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Results for “Transmission Electron Microscopy”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Understanding important features of deep learning models for segmentation of high-resolution transmission electron microscopy images
Cutting edge deep learning techniques allow for image segmentation with great speed and accuracy. However, application to problems in materials science is often difficult since these complex models may have difficultly learning meaningful image features that would enable extension to new datasets. In situ electron microscopy provides a clear platform for utilizing automated image analysis. In this work, we consider the case of studying coarsening dynamics in supported nanoparticles, which is important for understanding, for example, the degradation of industrial catalysts. By systematically studying dataset preparation, neural network architecture, and accuracy evaluation, we describe important considerations in applying deep learning to physical applications, where generalizable and convincing models are required. With a focus on unique challenges that arise in high-resolution images, we propose methods for optimizing performance of image segmentation using convolutional neural networks, critically examining the application of complex deep learning models in favor of motivating intentional process design.
Towards data-driven next-generation transmission electron microscopy
Electron microscopy touches on nearly every aspect of modern life, underpinning materials development for quantum computing, energy and medicine. We discuss the open, highly integrated and data-driven microscopy architecture needed to realize transformative discoveries in the coming decade.
Quantum theory of electronic excitation and sputtering by transmission electron microscopy
Combining quantum electrodynamics with density functional theory, we model electronic excitation and sputtering by beam electrons in two-dimensional materials. Electronic excitations can drastically increase the sputtering rates in these materials.
In situ transmission electron microscopy as a toolbox for the emerging science of nanometallurgy
The paper describes a novel lab-on-a-chip approach that allows the observation of live nanoalloying and heat treatment at the nanoscale.
Automated High-Resolution Phase-Contrast Scanning Transmission Electron Microscopy
Here, in this presentation, we demonstrate the operation and applications of a custom-built automation program to acquire high-resolution data on an aberration-corrected STEM.
Lorentz Scanning Transmission Electron Microscopy Holography (LSTEMH) Measurement of Domain Walls in Fe/Gd Multilayers
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Theory of magnon diffuse scattering in scanning transmission electron microscopy
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Ta–Zr carbides: Synthesis advances via carbothermal reduction and defect evolution observed through transmission electron microscopy ion irradiation
The thermodynamic stability of six distinct compositions within the Zr—Ta—C ternary system is investigated in this study, marking the first report of their synthesis through carbothermic reduction in vacuum. A prolonged annealing process at 2200°C enabled high densification and phase equilibrium. Detailed phase identification and microstructural characterization through microscopy and X-ray diffraction techniques revealed clear compositional trends and stable phase formations. Two compositions ((Ta 0.2 Zr 0.8 )C 0.6 and (Ta 0.5 Zr 0.5 )C 1 ) were selected for ion irradiation experiments using 200 keV Kr + at 600°C—representing the first-ever irradiation study on the Zr—Ta—C system. The findings indicated defect accumulation and nanoscale cavity formation without any evidence of amorphization, highlighting the system's structural stability under irradiation. Together, the synthesis and irradiation results provide a basis for further investigation of the system and suggest its relevance for applications under extreme environments.
Revealing nanoscale mineralization pathways of hydroxyapatite using in situ liquid cell transmission electron microscopy
In-situ liquid TEM results reveal the co-existence of classical and non-classical nucleation paths during HA biomineralization.
Recent advances in the study of colloidal nanocrystals enabled by in situ liquid-phase transmission electron microscopy
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Soft matter and nanomaterials characterization by cryogenic transmission electron microscopy [Slides]
Abstract not provided.
Anthology of Transmission Electron Microscopy in Atmospheric and Materials Sciences [Slides]
Abstract not provided.
Connecting the Adhesion of Bimetallic Nanoparticles to Their Sintering Behavior via in situ Transmission Electron Microscopy Experiments
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