It is the hardest glass known to have the highest thermal conductivity of all glass materials.
Yingwei Fei and Lin Wang of Carnegie University are part of an international research team that is synthesizing a new form of ultra-hard carbon glass with a wide range of potential practical applications for devices and electronics. It is the hardest glass known to have the highest thermal conductivity of all glass materials. Their findings were published in temper tantrums.
Function follows form in understanding the properties of a substance. How the atoms are chemically related to each other, and the resulting structural arrangement, determines the physical qualities of a substance – both those that can be observed with the naked eye and those revealed only by scientific investigation.
Carbon is unmatched in its ability to form stable structures – alone and in combination with other elements. Some forms of carbon are highly structured, with a repeating crystal lattice. Others are more irregular, adjectives called amorphous.
The type of bond that holds the carbon-based material together determines its hardness. For example, soft graphite has a two-dimensional bond and hard diamond has a three-dimensional bond.
“Synthesizing amorphous carbon materials with three-dimensional bonds has become a long-term goal,” explains Fay. “The trick is to find the right starting material for the transformation with applied pressure.”
“For decades, Carnegie researchers have been at the forefront of the field, using laboratory techniques to generate extreme pressures to produce new materials or simulate conditions found deep within the planet,” added Carnegie Earth and Planetary Laboratory Director Richard Carlson.
Due to its very high melting point, it is not possible to use diamond as a starting point for glass compositions such as diamond. However, a research team led by Bingbing Liu of Jilin University and Minguang Yao – a former visiting researcher at Carnegie University – has made great progress using a form of carbon consisting of 60 molecules arranged to form a hollow sphere. This Nobel Prize-winning material, informally called buckyball, has been heated enough to destroy its football-like structure to wreak havoc before turning the carbon into crystal diamonds under pressure.
The team used a large multi-anvil press to create diamond-like glass. The glass is large enough for characterization. Its properties have been confirmed using various advanced high-resolution techniques to investigate atomic structure.
“Creating glass with these superior properties will open the door to new applications,” explains Fay. Using the new glass material relies on making large pieces, which has been a challenge in the past. The relatively low temperatures at which we were able to produce this new ultra-hard diamond glass made mass production more practical. “
Referensi: “Karbon amorf ultra-keras dari fullerene yang runtuh” oleh Yuchen Shang, Zhaodong Liu, Jiajun Dong, Mingguang Yao, Zhenxing Yang, Quanjun Li, Chunguang Zhai, Fangren Shen, Xuyuan Hou, Lin Wang, Nianqiang Zhang, Wei Zhang, Rong Fu, Jianfeng Ji, Xingmin Zhang, He Lin, Yingwei Fei, Bertil Sundqvist, Weihua Wang, Bingbing Liu, 24 November 2021, temper tantrums.
DOI: 10.1038 / s41586-021-03882-9