A5029208479- Aluminum Alloy Microstructure Properties
- Solidification and crystal growth phenomena
- Aluminum Alloys Composites Properties
- Magnesium Alloys: Properties and Applications
- Perovskite Materials and Applications
- Metallurgy and Material Forming
- Ferroelectric and Negative Capacitance Devices
- Advanced Memory and Neural Computing
- nanoparticles nucleation surface interactions
- Metallurgical Processes and Thermodynamics
- Hydrogen Storage and Materials
- MXene and MAX Phase Materials
- Semiconductor materials and devices
- Adhesion, Friction, and Surface Interactions
- Advanced ceramic materials synthesis
- Injection Molding Process and Properties
- Metallic Glasses and Amorphous Alloys
- Microstructure and mechanical properties
- Copper Interconnects and Reliability
- Advanced Chemical Physics Studies
- Corrosion Behavior and Inhibition
- Fusion materials and technologies
- Metallurgical and Alloy Processes
- Transition Metal Oxide Nanomaterials
- Conducting polymers and applications
Kookmin University
2016-2025
Materials Science & Engineering
1998-2023
Seoul National University
1996-2018
Pennsylvania State University
2006
Princeton University
2004
Significance In the past decade, countless studies have been performed to control mechanical and corrosion property of magnesium-based alloy, which degrades in physiological environment, overcome flaws inert implant materials shift paradigm conventional bone fixation devices. Controlled degradation Mg-5wt%Ca-1wt%Zn alloy results formation biomimicking calcification matrix at degrading interface initiate process. This process facilitates early healing allows complete replacement biodegradable...
Rare-earth-based double perovskite (DP) X-ray scintillators have gained significant importance with low detection limits in medical imaging and radiation owing to their high light yield (LY) remarkable spatial resolution. Herein, we report the synthesis of 3D crystals, namely, Cs
Crystalline Mg-based alloys with a distinct reduction in hydrogen evolution were prepared through both electrochemical and microstructural engineering of the constituent phases. The addition Zn to Mg-Ca alloy modified corrosion potentials two phases (Mg + Mg2Ca), which prevented formation galvanic circuit achieved comparable rate high purity Mg. Furthermore, effective grain refinement induced by extrusion allowed achievement much lower than Animal studies confirmed large revealed good tissue...
It was demonstrated that organolead halide perovskites (OHPs) show a resistive switching behavior with an ultralow electric field of few kilovolts per centimeter. However, slow time and relatively short endurance remain major obstacles for the realization next-generation memory. Here, we report performance-enhanced OHP device. To fabricate topologically electronically improved thin films, added hydroiodic acid solution (for additive) in precursor OHP. With drastically morphology such as...
The limited grain size (<200 nm) for transition metal dichalcogenides (TMDs) grown by molecular beam epitaxy (MBE) reported in the literature thus far is unsuitable high-performance device applications. In this work, fundamental nucleation and growth behavior of WSe2 investigated through a detailed experimental design combined with on-lattice, diffusion-based first principles kinetic modeling to enable large area TMD growth. A three-stage adsorption-diffusion-attachment mechanism identified...
We present a facile, one-step, polar-solvent-free sonochemical synthesis of series Mn-doped CsPbCl3 perovskite nanocrystals (PNCs) by varying the Pb-to-Mn ratio, after which their structure, morphology, and temperature-dependent photoluminescence (PL) properties are investigated. The partial substitution Pb2+ with Mn2+ in PNCs caused lattice contraction without affecting morphology structure. All exhibited dual-wavelength PL profiles, weak violet band at around 410 nm attributed to band-edge...
This study introduces a novel ZnSE electrode fabrication method, stabilizing the (002) crystal plane to reduce Zn dendrite growth, lower HER, and enhance corrosion resistance.
Niobium pentoxide (Nb2O5) is an interesting material with applications in Li battery and hybrid capacitor electrodes. The main limitation of this its low electronic conductivity. In study, H2 treatment introduced to address issue. Self-ordered Nb2O5 films were prepared by anodizing Nb foils subsequently treating them a atmosphere. Electron microscopy revealed that the film had hierarchical porous microstructure consisting macropores mesopores. X-ray diffraction analysis showed crystal...
Abstract Lead‐free halide perovskite‐based X‐ray scintillators with high light yield (LY) and low detection limit (LOD) have become a growing subject of research interest due to their promising application in wide range areas, from security healthcare. Herein, modified hot injection method is employed synthesize Mn(II)‐doped Cs 2 NaBiCl 6 double perovskite nanocrystals (DPNCs) examine scintillating properties for imaging detection. The DPNCs exhibit broad orange photoluminescence (PL) band...
Abstract Nanostructured transition metal oxides (NTMOs) have consistently piqued scientific interest for several decades due to their remarkable versatility across various fields. More recently, they gained significant attention as materials employed energy storage/harvesting devices well electronic devices. However, mass production of high‐quality NTMOs in a well‐controlled manner still remains challenging. Here, universal, ultrafast, and solvent‐free method is presented producing highly...
Pt nanoparticles (NPs) in a proton exchange membrane fuel cell as catalyst for an oxygen reduction reaction (ORR) fairly overbind and/or hydroxyl to their surfaces, causing large overpotential and thus low catalytic activity. Realizing Pt-based core-shell NPs (CSNPs) is perhaps workaround the weak binding of without shortage sufficient molecule dissociation on surface. Towards end, we theoretically examined activity using density functional theory; each NP consists one 12 different 3d-5d...
Abstract The size-dependent wettability of sessile water droplets is an important matter in wetting science. Although extensive studies have explored this problem, it has been difficult to obtain empirical data for microscale at a wide range diameters because the flaws resulting from evaporation and insufficient imaging resolution. Herein, we present quantitative change by directly visualizing three phase interfaces using cryogenic-focused ion beam milling SEM-imaging technique. With...
The interface energies and electronic structures of the interfaces between BCC Fe transition metal carbides have been investigated using first-principles calculations based on density functional theory. effects composition configuration properties determined. It was shown that Fe/TiC has highest energy formation complex leads to a significant decrease in energy. carbide (Ti0.5Mo0.5)C, which Mo present at interface, found be most stable. From analysis states, stability Mo-segregated...
The ferroelectric (FE) properties of 10-nm-thick Hf0.5Zr0.5O2 (HZO) films deposited by an atomic layer deposition technique were improved adopting O3 as oxygen source instead H2O. All HZO annealed at 400 °C for 1 min in N2 atmosphere after TiN top electrode deposition. Regardless the source, exhibited formation a noncentrosymmetric orthorhombic phase, which is responsible FE behavior with suppression monoclinic phase. However, compared to O3-based film, it was confirmed that H2O-based film...
Abstract Conventional manufacturing processes for aluminum matrix composites (AMCs) involve complex procedures that require unique equipment and skills at each stage. This increases the process costs limits scope of potential applications. In this study, a simple facile route AMC is developed, mixture Al powder ceramic reinforcement simply heated under nitrogen atmosphere to produce composite. During heating atmosphere, surface modification both induced by nitridation. When oxide layer...