Article
Engineering, Environmental
Gaurav Bhattacharjee, Hari Prakash Veluswamy, Asheesh Kumar, Praveen Linga
Summary: Solidified Natural Gas (SNG) technology provides a compact and safe option for large-scale natural gas storage. Introducing thermodynamic promoters like THF into the classical methane-water system enables rapid gas uptake at moderate pressure and temperature. The study compares the stability of cylindrical mixed methane-THF (sII) and pure methane (sI) hydrate pellets, with results showing exceptional stability of sII hydrates and significant gas evolution from sI hydrates stored at different temperatures. Long-term stability testing of methane-THF (sII) hydrate pellets produced using fresh and seawater demonstrates the commercial viability of SNG technology.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Energy & Fuels
Zhengcai Zhang, Peter G. Kusalik, Guang-Jun Guo, Fulong Ning, Nengyou Wu
Summary: Gas hydrates, both in natural and synthesized forms, exhibit complex grain boundary structures which play a significant role in the dissociation process. The thermal stability of polycrystalline hydrates at grain boundaries is influenced by the guest types and grain boundary structures, with CH4 hydrates dissociating only above bulk melting temperature and CO2 hydrates decomposing differently. Additionally, CO2 molecules can accelerate the dissociation process by inducing gas bubble formation and preferential localization within bubbles, with dissociation initiating from the decomposition of specific cage structures.
Article
Energy & Fuels
Shurraya Denning, Ahmad A. A. Majid, James M. Crawford, Jonathan D. Wells, Moises A. Carreon, Carolyn A. Koh
Summary: Gas hydrates combined with the metal organic framework HKUST-1 show improved methane storage performance. This study demonstrates the scaling up of the system and provides insight into the kinetic effect of HKUST-1 on methane hydrate formation. The results indicate that the addition of HKUST-1 reduces the nucleation induction time, increases the amount and rate of hydrate formation, and operates optimally above the freezing point of ice.
Article
Multidisciplinary Sciences
M. Schioppo, J. Kronjager, A. Silva, R. Ilieva, J. W. Paterson, C. F. A. Baynham, W. Bowden, I. R. Hill, R. Hobson, A. Vianello, M. Dovale-Alvarez, R. A. Williams, G. Marra, H. S. Margolis, A. Amy-Klein, O. Lopez, E. Cantin, H. Alvarez-Martinez, R. Le Targat, P. E. Pottie, N. Quintin, T. Legero, S. Hafner, U. Sterr, R. Schwarz, S. Dorscher, C. Lisdat, S. Koke, A. Kuhl, T. Waterholter, E. Benkler, G. Grosche
Summary: This study reports a comparison of two geographically separated ultrastable lasers over a 2220 km optical fibre link, achieving a fractional frequency instability of 7×10-17. These results are significant for the dissemination of ultrastable light to improve the performance of remote optical clocks.
NATURE COMMUNICATIONS
(2022)
Article
Energy & Fuels
Dehuan Yang, Rongtao Yan, Feng Cheng, Di Lu, Changfu Wei, Huihui Tian
Summary: The low-field NMR method was used to investigate the impact of various experimental conditions on the hydration number during methane hydrate dissociation. It was found that the NMR signal peak value of water was not affected by sediment dry density, gas pressure, and salt concentration, but was significantly influenced by temperature. A relationship among NMR signal peak value, substance content, pressure, and temperature was established to estimate the hydration number of pore hydrates. The experimental results showed that the hydration number of methane hydrates remained practically unchanged during dissociation in fine-grained sediments, and was minimally influenced by experimental conditions.
Article
Chemistry, Physical
Rongdi Pan, Pingping Wang, Shan Jiang, Wenshu Yang, Ping Wu, Jing Qiao, Guoqin Chen, Gaohui Wu
Summary: The characterization and analysis of lattice constant, precipitates, and dislocation density of the material using X-ray diffraction (XRD) and transmission electron microscopy (TEM) reveals the reason why the dimensional change in rolled 2024Al is significantly lower than that in as-cast 2024Al during isothermal aging. This is attributed to the higher dislocation density, lesser decrease in lattice constant, and presence of oriented precipitates with higher content in rolled 2024Al. Additionally, the decrease in lattice constant and the formation and growth of the S phase before and after aging are discussed as the main reasons for the reduced dimensional change in rolled 2024Al.
