Metal nanoclusters have unusual optical properties that are of interest for fundamental reasons as well as for applications like diagnostic imaging and 3D printing. To better understand how nanocluster structure relates to optical properties, researchers performed high-pressure diffraction studies on single crystals of gold nanoclusters. Read more »
ALS Work Using Scattering/Diffraction
These techniques make use of the patterns of light produced when x-rays are deflected by the closely spaced lattice of atoms in solids and are commonly used to determine the structures of crystals and large molecules such as proteins.
How a Record-Breaking Copper Catalyst Converts CO2 Into Liquid Fuels
Scientists know that copper has a special ability to transform CO2 into valuable chemicals and fuels. But for many years, they struggled to understand how. Now, a research team has gained new insight by capturing real-time movies of copper nanoparticles as they convert CO2 and water into renewable fuels and chemicals: ethylene, ethanol, and propanol, among others. Read more »
Percolating Puddles in Rich Quantum Landscapes
Combining x-ray photon correlation spectroscopy (XPCS) with scanning micro x-ray diffraction (SµXRD), researchers found that charge density wave domains (known as “puddles”) in a nickelate material exhibit two types of dynamics: small puddles actively “percolate” (fluctuate in size and shape), while large puddles are more static. Read more »
Surface Charge and Nanoparticle Chromophore Coupling to Achieve Fast Exciton Quenching and Efficient Charge Separation in Photoacoustic Imaging (PAI) and Photothermal therapy (PTT)
Organic semiconductor nanoparticles (OSNs) convert absorbed light into heat, and are commonly used in photothermal therapy and photoacoustic imaging. Here, the OAN, Y6, is shown to form strong intermolecular packing, manipulated by surface charge under restrained sizes, yielding new pi-pi stacking and fast exciton quenching. The temperature of the tumor area can rise to more than 70 degrees under NIR irradiation, which can effectively ablate a tumor. Read more »
Uncompetitive, adduct-forming SARM1 inhibitors are neuroprotective in preclinical models of nerve injury and disease
Researchers describe potent small-molecule inhibitors that are neuroprotective in preclinical models of nerve injury and disease. The cover depicts the destruction of an axon by the enzyme SARM1, shown disproportionately large to convey its catastrophic role in driving degeneration once it is activated upon injury. Read more »
Watching Nanoparticle Chemistry and Structure Evolve
Using a multimodal approach, researchers learned how chemical properties correlate with structural changes during nanoparticle growth. The work will enable a greater understanding of the mechanisms affecting the durability of nanoparticles used to catalyze a broad range of chemical reactions, including clean-energy reactions. Read more »
Distinguishing Nanoparticles from Gas-Phase Species in Reacting Flows
Researchers developed a strategy for distinguishing between gas-phase species and newly formed nanoparticles in mixed gas- and particle-phase reacting flows. The approach uses small-angle x-ray scattering to study particle formation as it occurs by explicitly accounting for temperature-dependent scattering from gases. Read more »
Optical sensing of aqueous nitrate anion by a platinum(II) triimine salt based solid state material
Researchers present a new Pt(II) salt that enables the selective and quantitative measurement of aqueous nitrate anions without the need for pH adjustment. The method relies on the color change of the Pt(II) complex from yellow to red and an intense luminescence response, simplifying the detection process for on-site applications and expanding its applicability to broader matrices. Read more »
Protein Assemblies Show Surprising Variability
Protein-structure studies performed in part at the ALS helped researchers discover that the protein assemblies in a key carbon-cycling enzyme can rearrange with surprising ease. The findings raise the prospect of genetically tuning the protein in agricultural plant species to produce more productive and resource-efficient crops. Read more »
Valence tautomerism in a cobalt-verdazyl coordination compound
Valence tautomerization in inorganic chemistry typically involves the distribution of electrons between a metal center and redox active ligand, with potential application as molecular switches or other molecular devices. Here we report an example of valence tautomerization and an unusual electronic structure in a cobalt verdazyl complex. Read more »
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