Article
Energy & Fuels
Yu Wei, Qimeng Yang, Xuehua Zhang, Nobuo Maeda
Summary: This study investigated the shear strength of THF hydrate on substrates with different hydrophobicity and the impact of PVP. The results showed a decrease in critical shear stress with heating and an increase with the addition of PVP. Interestingly, the hydrates exhibited higher adhesive strength on hydrophobic substrates compared to hydrophilic ones.
Article
Chemistry, Physical
Yogeshwaran Krishnan, Mohammad Reza Ghaani, Niall J. English
Summary: The passage predicts the leakage of hydrogen and deuterium from sII clathrate hydrates through simulations, and analyzes the impact of different large-cage occupancies on the intercage hopping of hydrogen and deuterium.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Energy & Fuels
Gustavo A. B. Sandoval, Marcio Couto Ozorio, Monica F. Naccache, Paulo R. de Souza Mendes, Amadeu K. Sum, Leandro Valim, Adriana Teixeira
Summary: This work presents a rheological analysis of cyclopentane hydrates formed in water-in-oil emulsions, investigating the influence of parameters such as pretreatment temperatures and cooling/heating rates. The study shows that the resulting hydrate slurry exhibits elasticity and shear thinning behavior, likely caused by breakdown of hydrate structures and alignment of hydrate agglomerates to the flow.
Article
Engineering, Multidisciplinary
T. I. Zohdi, G. J. Moridis
Summary: This work presents a model and rapid simulation strategy for the electrically-driven dissociation of subsurface gas hydrates. The objective is to develop an easy-to-calibrate model and strategy that can guide the delivery of current, electric field, and Joule heating. The model allows for rapid computation, making it suitable for parameter variation and data-model calibration using Machine Learning paradigms.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2023)
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
Energy & Fuels
Xiaodan Zhu, Alejandro D. Rey, Phillip Servio
Summary: Natural gas, recognized as a green energy resource, has the potential to generate energy with fewer pollutants and carbon dioxide emissions compared to coal and petroleum. It is also considered a competitive candidate for carbon dioxide sequestration. However, the instability of gas hydrates during exploration poses a major barrier to methane gas extraction and carbon dioxide sequestration. This study investigates the stability limits and piezo effect of structure I (sI) methane gas hydrates at 0 K using a multiscale approach, providing valuable insights for engineering correlations and fundamental understanding.
Article
Thermodynamics
Dmitrii V. Antonov, Elena A. Shchepakina, Vladimir A. Sobolev, Sergey Y. Misyura, Igor G. Donskoy, Pavel A. Strizhak, Sergei S. Sazhin
Summary: In this study, a simple model of methane dissociation from methane-hydrate particles is proposed. The model assumes that methane-hydrate particles form a porous film and are heated by ambient air convection. When the temperature of the methane-hydrate reaches the critical temperature, all methane is released and turns into ice. The model shows good agreement with experimental results at the initial stage but predicts faster methane release over time.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Chemistry, Physical
Pinqiang Cao
Summary: This study investigated the mechanical properties of amorphous methane hydrates for the first time, proposing an order parameter and a multi-step deformation mechanism core to explain their mechanical characteristics. Through an in-depth analysis of amorphous methane hydrates, the research not only expanded our understanding of their mechanical responses in geological systems but also offered a fresh perspective on structure-property topics of solid materials in future science and technology.
JOURNAL OF PHYSICAL CHEMISTRY B
(2021)
Article
Chemistry, Physical
Mehrdad Vasheghani Farahani, Aliakbar Hassanpouryouzband, Jinhai Yang, Bahman Tohidi
Summary: A coupled geophysical-geothermal scheme is developed for predicting hydrate saturation in gas hydrate-bearing permafrost sediments, incorporating geophysical and geothermal responses. The scheme shows promising results in quantifying the saturation of co-existing phases with acceptable accuracy.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Xinyu Yin, Yuanyang Yan, Xiangning Zhang, Bin Bao, Pihui Pi, Yahong Zhou, Xiufang Wen, Lei Jiang
Summary: Inspired by glass sponges, researchers have developed a robust superhydrophobic three-dimensional porous skeleton that effectively inhibits hydrate nucleation while maintaining superhydrophobicity. The skeleton's high specific area allows for increased content of inhibitory groups without compromising its superhydrophobic properties, achieving inhibition of fresh hydrates and preventing adhesion to formed hydrates. Molecular dynamics simulations and experimental data demonstrate the effectiveness of the skeleton in prolonging hydrate formation induction time and reducing hydrate adhesive force. This research opens up new possibilities for novel materials in various industries, including oil and gas, carbon capture and storage.
ACS CENTRAL SCIENCE
(2023)
Review
Chemistry, Multidisciplinary
Jyotirmoy Ghosh, Gaurav Vishwakarma, Rajnish Kumar, Thalappil Pradeep
Summary: Through multiple studies in a simulated interstellar environment, we have discovered several molecules' clathrate hydrates (CHs). These CHs play an important role in the chemical processes of the interstellar medium, contributing to the chemical evolution and formation of planetary systems as well as the origin of life.
ACCOUNTS OF CHEMICAL RESEARCH
(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.
Article
Chemistry, Physical
Henrik Andersen Sveinsson, Fulong Ning, Pinqiang Cao, Bin Fang, Anders Malthe-Sorenssen
Summary: In polycrystalline methane hydrates, different shear behaviors exist depending on the grain sizes, with strengthening behavior and weakening behavior being two distinct modes of shear behavior.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Astronomy & Astrophysics
Oliver E. K. Rice, Anthony R. Yeates
Summary: This study introduces an improved magnetic field model for calculating magneto-frictional equilibrium in the solar corona, which shows better fit to observational data and takes similar computation time compared to the potential field model. The model provides a practical alternative for initializing time-evolving simulations and modeling the heliospheric magnetic field.
ASTROPHYSICAL JOURNAL
(2021)
Article
Energy & Fuels
Guobiao Zhang, Youhong Sun, Bing Li, Yifeng Shen, Yun Qi
Summary: Research has found that in the dissociation of mixed hydrates, CH4 and C2H6 are preferentially released over C3H8. Gas sweep method can continue the decomposition of mixed hydrates and recover more C3H8 at the beginning. The formation and decomposition of the C3H8-rich hydrate shell may control the decomposition rate of mixed hydrates.
