A5082658370- Methane Hydrates and Related Phenomena
- Membrane Separation and Gas Transport
- Hydrocarbon exploration and reservoir analysis
- CO2 Sequestration and Geologic Interactions
- Spacecraft and Cryogenic Technologies
- Metal-Organic Frameworks: Synthesis and Applications
- Covalent Organic Framework Applications
- Atmospheric and Environmental Gas Dynamics
- Membrane Separation Technologies
- Carbon Dioxide Capture Technologies
- Inorganic Fluorides and Related Compounds
- Zeolite Catalysis and Synthesis
- MXene and MAX Phase Materials
- Graphene research and applications
- Membrane-based Ion Separation Techniques
- Terahertz technology and applications
- Fuel Cells and Related Materials
- Chemical Synthesis and Characterization
- Advanced battery technologies research
- Acoustic Wave Resonator Technologies
- Hydraulic Fracturing and Reservoir Analysis
- Conducting polymers and applications
- Advanced Battery Materials and Technologies
- Spectroscopy and Laser Applications
- Supercapacitor Materials and Fabrication
Korea Advanced Institute of Science and Technology
2015-2024
Georgia Institute of Technology
2015-2019
Atlanta Technical College
2019
Kootenay Association for Science & Technology
2013
Korea Institute of Geoscience and Mineral Resources
2009-2010
Kongju National University
2010
Korea Institute of Energy Research
2009
Sogang University
2008
Carbon sieving to separate the similar Separating organic molecules, particularly those with almost equal sizes and physical properties, can be challenging may require energy-intensive techniques such as freeze fractionation. Taking inspiration from reverse osmosis of aqueous fluids, Koh et al. describe synthesis, characterization, mass transport performance carbon molecular sieve membranes for separation liquid-phase molecules at room temperature. This technique is capable separating very...
Abstract Very recently, MXene‐based wearable hydrogels have emerged as promising candidates for epidermal sensors due to their tissue‐like softness and unique electrical mechanical properties. However, it remains a challenge achieve with reliable sensing performance prolonged service life, because MXene inevitably oxidizes in water‐containing system of the hydrogels. Herein, catechol‐functionalized poly(vinyl alcohol) (PVA‐CA)‐based is proposed inhibit oxidation MXene, leading rapid...
Understanding the oxidation reaction of aqueous Ti3C2Tx MXene suspensions is very important for fostering fundamental academic studies as well widespread industrial applications. Herein, we investigated mechanism and kinetics at various pH temperature conditions. Through comprehensive analysis, chemical oxidative degradation colloids was established. Chemical produces solid products such TiO2 amorphous carbon gaseous species including CH4, CO, CO2, HF. Additionally, our kinetic study...
Abstract The direct recovery of methane from massive hydrates (MHs), artificial MH‐bearing clays, and natural sediments is demonstrated, using either CO 2 or a /N gas mixture (20 mol % 80 N , reproducing flue power plant) for replacement in complex marine systems. Natural (NGHs) can be converted into hydrate by swapping mechanism. overall process serves dual purpose: it means sustainable energy‐source exploitation greenhouse‐gas sequestration. In particular, scant attention has been paid to...
CO2 absorption is a key to alleviating the environmental consequences of fossil fuel combustion, which major source global emission. Membrane contactors have showcased several competitive advantages in over conventional gas–liquid (e.g., packed towers), such as large mass-transfer area and safe operation owing membranes that physically separate gas liquid phases. This Review discusses state-of-the-art studies related using membrane contactors, with focuses on materials, absorbents, process...
Dynamic interaction between Pd and polyphenylene sulfide enables the design of selective long-lived hydrogenation catalyst.
Abstract Promising advances in membrane technology can lead to energy-saving and eco-friendly solutions industrial sectors. This work demonstrates a highly selective with ultrathin interconnected organosiloxane polymer nanolayers by initiated chemical vapor deposition effectively separate solutes within the molecular weight range of 150–300 g mol −1 . We optimize poly(1,3,5,7-tetravinyl-1,3,5,7-tetramethylcyclotetrasiloxane) adjusting both thickness layer pore sizes its support membranes....
The role of 2D transition metal carbides, also known as MXenes, active catalyst supports in Co-based oxygen evolution reaction (OER) catalysts was elucidated through a combination experimental and computation electrochemistry. Through facile seeding commericial Co nanoparticles on three different MXene (Ti3C2Tx, Mo2Ti2C3Tx, Mo2CTx), Co@MXene were prepared their electrochemical properties examined for alkaline OER electrocatalysts. activity enhancement significantly improved Mo2CTx Mo2Ti2C3Tx...
