This work explores a novel method to tune the electronic band structures of active semiconductor photocatalysts to gain insight into structure–property relationships. Taking silver orthophosphate (Ag3PO4) as an example, a static pressure technique was applied to modulate the band gap and indirect–direct band character via altering its crystal structure and lattice parameters. Read more »
Greenhouse gases cause the rising global temperatures associated with climate change. At the ALS, researchers have determined that palladium/zirconium catalysts can reduce greenhouse gases like methane and carbon dioxide by converting them into useful fuel. Read more »
“Molecular anvils” (diamondoids) were used to trigger chemical reactions using pressure, yielding products that differ from those produced in conventionally driven reactions with the same reactants. The discovery opens up new possibilities for the high-specificity synthesis of valuable but challenging molecules in an environmentally friendly process. Read more »
Researchers used x-ray fluorescence, spectroscopy, and diffraction to study how populations of symbiotic bacteria can act as a detox organ in a host with no organs. The bacteria, members of the species Entotheonella, accumulate and mineralize large quantities of arsenic and barium in sponges. Read more »
Resonant soft x-ray diffraction studies of a cuprate high-temperature superconductor revealed a 3D, long-range charge order—the first of its kind ever reported in a cuprate—that competes with superconductivity. A better understanding of such phenomena could help in the design of more robust superconductors with higher transition temperatures. Read more »
High-pressure experiments at Beamline 12.2.2 on ferropericlase—the presumed weakest mineral found in the Earth’s lower mantle—help explain why subducted slabs of Earth’s crust stall at a depth of around 1000 km (~625 miles). Read more »
Researchers at the ALS have recently observed peptoid nanosheets as they self-assemble at an oil–water interface. This development opens the door to designing peptoid nanosheets of increasing complexity and functionality for a broad range of applications, including improved chemical sensors and separators, and safer, more effective drug-delivery vehicles. Read more »
Printable plastic solar cells are a potential source of inexpensive renewable energy, but the transition from lab to factory results in decreased efficiency. Now, for the first time, a miniature solar-cell printer installed in a beamline allows researchers to use x-ray diffraction and scattering to figure out why. Read more »
New analysis of ancient Jian ware reveals that the distinctive pottery contains an unexpected and highly unusual form of iron oxide. This rare compound was only recently discovered and characterized by scientists and so far has been extremely difficult to create with modern techniques.
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Researchers studying organic material from dinosaur bones have been able to show that the samples contained original soft tissue material from Mesozoic dinosaurs. The x-ray techniques at the ALS were key to showing a possible mechanism for this unexpected preservation.
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