A5071300800- Advanced NMR Techniques and Applications
- Atomic and Subatomic Physics Research
- Lignin and Wood Chemistry
- Pesticide Exposure and Toxicity
- Electron Spin Resonance Studies
- Solid-state spectroscopy and crystallography
- Metal-Organic Frameworks: Synthesis and Applications
- High-pressure geophysics and materials
- Radioactive element chemistry and processing
- Diamond and Carbon-based Materials Research
- Alzheimer's disease research and treatments
- Computational Drug Discovery Methods
- Catalytic Processes in Materials Science
- Advanced Photocatalysis Techniques
- Chemical Synthesis and Reactions
- Catalysis for Biomass Conversion
- Machine Learning in Materials Science
- Biofuel production and bioconversion
- Energetic Materials and Combustion
- Advanced MRI Techniques and Applications
- Carbon dioxide utilization in catalysis
- Chemical Thermodynamics and Molecular Structure
- Free Radicals and Antioxidants
- Advanced oxidation water treatment
- Catalysis and Oxidation Reactions
Korea Military Academy
2011-2025
Colorado State University
2022-2024
Government of the Republic of Korea
2019-2023
Seoul Institute
2019-2021
University of California, Berkeley
2015-2019
Lawrence Berkeley National Laboratory
2015-2019
Berkeley College
2016
University of California System
2016
Seoul National University
2007-2008
Textron (United States)
1986
Conversion of the greenhouse gas carbon dioxide (CO2) to value-added products is an important challenge for sustainable energy research, and nanomaterials offer a broad class heterogeneous catalysts such transformations. Here we report molecular surface functionalization approach tuning gold nanoparticle (Au NP) electrocatalysts reduction CO2 CO. The N-heterocyclic (NHC) carbene-functionalized Au NP catalyst exhibits improved faradaic efficiency (FE = 83%) CO in water at neutral pH...
Deep eutectic solvents (DESs) are effective for biomass conversion and have been proposed as alternatives to ionic liquids (ILs). Herein, we first report an pretreatment of woody using a novel hardwood lignin-based DES prepared from p-hydroxybenzoic acid (PB) choline chloride (ChCl), which used the hydrogen bond donor acceptor, respectively. The impacts ChCl-PB on structural properties enzymatic hydrolysis poplar wood were comprehensively evaluated. performance was also compared with two...
Abstract Low detection sensitivity stemming from the weak polarization of nuclear spins is a primary limitation magnetic resonance spectroscopy and imaging. Methods have been developed to enhance spin but they typically require high fields, cryogenic temperatures or sample transfer between magnets. Here we report bulk, room-temperature hyperpolarization 13 C observed via high-field resonance. The technique harnesses optically induced diamond nitrogen vacancy centres at room temperature in...
The efficient removal of radioactive iodine (I2) has drawn worldwide attention because the severe effects radiotoxicity on environment and human health. As a result, porous materials for capture safe storage are required. In this work, nanoscale zeolitic imidazolate framework-8 (ZIF-8) its amino-functionalized ZIF-8 derivatives with 3-amino-1,2,4-triazole (Atz), denoted as ZIF8-A, were prepared via postsynthetic modification, their performance I2 from n-hexane was investigated. abundant...
Significance Deep eutectic solvents (DESs) have gained increasing attention due to their application-friendly properties, including universal solvating capabilities and wide tunability. Additionally, ease of synthesis broad availability from inexpensive chemical components could render DESs more versatile for biomass pretreatment, as compared with traditional ionic liquids. Because the long-term success biorefinery depends on development sustainable processes convert lignocellulosics into...
Size-controlled hybrid ZIFs (core-shell ZIF-67@ZIF-8, ZIF-8@ZIF-67, and bimetallic Zn/Co-ZIF-8) with the same particle size were synthesized by a seed-mediated methodology adjusting of core ZIFs. The was tested as heterogeneous catalysts for CO2 cycloaddition to epoxides using pure gas mixed (85 % CO2/15% N2) without any co-catalyst solvent. effect composition shell on catalytic performance reaction investigated. Furthermore, correlation between structural defects activity in ZIF along their...
Clearing the mind: Peptide-cleaving agents for amyloid β-42 (Aβ42) oligomers (see scheme), intermediate neurotoxic species in pathology of Alzheimer's disease, have been obtained from a combinatorial library built using CoIII complex 1,4,7,10-tetraazacyclododecane as reaction center. Effective cleavage Aβ42 occurs at submicromolar concentrations agents. Supporting information this article is available on WWW under http://www.wiley-vch.de/contents/jc_2002/2007/z702399_s.pdf or author. Please...
<sup>129</sup>Xe–cucurbit[6]uril NMR signals were blocked <italic>via</italic> rotaxanes until chemically activated. This platform is customizable for a broad range of applications.
The catalytic effect of Na and Mg, naturally occurring alkali alkaline earth metals, on lignin pyrolysis was systematically analyzed using a distributed activation energy model computational modeling.
Catalytic pyrolysis is a promising technology for the production of renewable fuels and chemicals from lignin. The yield aromatic compounds catalytic lignin significantly affected by naturally existing alkali alkaline earth metals (AAEMs). Through extensive density functional theory study, we investigated, at molecular level, influence AAEMs on bond breaking mechanism representative model compounds. According to calculation results, were found strongly bind with O(Cβ) O(methoxy), activities...
Microwave irradiation assists the transformation of acid-insoluble Klason lignin into a green adhesive at low reaction temperature (100 °C) and short time (10 min).
ABSTRACT Accurate prediction of vapor pressure is essential in chemical engineering, environmental science, and pharmaceutical development, impacting the volatility stability compounds. Traditional methods often fall short for complex new molecular structures. This study introduces an advanced machine learning approach, integrating graph neural networks (GNNs), CHEM‐BERT models to improve accuracy. Utilizing largest dataset date, we derived comprehensive descriptors fingerprints. We...
Nuclear magnetic resonance (NMR) and imaging (MRI) are powerful analytical tools with diverse applications in research medicine. However, the inherently poor signal-to-noise ratios induce technical limitations, which suppress their widespread use. Hyperpolarization enhances NMR signals by inducing highly nonequilibrated population distributions among nuclear spin states. We demonstrated real-time amino acid hyperpolarization using signal amplification reversible exchange (SABRE). aimed to...
Increases in synthetic drug production and distribution pose significant risks to public health safety. Traditional detection methods often fail accurately identify these complex chemicals, particularly when they are mixed. Accordingly, Herein, an advanced density functional theory spectroscopy integrated identification method (D‐SIIM) comprising a combination of experimental theoretical analyses is introduced. D‐SIIM helpful correcting the erroneous information provided by gas...
Optically polarizable nitrogen-vacancy (NV) centers in diamond enable hyperpolarization of 13C nuclear spins at a low magnetic field and room temperature. However, it remains challenge to achieve high level polarization, comparable that conventional dynamic polarization. In this paper, we demonstrate polarization 5%, equivalent an enhancement ratio over $$7 \times 10^6$$ , can be attained less than 10 mT. We used high-purity with initial nitrogen concentration below 1 ppm, which resulted...
We report on the design and implementation of a cucurbit[6]uril rotaxane probe for detection matrix metalloproteases by Xe hyperCEST NMR.
The identities and properties of 'Novichok' (Russian for 'newcomer' or 'novice') agents allegedly used in the recent terrorist attack UK have not been well documented. Although several people previously involved synthesis these materials claimed Novichok to be five eight times more potent than VX, a deadly nerve agent, no open data on species are currently available. To bridge this gap, we herein performed theoretical study agent candidates conducted natural population charge analysis...