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Nanowires are only a few atoms wide and hundreds of thousands of times thinner than fiber. John Baiding, the head of the study and professor of chemistry at the University of Pennsylvania, said: "Like an incredible jeweler, string the smallest diamonds together and become a tiny diamond necklace. Because the center of the line is a diamond, we speculate that it might With exceptional hardness, strength and use."
For nearly a century, people have tried to compress independent carbon-containing molecules (such as liquid benzene) into an ordered, diamond-like nanomaterial that has not been successful. “We used the large high-pressure unit of Oak Ridge National Laboratory to compress 6 mm wide benzene – this number is enormous compared to previous experiments.†Co-author, Marko of Carnegie Institute of Science “We found that after fully compressing at room temperature, we slowly release the pressure, allowing the carbon atoms to react with each other and form a highly ordered carbon tetrahedral single-row chain, which becomes these diamond core nanowires.â€
According to a physicist organization network reported on September 21, the researchers compressed the molecule is benzene, containing 6 carbon atoms and 6 hydrogen atoms. During compression, the flat benzene molecules pile up, bend, break, and then, with the slow release of pressure, the atoms rejoin together in a completely different, yet highly ordered manner. The carbon atoms form a tetrahedral structure, the hydrogen atoms are "hanged" outside, and the tetrahedrons are connected to each other to form elongated nanowires.
The research team tested the nanowire structure of diamonds in a number of institutions and used a variety of techniques. The results showed that there were some imperfections in the nanowires, and they intend to continue to improve their structure. In addition, they hope to find ways to make more nanowires. “The high pressure required to make nanowires limits its production capacity and can only produce a few cubic millimeters at a time, so it is not enough for industrial scale.†Bai Ding said, “One of our goals is to eliminate this limitation and let These diamond nanowires can be produced under more realistic conditions."
These nanowires have a stable tetrahedral core and are the first member of a new class of materials, diamond-based nanomaterials. Bai Ding said that the formation of this new diamond nanowire with the natural arrangement of benzene molecules has made it possible to make more other molecules based on hydrocarbons, such as adding other atoms and combining them with nanowires. By squeezing the designed liquid, a large number of different materials can be produced. Diamond nanowires can make huge improvements in many industries, such as super-strong, lightweight cables, making it possible to build a "space ladder."
U.S. made the finest diamond nanowires to build a "space ladder"
Abstract Recently, chemists at Pennsylvania State University have discovered for the first time how to produce ultra-fine "diamond nanowires". The core of the diamond nanowire is made up of the basic unit structure of the diamond – the carbon atom is...
Recently, chemists at Pennsylvania State University have discovered for the first time how to produce ultra-fine "diamond nanowires." The core of the diamond nanowires is connected by the basic unit structure of the diamonds - the carbon atoms are connected end to end in a triangular tetrahedral structure, surrounded by a layer of hydrogen atoms. The researchers speculate that the diamond nanowires have extraordinary properties, strength and hardness that exceed the current strongest nanotubes and polymeric materials. Related papers were published in the September 21 issue of Nature Materials.