Three distinct crystalline phases with different electronic, magnetic, and optical properties were reversibly induced in a material through the insertion and extraction of ions by an electric field at room temperature. Such multifunctional materials are desirable for many applications, from smart windows to spintronics. Read more »
Science Highlights
A Closer Look at Dynamic Restructuring in Catalysts
Researchers have structurally and chemically “visualized” the surface of a silver–gold alloy as it reorganizes itself during catalytic activation. The insights gained from this methodology can lead to improved catalysts for energy-intensive industrial applications, thereby increasing efficiency and reducing waste. Read more »
New Evidence for a Water-Rich History on Mars
Mars may have been a wetter place than previously thought, according to experiments on lab-synthesized mineral samples serving as proxies for Martian meteorites. Shock experiments followed by x-ray diffraction studies showed how changes in the minerals could indicate a more water-rich history for the Red Planet. Read more »
APXPS Finds Carbonate Reversal at Liquid Interfaces
Aqueous carbonate systems are central to many processes essential to life, from the blood buffer system to the global carbon cycle. Using APXPS, researchers probed the concentration of carbonates near an interface, finding a surprising reversal in the expected abundances as a function of depth. Read more »
Strain Turns Tin into a 3D Topological Dirac Semimetal
A small amount of compressive strain turns a nonmetallic form of tin into a 3D topological Dirac semimetal—a kind of “supermetal” with very high electron mobility. With its rich topological phase diagram, the material shows promise for both novel physics and eventual device applications. Read more »
Modulating Infrared Light with 2D Black Phosphorus
Two-dimensional materials represent a promising new frontier in the field of optoelectronics. Most progress so far, however, has been in the visible-light range. Now, at the ALS, researchers have measured the infrared transmission spectra of ultrathin samples of black phosphorus under an applied electric field. Read more »
Bending the (β-Sheet) Curve to Shape Protein Cavities
Curved β sheets are basic building blocks of many protein cavities that, by serving as binding sites for other molecules, are essential to protein function. β-sheet curvature can now be controlled with atomic-level accuracy, opening the door to custom-designed sites capable of entirely new functions. Read more »
Mapping Catalytic Reactions on Single Nanoparticles
A new study confirms that structural defects and jagged surfaces at the edges of platinum and gold nanoparticles are key hot spots for chemical reactivity. The experiments should help researchers customize the structural properties of catalysts to make them more effective in fostering chemical reactions. Read more »
ARPES Overturns V2O3 Metal-to-Insulator Theory
Researchers report on angle-resolved photoemission spectroscopy (ARPES) measurements performed on the transition-metal oxide V2O3. The results overturn a decade-old theory about metal-to-insulator transitions in this material and provide a spectroscopic benchmark test for future models. Read more »
Multifunctional Catalyst Balances Stability and Efficiency
Scientists have found a way to engineer the atomic-scale chemical properties of a water-splitting catalyst for integration with a solar cell, and the result is a big boost to the stability and efficiency of artificial photosynthesis. Read more »
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