1
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Li K, Chen B, Yang M, Song Y, Sum AK. Methane hydrate phase equilibrium considering dissolved methane concentrations and interfacial geometries from molecular simulations. J Chem Phys 2023; 159:244505. [PMID: 38153154 DOI: 10.1063/5.0174705] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2023] [Accepted: 12/05/2023] [Indexed: 12/29/2023] Open
Abstract
Natural gas hydrates, mainly existing in permafrost and on the seabed, are expected to be a new energy source with great potential. The exploitation technology of natural gas hydrates is one of the main focuses of hydrate-related studies. In this study, a large-size liquid aqueous solution wrapping a methane hydrate system was established and molecular dynamics simulations were used to investigate the phase equilibrium conditions of methane hydrate at different methane concentrations and interfacial geometries. It is found that the methane concentration of a solution significantly affects the phase equilibrium of methane hydrates. Different methane concentrations at the same temperature and pressure can lead to hydrate formation or decomposition. At the same temperature and pressure, in a system reaching equilibrium, the size of spherical hydrate clusters is coupled to the solution concentration, which is proportional to the Laplace pressure at the solid-liquid interface. Lower solution concentrations reduce the phase equilibrium temperature of methane hydrates at the same pressure; as the concentration increases, the phase equilibrium temperature gradually approaches the actual phase equilibrium temperature. In addition, the interfacial geometry of hydrates affects the thermodynamic stability of hydrates. The spherical hydrate particles have the highest stability for the same volume. Through this study, we provide a stronger foundation to understand the principles driving hydrate formation/dissociation relevant to the exploitation of methane hydrates.
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Affiliation(s)
- Kehan Li
- Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian, China
- Phases to Flow Laboratory, Chemical & Biological Engineering Department, Colorado School of Mines, Golden, Colorado 80401, USA
| | - Bingbing Chen
- Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian, China
| | - Mingjun Yang
- Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian, China
| | - Yongchen Song
- Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian, China
| | - Amadeu K Sum
- Phases to Flow Laboratory, Chemical & Biological Engineering Department, Colorado School of Mines, Golden, Colorado 80401, USA
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2
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Song Y, Li K, Sun H, Chen B, Yang M. New Sights on derived behaviors of methane hydrate molecular structure in Na+/Cl- ions invading process. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120951] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
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3
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Formation of the structure-II gas hydrate from low-concentration propane mixed with methane. Chin J Chem Eng 2022. [DOI: 10.1016/j.cjche.2022.10.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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4
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Abstract
Clathrate hydrates have diverse crystal structures, and among them, the three (sI, sII, and sH) most prevalent ones cover nearly all known structures, while the norm is to consider other structures only when specific guest molecules are present. Here we report the observation of a hidden clathrate structure: the tetragonal structure (TS-I) in commonly formed gas hydrates, as evidenced from molecular dynamics simulations. We show that when two (or more) sI crystal grains with different growth directions come into contact or when the growth of a sI crystal encounters geometrical frustration, the TS-I results as a cocrystal. We give evidence that TS-I may also play an important role in the combination and/or transition between sI and sII. These results imply that this previously neglected structure may be commonly present whenever sI or sII is formed. This hidden structure must be identified, experimentally and in simulations; confining the possible structures may hinder an in-depth understanding of clathrate hydrates.
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Affiliation(s)
- Yong Chen
- Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, P. R. China
- Phases to Flow Laboratory, Chemical & Biological Engineering Department, Colorado School of Mines, Golden, Colorado 80401, United States
| | - Satoshi Takeya
- National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), Central 5, 1-1-1 Higashi, Tsukuba 305-8565, Japan
| | - Amadeu K Sum
- Phases to Flow Laboratory, Chemical & Biological Engineering Department, Colorado School of Mines, Golden, Colorado 80401, United States
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5
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Molecular insights into the heterogeneous crystal growth of tetrahydrofuran hydrate: Kinetic and interfacial properties. J Mol Graph Model 2022; 115:108205. [DOI: 10.1016/j.jmgm.2022.108205] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2022] [Revised: 04/17/2022] [Accepted: 04/23/2022] [Indexed: 11/22/2022]
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6
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A review of clathrate hydrate nucleation, growth and decomposition studied using molecular dynamics simulation. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2021.118025] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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7
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Fernández-Fernández ÁM, Pérez-Rodríguez M, Piñeiro MM. Molecular dynamics of fluoromethane type I hydrates. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.116720] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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8
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Abstract
Water and methane can stay together under low temperature and high pressure in the forms of liquid solutions and crystalline solids. From liquid and gaseous states to crystalline solids or the contrary processes, amorphous methane hydrates can occur in these evolution scenarios. Herein, mechanical properties of amorphous methane hydrates are explored for the first time to bridge the gap between mechanical responses of monocrystalline and polycrystalline methane hydrates. Our results demonstrate that mechanical properties of amorphous methane hydrates are strongly governed by our original proposed order parameter, namely, normalized hydrogen-bond directional order parameter. Followed by this important achievement, a multistep deformation mechanism core is proposed to explain mechanical properties of amorphous methane hydrates. Through an extensive detailed analysis of amorphous methane hydrates, our simulation results not only greatly enlarge our fundamental understanding for mechanical responses of amorphous methane hydrates in geological systems but also offer a fresh perspective in structure-property topics of solid materials in future science and technology.
