A5032628026- Carbon Dioxide Capture Technologies
- Radioactive element chemistry and processing
- Minerals Flotation and Separation Techniques
- Membrane-based Ion Separation Techniques
- Electrohydrodynamics and Fluid Dynamics
- Membrane Separation Technologies
- Electrostatics and Colloid Interactions
- Chemical Synthesis and Characterization
- Fluid Dynamics and Mixing
- CO2 Sequestration and Geologic Interactions
- Methane Hydrates and Related Phenomena
- Radioactive contamination and transfer
- Membrane Separation and Gas Transport
- Fuel Cells and Related Materials
- Extraction and Separation Processes
- Innovative Microfluidic and Catalytic Techniques Innovation
- Phase Equilibria and Thermodynamics
- Atmospheric and Environmental Gas Dynamics
- Coagulation and Flocculation Studies
- Force Microscopy Techniques and Applications
- Electrochemical Analysis and Applications
- Process Optimization and Integration
- Covalent Organic Framework Applications
- Supercapacitor Materials and Fabrication
- Radioactivity and Radon Measurements
Oak Ridge National Laboratory
2015-2024
Georgia Institute of Technology
2015-2024
Government of the United States of America
2022-2024
National Technical Information Service
2011-2024
Office of Scientific and Technical Information
2011-2024
National Transportation Research Center
2013-2020
Oak Ridge Associated Universities
2014
NOAA Chemical Sciences Laboratory
2011
University of Tennessee at Knoxville
2009-2010
Materials Research Group (United States)
2002-2010
Abstract A substantial effort has been made by numerous investigators to describe droplet breakage and coalescence in turbulent dispersions. An attempt is here improve these models based on existing frameworks recent advances described the literature. Two‐step mechanisms are considered for both models. The drop function structured as product of drop‐eddy collision frequency efficiency which reflect energetics liquid‐liquid retains former structure drop‐drop efficiency. model modified account...
Self-assembled mesoporous carbon (MC) materials have been synthesized and tested for application in capacitive deionization (CDI) of saline water. MC was prepared by self-assembly a triblock copolymer with hydrogen-bonded chains via phenolic resin, such as resorcinol or phloroglucinol acidic conditions, followed carbonization and, some cases, activation KOH. Carbon this way ground into powder, from which activated sheets were produced. In variation process, after the reaction phloroglucinol,...
From the sea to reactor: Nanoporous template-free initiators for atom-transfer radical polymerization (ATRP) were synthesized with surface and framework initiator sites tailorable pore structures. Polyacrylonitrile grown on one was converted into polyamidoxime generate a uranium sorbent seawater extraction high uptake rate capacity relative those of nonwoven irradiation-grafted polyethylene-fiber composites. As service our authors readers, this journal provides supporting information...
Uranium recovery from seawater has been investigated for several decades the purpose of securing nuclear fuel energy production. In this study, field column experiments have performed at Marine Sciences Laboratory Pacific Northwest National (PNNL) using a laboratory-proven, amidoxime-based polymeric adsorbent developed Oak Ridge (ORNL). The was packed either in in-line filters or flow-through columns. maximum amount uranium uptake 3.3 mg U/g after 8 weeks contact between and seawater. This...
An electrical double-layer model is developed to predict electrosorption of ions from aqueous solutions by carbon aerogel electrodes. The electrodes are treated as capacitors, and modeled using classical theory. Because the porous characteristics electrodes, total capacity system obtained summing contributions individual pores. pore size distribution measured physical adsorption N2 CO2 well mercury intrusion porosimetry. When a has width smaller than specific value (cutoff width), it does...
Templated carbon materials have recently received tremendous attention due to energy storage and separations applications. Hierarchical structures are ideal for increased mass-transport throughout the material. A new ordered mesoporous material has been developed using glyoxal which exhibits a hierarchical structure with pore sizes up 200 nm. The arises from cross linking reagent not standard spinodal decomposition of secondary solvent. was studied potential application as capacitive...
Fiber adsorbents synthesized<italic>via</italic>ATRP.
Changes in the anode, cathode, and solution/membrane impedances during enrichment of an anode microbial consortium were measured using electrochemical impedance spectroscopy. The was enriched a compact, flow-through porous electrode chamber coupled to air-cathode. initially decreased from 296.1 36.3 Ω first 43 days indicating exoelectrogenic biofilm formation. external load on MFC stepwise manner allow further enrichment. operation at final 50 1.4 Ω, with corresponding cathode...
The need to secure future supplies of energy attracts researchers in several countries a vast resource nuclear fuel: uranium seawater (estimated at 4.5 billion tons seawater). In this study, we developed effective adsorbent fibers for the recovery from via atom-transfer radical polymerization (ATRP) poly(vinyl chloride)-co-chlorinated chloride) (PVC-co-CPVC) fiber. ATRP was employed surface graft acrylonitrile (AN) and tert-butyl acrylate (tBA), precursors uranium-interacting functional...
Even a small fraction of fine particles can have significant effect on gas production from hydrate-bearing sediments and sediment stability. Experiments were conducted to investigate the role using soil chamber that allows for application an effective stress sediment. This was instrumented monitor shear-wave velocity, temperature, pressure, volume change during CO2 hydrate formation production. The placed inside Oak Ridge National Laboratory Seafloor Process Simulator (SPS), which used...
Mesoporous carbon with a narrow pore size distribution centered at about 9 nm, which was prepared by self assembly of block copolymer and phloroglucinol-formaldehyde resin via the soft-template method, activated CO2 potassium hydroxide (KOH). The effects activation conditions, such as temperature, time, mass ratio KOH/C, on textural properties resulting mesoporous carbons were investigated. Activated exhibit high BET specific surface areas (up to ∼ 2000 m2 g−1) large volumes 1.6 cm3 g−1),...
The Pacific Northwest National Laboratory (PNNL) is evaluating the performance of adsorption materials to extract uranium from natural seawater. Testing consists measurements and other elements seawater as a function time using flow-through columns recirculating flume determine adsorbent capacity kinetics. amidoxime-based polymer AF1, produced by Oak Ridge (ORNL), had 56-day 3.9 ± 0.2 g U/kg material, saturation 5.4 half-saturation 23 2 days. ORNL AF1 has very high affinity for uranium,...
Flow-electrode capacitive deionization (FCDI) can be improved via enhanced charge transfer by increasing the flow-electrode (FE) conductivity. Since water is main component of FE (>70%), key to improving electroconductivity lies in properties carbon materials. In this work, three types powders, i.e., activated (AC), mesoporous carbon, and nanotubes (CNTs), were employed FEs investigate influence powder on FCDI performance. The morphology structure powders electrochemical behavior rheology...
Abstract The energy transition is one of the main challenges our society and therefore a major driver for scientific community. To ensure smart to sustainable future scenario different technologies such as harvesting using solar cells or windmills chemical storage in batteries, super-capacitors hydrogen have be developed ultimately deployed. New fabrication approaches based on additive manufacturing digitalization industrial processes increase potential achieve highly efficient required...