A5015690805- Advanced X-ray Imaging Techniques
- Advanced Electron Microscopy Techniques and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Electron and X-Ray Spectroscopy Techniques
- Particle Accelerators and Free-Electron Lasers
- Advanced Battery Technologies Research
- Digital Holography and Microscopy
- Advanced X-ray and CT Imaging
- Thermal properties of materials
- Concrete and Cement Materials Research
- Advancements in Photolithography Techniques
- Block Copolymer Self-Assembly
- Enzyme Structure and Function
- Nanoplatforms for cancer theranostics
- Advanced ceramic materials synthesis
- Mesoporous Materials and Catalysis
- Crystallography and Radiation Phenomena
- Supercapacitor Materials and Fabrication
- Extraction and Separation Processes
- Nuclear materials and radiation effects
- Radioactive element chemistry and processing
- Innovative concrete reinforcement materials
- Medical Imaging Techniques and Applications
Pohang University of Science and Technology
2016-2025
Pohang Accelerator Laboratory
2010-2025
Korea Post
2023
Pohang TechnoPark (South Korea)
2014-2020
Abstract O2-type lithium-rich layered oxides, known for mitigating irreversible transition metal migration and voltage decay, provide suitable framework exploring the inherent properties of oxygen redox. Here, we present a series oxides exhibiting minimal structural disordering stable retention even with high anionic redox participation based on nominal composition. Notably, observe distinct asymmetric lattice breathing phenomenon within driven by excessive redox, which includes substantial...
Lattice volume changes in Li-ion batteries active materials are unavoidable during electrochemical cycling, posing significant engineering challenges from the particle to electrode level. In this study, we present an elastic framework coating designed absorb and reversibly release strain energy associated with changes, thereby enhancing mechanical resilience at both levels. This framework, composed of multiwalled carbon nanotubes (MWCNTs), is applied nickel-rich LiNi
Hierarchically porous oxide materials have immense potential for applications in catalysis, separation, and energy devices, but the synthesis of these is hampered by need to use multiple templates associated complicated steps uncontrollable mixing behavior. Here we report a simple one-pot strategy inorganic with multiscale porosity. The precursor block copolymer are coassembled into an ordered mesostructure (microphase separation), while situ-polymerized organic forms organic-rich...
Abstract Tumors are 3D, composed of cellular agglomerations and blood vessels. Therapies involving nanoparticles utilize specific accumulations due to the leaky vascular structures. However, systemically injected mostly uptaken by cells located on surfaces cancer tissues, lacking deep penetration into core regions. Herein, an unprecedented strategy, described as injecting “nanoparticle‐loaded nanoparticles” address long‐lasting problem is reported for effective surface‐to‐core drug delivery...
Abstract Porous architectures play an important role in various applications of inorganic materials. Several attempts to develop mesoporous materials with controlled macrostructures have been reported, but they usually require complicated multiple‐step procedures, which limits their versatility and suitability for mass production. Here, a simple approach controlling the materials, without templates macropores, is reported. The solvent evaporation induces both macrophase separation via...
The Pohang Accelerator Laboratory X-ray Free-Electron Laser (PAL-XFEL) is a recently commissioned free-electron laser (XFEL) facility that provides intense ultrashort pulses based on the self-amplified spontaneous emission process. nano-crystallography and coherent imaging (NCI) hutch with forward-scattering geometry located at hard beamline of PAL-XFEL opportunities to perform serial femtosecond crystallography diffraction imaging. To produce high-density XFEL interaction positions between...
<title>Abstract</title> Achieving a comprehensive understanding of battery systems necessitates multi-length scale analysis, spanning from the atomic to macro scale, grasp complex interplay phenomena influencing performance. However, studies understand these in all-solid-state batteries (ASSBs) poses significant challenges due microstructural evolution involved, such as pore formation and contact loss resulting cathode material breathing, chemical degradation at interfaces, their interplay....
Transmission X-ray microscopy (TXM) is a powerful and non-destructive tool for interpreting the chemical states of wide range materials. It utilizes absorption near-edge structure (XANES) chemically sensitive mapping specific elements, making it particularly effective studying heterogeneous systems. However, specialized software required XANES imaging analyses to precisely align correct image drift, ensuring accurate fitting. To address this issue, we developed TXM-Pal, Python-based...