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Affiliation(s)
- Pinqiang Cao
- School of Resource and Environmental Engineering, Wuhan University of Science and Technology, Wuhan, Hubei 430081, China
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9
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Thakre N, Palodkar AV, Dongre HJ, Jana AK. Microscopic Molecular Insights into Hydrate Formation and Growth in Pure and Saline Water Environments. J Phys Chem A 2020; 124:4241-4252. [PMID: 32368914 DOI: 10.1021/acs.jpca.0c00621] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The growth dynamics of natural gas hydrates in saline water has been studied using copious experiments and spectroscopic observations; however, the microscopic evidences to the structural and molecular transformations that they have provided are poorly understood. In this view, we perform extensive molecular dynamics simulations to gain physical insights into the formation and growth mechanism of naturally occurring gas hydrates with a wide variation in the amount of methane (1:5 to 1:18 methane/water ratio) in pure and salt (0-5 wt %) water environments at 50 MPa and 260 K. A couple of new findings analyzed from the number of cages and F4φ order parameter are as follows: (a) 1:6 (methane/water ratio) is an optimum ratio for the rapid growth of a properly ordered hydrate in pure water at which the hydrate growth retards with increasing salt concentration, (b) there is an inconsequential difference between methane hydrate dynamics in pure water and 0.8 and 1.5 wt % salt water at a ratio of 1:12 (methane/water), and (c) lower methane (1:18) and salt (0.8 wt %) concentrations promote hydrate growth. Besides, this study observes the structural coexistence of S-I and S-II methane hydrates as the large 51264 cages appear along with the small 512 and large 51262 cages, in which the low methane concentration favors the S-II structure.
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Affiliation(s)
- Niraj Thakre
- Energy and Process Engineering Laboratory, Department of Chemical Engineering, Indian Institute of Technology Kharagpur, Kharagpur 721302, India
| | - Avinash V Palodkar
- Energy and Process Engineering Laboratory, Department of Chemical Engineering, Indian Institute of Technology Kharagpur, Kharagpur 721302, India
| | - Harshal J Dongre
- Energy and Process Engineering Laboratory, Department of Chemical Engineering, Indian Institute of Technology Kharagpur, Kharagpur 721302, India
| | - Amiya K Jana
- Energy and Process Engineering Laboratory, Department of Chemical Engineering, Indian Institute of Technology Kharagpur, Kharagpur 721302, India
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10
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Liu T, Liu N, Chen L. Microscopic Insights into the Formation of Methane Hydrate in the Absence/Presence of Electrolyte Ions. ChemistrySelect 2020. [DOI: 10.1002/slct.201904693] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Tingsong Liu
- University of Shanghai for Science and Technology School of Energy and Power EngineeringUniversity of Shanghai for Science and Technology Shanghai China
| | - Ni Liu
- University of Shanghai for Science and Technology School of Energy and Power EngineeringUniversity of Shanghai for Science and Technology Shanghai China
| | - Litao Chen
- University of Shanghai for Science and Technology School of Energy and Power EngineeringUniversity of Shanghai for Science and Technology Shanghai China
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11
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Unbiased atomistic insight in the competing nucleation mechanisms of methane hydrates. Proc Natl Acad Sci U S A 2019; 116:19305-19310. [PMID: 31501333 PMCID: PMC6765301 DOI: 10.1073/pnas.1906502116] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Mixtures of methane gas and water can form ice-like solid methane hydrates via homogeneous nucleation at natural, moderate conditions. Understanding the formation of the different hydrate polymorphs, required for improved control of crystallization, is hampered by limited experimental resolution. Direct molecular dynamics simulations could provide insight, but it would require computation times beyond the age of the Universe for a single nucleation event to take place. Yet, the nucleation event itself, while rare, occurs fast. Therefore, we sample and examine ensembles of rare unbiased nucleation trajectories. Detailed analysis shows how selection between competing amorphous and crystalline polymorph formation mechanisms takes place. The conclusions shed light onto the formation of clathrate hydrates. Methane hydrates have important industrial and climate implications, yet their formation via homogeneous nucleation under natural, moderate conditions is poorly understood. Obtaining such understanding could lead to improved control of crystallization, as well as insight into polymorph selection in general, but is hampered by limited experimental resolution. Direct molecular dynamics simulations using atomistic force fields could provide such insight, but are not feasible for moderate undercooling, due to the rare event nature of nucleation. Instead, we harvest ensembles of the rare unbiased nucleation trajectories by employing transition path sampling. We find that with decreasing undercooling the mechanism shifts from amorphous to crystalline polymorph formation. At intermediate temperature the 2 mechanisms compete. Reaction coordinate analysis reveals the amount of a specific methane cage type is crucial for crystallization, while irrelevant for amorphous solids. Polymorph selection is thus governed by kinetic accessibility of the correct cage type and, moreover, occurs at precritical nucleus sizes, apparently against Ostwald’s step rule. We argue that these results are still in line with classical nucleation theory. Our findings illuminate how selection between competing methane hydrate polymorphs occurs and might generalize to other hydrates and molecular crystal formation.
