A5100387450- Lignin and Wood Chemistry
- Thermochemical Biomass Conversion Processes
- Catalysis for Biomass Conversion
- Fusion materials and technologies
- Biofuel production and bioconversion
- Advanced Cellulose Research Studies
- Nuclear Materials and Properties
- Metal and Thin Film Mechanics
- Phytochemicals and Antioxidant Activities
- Semiconductor materials and devices
- Ferroelectric and Negative Capacitance Devices
- MXene and MAX Phase Materials
- Catalysis and Hydrodesulfurization Studies
- GaN-based semiconductor devices and materials
- Liquid Crystal Research Advancements
- Biochemical and biochemical processes
- Catalytic Processes in Materials Science
- Flame retardant materials and properties
- Dyeing and Modifying Textile Fibers
- Enzyme-mediated dye degradation
- Methane Hydrates and Related Phenomena
- Catalysis and Oxidation Reactions
- Biodiesel Production and Applications
- Material Properties and Processing
- Spacecraft and Cryogenic Technologies
Korea Institute of Science and Technology
2024
Chungnam National University
2022-2023
SK Group (South Korea)
2022-2023
Seoul National University
2007-2023
Gyeongsang National University
2023
Kangwon National University
2020
Government of the Republic of Korea
2017
Korea University
2013-2014
Pohang Iron and Steel (South Korea)
2011-2013
Ehime University
2012
The orientation characteristics of FNLC-919, a new material with ferroelectric nematic phase at room temperature, were investigated. Its alignment varied greatly depending on the relative rubbing direction both substrates liquid crystal cell. In cell where two rubbed in same direction, they arranged homogeneously along without domains or defects phase. anti-parallel twisted opposite direction. We quantitatively obtained and angle by matching experimental data calculation results using Jones...
Abstract Ferroelectric aluminum scandium nitride (Al 0.7 Sc 0.3 N) has attracted increasing interest due to its high remanent polarization ( P r , >100 µC cm −2 ) and coercive field E c >5 MV −1 ). The four radio frequency reactive magnetron sputtering conditions (sputtering power, N 2 flow ratio, pressure, temperature) influence the ferroelectric material properties of 45 nm‐thick Al deposited on TiN/SiO /Si substrate. Crystallinity is enhanced under deposition with higher adatom...
In this study, kraft lignin was used as a polymer for drug-encapsulated nanoparticle synthesis (coumarin 6 and doxorubicin; DOX). Successful drug encapsulation by nanoprecipitation confirmed (max. 59% coumarin max. 73% Compared with the pure nanoparticle, nanoparticles showed no remarkable change in their size (i.d. 176–469 nm) surface charge (−40.5 to −32.7 mV) regardless of particle. The drug-release profiles particles that they follow Fickian diffusion. vitro cytotoxicity assay revealed...
Cellulose microfibrils with an electron diffraction pattern characteristic of crystalline native cellulose I have been assembled abiotically by means a cellulase-catalyzed polymerization beta-cellobiosyl fluoride substrate monomer in acetonitrile/acetate buffer. Substantial purification the Trichoderma viride cellulase enzyme was found to be essential for formation synthetic allomorph. Assembly appears result micellar aggregation partially purified and organic/aqueous solvent system favoring...
Hydrothermal liquefaction (HTL) of lignocellulosic biomass has been widely investigated for the production renewable and alternative bio-crude oil. In this study, catalytic hydrothermal processing two biomasses (larch Mongolian oak) was performed using different K2CO3 concentrations (0, 0.1, 0.5, 1.0 wt% solvent) to improve fuel yield properties. HTL oil, hydrochar, water-soluble fraction (WSF) gas were characterized, carbon balance investigated. As a result, maximum 27.7 (Mongolian 25.7...
