Scientists capture platinum crystals forming inside liquid metal for the first time, unlocking advances in hydrogen and materials tech.
Scientists have pulled off a rare feat of watching platinum crystals grow inside liquid metal in real time, a process that has remained elusive to researchers for decades.The breakthrough offers a striking window into how delicate metallic structures take shape under extreme conditions.
More importantly, it opens a path to designing new materials that could advance hydrogen production and support emerging quantum technologies.The work, led by the University of Sydney, used platinum crystals grown inside gallium to build an electrode capable of efficiently splitting water to generate hydrogen. The ability to make and tune such crystals could help unlock cleaner, more scalable hydrogen systems.Liquid metals like gallium make this advance especially compelling. At room temperature, gallium appears solid, but when warmed slightly above body temperature, it becomes a shimmering liquid metal.This unusual dual identity has long made it a target for engineers exploring next-generation “smart” materials.Crystals in motionWitnessing anything inside liquid metal has traditionally been impossible. Gallium is dense, tightly packed at the atomic level, and so opaque that even advanced microscopes cannot see through it.X-ray computed tomography reveals delicate structures in Gallium. Credit-Widjanana et al.“Witnessing the formation of crystals inside liquid metals like Gallium is a challenging task,” said Professor Kourosh Kalantar-Zadeh, who led the research. “It was a really special moment to be able to develop a method to do this.”The team turned to X-ray computed tomography, a medical-imaging technology typically used to map body tissues. By adapting this equipment, the researchers were able to peer inside a molten metal droplet and reveal the internal growth of platinum crystals in 3D.The images showed frost-like rods and branching formations blooming inside the gallium as the alloy cooled — structures that evolved over minutes and hours.Peering through metal“To see how liquid metals can be harnessed to shape the future of smart materials and identify those that play important roles in energy sources, we need to understand their metallic and chemical properties, inside and out,” Kalantar-Zadeh said.Liquid metal-grown crystals could be the key to creating new materials. Credit-Widjanana et al.Liquid metals have long intrigued engineers because they combine metallic conductivity with fluidity. They also act as powerful solvents.“Liquid metals are also very good solvents, with a powerful ability to dissolve other metallic elements, like sugar in water,” he said.In this study, researchers dissolved platinum beads in gallium or gallium-indium liquid metal at 500°C, then cooled the mixture to trigger crystal formation. The team imaged the alloy droplet in cross-sections and stitched the data into a full 3D model of how the crystals emerge.“We observed with fascination how metallic particles of various crystal orientations grew inside liquid metals by changing the temperature and environmental conditions,” said study co-author Moonika Widjajana.X-ray computed tomography revealed the internal details of the metallic crystals in 3D. Credit-University of SydneyShe added that X-ray computed tomography “can overcome the challenge of observing crystal growth within liquid metal – an opaque material that is usually impossible to penetrate with light and electrons.”Current imaging resolution limits the detail scientists can see, but rapid improvements in X-ray CT systems could soon reveal even finer structures and more dynamic chemical behavior during crystal formation.The study appears in Nature Communications.
Gallium Alloy Hydrogen Production Liquid Metal Crystals Materials Science Platinum Crystals Smart Materials X-Ray Tomography
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