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12
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Kondori J, Zendehboudi S, James L. Molecular dynamic simulations to evaluate dissociation of hydrate structure II in the presence of inhibitors: A mechanistic study. Chem Eng Res Des 2019. [DOI: 10.1016/j.cherd.2019.05.048] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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13
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Nakate P, Ghosh B, Das S, Roy S, Kumar R. Molecular dynamics study on growth of carbon dioxide and methane hydrate from a seed crystal. Chin J Chem Eng 2019. [DOI: 10.1016/j.cjche.2019.02.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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14
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English NJ, Ghaani MR. Hybrid versus global thermostatting in molecular-dynamics simulation of methane-hydrate crystallisation. Chin J Chem Eng 2019. [DOI: 10.1016/j.cjche.2019.02.034] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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15
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Striolo A. Clathrate hydrates: recent advances on CH4 and CO2 hydrates, and possible new frontiers. Mol Phys 2019. [DOI: 10.1080/00268976.2019.1646436] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Alberto Striolo
- Department of Chemical Engineering, University College London, London, UK
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16
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Liang S, Hall KW, Laaksonen A, Zhang Z, Kusalik PG. Characterizing key features in the formation of ice and gas hydrate systems. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2019; 377:20180167. [PMID: 30982452 PMCID: PMC6501917 DOI: 10.1098/rsta.2018.0167] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 02/26/2019] [Indexed: 05/16/2023]
Abstract
Crystallization in liquids is critical to a range of important processes occurring in physics, chemistry and life sciences. In this article, we review our efforts towards understanding the crystallization mechanisms, where we focus on theoretical modelling and molecular simulations applied to ice and gas hydrate systems. We discuss the order parameters used to characterize molecular ordering processes and how different order parameters offer different perspectives of the underlying mechanisms of crystallization. With extensive simulations of water and gas hydrate systems, we have revealed unexpected defective structures and demonstrated their important roles in crystallization processes. Nucleation of gas hydrates can in most cases be characterized to take place in a two-step mechanism where the nucleation occurs via intermediate metastable precursors, which gradually reorganizes to a stable crystalline phase. We have examined the potential energy landscapes explored by systems during nucleation, and have shown that these landscapes are rugged and funnel-shaped. These insights provide a new framework for understanding nucleation phenomena that has not been addressed in classical nucleation theory. This article is part of the theme issue 'The physics and chemistry of ice: scaffolding across scales, from the viability of life to the formation of planets'.
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Affiliation(s)
- Shuai Liang
- Key Laboratory of Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangdong Key Laboratory of New and Renewable Energy Research and Development, Guangzhou, People's Republic of China
| | - Kyle Wm. Hall
- Department of Chemistry, Temple University, Philadelphia, PA, USA
| | - Aatto Laaksonen
- Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, Stockholm, Sweden
- Department of Chemistry-Ångström Laboratory, Uppsala University, 75121 Uppsala, Sweden
- Centre of Advanced Research in Bionanoconjugates and Biopolymers, Petru Poni Institute of Macromolecular Chemistry, Aleea Grigore Ghica-Voda, 41A, 700487 Iasi, Romania
| | - Zhengcai Zhang
- Department of Chemistry, University of Calgary, Calgary, Canada
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17
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Ghaani MR, English NJ. Hydrogen-/propane-hydrate decomposition: thermodynamic and kinetic analysis. Mol Phys 2019. [DOI: 10.1080/00268976.2019.1567845] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Mohammad Reza Ghaani
- School of Chemical and Bioprocess Engineering, University College Dublin, Dublin, Ireland
| | - Niall J. English
- School of Chemical and Bioprocess Engineering, University College Dublin, Dublin, Ireland
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18
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Ghaani MR, English NJ. Non-equilibrium molecular-dynamics study of electromagnetic-field-induced propane-hydrate dissociation. J Chem Phys 2018; 149:124702. [PMID: 30278679 DOI: 10.1063/1.5029457] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Non-equilibrium molecular-dynamics simulations have been performed for dissolution of planar propane-hydrate/water interfaces in externally-applied electromagnetic (e/m) fields in the microwave to far infrared range (∼2.45-200 GHz) at electric-field intensities up to 2.0 V/nm and at roughly 20 K over/under temperatures vis-à-vis the zero-field propane-hydrate melting point. Upon e/m-field application, there is a field-frequency threshold above which the dissociation rate drops significantly, with a plateau therein for larger-frequencies. It was found that higher intensity and lower frequency facilitates dissociation. Except in the presence of a thermal driving-force, the 10 GHz frequency shows more substantial rate-enhancement effect vis-à-vis static electric fields or, indeed, lower-frequency e/m fields.
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Affiliation(s)
- Mohammad Reza Ghaani
- School of Chemical and Bioprocess Engineering, University College Dublin, Belfield, Dublin 4, Ireland
| | - Niall J English
- School of Chemical and Bioprocess Engineering, University College Dublin, Belfield, Dublin 4, Ireland
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19
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Sicard F, Bui T, Monteiro D, Lan Q, Ceglio M, Burress C, Striolo A. Emergent Properties of Antiagglomerant Films Control Methane Transport: Implications for Hydrate Management. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:9701-9710. [PMID: 30058809 DOI: 10.1021/acs.langmuir.8b01366] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The relationship between collective properties and performance of antiagglomerants (AAs) used in hydrate management is handled using molecular dynamics simulations and enhanced sampling techniques. A thin film of AAs adsorbed at the interface between one flat sII methane hydrate substrate and a fluid hydrocarbon mixture containing methane and n-dodecane is studied. The AA considered is a surface-active compound with a complex hydrophilic head that contains both amide and tertiary ammonium cation groups and hydrophobic tails. At a sufficiently high AA density, the interplay between the surfactant layer and the liquid hydrocarbon excludes methane from the interfacial region. In this scenario, we combine metadynamics and umbrella sampling frameworks to study accurately the free-energy landscape and the equilibrium rates associated with the transport of one methane molecule across the AA film. We observe that the local configurational changes of the liquid hydrocarbon packed within the AA film are associated with high free-energy barriers for methane transport. The time scales estimated for the transport of methane across the AA film can be, in some cases, comparable to those reported in the literature for the growth of hydrates, suggesting that one possible mechanism by which AAs delay the formation of hydrate plugs could be providing a barrier to methane transport. Considering the interplay between the structural design and collective properties of AAs might be of relevance to improve their performance in flow assurance.
