The world of graphene also has "Ma Ben" and "Yan Fei"

R&D fun

"In the world of animals, we will see wild horses running in groups, and the geese flying in the sky. Is there a similar phenomenon in the world of graphene? So, I want to lead the graduate students of the research group from the biological cluster effect. From the perspective of observing graphene.” On February 23, Dr. Gao Chao, a professor of polymer science at Zhejiang University, said in an interview with the Science and Technology Daily.

Hard work pays off. Gao Chao said, "On that day, we suddenly found in the study that the use of light to illuminate the graphene oxide solution will shine a variety of colors, which is very interesting. Using a polarizing microscope to further explore, the aqueous dispersion of graphene oxide has a special texture structure. The ability to specularly reflect and refract light, which means that liquid crystals are formed, that is, many graphene oxide sheets can be spontaneously arranged in a certain direction, like the horse geese in the animal world."

This discovery is like opening up a new research horizon, enabling researchers to not only study nanoscale graphene monoliths with the aid of a microscope, but also to study graphene as a cluster material. Thus, it is expected that the performance of the "king of new materials" at the microscopic scale will be translated to the macroscopic scale.

Since polymer liquid crystals can be spun, can graphene liquid crystals be spun? Gao Chao told reporters that his brain was suddenly "electricized" by this idea.

"In the beginning, 'spun' graphene is not going well. Seiko is also making a few centimeters of silk, like men's short hair, very discontinuous." Gao Chao recalled.

However, the researchers were not discouraged and did not give up. Gao Chao pointed out: "Since it can achieve graphene from the nanoscale to the size of the hair, it should be longer. Once the research has identified the direction, it is necessary to repeatedly try to succeed, this is a belief!"

Under the superb guidance, his doctoral student Xu Zhen consulted many textile professional books and materials, continued to experiment, and slowly made filaments like women's hair. After unremitting efforts, we finally spun a continuous graphene fiber of several meters in one day in 2011!

With these work accumulations, researchers can now easily spin out graphene fibers up to several hundred meters using traditional chemical fiber spinning equipment, which solves the international "how to assemble two-dimensional nanoparticles into continuous macro materials". Important scientific problems.

As a non-metal, graphene fiber exhibits very good electrical conductivity, is completely comparable to metal, and is also superior in weight, toughness and thermal conductivity. The future may be applied to heat dissipation, electrothermal and sensing materials for satellites, spacecraft and wearable devices.

In order to demonstrate flexibility, the researchers used graphene fibers as a knot and made a visual image of the naked eye. It was selected as one of the best scientific images of the 2011 internationally authoritative academic journal Nature.

This "knot" has made the super-study group "deeply in love" for graphene, and has been focusing on research for ten years.

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