As an antioxidant material, lignin has some structural disadvantages such as heterogeneity, high molecular weight, and low functionality. We propose a simple method based on ethanolysis pretreatment (120, 160, 200 °C for 1 h) of by which the structure, especially weight distribution phenolic hydroxyl content (Phe-OH) lignin, are improved. After reaction, over 80 wt % structurally modified (solubilized lignin: SL) was recovered from raw its homogeneity well Phe-OH increased. The activity SLs...
Alkaline soda lignin (AL) was sequentially fractionated into six fractions of different molecular size by means solvent extraction and their phenolic hydroxyl groups were chemoselectively methylated to determine effect on nanoparticle formation polymers. The the structure physical properties nanoparticles also clarified in this study. Nanoparticles obtained from neat alkaline (ALNP), solvent-extracted (FALNPs, i.d. 414–1214 nm), lignins (MALNPs, 516–721 nm) via nanoprecipitation method....
ITO/Ag/ITO (IAI) multilayer-based transparent conductive electrodes for ultraviolet light-emitting diodes are fabricated by reactive sputtering, optimized annealing, and characterized with respect to electrical optical properties. Increasing the annealing temperature from 300°C 500°C decreased sheet resistance increased transmittance. This may result an observed improvement in crystallinity of IAI multilayer a reduction near-UV absorption coefficient Ag. We lowest (9.21 Ω/sq) highest...
Lignin-rich residue was obtained by sequential acid pretreatment (sulfuric, oxalic, and maleic acid; H-ST, H-OT, H-MT) enzymatic hydrolysis (EH). Pretreatment using dicarboxylic (oxalic acid) showed a relatively low solid yield (72.55 69.27%) compared with sulfuric (74.83%). In addition, the of pretreated biomass differed significantly depending on catalyst used. To investigate structural properties lignin-rich residue, milled wood lignin (MWL) extracted. H-MT-EH-MWL H-OT-EH-MWL were found...
Abstract This work systematically studies the TiN, Ru, and RuO 2 top electrodes (TEs) effects on ferroelectric properties of Hf 0.5 Zr O (HZO) films. The Ru electrode significantly improves performance even with conventional TiN bottom electrode. high two‐remanent polarization (2 P r ) value (≈65 µC cm −2 is obtained capacitor TE, which ≈1.5 times higher than that capacitors TEs. Moreover, it does not break down to 1 × 10 9 cycling a electric field 4.0 MV −1 , while others do lower cycle...
The purpose of this study was to investigate the impact lignin structure, especially its average molecular weight (<italic>M</italic><sub>w</sub>) on distribution catalytically depolymerized products.
In recent years, several studies focused on the synthesis of lignin-based nanoparticle in aqueous solution and its potential applications drug carrier were investigated. this study, soda lignin (SL) nanoparticles (i.d. 128–560 nm) synthesized by nanoprecipitation process at three different concentrations (1, 2, 4 mg/mL THF) with various molecular sizes (NP-F1, NP-F2, NP-F3) obtained from sequential solvent extraction. The average weights SL, F1, F2, F3, F4, F5 3130, 1190, 2550, 3680, 5310,...
Abstract Ti layer inserted in the TiN gate electrode effectively scavenges oxygen low‐ k interfacial SiO 2 of metal–ferroelectric–insulator–semiconductor (MFIS) capacitors with ferroelectric Al‐doped HfO (HAO) thin film. The scavenging effect increases remanent polarization (P r ) and reduces coercive voltage (V c capacitance equivalent thickness (CET) HAO films, particularly when MFIS capacitor is annealed at 800 °C. Additionally, frequency dispersion characteristics interface trap density...
Gamma-valerolactone (GVL) was found to be an effective, sustainable alternative in the lignocellulose defragmentation for carbohydrate isolation and, more specifically, lignin dissolution. In this study, it adapted as a green pretreatment reagent milled pinewood biomass. The evaluation performed temperature (140–180 °C) and reaction time (2–4 h) using 80% aqueous GVL obtain highest enzymatic digestibility of 92% yield 33%. Moreover, results revealed positive correlation (R2 = 0.82) between...