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Affiliation(s)
- François Sicard
- Department of Chemical Engineering , University College London , WC1E 7JE London , U.K
| | - Tai Bui
- Department of Chemical Engineering , University College London , WC1E 7JE London , U.K
| | | | - Qiang Lan
- Halliburton , Houston , 77032 Texas , United States
| | - Mark Ceglio
- Halliburton , Houston , 77032 Texas , United States
| | | | - Alberto Striolo
- Department of Chemical Engineering , University College London , WC1E 7JE London , U.K
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20
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Choudhary N, Hande VR, Roy S, Chakrabarty S, Kumar R. Effect of Sodium Dodecyl Sulfate Surfactant on Methane Hydrate Formation: A Molecular Dynamics Study. J Phys Chem B 2018; 122:6536-6542. [PMID: 29882664 DOI: 10.1021/acs.jpcb.8b02285] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In experimental studies, it has been observed that the presence of sodium dodecyl sulfate (SDS) significantly increases the kinetics of hydrate formation and the final water-to-hydrate conversion ratio. In this study, we intend to understand the molecular mechanism behind the effect of SDS on the formation of methane hydrate through molecular dynamics simulation. Hydrate formation conditions similar to that of laboratory experiments were chosen to study hydrate growth kinetics in 1 wt % SDS solution. We also investigate the effect of interactions with isolated SDS molecules on methane hydrate growth. It was observed that the hydrophobic tail part of the SDS molecule favorably interacts with the growing hydrate surface and may occupy the partial hydrate cages while the head groups remain exposed to water.
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Affiliation(s)
- Nilesh Choudhary
- Academy of Scientific and Innovative Research , Delhi-Mathura Road , New Delhi 110025 , India
| | - Vrushali R Hande
- Academy of Scientific and Innovative Research , Delhi-Mathura Road , New Delhi 110025 , India
| | | | - Suman Chakrabarty
- School of Chemical Sciences, National Institute of Science Education and Research (NISER) Bhubaneswar, HBNI , P.O. Bhimpur-Padanpur 752050 , Odisha , India
| | - Rajnish Kumar
- Department of Chemical Engineering , Indian Institute of Technology-Madras , Chennai 600036 , Tamilnadu , India
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21
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Yagasaki T, Matsumoto M, Tanaka H. Adsorption of Kinetic Hydrate Inhibitors on Growing Surfaces: A Molecular Dynamics Study. J Phys Chem B 2018; 122:3396-3406. [PMID: 29278335 DOI: 10.1021/acs.jpcb.7b10356] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We investigate the mechanism of a typical kinetic hydrate inhibitor (KHI), polyvinylcaprolactam (PVCap), which has been applied to prevent hydrate plugs from forming in gas pipe lines, using molecular dynamics simulations of crystal growth of ethylene oxide hydrate. Water-soluble ethylene oxide is chosen as a guest species to avoid problems associated with the presence of the gas phase in the simulation cell such as slow crystal growth. A PVCap dodecamer adsorbs irreversibly on the hydrate surface which grows at supercooling of 3 K when the hydrophobic part of two pendent groups are trapped in open cages at the surface. The amide hydrogen bonds make no contribution to the adsorption. PVCap can adsorb on various crystallographic planes of sI hydrate. This is in contrast to antifreeze proteins, each of which prefers a specific plane of ice. The trapped PVCap gives rise to necessarily the concave surface of the hydrate. The crystal growth rate decreases with increasing surface curvature, indicating that the inhibition by PVCap is explained by the Gibbs-Thomson effect.
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Affiliation(s)
- Takuma Yagasaki
- Research Institute for Interdisciplinary Science , Okayama University , Okayama 700-8530 , Japan
| | - Masakazu Matsumoto
- Research Institute for Interdisciplinary Science , Okayama University , Okayama 700-8530 , Japan
| | - Hideki Tanaka
- Research Institute for Interdisciplinary Science , Okayama University , Okayama 700-8530 , Japan
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22
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Ghaani MR, English NJ. Molecular-dynamics study of propane-hydrate dissociation: Fluctuation-dissipation and non-equilibrium analysis. J Chem Phys 2018; 148:114504. [PMID: 29566503 DOI: 10.1063/1.5018192] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Equilibrium and non-equilibrium molecular-dynamics (MD) simulations have been performed to investigate thermal-driven break-up of planar propane-hydrate interfaces in contact with liquid water over the 260-320 K range. Two types of hydrate-surface water-lattice molecular termination were adopted, at the hydrate edge with water, for comparison: a 001-direct surface cleavage and one with completed cages. Statistically significant differences in melting temperatures and initial break-up rates were observed between both interface types. Dissociation rates were observed to be strongly dependent on temperature, with higher rates at larger over-temperatures vis-à-vis melting. A simple coupled mass and heat transfer model, developed previously, was applied to fit the observed dissociation profiles, and this helps us to identify clearly two distinct hydrate-decomposition régimes; following a highly temperature-dependent break-up phase, a second well-defined stage is essentially independent of temperature, in which the remaining nanoscale, de facto two-dimensional system's lattice framework is intrinsically unstable. Further equilibrium MD-analysis of the two-phase systems at their melting point, with consideration of the relaxation times gleaned from the auto-correlation functions of fluctuations in a number of enclathrated guest molecules, led to statistically significant differences between the two surface-termination cases; a consistent correlation emerged in both cases between the underlying, non-equilibrium, thermal-driven dissociation rates sampled directly from melting with that from an equilibrium-MD fluctuation-dissipation approach.
