carbon sponge. On the day of the report, the graphene-related mainland stocks were all red.

This time, the superb team creatively proposed a new idea of ​​“large micro-pleated wrinkles” to prepare a graphene film—staggering a large piece of graphene to form a macroscopic graphene film, which can achieve high thermal conductivity; The graphene film is added to the micro-pleated structure to ensure sufficient flexibility when the material has sufficient stretching space during stretching and bending.

Yesterday, in the laboratory of Zhejiang University, Qianbao reporter saw the graphene film at a close distance for the first time. The color is similar to that of seaweed and soft like cloth.

What is the effect? The superb team bought a state-of-the-art mobile phone that is currently known as the backplane thermal film on the market. The graphite film behind the phone was used to compare the graphene films prepared by them with the graphene film:

First than thermal conductivity. The same is the game "King of the Kings", the phone through the graphite film to dissipate heat, the temperature measured at the CPU of the backplane is about 39 °C. Instead, the cell phone was replaced with a graphene film, and the back plate temperature was 33 °C.

Although there is only a difference of 6 °C, in general, the body temperature of the mobile phone is increased by 8-10 ° C. The higher the frequency of "high fever", the faster the scrapping period comes. The electronic product failure rate, more than 50% is due to high temperatures.

More flexible than that. At present, the most cattle graphite film material can be folded 6 times in the same direction. The superb team's graphene film can withstand more than 100,000 bends without affecting its thermal conductivity. Even more amazing is that this graphene film has not broken after repeated folding for 6,000 times.

In the future, the cause of mankind will still be related to the earth-based life of the earth and the exploration of the starry sky.

It is conceivable that if the mobile phone is bent on the wrist like a bracelet, at least the graphene film for heat conduction has overcome this problem.

The higher-end applications can also be embodied in the exploration of the universe, flying spacecraft flying out of space, but also facing the problem of saving materials, reducing weight, facing the sun, creating a huge temperature difference with the sun, and having a high flexural and high thermal conductivity. Materials can solve these problems together.

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