Research Highlights

Fluctuations in ultrasmall nanocrystals induce white light emission

Combined scanning transmission electron microscopy (STEM) observations and density functional theory (DFT) calculations show why nanoparticles, which typically emit monochromatic light at an energy tuned by their size, suddenly are able to individually emit white light. White-light...

Phase coexistence enables switching in strained BiFeO3

Highly strained films of multiferroic BiFeO3 are shown to exhibit a complex and temperature dependent coexistence of multiple phases, with a minority phase being a prerequisite to ferroelectric switching of the majority. Due to the simultaneous magnetic and ferroelectric...

LuFeO3: a new room-temperature multiferroic material

Atomically resolved scanning transmission electron microscopy (STEM) image of LuFeO3, a new room-temperature multiferroic. Red dots indicate the “buckling” of the Lu oxide plane, consistent with the polar structure.  

Hexagonal LuFeO3 is discovered to be...

Oxygen Controls Surface of Epitaxial Manganite Films

This atomically resolved study revealed a strong link between oxygen pressure and both surface-structure formation and growth dynamics in manganite thin films. The work provides key insights into controlling atomic-level behavior necessary for growing functional materials, such as...

Selective Crystallization of Sulfate-Water Clusters

This research was featured on the back cover of the journal for the September 1, 2015, issue (issue 36) (hi-res image) An effective approach to sulfate separation from aqueous solutions was developed based on crystallization of sulfate-water clusters with a...

3D Imaging of the Electrical Double-Layer Reveals Flaws

We discovered dislocations in the electrical double layer (EDL) in a room-temperature ionic liquid (RTIL) by direct 3D atomic force microscopy (AFM) imaging with molecular resolution. This unexpected discovery sheds new light on complex dynamics of solid-liquid interfaces and provides...

Epitaxial Strain Activates Oxygen in Complex Oxides

Researchers demonstrated that straining the crystal lattice of strontium cobaltite reduces oxygen content even under highly oxidizing conditions, The schematic represents strain control of oxygen stoichiometry in a SrCoO3-δ epitaxial thin film. Tensile strain is found to...

Doping strengthens magnetism in an iron-based crystal

Thallium-doping (5%) of BaFe2As2 crystal causes a surprising rise of the antiferromagnetic transition temperature (TN), related to Temperature-dependent heat capacity for Ba1-xTlxFe2As2shows an increase in magneto-elastic anomaly at...

Selective Crystallization of Sulfate-Water Clusters

An effective approach to sulfate separation from aqueous solutions was developed based on crystallization of sulfate-water clusters with a simple ligand self-assembled in situ from water-soluble subcomponents. 

With a free energy of hydration of –1080 kJ/mol, sulfate is one of...

Strategy shown for novel tire-derived carbon anodes for sodium-ion batteries

Researchers have demonstrated a process to prepare morphologically tailored carbon materials with good electrochemical capacity Shown are scanning transmission electron microscopy of sulfonated tire-derived carbon treated at 1,100oC (left) and data from a long-...

Key to mechanical reinforcement of glassy polymer nanocomposites has been unraveled

Scientists have unraveled details of the mechanism of mechanical reinforcement in glassy polymer nanocomposites.1 Measurements in the interfacial layer ~2–4 nm around nanoparticles revealed that Young’s modulus, which defines the relationship between stress and strain in a...