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Affiliation(s)
- Mohammad Reza Ghaani
- School of Chemical and Bioprocess Engineering, University College Dublin, Belfield, Dublin 4, Ireland
| | - Niall J English
- School of Chemical and Bioprocess Engineering, University College Dublin, Belfield, Dublin 4, Ireland
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23
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Different Mechanism Effect between Gas-Solid and Liquid-Solid Interface on the Three-Phase Coexistence Hydrate System Dissociation in Seawater: A Molecular Dynamics Simulation Study. ENERGIES 2017. [DOI: 10.3390/en11010006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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24
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Kim K, Kim Y, Yang J, Ha KS, Usta H, Lee J, Kim C. Enhanced mass transfer rate and solubility of methane via addition of alcohols for Methylosinus trichosporium OB3b fermentation. J IND ENG CHEM 2017. [DOI: 10.1016/j.jiec.2016.11.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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25
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Liu L, Mao S, Li Q, Wang X, Yang M, Li L. Confinement of hydrogen and hydroxyl radicals in water cages: a density functional theory study. RSC Adv 2017. [DOI: 10.1039/c6ra28804a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Radicals can be confined in water cages and exhibit similar structures and properties to their corresponding free forms.
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Affiliation(s)
- Liuxie Liu
- College of Chemistry and Materials Science
- Sichuan Normal University
- Chengdu 610068
- China
| | - Shuang Mao
- College of Chemistry and Materials Science
- Sichuan Normal University
- Chengdu 610068
- China
| | - Quan Li
- College of Chemistry and Materials Science
- Sichuan Normal University
- Chengdu 610068
- China
| | - Xiaolan Wang
- College of Chemistry and Materials Science
- Sichuan Normal University
- Chengdu 610068
- China
| | - Mingli Yang
- Institute of Atomic and Molecular Physics
- Sichuan University
- Chengdu 610065
- China
| | - Laicai Li
- College of Chemistry and Materials Science
- Sichuan Normal University
- Chengdu 610068
- China
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26
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Sujith KS, Ramachandran CN. Natural Gas Evolution in a Gas Hydrate Melt: Effect of Thermodynamic Hydrate Inhibitors. J Phys Chem B 2016; 121:153-163. [DOI: 10.1021/acs.jpcb.6b07782] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- K. S. Sujith
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India
| | - C. N. Ramachandran
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India
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27
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Yan KF, Li XS, Chen ZY, Xia ZM, Xu CG, Zhang Z. Molecular Dynamics Simulation of the Crystal Nucleation and Growth Behavior of Methane Hydrate in the Presence of the Surface and Nanopores of Porous Sediment. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:7975-7984. [PMID: 27398713 DOI: 10.1021/acs.langmuir.6b01601] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The behavior of hydrate formation in porous sediment has been widely studied because of its importance in the investigation of reservoirs and in the drilling of natural gas hydrate. However, it is difficult to understand the hydrate nucleation and growth mechanism on the surface and in the nanopores of porous media by experimental and numerical simulation methods. In this work, molecular dynamics simulations of the nucleation and growth of CH4 hydrate in the presence of the surface and nanopores of clay are carried out. The molecular configurations and microstructure properties are analyzed for systems containing one H2O hydrate layer (System A), three H2O hydrate layers (System B), and six H2O hydrate layers (System C) in both clay and the bulk solution. It is found that hydrate formation is more complex in porous media than in the pure bulk solution and that there is cooperativity between hydrate growth and molecular diffusion in clay nanopores. The hydroxylated edge sites of the clay surface could serve as a source of CH4 molecules to facilitate hydrate nucleation. The diffusion velocity of molecules is influenced by the growth of the hydrate that forms a block in the throats of the clay nanopore. Comparing hydrate growth in different clay pore sizes reveals that the pore size plays an important role in hydrate growth and molecular diffusion in clay. This simulation study provides the microscopic mechanism of hydrate nucleation and growth in porous media, which can be favorable for the investigation of the formation of natural gas hydrate in sediments.
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Affiliation(s)
- Ke-Feng Yan
- Key Laboratory of Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences , Guangzhou 510640, China
- Guangdong Key Laboratory of New and Renewable Energy Research and Development , Guangzhou 510640, China
| | - Xiao-Sen Li
- Key Laboratory of Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences , Guangzhou 510640, China
- Guangdong Key Laboratory of New and Renewable Energy Research and Development , Guangzhou 510640, China
| | - Zhao-Yang Chen
- Key Laboratory of Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences , Guangzhou 510640, China
- Guangdong Key Laboratory of New and Renewable Energy Research and Development , Guangzhou 510640, China
| | - Zhi-Ming Xia
- Key Laboratory of Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences , Guangzhou 510640, China
- Guangdong Key Laboratory of New and Renewable Energy Research and Development , Guangzhou 510640, China
| | - Chun-Gang Xu
- Key Laboratory of Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences , Guangzhou 510640, China
- Guangdong Key Laboratory of New and Renewable Energy Research and Development , Guangzhou 510640, China
| | - Zhiqiang Zhang
- College of Mining Engineering, Taiyuan University of Technology , Taiyuan 030024, China
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28
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Sun T, Davies PL, Walker VK. Structural Basis for the Inhibition of Gas Hydrates by α-Helical Antifreeze Proteins. Biophys J 2016; 109:1698-705. [PMID: 26488661 DOI: 10.1016/j.bpj.2015.08.041] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2015] [Revised: 08/10/2015] [Accepted: 08/31/2015] [Indexed: 10/22/2022] Open
Abstract
Kinetic hydrate inhibitors (KHIs) are used commercially to inhibit gas hydrate formation and growth in pipelines. However, improvement of these polymers has been constrained by the lack of verified molecular models. Since antifreeze proteins (AFPs) act as KHIs, we have used their solved x-ray crystallographic structures in molecular modeling to explore gas hydrate inhibition. The internal clathrate water network of the fish AFP Maxi, which extends to the protein's outer surface, is remarkably similar to the {100} planes of structure type II (sII) gas hydrate. The crystal structure of this water web has facilitated the construction of in silico models for Maxi and type I AFP binding to sII hydrates. Here, we have substantiated our models with experimental evidence of Maxi binding to the tetrahydrofuran sII model hydrate. Both in silico and experimental evidence support the absorbance-inhibition mechanism proposed for KHI binding to gas hydrates. Based on the Maxi crystal structure we suggest that the inhibitor adsorbs to the gas hydrate lattice through the same anchored clathrate water mechanism used to bind ice. These results will facilitate the rational design of a next generation of effective green KHIs for the petroleum industry to ensure safe and efficient hydrocarbon flow.
