A5084412056- Electromagnetic wave absorption materials
- Advanced Antenna and Metasurface Technologies
- Magneto-Optical Properties and Applications
- Magnetic Properties of Alloys
- Metallic Glasses and Amorphous Alloys
- Magnetic properties of thin films
- Metamaterials and Metasurfaces Applications
- Photonic Crystals and Applications
- Nanomaterials for catalytic reactions
- Magnetic Properties and Synthesis of Ferrites
- Rare-earth and actinide compounds
- Supercapacitor Materials and Fabrication
- Hydrogen Storage and Materials
- Photonic and Optical Devices
- Extraction and Separation Processes
- Optical Coatings and Gratings
- Advancements in Battery Materials
- Surface Roughness and Optical Measurements
- Powder Metallurgy Techniques and Materials
- Recycling and Waste Management Techniques
- Metal and Thin Film Mechanics
- Advanced Measurement and Metrology Techniques
- Gold and Silver Nanoparticles Synthesis and Applications
- Geochemistry and Elemental Analysis
- Characterization and Applications of Magnetic Nanoparticles
Iowa State University
2024
Chungnam National University
2016-2024
United States Department of Energy
2024
Korea Institute of Materials Science
2019-2023
Korea Institute of Geoscience and Mineral Resources
2019-2022
SRKR Engineering College
2017-2019
PRG S&Tech (South Korea)
2018
Daejeon University
2018
Abstract Copper cobaltite (CuCo 2 O 4 ) porous structures with different morphologies are prepared through a hydrothermal method and subsequent annealing process. The tunability of is succeeded by simply regulation solvent medium amount the polyvinylpyrrolidone (PVP) which served as structure directing agent. All samples have mesoporous nature. Specifically, CuCo ‐porous flowers morphology higher surface area (43.2 m g −1 porosity (0.18 cm 3 than other nano such flakes, blades wires. maximum...
Lithium (Li), a leading cathode material in rechargeable Li-ion batteries, is vital to modern energy storage technology, establishing it as one of the most impactful and strategical elements. Given surge electric car market, crucial improve lithium recovery from its rich mineral deposits using effective extraction technique. In recent years, both industry academia have shown significant interest Li various Li-bearing minerals. Of these, only spodumene has established reliable industrial...
Abstract Rare earth elements (REEs) have obtained a greatest significant in human lives owing to their important roles various high technology applications. The present method development was deal REEs such as neodymium, terbium and dysprosium, selective extraction with possible separation recovery studies, successfully. chloride mediated mixed aqueous solution containing 1500 mg/L each of Nd, Tb Dy subjected at Nd from other associated REEs. Three organo-phosphorous based commercial...
Fe 3 O 4 nanoparticles dispersed on single‐walled carbon nanotube (SWCNT) composites are synthesized through a simple in‐situ co‐arc discharge process followed by an annealing process. A well‐integrated /SWCNT composite exhibiting the strong microwave absorption (MA, −36.9 dB at 10.5 GHz) and wide effective bandwidth (5.5 is obtained controlling conditions. The high MA performance of this was ascribed to well integration magnetic (Fe ) SWCNT, creating synergetic effect. This work...
Fuel cell performance largely relies on the activity of catalyst; hence development high electrocatalysts for electrooxidation methanol is highly essential further in fuel technology. Herein, we demonstrate a facile hydrothermal approach growth NiCo2O4 nanorods and their application electrooxidation. The morphology surface area investigation reveal with an average length 500 nm specific 123 m2/g, respectively. displayed larger electrochemical towards alkaline pH than quasi-spherical...
Co@C core–shell nanospheres highly dispersed on carbon supports were rationally designed to improve the microwave absorbing property of composite material, and fabricated by one pot thermal decomposition simple annealing process. The Co completely encapsulated with thin shells, which can effectively prevent oxidation surface. Additionally, particle size properly controlled optimize electromagnetic material. As a result, lightweight Co@C/C composites 20 nm exhibited much enhanced absorption...
Porous magnetite (Fe 3 O 4 ) nanospheres are successfully prepared through a one‐pot solvothermal method with gas‐bubble‐assisted Ostwald ripening process. The formation mechanism is explored by studying the reaction parameters, including concentration of precipitating agent, capping and urea gas source for fixed temperature time. authors’ results show that Fe composed many primary nanocrystals, sizes which well regulated concentration. As such, size spherical nanocrystal determines porosity...
Porous Fe3O4-SnO2 core-void-shell nanocomposites with a porous Fe3O4 core and urchin-like SnO2 shell have been fabricated through the combined processes of modified stobber method hydrothermal deposition technique. These can be maximize interface areas between that consume higher microwave energy, goal improving absorption performance, i.e., achieving strong reflection loss wide effective bandwidth. The surface area pore width distribution confirmed mesoporous morphology nanocomposites....
Controlling impedance matching and enhancing absorption properties are crucial for developing next-generation microwave absorbing materials.
This paper reports the successful additive-free sintering of fine Nd-Fe-B powder prepared by reduction-diffusion (RD) and wet ball milling (WBM) washing. Fine RD poses difficulties in without rare earth (RE) hydride additives due to oxidation or loss Nd-rich phase during washing step. Here, effect different methods such as conventional water washing, acetic acid WBM on oxygen content powders was examined. The involves low energy organic media, which simplifies removal impurities from powder....
We prepared the Nd-Fe-B particles with enhanced magnetic properties through cost-effective and facile chemical methods including spray drying reduction-diffusion (RD) techniques. Since RD process has considerably affected structural of so optimization heat treatments for is in high demand. Different heating rates (5, 10, 20, 30 °C/min) to reach annealing temperature (1000 °C) keeping times were used prepare particles. Among them, sample at 20 °C/min rate (HR) a 5 h time exhibited superior...
Abnormal levels of dopamine (DA) in body fluids is an indication serious health issues, hence development highly sensitive platforms for the precise detection DA essential. Herein, we demonstrate Fe3O4@Cu silicate based electrochemical sensing platform DA. Morphology and BET analysis shows formation ∼320 nm sized sea urchin-like core-shell nanostructures with a 174.5 m2 g-1 surface area. Compared to Fe3O4 Fe3O4@SiO2, urchins delivered enhanced performance towards neutral pH. The sensor has...