Organic solvent separations could revolutionize the field of by enabling new low energy, carbon emission technologies. Microporous materials are potential game changers for these challenging due to their ability provide superb size and shape discrimination; however, large-scale application has yet be adopted. This critical perspective will discuss current state art in separation similarly sized organic molecules via microporous membranes key focus areas future research.
Carbon molecular sieve (CMS) membranes are considered game-changers to overcome the challenges that conventional polymeric face. However, CMS also confront a challenge in successfully separating extremely similar-sized molecules. In this article, high-precision tuning of microstructure is proposed by controlled electron irradiation for separation molecules with size differences less than 0.05 nm. Fitting targeted can be accomplished dosage control, resulting highly-efficient C2H4/C2H6 low...
The direct recovery of methane from gas hydrate‐bearing sediments is demonstrated, where a gaseous mixture CO 2 + N used to trigger replacement reaction in complex phase surroundings. A one‐dimensional high‐pressure reactor (8 m) was designed test the actual aspects occurring natural hydrate (NGH) reservoir conditions. NGH can be converted into by “replacement mechanism,” which serves double duty as means both sustainable energy source extraction and greenhouse sequestration. efficiency...
Abstract Current technologies for production of natural gas hydrates (NGH), which include thermal stimulation, depressurization and inhibitor injection, have raised concerns over unintended consequences. The possibility catastrophic slope failure marine ecosystem damage remain serious challenges to safe NGH production. As a potential approach, this paper presents air-driven recovery from permeable sediments induced by simultaneous mechanisms methane liberation (NGH decomposition) CH 4 -air...
As hydrogen molecules enter the clathrate hydrate body, ubiquitous dodecahedral cavity (512) is too small to allow anything but single occupancy thermodynamically. The possibility that H2 double can occur in has been suggested and still under debate. Here we uncover unique feature of multiple molecule a as induced by tuning cage dimensions. guest promoter population matrix spontaneously controls degree molecular storage Our analysis combined with computational study reveals only ∼1%...
Metal–organic frameworks (MOFs) are a class of microporous materials that have been highlighted with fast and selective sorption gas molecules; however, they at least partially unstable in the scale-up process. Here, we report rational shaping MOFs scalable architecture fiber sorbent. The long-standing stability challenge was resolved by using stable metal oxide precursors subject to controlled surface dissolution-growth chemistry during Mg-based MOF synthesis. Highly uniform crystals...
While two-dimensional (2D) Ti3C2Tx MXene in aqueous dispersions spontaneously oxidizes into titanium dioxide (TiO2) nanocrystals, the crystallization mechanism has not been comprehensively understood and resultant crystal structures are controlled among three representative polymorphs: anatase, rutile, brookite. In this study, such control on lattice domain sizes of MXene-derived TiO2 crystallites is demonstrated by means oxidation conditions, pH, temperature (3.0-11.0 20-100 °C,...
Two-dimensional (2D) carbon materials perforated with uniform micropores are considered ideal building blocks to fabricate advanced membranes for molecular separation and energy storage devices high rate capabilities. However, creating high-density in 2D using conventional perforation methods remains a formidable challenge. Here, we report zeolite-templated bottom-up synthesis of ordered microporous carbon. Through rational analysis 255 zeolite structures, find that the IWV having large...
Smectite clays are widely dispersed in deep ocean sediments and can be subdivided into two representative clay types, Cheto- Wyoming-montmorillonites. In this study, we measured the thermodynamic phase behavior of methane hydrates intercalated at various concentrations these found relatively weak promotion tendency when compared to that pure hydrate stability. The structure morphology (IMH) samples were analyzed using MAS NMR, RAMAN, LT-XRD, Cryo-FE-SEM. 27Al 29Si solid-state NMR spectra IMH...
Promising advances in adsorption technology can lead to energy-efficient solutions industrial sectors. This work presents precise molecular sieving of xylene isomers the polymer-metal-oragnic framework (polyMOF), a hybrid porous material derived from parent isoreticular MOF-1 (IRMOF-1). PolyMOFs are synthesized by polymeric ligands bridged evenly spaced alkyl chains, showing reduced pore sizes and enhanced stabilities compared its due tethered polymer bridge within pores while maintaining...