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Affiliation(s)
- Tianjun Sun
- Department of Biomedical and Molecular Sciences, Queen's University, Kingston, Ontario, Canada
| | - Peter L Davies
- Department of Biomedical and Molecular Sciences, Queen's University, Kingston, Ontario, Canada; Department of Biology, Queen's University, Kingston, Ontario, Canada
| | - Virginia K Walker
- Department of Biomedical and Molecular Sciences, Queen's University, Kingston, Ontario, Canada; Department of Biology, Queen's University, Kingston, Ontario, Canada.
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29
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Yagasaki T, Matsumoto M, Tanaka H. Effects of thermodynamic inhibitors on the dissociation of methane hydrate: a molecular dynamics study. Phys Chem Chem Phys 2015; 17:32347-57. [PMID: 26587576 DOI: 10.1039/c5cp03008k] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We investigate the effects of methanol and NaCl, which are known as thermodynamic hydrate inhibitors, on the dissociation kinetics of methane hydrate in aqueous solutions by using molecular dynamics simulations. It is shown that the dissociation rate is not constant but changes with time. The dissociation rate in the initial stage is increased by methanol whereas it is decreased by NaCl. This difference arises from the opposite effects of the two thermodynamic inhibitors on the hydration free energy of methane. The dissociation rate of methane hydrate is increased by the formation of methane bubbles in the aqueous phase because the bubbles absorb surrounding methane molecules. It is found that both methanol and NaCl facilitate the bubble formation. However, their mechanisms are completely different from each other. The presence of ions enhances the hydrophobic interactions between methane molecules. In addition, the ions in the solution cause a highly non-uniform distribution of dissolved methane molecules. These two effects result in the easy formation of bubbles in the NaCl solution. In contrast, methanol assists the bubble formation because of its amphiphilic character.
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Affiliation(s)
- Takuma Yagasaki
- Department of Chemistry, Faculty of Science, Okayama University, Okayama, 700-8530, Japan
| | - Masakazu Matsumoto
- Department of Chemistry, Faculty of Science, Okayama University, Okayama, 700-8530, Japan
| | - Hideki Tanaka
- Department of Chemistry, Faculty of Science, Okayama University, Okayama, 700-8530, Japan and Research Center of New Functional Materials for Energy Production, Storage and Transport, Okayama, 700-8530, Japan.
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30
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Yagasaki T, Matsumoto M, Tanaka H. Adsorption Mechanism of Inhibitor and Guest Molecules on the Surface of Gas Hydrates. J Am Chem Soc 2015; 137:12079-85. [DOI: 10.1021/jacs.5b07417] [Citation(s) in RCA: 104] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Takuma Yagasaki
- Department
of Chemistry, Faculty of Science, Okayama University, Okayama, 700-8530, Japan
| | - Masakazu Matsumoto
- Department
of Chemistry, Faculty of Science, Okayama University, Okayama, 700-8530, Japan
| | - Hideki Tanaka
- Department
of Chemistry, Faculty of Science, Okayama University, Okayama, 700-8530, Japan
- Research Center of New Functional Materials for Energy Production, Storage and Transport, Okayama, 700-8530, Japan
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31
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Abstract
Understanding the nucleation and crystal growth of gas hydrates near mineral surfaces and in confinement are critical to the methane recovery from gas hydrate reservoirs. In this work, through molecular dynamics simulation studies, we present an exploration of the nucleation behavior of methane hydrates near model hydroxylated silica surfaces. Our simulation results indicate that the nucleation of methane hydrates can initiate from the silica surfaces despite of the structural mismatch of the two solid phases. A layer of intermediate half-cage structures was observed between the gas hydrate and silica surfaces, apparently helping to minimize the free energy penalty. These results have important implications to our understanding of the effects of solid surfaces on hydrate nucleation processes.