Abstract Ni‐rich layered oxides are envisioned as the most promising cathode materials for next‐generation lithium‐ion batteries; however, their practical adoption is plagued by fast capacity decay originating from chemo‐mechanical degradation. The intrinsic chemical–mechanical instability, inherited atomic‐ and nanoscale defects generated during synthesis, not yet resolved. Here, structural evolution solid‐state synthesis of cathode, Li[Ni 0.92 Co 0.03 Mn 0.05 ]O 2 , investigated using...
Mapping the large neural networks of animal and human brains is a fundamental but so far elusive task, because massive amount data consequent prohibitively long image taking processing times. We developed an effective strategy called "AXON" (Accelerated X-ray Observation Neurons) to solve this problem. AXON can achieve comprehensive whole-brain mapping within reasonable time by combining fast processing, plus two other critical performances: three-dimensional (3D) imaging with high isotropic...
BL-11C, a new protein crystallography beamline, is an in-vacuum undulator-based microfocus beamline used for macromolecular at the Pohang Accelerator Laboratory and it was made available to users in June 2017. The energy tunable range 5.0-20 keV support conventional single- multi-wavelength anomalous-dispersion experiments against wide of heavy metals. At standard working 12.659 keV, monochromated beam focused 4.1 µm (V) × 8.5 (H) full width half-maximum sample position measured photon flux...
The synchrotron-based hard X-ray nanotomography beamline, named 7C Nano Imaging (XNI), was recently established at Pohang Light Source II. This beamline constructed primarily for full-field imaging of the inner structures biological and material samples. normally provides 46 nm resolution still images 100 tomographic images, with a 40 µm field view. Additionally, large-scale application, it is capable 110 view an intermediate resolution.
Given the low absorption contrast of X-rays, phase shift has been playing an important role as alternative source in X-ray nanoimaging. Numerous phase-measuring techniques have proposed, most which, however, are based on significant assumptions or sample translations. In this study, we propose application Kramers–Kronig (KK) relations spatial domain a solution to allow quantitative image be directly calculated from measured intensity without any additional requirements. Based straightforward...
Owing to its unique penetrating power and high-resolution capability, X-ray imaging has been an irreplaceable tool since discovery. Despite the significance, resolution of largely limited by technical difficulties on lens making. Various lensless methods have proposed, but are yet relying multiple measurements or additional constraints samples. Here we present coherent speckle-correlation (CSI) using a designed diffuser. CSI no prerequisites for samples measurements. Instead, from single...
Nature designs circulatory systems with hierarchically organized networks of gradually tapered channels ranging from micrometer to nanometer in diameter. In most hard tissues biological systems, fluid, gases, nutrients and wastes are constantly exchanged through such networks. Here, we developed a biologically inspired, structure ceramic achieve effective permeation minimum void region, using fabrication methods that create long-range, highly interconnected nanochannel system biomaterial....
We developed an off-axis-illuminated zone-plate-based hard x-ray Zernike phase-contrast microscope beamline at Pohang Light Source. Owing to condenser optics-free and off-axis illumination, a large field of view was achieved. The pinhole-type phase plate affords high-contrast images cell with minimal artifacts such as the shade-off halo effects. setup, including optics alignment, is simple easy, allows faster easier imaging bio-samples.
The spatiotemporal heterogeneity of the state charge (SOC) within battery electrodes significantly impairs rate capability and cycle life lithium-ion batteries. However, mapping this is challenging owing to lack experimental methods that quantify SOC at electrode scale, while also offering nanoscale resolution for in-depth analyses individual particles. Herein, work reports an advanced projection X-ray microscopy combines nanometric resolution, a large field view, high chemical sensitivity...
In article number 1707557, Jinwoo Lee, Won Jong Kim, and co-workers demonstrate nanoparticle-loaded nanoparticles comprising large-pored silica gold operated by functional DNA. Depending on the pH gradient in cancer microenvironment, an elaborately programmed DNA transition induces dynamic behavior of nanoparticle with three stages: preferential accumulation cancerous region, deep penetration into 3D tissue, intracellular specific anticancer drug release.
For spectral imaging of chemical distributions using X-ray absorption near-edge structure (XANES) spectra, a modified double-crystal monochromator, focusing plane mirrors system and newly developed fluorescence-type beam-position monitoring feedback have been implemented. This major hardware upgrade provides sufficiently stable source during energy scanning more than hundreds eV for acquisition reliable XANES spectra in two-dimensional three-dimensional images. In recent pilot studies...