A team of scientists has unveiled a revolutionary imaging technique offering a glimpse into the incredibly fast world of atomic movement. The new method, capable of capturing activity in a trillionth of a second, promises to reshape our understanding of material science and perhaps accelerate breakthroughs in fields like energy and medicine. By visualizing the “dynamic disorder” within materials-the purposeful motion of atoms-researchers hope to unlock new efficiencies and functionalities in a wide array of technologies, building on work initially funded by a grant from the Department of Energy.
Scientists have developed a new imaging technique capable of capturing atomic activity with unprecedented speed – a trillionth of a second, or 250 million times faster than the fastest digital cameras currently available. This breakthrough allows researchers to observe what’s known as dynamic disorder in materials, a key factor influencing their properties and behavior.
Understanding how materials function at the atomic level is crucial for advancements in various fields, from energy storage to medicine. The new method, dubbed “variable pair distribution function” or vsPDF, provides a clearer picture of how atoms move and interact within a substance, influenced by factors like vibration or temperature changes.
“Only with this new vsPDF tool can we see this aspect of materials,” said Simon Billinge, a materials scientist at Columbia University in New York. “We’ll be able to watch the material and see which atoms are dancing and which are sitting still.”
The principle behind vsPDF relies on using neutrons to measure the position of atoms, rather than traditional imaging techniques. By tracking how neutrons scatter through a material, scientists can map atomic arrangements and detect subtle shifts in energy levels that reveal the speed of atomic motion. A slower “camera” speed, researchers explain, would result in blurred images, similar to trying to photograph a fast-moving athlete with a slow shutter speed.
This level of precision is vital for distinguishing between dynamic disorder – the purposeful movement of atoms that contributes to a material’s function – and static disorder, the random background vibrations that don’t. The ability to differentiate between the two provides deeper insights into a material’s complex behavior.
“It gives us a completely new way to unravel the complexities of what’s happening in complex materials, the hidden effects that might boost their properties,” Billinge added.
To test the technology, the researchers focused on germanium telluride (GeTe), a material widely used for converting waste heat into electricity or electricity into cooling. The observations made with vsPDF can help refine scientific models and improve our understanding of these processes.
While vsPDF shows significant promise, researchers acknowledge further development is needed before it becomes a widely adopted testing method. “We expect that the vsPDF technique described here will become a standard tool for bridging local and averaged structures in energy materials,” the researchers wrote in their published paper. The findings represent a significant step toward unlocking the full potential of advanced materials and could lead to innovations in energy efficiency and other areas.
