A5027802403- Advanced Battery Materials and Technologies
- Advancements in Battery Materials
- Advanced Battery Technologies Research
- Advanced Electron Microscopy Techniques and Applications
- Electron and X-Ray Spectroscopy Techniques
- Gold and Silver Nanoparticles Synthesis and Applications
- Graphene research and applications
- nanoparticles nucleation surface interactions
- Quantum Dots Synthesis And Properties
- Nanopore and Nanochannel Transport Studies
- Nanowire Synthesis and Applications
- Integrated Circuits and Semiconductor Failure Analysis
- Extracellular vesicles in disease
- Solar-Powered Water Purification Methods
- Nanoplatforms for cancer theranostics
- RNA Interference and Gene Delivery
- Characterization and Applications of Magnetic Nanoparticles
- Thermal Expansion and Ionic Conductivity
- Hydrogels: synthesis, properties, applications
- Pickering emulsions and particle stabilization
- Shape Memory Alloy Transformations
- Calcium Carbonate Crystallization and Inhibition
- Graphene and Nanomaterials Applications
- Enzyme Structure and Function
- Chalcogenide Semiconductor Thin Films
Korea Advanced Institute of Science and Technology
2018-2024
Research Institute of Industrial Science and Technology
2024
Government of the Republic of Korea
2020
Graphene liquid cell electron microscopy (GLC-EM), a cutting-edge liquid-phase EM technique, has become powerful tool to directly visualize wet biological samples and the microstructural dynamics of nanomaterials in liquids. GLC uses graphene sheets with one carbon atom thickness as viewing window container. As result, facilitates atomic-scale observation while sustaining intact liquids inside an ultra-high-vacuum transmission chamber. Using GLC-EM, diverse scientific results have been...
Plant-derived extracellular vesicles (EVs) are capable of efficiency delivering mRNAs, miRNAs, bioactive lipids, and proteins to mammalian cells. EVs critically contribute the ability plants defend against pathogen attacks at plant cell surface. They also represent a novel candidate natural substance that shows potential be developed for food, cosmetic, pharmaceutical products. However, although plant-derived acknowledged as having various industrial applications, little is known about how...
Utilization of in situ/operando methods with broad beams and localized probes has accelerated our understanding fluid-surface interactions recent decades. The closed-cell microchips based on silicon nitride (SiN x ) are widely used as “nanoscale reactors” inside the high-vacuum electron microscopes. However, field been stalled by high background scattering from encapsulation (typically ~100 nanometers) that severely limits figures merit for situ performance. This adverse effect is...
Substantial Fe substitution into a vanadium-based NASICON cathode is demonstrated to boost performance and materialize superior sodium ion battery.
Size-based filtration techniques have been developed for high-throughput isolation of extracellular vesicles (EVs). Conventional direct systems limitations in that large particles generally not only block the pores membrane but also damage because high fluid pressure. Here, we propose a cyclic tangential flow (TFF) system includes two membranes with pore sizes 200 and 30 nm, connected to peristaltic pump feeds stream flowing continuous circulation. The TFF is better able isolate specific...
Abstract Sulfide‐based all‐solid‐state batteries (ASSBs) are next‐generation batteries, which resolve the safety issues of energy storage systems. Elaborated intimate contact by providing constant external pressure using a customized cell is way to overcome chemo‐mechanical deterioration associated with interfacial issues; however, it not practical approach. Here, ASSBs evaluated adopting typical coin‐type at low (≈0.3 MPa) and confirmed that cathode more significant factor in lowering...
Ice, one of the most enigmatic materials on Earth, exhibits diverse polymorphism, with research mainly focusing commonly observed phases: hexagonal ice (Ih), cubic (Ic), and stacking-disordered (Isd). While their formation or structural changes are crucial for advancements in cloud science, climate modeling, cryogenic technology, molecular mechanisms driving these phenomena remain unexplored. Herein, utilizing transmission electron microscopy, we investigate at two different temperatures,...
Understanding of lithium polysulfide (Li-PS) formation and the shuttle phenomenon is essential for practical application lithium/sulfur (Li/S) cell, which has superior theoretical specific energy (2600 Wh/kg). However, it suffers from lack direct observation on behaviors soluble Li-PS in liquid electrolytes. Using situ graphene cell electron microscopy, we have visualized diffusion simultaneous with morphological phase evolutions sulfur nanoparticles during lithiation. We found that changes...
