<\/p>\n
For greater than two centuries, scientists tried and didn’t grow dolomite within the lab under conditions thought to match the way it forms in nature. A recent study has finally modified that. Researchers from the University of Michigan and Hokkaido University in Sapporo, Japan succeeded by developing a brand new theory based on detailed atomic simulations.<\/p>\n
Their work solves a long-standing geological puzzle referred to as the “Dolomite Problem.” Dolomite is a widespread mineral present in iconic locations resembling the Dolomite mountains in Italy, Niagara Falls and Utah’s Hoodoos. It’s abundant in rocks older than 100 million years, yet it is never seen forming in newer environments.<\/p>\n
“If we understand how dolomite grows in nature, we’d learn latest strategies to advertise the crystal growth of contemporary technological materials,” said Wenhao Sun, the Dow Early Profession Professor of Materials Science and Engineering at U-M and the corresponding creator of the paper published in Science.<\/p>\n
Why Dolomite Growth Is So Slow<\/strong><\/p>\n The important thing breakthrough got here from understanding what disrupts dolomite because it forms. In water, minerals typically grow as atoms attach in an orderly solution to the surface of a crystal. Dolomite behaves otherwise because its structure is product of alternating layers of calcium and magnesium.<\/p>\n Because the crystal grows, these two elements often attach randomly as an alternative of lining up accurately. This creates structural defects that block further growth. The result’s an especially slow process. At that rate, forming a single well-ordered layer of dolomite could take as much as 10 million years.<\/p>\n Nature’s Built-In Reset Mechanism<\/strong><\/p>\n The researchers realized that these defects should not everlasting. Atoms which might be misplaced are less stable and more prone to dissolve when exposed to water. In natural environments, cycles resembling rainfall or tidal changes repeatedly wash away these flawed areas.<\/p>\n Over time, this process clears the surface so latest, properly arranged layers can form. As a substitute of taking hundreds of thousands of years for a single layer, dolomite can regularly construct up in far shorter intervals. Over long geological periods, this results in the big deposits seen in ancient rock formations.<\/p>\n Simulating Crystal Growth on the Atomic Level<\/strong><\/p>\n To check their idea, the team needed to model how atoms interact as dolomite forms. This requires calculating the energy involved in countless interactions between electrons and atoms, which is frequently extremely demanding by way of computing power.<\/p>\n Researchers at U-M’s Predictive Structure Materials Science (PRISMS) Center developed software that simplifies this challenge. It calculates the energy for certain atomic arrangements after which predicts others based on the symmetry of the crystal structure.<\/p>\n “Our software calculates the energy for some atomic arrangements, then extrapolates to predict the energies for other arrangements based on the symmetry of the crystal structure,” said Brian Puchala, considered one of the software’s lead developers and an associate research scientist in U-M’s Department of Materials Science and Engineering.<\/p>\n This approach made it possible to simulate dolomite growth over timescales that reflect real geological processes.<\/p>\n “Each atomic step would normally take over 5,000 CPU hours on a supercomputer. Now, we will do the identical calculation in 2 milliseconds on a desktop,” said Joonsoo Kim, a doctoral student of materials science and engineering and the study’s first creator.<\/p>\n Lab Experiment Confirms the Theory<\/strong><\/p>\n Natural settings where dolomite still forms today often experience cycles of flooding followed by drying, which supports the team’s theory. Nonetheless, direct experimental evidence was still needed.<\/p>\n That evidence got here from Yuki Kimura, a professor of materials science at Hokkaido University, and Tomoya Yamazaki, a postdoctoral researcher in his lab. They used an unusual property of transmission electron microscopes to recreate the method.<\/p>\n “Electron microscopes normally use electron beams simply to image samples,” Kimura said. “Nonetheless, the beam also can split water, which makes acid that may cause crystals to dissolve. Often that is bad for imaging, but on this case, dissolution is precisely what we wanted.”<\/p>\n The team placed a small dolomite crystal in an answer containing calcium and magnesium. They then pulsed the electron beam 4,000 times over two hours, repeatedly dissolving the defects as they formed.<\/p>\n After this process, the crystal grew to about 100 nanometers, or roughly 250,000 times smaller than an inch. That growth represented around 300 layers of dolomite. Previous experiments had never produced greater than five layers.<\/p>\n Implications for Modern Technology<\/strong><\/p>\n Solving the Dolomite Problem does greater than explain a geological mystery. It also offers insight into learn how to control crystal growth in advanced materials utilized in modern technology.<\/p>\n “Prior to now, crystal growers who desired to make materials without defects would attempt to grow them really slowly,” Sun said. “Our theory shows which you can grow defect-free materials quickly, should you periodically dissolve the defects away during growth.”<\/p>\n This idea could help improve the production of semiconductors, solar panels, batteries and other high-performance technologies.<\/p>\n The research was funded by the American Chemical Society PRF Latest Doctoral Investigator grant, the U.S. Department of Energy and the Japanese Society for the Promotion of Science.<\/p>\n<\/div>\n <\/p>\n","protected":false},"excerpt":{"rendered":" For greater than two centuries, scientists tried and didn’t grow dolomite within the lab under conditions thought to match the way it forms in nature. A recent study has finally modified that. 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