A5062195363- Methane Hydrates and Related Phenomena
- Spacecraft and Cryogenic Technologies
- Hydrocarbon exploration and reservoir analysis
- Atmospheric and Environmental Gas Dynamics
- CO2 Sequestration and Geologic Interactions
- Offshore Engineering and Technologies
- Enhanced Oil Recovery Techniques
- Hydraulic Fracturing and Reservoir Analysis
- Catalytic Processes in Materials Science
- Fluid Dynamics Simulations and Interactions
- Astro and Planetary Science
- Petroleum Processing and Analysis
- Zeolite Catalysis and Synthesis
- Inorganic Fluorides and Related Compounds
- Catalysis and Oxidation Reactions
- Mesoporous Materials and Catalysis
- Geology and Paleoclimatology Research
- Quantum, superfluid, helium dynamics
- Carbon Dioxide Capture Technologies
- Arctic and Antarctic ice dynamics
- Silicon Nanostructures and Photoluminescence
- Planetary Science and Exploration
- Phase Equilibria and Thermodynamics
- Particle Dynamics in Fluid Flows
- Hydrogen Storage and Materials
Colorado School of Mines
2016-2025
University of Minnesota
2022
New York University
2021
Rensselaer Polytechnic Institute
2020
Khalifa University of Science and Technology
2018
The University of Western Australia
2015
BioLegend (United States)
2011
Technical University of Denmark
2010
National Geophysical Research Institute
2009-2010
Osaka University
2009-2010
Thermodynamic, x-ray diffraction, and Raman nuclear magnetic resonance spectroscopy measurements show that clusters of H2 can be stabilized stored at low pressures in a sII binary clathrate hydrate. Clusters molecules occupy small water cages, whereas large cages are singly occupied by tetrahydrofuran. The presence this second guest component stabilizes the 5 megapascals 279.6 kelvin, versus 300 280 kelvin for pure
Despite the industrial implications and worldwide abundance of gas hydrates, formation mechanism these compounds remains poorly understood. We report direct molecular dynamics simulations spontaneous nucleation growth methane hydrate. The multiple-microsecond trajectories offer detailed insight into process hydrate nucleation. Cooperative organization is observed to lead adsorption onto planar faces water fluctuating dissociation early cages. cages are mostly face-sharing partial small...
Summary Gas hydrates (GHs) are a vast energy resource with global distribution in the permafrost and oceans. Even if conservative estimates considered only small fraction is recoverable, sheer size of so large that it demands evaluation as potential source. In this review paper, we discuss natural GH accumulations, status primary international research development (R&D) programs, remaining science technological challenges facing commercialization production. After brief examination...
Clathrate hydrates have steadily emerged as an important field in the areas of flow assurance, energy storage and resource, environment. To better understand role all these areas, knowledge developed laboratory experiments must be effectively transferred to address challenges related hydrate formation, dissociation, agglomeration, stability. This paper highlights recent literature focusing on thermodynamics, kinetics, structural properties, particle rheological molecular mechanisms...
Summary The current paper complements the Moridis et al. (2009) review of status effort toward commercial gas production from hydrates. We aim to describe concept gas-hydrate (GH) petroleum system; discuss advances, requirements, and suggested practices in GH prospecting deposit characterization; associated technical, economic, environmental challenges uncertainties, which include following: accurate assessment producible fractions resource; development methods for identifying suitable...
Recognizing the importance of methane hydrate research and need for a coordinated effort, United States Congress enacted Methane Hydrate Research Development Act 2000. At same time, Ministry International Trade Industry in Japan launched program to develop plans exploratory drilling project Nankai Trough. India, China, Republic Korea, other nations also have established large development programs. Government-funded scientific expeditions production test studies provided wealth information on...
The present work uses a micromechanical force apparatus to directly measure cyclopentane clathrate hydrate cohesive and hydrate-steel adhesive force, as function of contact time, temperature. We interparticle model, which includes capillary sintering contributions is based on fundamental theories. In this process, we estimate the tensile strength be approximately 0.91 MPa. This model also predicts effect temperature particle cohesion force. Finally, first direct measurements in gas phase 9.1...
The hydrogen storage capacity of binary THF−H2 clathrate hydrate has been determined as a function formation pressure, THF composition, and time. amount stored in the stoichiometric increases with pressure exhibits asymptotic (Langmuir) behavior to approximately 1.0 wt % H2. This concentration corresponds one molecule occupying each small 512 cavities large 51264 cavity framework. Contrary previous reports, was not increased upon decreasing below 5.6 mol solution 0.5 %, at constant even...
Methane hydrate nucleation rates are reported from over 200 μs of molecular dynamics simulations across a range thermodynamic conditions and varying degrees methane–water interfacial curvature. Calculated increase with aqueous phase methane concentration (XCH4), consistent experimental results. The effect curvature on XCH4 is quantified, dissolved increasing the degree (i.e., number dimensions in which exists). Nucleation for system sizes 3456 13 824 molecules (H2O + CH4). Among smaller...
Abstract Interference lithography (IL) holds the promise of fabricating large‐area, defect‐free 3D structures on submicrometer scale both rapidly and cheaply. A stationary spatial variation intensity is created by interference two or more beams light. The pattern that emerges out distribution transferred to a light sensitive medium, such as photoresist, after development yields bicontinuous photoresist/air structure. Importantly, proper choice beam parameters one can control geometrical...
A review of surface chemistry concepts is presented, with the principal objective identifying interfacial phenomena and interactions involved in gas hydrate formation agglomeration oil pipelines. There are five types interfaces where hydrates may form aggregate: gas/liquid, liquid/liquid, gas/solid, liquid/solid, solid/solid; hydrocarbon gas, liquid either oil, water, or condensate, solid pipe wall surface. fundamental can help create a better understanding at these interfaces, industry move...
The size of droplets in emulsions is important many industrial, biological, and environmental systems, as it determines the stability, rheology, area available emulsion for physical or chemical processes that occur at interface. While balance fluid inertia surface tension determining droplet under turbulent mixing inertial subrange has been well established, classical scaling prediction by Shinnar half a century ago dependence on viscosity continuous phase viscous not clearly validated...
Hydrogen hydrates with tetrahydrofuran (THF) as a promoter molecule are investigated to probe critical unresolved observations regarding cage occupancy and storage capacity. We adopted new preparation method, mixing solid powdered THF ice pressurizing hydrogen at 70 MPa 255 ± 2 K (these formation conditions insufficient form pure hydrates). All results from Raman microprobe spectroscopy, powder X-ray diffraction, gas volumetric analysis show strong dependence of capacity on composition....