Article
Engineering, Environmental
Kan Jeenmuang, Phuwadej Pornaroontham, Katipot Inkong, Gaurav Bhattacharjee, Santi Kulprathipanja, Praveen Linga, Pramoch Rangsunvigit
Summary: This study reveals that using amino acids as kinetic promoters can enhance the formation of mixed methane-THF hydrates at room temperature and pressure, with hydrophobic amino acids showing the most significant effect.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Energy & Fuels
Abderrahman Mahiddini, Noureddine Tchouar, Hakim Aguedal, Fouzia Ould-Kaddour, Abedlekader Debab
Summary: In this study, numerical methods were used to investigate the equilibrium conditions of gas hydrates in pure gas and gas mixture up to 200 MPa. The results show that the model is accurate and can be used to study the stability limits of hydrates in a wide range of gas composition and chloride salt solutions.
PETROLEUM SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Chemical
Niraj Thakre, Amiya K. Jana
Summary: This study experimentally and theoretically investigates lattice distortion in refrigerant gas hydrates, proposing a new theoretical model to predict their formation conditions and estimating cavity potential of hydrates using ab initio methodology. It is found that the extent of lattice distortion is linearly related to reference chemical potential and enthalpy differences, and the proposed model outperforms existing thermodynamic models in predicting hydrate formation pressure for a variety of pure and mixed refrigerant hydrates.
Article
Physics, Applied
Simone Colombo, Edwin Pedrozo-Penafiel, Vladan Vuletic
Summary: Recent developments in atomic physics have made it possible to experimentally generate many-body entangled states, thereby enhancing the performance of quantum sensors beyond the Standard Quantum Limit (SQL). This Perspective article describes commonly used experimental methods to create many-body entangled states for operating quantum sensors beyond the SQL. The potential of applying quantum entanglement to state-of-the-art optical atomic clocks is particularly emphasized. Additionally, recently developed time-reversal protocols that utilize complex states with high quantum Fisher information are presented, without requiring sub-SQL measurement resolution. The prospects of achieving near-Heisenberg limited quantum metrology based on such protocols are discussed.
APPLIED PHYSICS LETTERS
(2022)
Article
Environmental Sciences
D. V. Antonov, I. G. Donskoy, O. S. Gaidukova, S. Ya. Misyura, V. S. Morozov, G. S. Nyashina, P. A. Strizhak
Summary: The dissociation and combustion behavior of double gas hydrates in a tubular muffle furnace were studied to improve combustion efficiency and reduce gas emissions. The experiments and simulations showed that double gas hydrates have more stable combustion and their dissociation rate increases with temperature. The presence of heavy hydrocarbons in double gas hydrates reduces unburned CH4 emissions, but increases CO2 emissions. Furnace temperature and gas hydrate composition also impact anthropogenic gas emissions.
ENVIRONMENTAL RESEARCH
(2022)
Article
Physics, Multidisciplinary
Frederic Caupin, Mikhail A. Anisimov
Summary: Liquid polyamorphism refers to the ability of a single-component substance to exist in multiple liquid phases. A minimal model has been proposed to explain this phenomenon using a binary lattice model, providing unprecedented insights into the phase behaviors of interconverting fluids. This model offers a unified theoretical framework to describe supercooled water and other polyamorphic liquids with waterlike anomalies.
PHYSICAL REVIEW LETTERS
(2021)
Article
Biochemistry & Molecular Biology
Wenbo Lv, Cunbao Deng, Zhixin Jin, Hao Zhang, Yansheng Wang
Summary: In this study, we simulated the effects of three cyclic organic compounds on the stability of LCCBM hydrate and found that CP exhibited the best facilitation effect in maintaining the stability of the hydrate at T = 293 K. CP-one could maintain the essential stability of the hydrate structure, although the orderliness decreased significantly. However, the hydrate structure containing CP-ol was destroyed at T = 293 K.
Article
Green & Sustainable Science & Technology
Chuanliang Yan, Leifeng Dong, Xu Ren, Yuanfang Cheng
Summary: Replacing methane in natural gas hydrates with carbon dioxide can sequester CO2 in the seabed while developing natural gas, making it an environmentally friendly energy production and carbon sequestration mode. A dynamic evolution model and a multi-field coupling model were established to study the mechanical and physical parameters evolution during CH4-CO2 replacement in a NGH reservoir. The results show that the saturation positively affects the mechanical parameters of NGH and CO2 hydrate bearing sediment samples, while the generation of CO2 hydrates decreases the permeability of the reservoir.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Energy & Fuels
Byeonggwan Lee, Kyuchul Shin, Saman Alavi, John A. Ripmeester
Summary: In this study, the effect of NH4F doping on N-2, O-2, and CH4 hydrates was investigated. The results showed that NH4F doping can modify the size and electrostatic charge distribution of molecules within the hydrate cages, and induce a transition in the preferred structure of N2 hydrate. These findings suggest that crystal engineering of hydrate lattices can be a potential approach to enhance hydrate-based gas separation technologies.
