A5008224918- Metal-Organic Frameworks: Synthesis and Applications
- Carbon Dioxide Capture Technologies
- Covalent Organic Framework Applications
- Ionic liquids properties and applications
- Membrane Separation and Gas Transport
- Supramolecular Chemistry and Complexes
- Phase Equilibria and Thermodynamics
- Crystallography and molecular interactions
- Microplastics and Plastic Pollution
- Advancements in Battery Materials
- Recycling and Waste Management Techniques
- Carbon dioxide utilization in catalysis
- Membrane-based Ion Separation Techniques
- Dendrimers and Hyperbranched Polymers
- Mineral Processing and Grinding
- Microbial Metabolic Engineering and Bioproduction
- Lubricants and Their Additives
- Nanopore and Nanochannel Transport Studies
- Advanced Polymer Synthesis and Characterization
- Molecular Sensors and Ion Detection
- Advanced Battery Materials and Technologies
- Polymer crystallization and properties
- Pickering emulsions and particle stabilization
- Membrane Separation Technologies
- Sustainable Supply Chain Management
Oak Ridge National Laboratory
2024-2025
Georgia Institute of Technology
2020-2023
University of Saskatchewan
2017
Indian Institute of Technology Roorkee
2017
The rapidly increasing atmospheric CO2 concentration has driven research into the development of cost- and energy-efficient materials processes for direct air capture (DAC). Solid-supported amine can give high uptakes acceptable sorption kinetics, but they are generally prepared in powder forms that likely not practically deployable large-scale operations due to significant pressure drops associated with packed-bed gas–solid contactors. To this end, effective contactors technologies is...
Efficient chemical recycling of consumer plastics (i.e., depolymerization down to monomers) is a crucial step needed achieve circular material economy. In this work, poly(ethylene terephthalate) (PET) via mechanochemical hydrolysis with sodium hydroxide studied, complete achieved in 20 min. The stages are investigated by monitoring monomer yields and the change PET molecular weight over course reaction. initially increase linearly milling time, up yield roughly 40%. However, weights residual...
Microporous metal-organic frameworks (MOFs) have been widely studied for molecular separation and catalysis. The uniform micropores of MOFs (<2 nm) can introduce diffusion limitations render the interiors crystal inaccessible to target molecules. introduction hierarchical porosity (interconnected micro mesopores) enhance intra-crystalline while maintaining separation/catalytic selectivity. Conventional MOF synthesis involves complex strategies such as elongated linkers, soft templating,...
Precise sub‐Ångstrom‐level porosity engineering, which is appealing in gas separations, has been demonstrated solid carbon, polymer, and framework materials but rarely achieved the liquid phase. In this work, a molecular sieving effect phase at sub‐5 Ångstrom scale created via sophisticated tuning calixarene‐derived porous liquids (PLs). Type II PLs are constructed supramolecular complexation between sodium salts of calixarene derivatives crown ether solvents. The chemical structure...
Precise sub-Ångstrom-level porosity engineering, which is appealing in gas separations, has been demonstrated solid carbon, polymer, and framework materials but rarely achieved the liquid phase. In this work, a molecular sieving effect phase at sub-5 Ångstrom scale created via sophisticated tuning calixarene-derived porous liquids (PLs). Type II PLs are constructed supramolecular complexation between sodium salts of calixarene derivatives crown ether solvents. The chemical structure...
Porous liquids have traditionally been designed with sterically hindered solvents. Alternatively, recent efforts rely on dispersing microporous frameworks in simpler solvents like water. Here we report a unique strategy to construct macroporous water by selectively incorporating hydrophilicity the surfaces of hydrophobic hollow carbon spheres (HCS). Specifically, show that stable dispersion surface ionized HCS while retaining inherent porosity. The electrocatalytic conversion small gas...
Abstract A supramolecular complexation approach is developed to improve the CO 2 chemisorption performance of solvent‐lean amine sorbents. Operando spectroscopy techniques reveal formation carbamic acid in presence a crown ether. The reaction pathway confirmed by theoretical simulation, which ether acts as proton acceptor and shuttle drive stabilization acid. Improved capacity diminished energy consumption sorbent regeneration are achieved.
