When sodium atoms slip into the crystal structure of a porous material called MOF glass, something unexpected happens: the material becomes easier to shape and mold, unlocking decades of manufacturing challenges that have kept this remarkable substance confined to labs. An international team of researchers from TU Dortmund, the University of Birmingham, and four other European institutions has discovered that an ancient glassmaking trick—adding small chemical modifiers to change how materials behave when heated—works just as powerfully on these futuristic hybrids of metal atoms and organic molecules as it has on conventional glass for thousands of years.
The breakthrough matters because MOF glasses are extraordinary at trapping gases. They're porous, meaning they're riddled with tiny spaces that can capture carbon dioxide, hydrogen, and water vapor—all molecules central to solving climate change and enabling clean energy systems. But there's been a catch: MOF glasses only soften at temperatures above 300 degrees Celsius, dangerously close to the point where they degrade and fall apart. That narrow window has made them nearly impossible to manufacture at scale. Now, researchers have found a way to lower that temperature dramatically by introducing sodium or lithium compounds into the glass, making it flow more easily when heated.
The team's findings, published in Nature Chemistry on May 4, reveal exactly how this works at the atomic level. Using advanced nuclear magnetic resonance spectroscopy at the UK High-Field Solid-State NMR Facility, researchers led by Dr. Dominik Kubicki and Dr. Benjamin Gallant discovered that sodium ions don't simply fill empty spaces in the material. Instead, some sodium atoms replace zinc atoms, strategically loosening the glass network and weakening connections within its structure. This elegant rearrangement is what makes the material more workable.
The team then used AI-driven computational modeling to interpret their experimental data, with Professor Andrew Morris and Dr. Mario Ongkiko leading simulations that confirmed the theory at atomic resolution. Machine-learning assistance helped reveal patterns too complex for traditional analysis, showing precisely how sodium interacted with the glass and validating what the laboratory experiments suggested.
One of the best-known MOF glasses is ZIF-62, a porous material that can be melted and cooled while retaining its internal pores—making it invaluable for gas separation, membranes, and catalysis. For years, researchers have known what these materials could do; the problem has been making them in quantities that matter for industry.
"Glass has been part of human civilization for millennia," Dr. Kubicki noted, reflecting on how modifications to conventional glass, from ancient Mesopotamia to modern fiber-optic cables, have always come through these small chemical adjustments. "This discovery unlocks new possibilities for future high-performance materials," he said. Professor Sebastian Henke from TU Dortmund added that the principle borrowed from silicate glass engineering applies equally to these hybrid metal-organic materials, bringing MOF glasses "a step closer to real-world manufacturing and applications in gas separation, storage, catalysis and beyond."
The work involved teams from six institutions across Europe and represents a rare moment where ancient technique meets cutting-edge materials science. Scientists say additional refinement is needed—particularly to improve stability, predict behavior more accurately, and test performance in real applications. But the fundamental barrier, the one that confined MOFs to theoretical promise, has begun to crack.