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Affiliation(s)
- Shuai Liang
- Key Laboratory of Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, China
| | - Peter G. Kusalik
- Department of Chemistry, University of Calgary, Calgary, Alberta, Canada
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32
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Lauricella M, Meloni S, Liang S, English NJ, Kusalik PG, Ciccotti G. Clathrate structure-type recognition: Application to hydrate nucleation and crystallisation. J Chem Phys 2015; 142:244503. [DOI: 10.1063/1.4922696] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Affiliation(s)
- Marco Lauricella
- School of Physics, University College Dublin, Belfield, Dublin 4, Ireland
- Instituto per le Applicazioni del Calcolo, Consiglio Nazionale delle Ricerche, Rome, Italy
| | - Simone Meloni
- School of Physics, University College Dublin, Belfield, Dublin 4, Ireland
- Laboratory of Computational Chemistry and Biochemistry, École Polytechnique Fedérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - Shuai Liang
- Deptartment of Chemistry, University of Calgary, Calgary, Alberta T2N 1N4, Canada
- Key Laboratory of Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, China
| | - Niall J. English
- School of Chemical and Bioprocess Engineering, University College Dublin, Belfield, Dublin 4, Ireland
| | - Peter G. Kusalik
- Deptartment of Chemistry, University of Calgary, Calgary, Alberta T2N 1N4, Canada
| | - Giovanni Ciccotti
- School of Physics, University College Dublin, Belfield, Dublin 4, Ireland
- Dipartimento di Fisica and CNISM, Università La Sapienza, P. le A. Moro 5, 00185 Rome, Italy
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33
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Bagherzadeh SA, Alavi S, Ripmeester J, Englezos P. Formation of methane nano-bubbles during hydrate decomposition and their effect on hydrate growth. J Chem Phys 2015; 142:214701. [DOI: 10.1063/1.4920971] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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34
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Míguez JM, Conde MM, Torré JP, Blas FJ, Piñeiro MM, Vega C. Molecular dynamics simulation of CO2hydrates: Prediction of three phase coexistence line. J Chem Phys 2015; 142:124505. [DOI: 10.1063/1.4916119] [Citation(s) in RCA: 65] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- J. M. Míguez
- Laboratoire des Fluides Complexes et leurs Réservoirs, UMR 5150, Université de Pau et des Pays de l’Adour, B. P. 1155, Pau-Cedex 64013, France
| | - M. M. Conde
- Laboratoire des Fluides Complexes et leurs Réservoirs, UMR 5150, Université de Pau et des Pays de l’Adour, B. P. 1155, Pau-Cedex 64013, France
| | - J.-P. Torré
- Laboratoire des Fluides Complexes et leurs Réservoirs, UMR 5150, Université de Pau et des Pays de l’Adour, B. P. 1155, Pau-Cedex 64013, France
| | - F. J. Blas
- Departamento de Física Aplicada, Facultad de Ciencias Experimentales, and Centro de Física Teórica y Matemática FIMAT, Universidad de Huelva, 21071 Huelva, Spain
| | - M. M. Piñeiro
- Departamento de Física Aplicada, Facultade de Ciencias, Universidade de Vigo, E36310 Vigo, Spain
| | - C. Vega
- Departamento de Química-Física I, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, E28040 Madrid, Spain
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35
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Das S, Baghel VS, Roy S, Kumar R. A molecular dynamics study of model SI clathrate hydrates: the effect of guest size and guest–water interaction on decomposition kinetics. Phys Chem Chem Phys 2015; 17:9509-18. [PMID: 25767053 DOI: 10.1039/c5cp00678c] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
One of the options suggested for methane recovery from natural gas hydrates is molecular replacement of methane by suitable guests like CO2 and N2.
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Affiliation(s)
- Subhadip Das
- Physical Chemistry Division
- National Chemical Laboratory
- Pune-411008
- India
| | - Vikesh Singh Baghel
- Chemical Engineering and Process Development
- National Chemical Laboratory
- Pune-411008
- India
| | - Sudip Roy
- Physical Chemistry Division
- National Chemical Laboratory
- Pune-411008
- India
| | - Rajnish Kumar
- Chemical Engineering and Process Development
- National Chemical Laboratory
- Pune-411008
- India
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36
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Perspectives on molecular simulation of clathrate hydrates: Progress, prospects and challenges. Chem Eng Sci 2015. [DOI: 10.1016/j.ces.2014.07.047] [Citation(s) in RCA: 144] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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37
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English NJ. Massively parallel molecular-dynamics simulation of ice crystallisation and melting: The roles of system size, ensemble, and electrostatics. J Chem Phys 2014; 141:234501. [DOI: 10.1063/1.4903786] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
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38
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Yagasaki T, Matsumoto M, Andoh Y, Okazaki S, Tanaka H. Dissociation of Methane Hydrate in Aqueous NaCl Solutions. J Phys Chem B 2014; 118:11797-804. [DOI: 10.1021/jp507978u] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Takuma Yagasaki
- Department
of Chemistry, Faculty of Science, Okayama University, Okayama 700-8530, Japan
| | - Masakazu Matsumoto
- Department
of Chemistry, Faculty of Science, Okayama University, Okayama 700-8530, Japan
| | - Yoshimichi Andoh
- Department
of Applied Chemistry, Nagoya University, Nagoya 464-8603, Japan
| | - Susumu Okazaki
- Department
of Applied Chemistry, Nagoya University, Nagoya 464-8603, Japan
| | - Hideki Tanaka
- Department
of Chemistry, Faculty of Science, Okayama University, Okayama 700-8530, Japan
- Research Center
of New Functional Materials for Energy Production, Storage and Transport, Okayama 700-8530, Japan
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39
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Yi L, Liang D, Zhou X, Li D, Wang J. Molecular dynamics simulations of carbon dioxide hydrate growth in electrolyte solutions of NaCl and MgCl2. Mol Phys 2014. [DOI: 10.1080/00268976.2014.932454] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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40
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Molecular dynamics simulation of the intercalation behaviors of methane hydrate in montmorillonite. J Mol Model 2014; 20:2311. [PMID: 24906646 DOI: 10.1007/s00894-014-2311-8] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2014] [Accepted: 05/19/2014] [Indexed: 10/25/2022]
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41
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English NJ, Lauricella M, Meloni S. Massively parallel molecular dynamics simulation of formation of clathrate-hydrate precursors at planar water-methane interfaces: Insights into heterogeneous nucleation. J Chem Phys 2014; 140:204714. [DOI: 10.1063/1.4879777] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
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42