The efficient separation of the 2,3-butanediol (2,3-BDO) intermediate from fermentation broth is an important issue in production biofuels biomass-derived intermediates. Two zeolitic imidazolate frameworks ZIF-8 and ZIF-71 were investigated for adsorption via liquid breakthrough measurements. While both ZIF materials initially show high performance, retains robust performance even after aging ethanol two years, whereas capacity decreases significantly. robustness stability are further...
Exposure of the metal–organic zeolitic imidazolate framework-8 (ZIF-8) to humid SOx gas cleaves Zn–N bonds, leading framework disorder and a corresponding decrease in pore accessibility. This work shows that exhibits critical behavior with respect water concentration stream. While quantity sulfate adsorbed at Zn nodes is or below detection threshold for X-ray pair distribution function technique, precluding direct observation adsorbate, powder diffraction reveals clear structural...
Polyamide (PA)-based nanofiltration membranes fabricated via interfacial polymerization (IP) are widely studied for water desalination. The formation of hybrid (nanocomposite) comprising PA along with nanoporous materials has the potential to increase flux while maintaining salt rejections low energy input. We report a new type nanocomposite membrane high-aspect-ratio AEL molecular sieve nanosheet coating and PA, on α-alumina hollow fibers. find that acts as semipermeable reservoir store...
The tuning of micropore environments in zeolitic imidazolate frameworks (ZIFs) by mixed-linker synthesis has the potential for enabling new molecular separation properties. However, de novo (hybrid) ZIFs is often challenging due to disparate chemical properties different linkers. Here, we elucidate structure and an unconventional ZIF-8-7 hybrid material synthesized via a controlled-acid-gas-assisted degradation reconstruction (solvent-assisted crystal redemption, SACRed) strategy. Selective...
Abstract Porous liquids (PLs) represent a new frontier in material design combining the merits of solid porous host and liquid phase gas separation catalysis. Herein, PL construction approach is harnessed to tailor gating effect organic cages toward enhanced separation. A type‐II fluorinated (F‐PL) developed via liquifying cage (F‐cage) by ionic (F‐IL). The F‐cage featured small window size (≈5.1 Å), high surface area, good stability under highly conditions, abundant fluorine moieties. F‐IL...
This work investigates the X-ray scattering signatures of disorder in zeolitic imidazolate framework ZIF-8. Two layer models are examined reciprocal space and compared with conventional Rietveld analysis. Stacking faults along [001] direction cubic lattice poor agreement experimental powder diffraction data, consistent previously reported density functional theory studies showing that these defects energetically unfavorable amorphization. Meanwhile, fluctuation position [110] shows a...
The metal-linker coordination bond in metal–organic frameworks (MOFs) can be unstable humid and acid gas environments, leading to loss of crystallinity porosity. This degradation is not necessarily irreversible; solvent-assisted crystal redemption ("SACRed") has been shown recover the physical chemical properties ZIF-8 exposed SO2. approach also useful creating mixed-linker materials that might challenging produce via de novo synthesis. Here, we expand more generally concept controlled a MOF...
Porous liquids and fluids with permanent porosity have been explored over the past decade as transformative functional materials for several sustainable chemical processes. This perspective tracks evolution of porous summarizes recent advances in development applications, such sorptive separations, catalysis, etc. The latter section discusses prospects novel applications (bio gas storage, heat insulation) machine learning guided pathways task-specific design synthesis liquids.
The CO2 chemisorption in state-of-the-art sorbents based on oxide/hydroxide/amine moieties is driven by strong chemical bonding formation the carbonate/bicarbonate/carbamate products, which turn leads to high energy input sorbent regeneration. In addition, uptake capacity was limited active sites' utilization efficiency, with each site incorporating one molecule or less. this work, a new concept and generation of developed achieve cascade insertion multiple molecules leveraging structure...
The lack of a standard anode for sodium-ion batteries (SIBs) has greatly hindered their applications. Herein, we show that novel phase carbon, namely Q-carbon, is an effective material batteries. which metastable carbon consisting about 80% sp3- and 20% sp2-bonded synthesized by nonequilibrium pulsed laser annealing arc-discharge methods. Two types Q-carbons, Q1 Q2, were evaluated as SIBs. had slow quench was used the control, whereas Q2 Q-carbon with rapid quenching. exhibits high initial...