Editorial Material
Multidisciplinary Sciences
Thomas C. Hansen
Summary: Water ice is found in various environments across the universe, and the construction of the phase diagram for crystalline phases of ice is still ongoing. A recently reported high-pressure phase, ice XIX, has ambiguous structure that requires further study.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Raphael Finger, Nadine Kurtzemann, Thomas C. Hansen, Holger Kohlmann
Summary: A sapphire single-crystal gas-pressure cell has been developed for in situ neutron powder diffraction, allowing unobstructed optical access by neutrons. It successfully tested high-pressure hydrogen (deuterium) gas performance at different temperatures. The cell provides detailed descriptions of all components and offers high time resolution for studying reaction pathways involving hydrogen (deuterium) uptake or release.
JOURNAL OF APPLIED CRYSTALLOGRAPHY
(2021)
Article
Chemistry, Physical
Mikhail A. Kuzovnikov, Vladimir E. Antonov, Thomas Hansen, Alexandre S. Ivanov, Alexander Kolesnikov, Valery Kulakov, Vitaly D. Muzalevsky, Stanislav Savvin, Marek Tkacz
Summary: Three hydrides - PdHx, MoHx, and TiHx - exhibit an inverse isotope effect in superconductivity, where the phase with a heavier hydrogen isotope, deuterium, has a higher critical temperature. The origin of this effect is not yet certain, but the commonly accepted explanation points to the strong anharmonicity of optical hydrogen vibrations.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Crystallography
Raphael Finger, Marc Widenmeyer, Thomas C. Hansen, Dirk Wallacher, Stanislav Savvin, Marko Bertmer, Anke Weidenkaff, Holger Kohlmann
Summary: Temperature-dependent crystal structure alterations in Ba2In2O5, particularly with Cr doping, result in significant disorder and stabilization of the tetragonal polymorph, while high water content leads to a dynamic situation for the protons. These findings provide insight into how to adjust the physical properties of Ba2In2O5 for different applications.
Article
Chemistry, Multidisciplinary
Raphael Finger, Thomas C. Hansen, Holger Kohlmann
Summary: In situ neutron diffraction is an important technique for characterizing functional materials. A new sapphire single-crystal gas-pressure cell has been developed and evaluated, allowing for studying materials under different temperature and hydrogen pressure conditions. The cell has higher maximum temperatures and lower background noise compared to earlier versions.
JOURNAL OF APPLIED CRYSTALLOGRAPHY
(2022)
Article
Chemistry, Physical
Gohil S. Thakur, Thomas C. Hansen, Walter Schnelle, Shuping Guo, Oleg Janson, Jeroen van den Brink, Claudia Felser, Martin Jansen
Summary: The synthesis, crystal structure, and magnetic properties of a new 2:1 ordered triple perovskite Sr3CaOs2O9 were reported. It exhibits a unique buckled honeycomb lattice of osmium, high Neel temperature of approximately 385 K, and electrical insulating behavior.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Inorganic & Nuclear
Simon R. Larsen, Vitalii Shtender, Daniel Hedlund, Erna K. Delczeg-Czirjak, Premysl Beran, Johan Cedervall, Alena Vishina, Thomas C. Hansen, Heike C. Herper, Peter Svedlindh, Olle Eriksson, Martin Sahlberg
Summary: The atomic and magnetic structures of Mn(Co,Ge)2, which crystallizes in a superstructure of the MgZn2-type structure, have been reported. The system exhibits different magnetic structures at different temperatures.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Physical
Rasmus Palm, Kenneth Tuul, Frank Elson, Elisabetta Nocerino, Ola K. Forslund, Thomas C. Hansen, Jaan Aruvali, Martin Mansson
Summary: This study investigates the influence of adding relatively low amounts of mesoporous carbon black on the decomposition and reforming processes of hydrogen storage material NaAlH4 through in situ diffraction. The results show that even with low concentrations, mesoporous carbon black can significantly enhance the reversibility of hydrogen storage in NaAlH4.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Materials Science, Ceramics
Ahmet Bahadir Yildiz, Hu Yixuan, R. Prasath Babu, Thomas C. Hansen, Mirva Eriksson, Kolan Madhav Reddy, Peter Hedstro
Summary: We have designed a novel multi-principal element carbide system (Ti,Zr,Hf,W)C and successfully synthesized a single-phase (Ti,Zr,Hf,W)C. The material exhibits high nanohardness and fracture toughness. Aging studies show the stability of the single-phase carbide solid solution even within the predicted miscibility gap of the system. Electron microscopy characterization reveals phase separation and the formation of lamellar structure and precipitates. The decomposition kinetics is sluggish due to reduced driving force.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Crystallography
Andre Goetze, Siobhan Christina Stevenson, Thomas Christian Hansen, Holger Kohlmann
Summary: Binary intermetallic compounds, such as FePd3, have attracted attention due to their physical, magnetic, and catalytic properties. In this study, the hydrogenation properties of ordered FePd3 and disordered Fe0.25Pd0.75 were investigated using various in situ methods. The results showed that FePd3 absorbs small amounts of hydrogen at room temperature and follows the Sieverts' law. The [Pd-6] octahedral voids were filled with hydrogen atoms as the hydrogen pressure increased, leading to a decrease in long-range order of Fe and Pd atoms. The magnetic moments of iron atoms in FePd3 exhibited a temperature dependence that was consistent with a 3D Ising or Heisenberg model.
