A5100609778- Physics of Superconductivity and Magnetism
- Superconductivity in MgB2 and Alloys
- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Iron-based superconductors research
- Advanced Battery Technologies Research
- Supercapacitor Materials and Fabrication
- Advanced battery technologies research
- Perovskite Materials and Applications
- Extraction and Separation Processes
- Thermal Expansion and Ionic Conductivity
- Healthcare and Venom Research
- Quantum Dots Synthesis And Properties
- Superconducting Materials and Applications
- ZnO doping and properties
- Chalcogenide Semiconductor Thin Films
- Fire dynamics and safety research
- Semiconductor materials and devices
- Organic and Molecular Conductors Research
- Rare-earth and actinide compounds
- Head and Neck Cancer Studies
- Superconducting and THz Device Technology
- Fire effects on concrete materials
- Conducting polymers and applications
- Evacuation and Crowd Dynamics
Gwangju Institute of Science and Technology
2018-2024
Seoul National University
2009-2024
Yonsei University
2022-2024
Gachon University
2023
Samsung (South Korea)
2022
Kongju National University
2009-2021
Gwangju University
2020
Government of the Republic of Korea
2020
Chosun University
2019
Kyung Hee University
2018
We report the growth of high-quality c-axis-oriented epitaxial MgB2 thin films by using a pulsed laser deposition technique. The grown on (1`1 0 2) Al2O3 substrates show Tc 39 K. critical current density in zero field is ~ 6 x 10^6 A/cm2 at 5 K and 3 10^5 A/cm^2 35 K, suggesting that this compound has great potential for electronic device applications, such as microwave devices superconducting quantum interference devices. For deposited Al2O3, X-ray diffraction patterns indicate highly...
The study of the anisotropic superconductor MgB2 using a combination scanning tunneling microscopy and spectroscopy reveals two distinct energy gaps at Delta(1)=2.3 meV Delta(2)=7.1 4.2 K. Different spectral weights partial superconducting density states are reflection different directions in this multiband system. Temperature evolution spectra follows BCS scenario [Phys. Rev. Lett. 3, 552 (1959)]] with both vanishing bulk T(c). data confirm importance Fermi-surface sheet dependent...
In high-quality c-axis-oriented MgB2 thin films, we observed high critical current densities ( J(c)) of approximately 16 MA/cm(2) at 15 K under self-fields comparable to those cuprate high-temperature superconductors. The extrapolated value J(c) 5 was estimated be 40 MA/cm(2). For a magnetic field T, 0.1 detected K, suggesting that this compound would very promising candidate for practical applications temperature and lower power consumption. vortex-glass phase is considered possible...
The purpose of this study was to determine the effects baicalein and wogonin, which are compounds derived from Chinese herb Scutellaria baicalensis, in suppressing viability HT-29 human colon cancer cells. Following treatment with or several apoptotic events were observed, including DNA fragmentation, chromatin condensation increased cell cycle arrest G1 phase. Baicalein wogonin decreased Bcl-2 expression, whereas expression Bax a dose-dependent manner compared control. Furthermore,...
By employing Li2NiO2 exhibiting the distinctively low coulombic efficiency at first cycle as a cathode additive, lithium-ion batteries can be tuned to exhibit cathode-limiting configuration that is inherently immune overdischarge abuse.
Silymarin is a purified mixture of four isomeric flavonoids extracted from the seeds and fruit milk thistle plant, <em>Silybum marianus</em> (L.). exhibits wide variety biological effects commonly used in traditional medicine. Therefore, anticancer silymarin on human breast cancer cells were investigated to determine its pharmacological mechanisms <em>in vitro</em> vivo</em>. The viability proliferation MDA‑MB‑ 231 MCF‑7 using MTT wound healing assays. decreased MDA‑MB‑231...
The longitudinal resistivity (ρxx) and Hall coefficient (RH) were measured for MgB2 sintered under high pressure. We found that RH is positive like cuprate high-Tc superconductors, decreases as the temperature increases 40 K &lt;T&lt;300 K. cotangent of angle was to follow a+bT2 behavior from Tc 300 At T=100 K, RH=4.1×10−11 m3/C which hole carrier density determined be 1.5×1023/cm3. This 1–2 orders magnitude larger than those Nb3Sn optimally doped YBa2Cu3Oy superconductors.
Measurements of magnetotransport and current-voltage (I-V) characteristics up to 9 T were used investigate the vortex phase diagram an under-doped (Ba,K)Fe2As2 single crystal with Tc=26.2 K. It is found that anisotropy ratio upper critical field Hc2 decreases from 4 2.8 decreasing temperature Tc 24.8 Consistent vortex-glass theory, I-V curves measured at H=9 can be well scaled transition Tg=20.7 K exponents z=4.1 v=1. Analyses in different magnetic fields produced almost identical exponent...
Temperature dependent optical conductivities and dc resistivity of c-axis oriented superconducting (T(c) = 39.6 K) MgB2 films (approximately 450 nm) have been measured. The normal state ab-plane can be described by the Drude model with a temperature independent plasma frequency omega(p,D) 13 600+/-100 cm(-1) or 1.68+/-0.01 eV. is fitted Bloch-Grüneisen formula an electron-phonon coupling constant lambda(tr) 0.13+/-0.02. conductivity spectra below T(c) these suggest that multigap superconductor.
For the development of high-performance lithium-ion batteries (LIBs), numerous studies on 3-dimensionalized electrode structures have been conducted to improve ionic diffusion, rate performance, and electrolyte wetting ability. Due decrease in polarization, structured electrodes show much higher capacity retention compared typical electrodes, especially at high current rates. In this study, pore-structured graphite (Gr) were synthesized using pore-formation agent particles...