![]() It's such a basic material when you write down the chemical formula, it's BO. "What really excites me is just the fact that this is an old problem. They were surrounded by graphite heating elements, introduced into pyrophyllite cubes having the dimensions 20×20×20 mm 3, and placed into a multianvil high-pressure high-temperature device 3. Understanding the structure of this one could lead to the synthesis of other useful boron-based 2D materials. Powder samples of -MgH 2 were pressed into pellets and put into boron nitride crucibles. Once they land, they are not perfectly aligned, but they remain in a stack.Īccording to Perras, there has been a lot of recent interest in synthesizing new boron-based 2D materials. He explained that these stacked nanosheets are like a stack of paper thrown onto a desk. "We also applied a lot of other techniques, including powder X-ray diffraction, which showed that these nanosheets organized themselves into what's called a turbostratic arrangement," said Perras. Basically, we found that adjacent precursor molecules were getting organized parallel to each other, which matched one of the previously proposed models," Perras said. "So we developed some NMR methods that allow us to study the orientation of these building blocks relative to each other. The key to understating the structure is to figure out how the blocks are physically arranged. These molecules stick together through dehydration reactions. Perras explained that boron monoxide is made using a precursor molecule that acts like building blocks. "Because of our expertise in nuclear magnetic resonance spectroscopy, and the development of new methods to which people in the 40s, 50s, and 60s didn't have access, we thought that we might be able to lay this nearly century old mystery to rest," said Perras. Luckily, technology for materials research has advanced since the 1940s. This research is further discussed in the paper published in Journal of the American Chemical Society. Unfortunately, previous scientists were unable to determine the structure of the material. Through their research, they came upon literature dating back to 1940 that contained descriptions of the exact reaction the team was working on, and the synthesis of a material called boron monoxide. The team ended up making a boron-based material that Perras said was difficult to characterize. Perras' and Huang's groups are interested in these materials for alternative energy applications. "However, after many synthesis trials, we could not get a highly crystalline covalent organic framework material," said Wenyu Huang, another scientist from Ames Lab and member of the team. It is composed of organic molecules that are linked together through covalent bonds. "We were actually trying to make a carbon-free covalent organic framework." A covalent organic framework is a low-density and porous material with a periodically ordered crystal structure. "We initially weren't really looking into studying this particular material," said Frédéric Perras, a scientist from Ames Lab and member of the research team. ![]()
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