A5088910850- Glass properties and applications
- Advancements in Battery Materials
- Advanced ceramic materials synthesis
- Luminescence Properties of Advanced Materials
- Microwave Dielectric Ceramics Synthesis
- Advanced Battery Materials and Technologies
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Advanced Battery Technologies Research
- Ferroelectric and Piezoelectric Materials
- Quantum Chromodynamics and Particle Interactions
- Recycling and utilization of industrial and municipal waste in materials production
- Organic Light-Emitting Diodes Research
- Conducting polymers and applications
- Thin-Film Transistor Technologies
- Synthesis and properties of polymers
- Semiconductor materials and interfaces
- Transition Metal Oxide Nanomaterials
- Supercapacitor Materials and Fabrication
- Surface Roughness and Optical Measurements
- Semiconductor materials and devices
- Material Properties and Applications
- Silicone and Siloxane Chemistry
- Silicon and Solar Cell Technologies
- Sustainable Industrial Ecology
Kongju National University
2009-2025
Inha University
2014-2023
Sejong University
2019-2023
Korea Institute of Toxicology
2023
Korea Institute of Geoscience and Mineral Resources
2023
Seoul National University
2019
National University of Science and Technology
2019
Council of Science Editors
2018
Sunchon National University
1995-2016
Korea Institute of Science and Technology
2007-2016
Since one of the main drawbacks Li4Ti5O12 as a negative-electrode material is its low electronic conductivity, several researchers have attempted to improve conductivity by narrowing band gap through transition-metal doping. Herein, we report another, more significant effect doping in addition narrowing, namely, an anomalous decrease structural disorder upon Cr3+-ion Although it generally recognized that with heterogeneous elements increases disorder, demonstrated unexpected phenomenon. From...
A green process route is proposed to recycle LiFePO<sub>4</sub> cathode materials from FePO<sub>4</sub>·2H<sub>2</sub>O metastrengite I intermediate phase.
The discrete wavelet transform (DWT) has several advantages of multiresolution analysis and subband decomposition, which been successfully used in image processing. However, the shift-variant property is intrinsic due to decimation process transform, it makes wavelet-domain motion estimation compensation inefficient. To overcome property, a low-band-shift method proposed presented. superior performance conventional methods terms mean absolute difference (MAD) as well subjective quality. can...
Abstract A series of dimethyl‐substituted tris(pyridylphenyl)iridium( III ) derivatives [( n ‐MePy− n′ ‐MePh) 3 Ir] [ = 3, 4 ( 1 ); 4, 2 5 5, )] have been synthesized and characterized to investigate the effect substitution methyl groups on solid‐state structure photo‐ electroluminescence. The absorption, emission, cyclic voltammetry electroluminescent performance − also systematically evaluated. structures determined by a single‐crystal X‐ray diffraction analysis. Under reflux (> 200 °C)...
Li4Ti5O12 (LTO) is recognized as being one of the most promising anode materials for high power Li ion batteries; however, its insulating nature a major drawback. In recent years, simple thermal treatment carried out in reducing atmosphere has been shown to generate oxygen vacancies (VO) increasing electronic conductivity this material. Such structural defects, lead re-oxidization over time, causing serious deterioration performance. Herein, we report unique approach with simultaneous...
Herein, we report a cheap and simple approach to solve the polysulfide dissolution problem in lithium sulfur batteries. It was interestingly revealed that insertion of acetylene black mesh enabled us obtain capacity 1491 mA h g−1 at initial discharge 1062 after 50 cycles.
The novel spirobifluorene diamine monomer, 2,7-bis-amino-2',7'-di-tert-butyl-9,9'-spirobifluorene, was obtained. new organosoluble polyimides were prepared from containing bulky tert-butyl group and conventional dianhydrides as well 2,2'-bis(4' '-tert-butylphenyl)-4,4',5,5'-biphenyltetracarboxylic dianhydride (BBBPAn) '-trimethylsilylphenyl)-4,4',5,5'-biphenyltetracarboxylic (BTSBPAn), which are composed of a noncoplanar twisted biphenyl unit p-tert-butylphenyl groups and/or...