Abstract The recent advances in liquid‐phase transmission electron microscopy represent tremendous potential many different fields and exciting new opportunities. However, achieving both high‐resolution imaging operando capabilities remain a significant challenge. This work suggests novel situ platform of liquid‐flowing graphene chip TEM (LFGC‐TEM) equipped with viewing windows liquid exchange system. LFGCs are robust under high‐pressure gradients rapid circulation ranges covering the...
Abstract The electrochemical performance of all-solid-state batteries needs to be improved by addressing the poor stability against lithium metal anode and high interfacial resistance at cathode–solid electrolyte interface. Here, halide-doped Li 7 P 2 S 8 I–type (LPSI) solid electrolytes are synthesized that improve batteries. exhibit a higher ionic conductivity value 7.77 mS cm −1 than bare LPSI 3.96 , room temperature. is also stable anode, with calculated critical current density 1 mA −2...
Abstract Upconversion nanoparticles (UCNPs), as near‐infrared (NIR) absorbers, are promising materials for use in flexible NIR photodetectors, which can be applied wearable healthcare applications due to their advantages a broad spectral range, high photostability, and biocompatibility. However, apply UCNPs large‐area integrated devices, water stability micro‐patterning methods required. In this work, the encapsulated with siloxane polymer (UCNP@SiOx) via sol–gel process enable...
Abstract Single‐molecule techniques are powerful microscopy methods that provide new insights into biological processes. Liquid‐phase transmission electron (LP‐TEM) is an ideal single‐molecule technique for overcoming the poor spatiotemporal resolution of optical approaches. However, LP‐TEM limited by several challenges such as electron‐beam‐induced molecular damage, difficulty in identifying biomolecular species, and a lack analytical approaches conformational dynamics. Herein, graphene...
The mineralization dynamics of calcium carbonate is investigated under highly supersaturated conditions using graphene liquid cell transmission electron microscopy. We demonstrate that the process has three steps: nucleation, diffusion-limited growth, and Ostwald ripening/coalescence. In addition, we show polymorphs precipitate in a specific order, from metastable aragonite to stable calcite, thus proving Ostwald's rule stages. solutions, phase crystallizes manner, addition calcite phase.
Sequential growth and etching of Au nanoparticles in solution are observed situ using the graphene liquid cell electron microscopy. Observation reveals that concentration ions aqueous leads transition from nanoparticle to its etching. At each step, authors demonstrate different kinetics for both morphological evolutions reaction rates. This study will likely benefit design strategies with specific size or shape.
Graphene liquid cell transmission electron microscopy allows in situ observation of nanomaterial dynamics a environment. However, this method suffers from both random formation and small size pockets. Here, we introduce facile mass-producible graphene-sealed well-type cells with rational designs. The developed structure its mechanism depending on hole diameter (d)/spacer thickness (h) ratio are systematically analyzed. Finally, show high-resolution imaging chemical analysis capability for...
Understanding chiral coupling is an important topic in spintronics as it offers potential applications domain wall- or skyrmion-based magnetic memory logic devices. In this study, we investigate a single-layer ferrimagnetic GdCo film with in-plane anisotropy. We observe the emergence of local out-of-plane magnetization within layer, and importantly, find that these two orthogonal magnetizations are chirally coupled, which verified by shift hysteresis loop depending on initial configuration...
LiNixMnyCozO2 (NMC) is one of the most popular cathode materials for lithium-ion batteries. Li-rich NMC emerging as a potential candidate next-generation cathodes owing to its exceptional efficiency. The development high-performance requires demonstration structure–property relationships inherent in these complex, multicomponent systems. Herein, we construct map samples using convolutional neural networks (CNN). Our CNN models categorize crystal structure classification approach and predict...
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Abstract In the quest to develop endurable and long-lasting separators for lithium-ion batteries, recent studies have been focused on development of polyolefins-based that provide good mechanical strength but undergo high expansion at elevated temperatures. this research, we developed carboxymethyl cellulose nanofiber/ceramic composites as a coating layer separators. Compared pure ceramic-coated separator, composite-coated separator exhibits excellent thermal stability up 200°C negligible...