Article
Chemistry, Multidisciplinary
Sandeep K. Gupta, Hannah H. Nielsen, Andreas M. Thiel, Emil A. . Klahn, Erxi Feng, Huibo B. Cao, Thomas C. Hansen, Eddy Lelievre, Arsen Gukasov, Iurii Kibalin, Sebastian Dechert, Serhiy Demeshko, Jacob Overgaard, Franc Meyer, Franc Meyer
Summary: In this study, a highly anisotropic single-ion magnet (SIM) with stability under ambient conditions was synthesized and comprehensively characterized. The influence of the ligand field on the degeneracy and population of d-orbitals in a specific coordination environment was investigated, providing important insights for the rational design and enhancement of magnetic anisotropy in SIMs.
Article
Materials Science, Multidisciplinary
John M. Wilkinson, Stephen J. Blundell, Sebastian Biesenkamp, Markus Braden, Thomas C. Hansen, Kacper Koteras, Wojciech Grochala, Paolo Barone, Jose Lorenzana, Zoran Mazej, Gasper Tavcar
Summary: KAgF3 is a quasi-one-dimensional quantum antiferromagnet with interesting structural and magnetic transitions. At low temperatures, it orders as an A-type antiferromagnet with an ordered moment. Previous magnetometry study provides evidence for an intermediate phase at T-N1 < T < T-N2, but its nature remains unknown.
Article
Chemistry, Multidisciplinary
Daniel Risskov Sorensen, Andreas Ostergaard Drejer, Michael Heere, Anatoliy Senyshyn, Matthias Frontzek, Thomas Hansen, Christophe Didier, Vanessa K. Peterson, Dorthe Bomholdt Ravnsbaek, Mads Ry Vogel Jorgensen
Summary: In operando powder diffraction is a powerful tool for investigating battery electrode materials. While X-ray powder diffraction is routine, neutron powder diffraction is still less established. Researchers have developed a new electrochemical cell for in operando neutron powder diffraction that is easy to use and can cycle electrode materials under electrochemical conditions similar to standard laboratory cells.
Article
Materials Science, Multidisciplinary
N. Qureshi, H. E. Fischer, S. X. M. Riberolles, T. C. Hansen, M. Ciomaga Hatnean, O. A. Petrenko
Summary: In this study, we investigate the short-range magnetic spin correlations in two compounds of rare-earth strontium oxides using total-scattering powder neutron diffraction, reverse Monte Carlo simulations, and magnetic pair-distribution function analysis. The compounds exhibit a distorted honeycomb lattice, leading to significant geometrical frustration due to antiferromagnetic exchange between magnetic ions. The results demonstrate the ordering of the short-range spin correlations above the respective Néel temperatures, indicating the dominance of nearest and next-nearest interactions.
Article
Physics, Multidisciplinary
Qianhui Xu, Yi Liu, Sijie Hao, Jiahui Qian, Cheng Su, Chin-Wei Wang, Thomas Hansen, Zhendong Fu, Yixi Su, Wei Li, Guang-Han Cao, Yinguo Xiao, Wentao Jin
Summary: The ground-state magnetic structures of Eu2+ spins in RbEu(Fe1-xNix)(4)As-4 superconductors have been studied using neutron powder diffraction measurements. It is observed that the magnetic propagation vector of the Eu sublattice diminishes with increasing Ni doping, leading to a reduction in the rotation angle between neighboring Eu layers. The magnetic structure transitions from a helical modulation to a collinear ferromagnetic structure as the superconductivity is suppressed.
PHYSICAL REVIEW RESEARCH
(2022)