Abstract A new series of highly efficient red‐emitting phosphorescent Ir(III) complexes, (Et‐CVz‐PhQ) 2 Ir(pic‐N‐O), Ir(pic), Ir(acac), (EO‐CVz‐PhQ) and based on carbazole (CVz)‐phenylquinoline (PhQ) main ligands picolinic acid N‐oxide (pic‐N‐O), (pic), acetylacetone (acac) ancillary ligands, are synthesized for organic light‐emitting diodes (PhOLEDs), their photophysical, electrochemical, electroluminescent (EL) properties investigated. All the complexes have high thermal stability emit an...
In this letter we show that it is possible to drastically change electric double layer capacitance, from a large increase complete disappearance, by introducing various surface functional groups on carbon nanotubes. The introduction of carboxyl created 3.2 times larger capacitance due the increased hydrophilicity multiwalled nanotubes in an aqueous electrolyte. contrast, alkyl resulted marked decrease capacitance. Notably, unexpectedly observed disappearance for samples functionalized with...
Pores formed during the sintering of a glass/phosphor mixture affect scattering and path light within resulting phosphor-in-glass (PIG) plate. An investigation interactions between blue from an LED chip pores PIG plate is therefore needed to understand effect on optical properties. To this end, various glass compositions based SiO2-B2O3-ZnO were prepared so as better modifiers (i.e., Li2O, Na2O, La2O3, WO3) viscosity pore properties at different temperatures. This study found that PIGs...
The transmittance of phosphor-in-glass (PIG) color converter material was studied as a factor affecting the luminescence properties light emitting diode packaging; it is closely related to residual pores sintered glass. In this study, correlation between porosity and optical glass PIG plates investigated. transmittance, properties, were measured by UV-visible spectrometer, integrating sphere scanning electron microscope, respectively. Transmittance plate luminous efficacy both increase with...
1. Transmural transport of 22Na+, 51Cr‐EDTA, [3H]inulin and [14C]Dextran (57 kDa) was measured in perfused rabbit atria. The radiolabelled extracellular space (ECS) markers were introduced into the pericardial or atrial lumen. Atrial volume changes induced by steps up down pressure. 2. Basal rates transmural ECS across wall relatively stable to 70 min. stretch release resulted a rapid but transient, reversible increase fluid (ECF) translocation. increased translocation ECF lumen occurred...
The two new dianhydrides, 2,2'-bis(4' '-tert-butylphenyl)-4,4',5,5'-biphenyltetracarboxylic dianhydride (BBBPAn) and '-trimethylsilylphenyl)-4,4',5,5'-biphenyltetracarboxylic (BTSBPAn), composed of a noncoplanar twisted biphenyl unit containing tert-butylphenyl or trimethylsilylphenyl groups were prepared. Two series organosoluble polyimides prepared from the aromatic diamines by conventional polyamide acid reaction followed chemical imidization as well high-temperature one-step...
This paper describes an environmentally friendly process for the recovery of <TEX>$LiFePO_4$</TEX> cathode materials from scrap electrodes by a simple thermal treatment method. The active were easily separated aluminum substrate foil and polymeric binders also decomposed at different temperatures (<TEX>$400^{\circ}C$</TEX>, <TEX>$500^{\circ}C$</TEX>, <TEX>$600^{\circ}C$</TEX>) 30 min under nitrogen gas flow. samples characterized X-ray diffraction (XRD), scanning electronic microscopy (SEM),...
The electrochemical properties of lithium-sulfur batteries with binary electrolytes based on DME and DOL, TEGDME DOL mixed solvent containing <TEX>$LiClO_4$</TEX>, LiTFSI, LiTF salts were investigated. ionic conductivity 1M LiTFSI <TEX>$LiClO_4$</TEX> increased as the volume ratio increased, because effectively reduces viscosity above medium under same concentration. first discharge capacity in DOL-based electrolyte followed this order: (1,000 mAh/g) > (850 (750 mAh/g). In case (1,030 (770...