In a first-of-its-kind study, researchers used an ingenious experimental setup and high-energy X-ray beams to observe a high-temperature, high-pressure chemical reaction to establish how the formation of two varied nanoscale crystalline structures in the metal cobalt is controlled.
The method enabled continuous analysis of cobalt nanoparticles as they formed from clusters that include tens of atoms to large crystals measuring 5 nm.
The study offers the proof-of-principle for a novel method to analyze the real-time formation of crystals, with prospective applications for other materials, such as oxides and alloys. The study data created “nanometric phase diagrams” that revealed the conditions controlling the structure of cobalt nanocrystals as they grew.
Published in the Journal of the American Chemical Society on November 13th, 2018, the study applied the U.S. Department of Energy-supported synchrotron X-ray beam lines at Argonne National Laboratory and Brookhaven National Laboratory. It was sponsored by the National Science Foundation.
Crystal formation in bulk cobalt prefers the hexagonal close-pack, or HCP, structure since it reduces energy to produce a stable structure. However, at the nanoscale, cobalt also tends to form the face-centered cubic, or FCC, phase, which possesses a higher energy. That can be stable because the total crystalline energy is affected by the high surface energy of tiny nanoclusters, Chen informed.
“When the clusters are small, we have more tuning effects, which is controlled by the surface energy of the OH minus group or other ligands,” he added. “We can tune the concentration of the OH minus group in the solution so we can tune the surface energy and therefore the overall energy of the cluster.”
In association with scientists from the Department of Materials Science at the University of Maryland and the two national laboratories, Chen and Xuetian Ma, a graduate research assistant, studied the polymorphic structures using experimental, theoretical, and computational modeling methods.
Image Credit: Allison Carter, Georgia Tech
News This Week
Nearly a third of physicians will be sued at least once in their careers — most commonly for an error in diagnosis. Medical errors are also the third-leading cause of death in the United [...]
Inventors and scientists have been continuously working towards reducing the size of technological components. Room-sized computers to laptops that are slimmer than a pane of glass? It’s done. Huge bulky telephones to smartphones that [...]
You have witnessed a variety of nano-devices that were designed for tasks including delivering medicines within the body. All of them used to move in a variety of ways. However, the latest nano-device is [...]
Netra Rajesh is an undergraduate Engineering Science student specializing in Biomedical Systems Engineering. She is currently on her Professional Experience Year (PEY) at the Massachusetts Institute of Technology where her research lies at the [...]
Nearly half of the companies in Europe that call themselves AI start-ups don't in fact use artificial intelligence, a new report found. The research, published Tuesday by London-based venture capital firm MMC Ventures, found [...]
A new quantum sensor developed by researchers at the University of Waterloo's Institute for Quantum Computing (IQC) has proven it can outperform existing technologies and promises significant advancements in long-range 3D imaging and monitoring [...]
Summary: Researchers use nanotech to enhance vision in mice, enabling them to see infrared light as well as visible light. Source: Cell Press. Mice with vision enhanced by nanotechnology were able to see infrared [...]
Immune Aspects of Biopharmaceuticals and Nanomedicines Available from CRC Press 1st Edition Raj Bawa, Janos Szebeni, Thomas J Webster, Gerald F. Audette The enormous advances in the immunology of biotherapeutics and nanomedicines in the [...]
Artificial Intelligence - Ethics, Governance and Policy Challenges by Andrea Renda and CEPS Think Tank released. About the report: CEPS is launching a Task Force to try to bring back the AI debate to [...]
The Nanofacturing consortium has worked on a pan-European nanopharmaceutical project to develop new manufacturing methods and improve supply chain co-ordination to advance treatments for rare cancers, autoimmune diseases and viral infections. The Nanofacturing collaboration [...]
You know those little motes or floaters you that you sometimes see moving in your vision? Well, someday very soon, those could be robots. An international team of medical researchers has unveiled a new [...]
Scientists at the Helmholtz Zentrum München, a partner in the German Center for Lung Research, have presented a new imaging method in the scientific journal ACS Nano ("Three-Dimensional Quantitative Co-Mapping of Pulmonary Morphology and [...]