According to a report in the British "Independent" newspaper on the 8th, scientists at the Massachusetts Institute of Technology (MIT) created one of the lightest and hardest materials to date by pressing and melting graphene flakes - a porous three-dimensional graphene structure, Its shape resembles a sponge, with a density of only 5% of iron, but ten times more robust than iron.
Graphene is considered the most robust material in two-dimensional form, but researchers have struggled to convert the robust strength of its two-dimensional form into useful three-dimensional materials. In a recent study, the research team pressed together small sheets of graphene by applying heat and pressure to create a complex and stable structure resembling corals and diatoms. The new structure is called "spiral tetrahedron," its surface area is relatively large, but very strong.
Marcus Biller, head of the research team and director of the civil and environmental engineering department at MIT, explains: "This two-dimensional material, graphene, is one atom thick and possesses unique ruggedness and electrical properties, but due to being too slim, Difficult to make 3D materials, however, our latest research does that. "
Biller pointed out: "The geometry of a graphene that naturally forms under heat and pressure is complex and can not be produced by traditional methods." In the experiment, researchers used 3D printers to create structures thousands of times larger, And test it, got the above result.
The new study, published recently in Science Progress, shows that the superiority of the new structure is due more to this unique structure than to the material itself. This means that scientists can make other materials of the same geometry to obtain the same strength of lightweight materials.
Researchers believe that the same geometry can be applied even to larger pieces of structural material. For example, the cement used to make bridges can be made to the same cellular geometry, achieving the same level of strength while reducing weight. In addition, because this shape is filled with tiny pores, it is expected to be used to filter water or chemicals.
Edit Comment: clever structural design coupled with the 3D technology "blessing", press together small pieces of graphene with both "light" and "hard" features. The superiority of the new structure stems from the structure, which means that ordinary materials can also have comparable performance. Some experts have pointed out that material science research is changing from macroscopic to nanoscale, from the traditional materials processing technology to structural changes in atomic structure research. Material "designers" to build a different structure, so gorgeous material transform.
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