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Nguyen AH, Molinero V. Cross-nucleation between clathrate hydrate polymorphs: Assessing the role of stability, growth rate, and structure matching. J Chem Phys 2014; 140:084506. [DOI: 10.1063/1.4866143] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
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43
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Yagasaki T, Matsumoto M, Andoh Y, Okazaki S, Tanaka H. Effect of Bubble Formation on the Dissociation of Methane Hydrate in Water: A Molecular Dynamics Study. J Phys Chem B 2014; 118:1900-6. [DOI: 10.1021/jp412692d] [Citation(s) in RCA: 84] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Takuma Yagasaki
- Department
of Chemistry, Faculty of Science, Okayama University, Okayama, 700-8530, Japan
| | - Masakazu Matsumoto
- Department
of Chemistry, Faculty of Science, Okayama University, Okayama, 700-8530, Japan
| | - Yoshimichi Andoh
- Department
of Applied Chemistry, Nagoya University, Nagoya 464-8603, Japan
| | - Susumu Okazaki
- Department
of Applied Chemistry, Nagoya University, Nagoya 464-8603, Japan
| | - Hideki Tanaka
- Department
of Chemistry, Faculty of Science, Okayama University, Okayama, 700-8530, Japan
- Research Center
of New Functional Materials for Energy Production, Storage and Transport, Okayama, 700-8530, Japan
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44
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Rozmanov D, Baoukina S, Tieleman DP. Density based visualization for molecular simulation. Faraday Discuss 2014; 169:225-43. [DOI: 10.1039/c3fd00124e] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Molecular visualization of structural information obtained from computer simulations is an important part of research work flow. A good visualization technique should be capable of eliminating redundant information and highlight important effects clarifying the key phenomena in the system. Current methods of presenting structural data are mostly limited to variants of the traditional ball-and-stick representation. This approach becomes less attractive when very large biological systems are simulated at microsecond timescales, and is less effective when coarse-grained models are used. Real time rendering of such large systems becomes a difficult task; the amount of information in one single frame of a simulation trajectory is enormous given the large number of particles; at the same time, each structure contains information about one configurational point of the system and no information about statistical weight of this specific configuration. In this paper we report a novel visualization technique based on spatial particle densities. The atomic densities are sampled on a high resolution 3-dimensional grid along a relatively short molecular dynamics trajectory using hundreds of configurations. The density information is then analyzed and visualized using the open-source ParaView software. The performance and capability of the method are demonstrated on two large systems simulated with the MARTINI coarse-grained force field: a lipid nanoparticle for delivering siRNA molecules and monolayers with a complex composition under conditions that induce monolayer collapse.
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Affiliation(s)
- Dmitri Rozmanov
- Department of Biological Sciences and Centre for Molecular Simulation
- University of Calgary
- Calgary, Canada
| | - Svetlana Baoukina
- Department of Biological Sciences and Centre for Molecular Simulation
- University of Calgary
- Calgary, Canada
| | - D. Peter Tieleman
- Department of Biological Sciences and Centre for Molecular Simulation
- University of Calgary
- Calgary, Canada
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45
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Conde MM, Gonzalez MA, Abascal JLF, Vega C. Determining the phase diagram of water from direct coexistence simulations: The phase diagram of the TIP4P/2005 model revisited. J Chem Phys 2013; 139:154505. [DOI: 10.1063/1.4824627] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
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46
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English NJ, Clarke ET. Molecular dynamics study of CO2 hydrate dissociation: Fluctuation-dissipation and non-equilibrium analysis. J Chem Phys 2013; 139:094701. [DOI: 10.1063/1.4819269] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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47
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Conde MM, Vega C. Note: A simple correlation to locate the three phase coexistence line in methane-hydrate simulations. J Chem Phys 2013; 138:056101. [DOI: 10.1063/1.4790647] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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48
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Liang S, Kusalik PG. Nucleation of gas hydrates within constant energy systems. J Phys Chem B 2013; 117:1403-10. [PMID: 23330680 DOI: 10.1021/jp308395x] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The early stage of formation of gas hydrates has recently attracted attention as amorphous intermediate gas hydrate structures have been observed, apparently contrary to a classical model of nucleation and some experimental observations. To date, essentially all reported molecular simulations of the nucleation of gas hydrates have been under constant temperature conditions, which does not consider the possible impacts of heat transfer on the nucleation processes. Here we show, using constant energy molecular simulations, that the nuclei at an early stage of the hydrate formation have relatively more crystalline order in comparison with those observed in previous isothermal (NPT or NVT) work. The current work suggests a more transient role for intermediate amorphous structures during hydrate nucleation, thereby providing a stronger link between molecular simulation and experimental observations. Our NVE results nevertheless support the two-step nucleation mechanism proposed in previous simulation studies under constant temperature conditions which features the initial formation of amorphous hydrate-like structures.
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Affiliation(s)
- Shuai Liang
- Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada T2N 1N4
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49
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Tung YT, Chen LJ, Chen YP, Lin ST. Molecular Dynamics Study on the Growth of Structure I Methane Hydrate in Aqueous Solution of Sodium Chloride. J Phys Chem B 2012; 116:14115-25. [DOI: 10.1021/jp308224v] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yen-Tien Tung
- Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan
| | - Li-Jen Chen
- Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan
| | - Yan-Ping Chen
- Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan
| | - Shiang-Tai Lin
- Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan
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50
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The Wolf method applied to the type I methane and carbon dioxide gas hydrates. J Mol Graph Model 2012; 38:455-64. [DOI: 10.1016/j.jmgm.2012.10.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2012] [Revised: 09/29/2012] [Accepted: 10/05/2012] [Indexed: 11/23/2022]
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