Scientific Events

Due to its high diffusivity hydrogen atoms alloy with metals even at room temperature. At this temperature, the materials microstructure remains rather stable. When the system size is reduced to the nano-scale, microstructural defects as well as mechanical stress significantly affect the ... [more]

New in-situ and operando techniques for correlative microscopy and chemical imaging : Case studies in mapping hydrogen and other low-Z elements in energy materials

Development of innovative characterization tools is of paramount importance to advance the frontiers of science and technology in nearly all areas of research. In order to overcome the limitations of individual techniques, correlative microscopy has been recognized as a powerful approach to obtain ... [more]

Mesoscale simulation of grain boundaries

The mechanical behavior of most metals in engineering applications is dominated by the grain size. Physics-based models of the interaction between dislocations and the grain boundary are important to correctly predict the plastic deformation behavior of polycrystalline materials. Dislocation-grain ... [more]
Our aim is to understand processes that lead to the emergence of catalytic function though direct observation using a combination of operando scanning and transmission electron microscopy. Starting with simple model catalysts, such as polycrystalline metal foils, we observe the propagation of ... [more]
Many of the functional materials we hope to leverage for next-generation technological applications — such as computing, energy harvesting and storage, or communication devices — draw their unique and sometimes exotic properties from a suite of interactions between the atoms, spins, and charges in ... [more]

Atomistic Dynamics of Deformation, Fracture and GB Migration in Oxides

In order to clarify the deformation and fracture mechanism in oxides such as Al2O3 and STO, TEM in situ nanoindentation experiments were conducted for their single crystals and bicrystals. We successfully observed the dynamic behavior of twin formation, twin-GB interaction, pile-up dislocation, jog ... [more]
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