Publications by authors named "J Gwak"
Catalyst design plays a critical role in ensuring sustainable and effective energy conversion. Electrocatalytic materials need to be able to control active sites and introduce defects in both acidic and alkaline electrolytes. Furthermore, producing efficient catalysts with a distinct surface structure advances our comprehension of the mechanism.
View Article and Find Full Text PDFThis study focused on analyzing the spatial and vertical distributions of 28 per- and polyfluoroalkyl substances (PFASs), which comprised five precursors and three alternatives, in the water columns of the regional seas surrounding South Korea, such as the Yellow Sea (YS, Y1-Y10), East China Sea (ECS, EC1-EC6), South Sea (SS, S1-S5), and East Sea (ES, E1-E7). The concentrations of these PFASs detected in 204 seawater samples varied from below the limit of detection (
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- Plasmonic metasurfaces (PMs) are highlighted for their exceptional optical properties that are beneficial for advanced photovoltaic devices, with a focus on a new PM heterojunction involving a nanopore confinement effect in metal-organic frameworks (MOFs) combined with gold nanoparticles (AuNPs).
- The unique porous structure of 2D MOFs allows for precise control over the synthesis of AuNPs, which optimizes the interface for enhanced localized surface plasmon resonance (LSPR) and photovoltaic responsiveness through work function alignment and Schottky barrier formation.
- The study introduces a PMs-enhanced biosensor utilizing multifunctional peptides and MOF@UsAu for ultrasensitive direct analysis of tumor exosomes, marking a pioneering approach in
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- This study focused on identifying major aryl hydrocarbon receptor (AhR) agonists found in surface sediments from Kongsfjorden, Arctic Svalbard, particularly near abandoned coal mines.
- High levels of AhR activity were detected, especially in sediments from sites S2 and S3, with significant amounts of various polycyclic aromatic hydrocarbons (PAHs) present.
- Findings revealed that around 24 specific AhR agonists contributed significantly to the observed toxic potential, with many being identified as coal-derived substances, emphasizing the need for more research on the ecological impacts of these contaminants.
Soil microorganisms often thrive as microcolonies or biofilms within pores of soil aggregates exposed to the soil atmosphere. However, previous studies on the physiology of soil ammonia-oxidizing microorganisms (AOMs), which play a critical role in the nitrogen cycle, were primarily conducted using freely suspended AOM cells (planktonic cells) in liquid media. In this study, we examined the growth of two representative soil ammonia-oxidizing archaea (AOA), EN76 and "" MY2, and a soil ammonia-oxidizing bacterium, ATCC 19718 on polycarbonate membrane filters floated on liquid media to observe their adaptation to air-exposed solid surfaces.
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