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Futera Z, English NJ. Dielectric properties of ice VII under the influence of time-alternating external electric fields. Phys Chem Chem Phys 2021; 24:56-62. [PMID: 34698743 DOI: 10.1039/d1cp04165g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The high-pressure solid phase of water known as ice VII has recently attracted a lot of attention when its presence was detected in large exoplanets, their icy satellites, and even in Earth's mantle. Moreover, a transition of ice VII to the superionic phase can be triggered by external electric fields. Here, we investigate the dielectric responses of ice VII to applied oscillating electric fields of various frequencies employing non-equilibrium ab initio molecular dynamics. We focus on the dynamical properties of a dipole-ordered ice VII structure, for which we explored external-field-induced electronic polarisation and the vibrational spectral density of states (VDOS). These analyses are important for the understanding of collective motions in the ice-VII lattice and the electronic properties of this exotic water phase.
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Affiliation(s)
- Zdenek Futera
- Faculty of Science, University of South Bohemia, Branisovska 1760, 370 05 Ceske Budejovice, Czech Republic.
| | - Niall J English
- School of Chemical and Bioprocess Engineering, University College Dublin, Belfield, Dublin 4, Ireland.
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2
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English NJ. Electric-field-promoted photo-electrochemical production of hydrogen from water splitting. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.116949] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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3
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Futera Z, English NJ. Water Breakup at Fe 2O 3-Hematite/Water Interfaces: Influence of External Electric Fields from Nonequilibrium Ab Initio Molecular Dynamics. J Phys Chem Lett 2021; 12:6818-6826. [PMID: 34270253 PMCID: PMC8397349 DOI: 10.1021/acs.jpclett.1c01479] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2021] [Accepted: 07/07/2021] [Indexed: 05/25/2023]
Abstract
The dynamical properties of physically and chemically adsorbed water molecules at pristine hematite-(001) surfaces have been studied by means of nonequilibrium ab initio molecular dynamics (NE-AIMD) in the NVT ensemble at room temperature, in the presence of externally applied, uniform static electric fields of increasing intensity. The dissociation of water molecules to form chemically adsorbed species was scrutinized, in addition to charge redistribution and Grotthus proton hopping between water molecules. Dynamical properties of the adsorbed water molecules and OH- and H3O+ ions were gauged, such as the hydrogen bonds between protons in water molecules and the bridging oxygen atoms at the hematite surface, as well as the interactions between oxygen atoms in adsorbed water molecules and iron atoms at the hematite surface. The development of Helmholtz charge layers via water breakup at Fe2O3-hematite/water interfaces is also an interesting feature, with the development of protonic conduction on the surface and more bulk-like water.
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Affiliation(s)
- Zdenek Futera
- Faculty
of Science, University of South Bohemia, Branisovska 1760, 370 05 Ceske Budejovice, Czech Republic
| | - Niall J. English
- School
of Chemical and Bioprocess Engineering, University College Dublin, Belfield, Dublin 4, Ireland
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4
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Abbaspour M, Akbarzadeh H, Salemi S, Bahmanipour L. Structure, dynamics, and morphology of nanostructured water confined between parallel graphene surfaces and in carbon nanotubes by applying magnetic and electric fields. SOFT MATTER 2021; 17:3085-3095. [PMID: 33596282 DOI: 10.1039/d0sm01677b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Water molecules experience certain changes in their properties when they feel an external magnetic or electric field. These changes are significant in different applications, such as biological and biotechnological processes, nano-pumping, and water treatment. In this work, we have performed molecular dynamics (MD) simulations to investigate the different thermodynamics, structure, and dynamics of water molecules confined between two parallel surfaces and also confined in carbon nanotubes (CNTs). We have also applied different electric and magnetic fields in different directions to the confined molecules. In the graphene system, no polygonal shape was formed in either low or high electric fields, whereas rhombic and pentagonal shapes were formed in low and high magnetic fields. In the CNT system, applying electric fields in all three dimensions made the pentagonal shape disappear and the confined water molecules formed a ring shape when the electric field was applied in the axial direction. Applying the electric field perpendicular to the graphene surfaces increases the self-diffusion of the confined molecules, whereas applying the electric and magnetic fields along the CNT axis decreases the self-diffusion of the confined water molecules. In the graphene system, applying the electric field perpendicular to the graphene surfaces decreases the average number of hydrogen bonds (〈HB〉) whereas the magnetic field has little effect on the 〈HB〉. In the CNT system, applying Ex also leads to a smaller number of HBs. Also, applying the magnetic field along the x-direction (along the CNT direction) leads to a greater number of HBs than the other fields.
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Affiliation(s)
- Mohsen Abbaspour
- Department of Chemistry, Hakim Sabzevari University, Sabzevar, Iran.
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5
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O’Connor D, English NJ. Systematic Design-of-Experiments, factorial-design approaches for tuning simple empirical water models. MOLECULAR SIMULATION 2021. [DOI: 10.1080/08927022.2019.1626987] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Diarmuid O’Connor
- 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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6
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Abbaspour M, Akbarzadeh H, Zaeifi S. Thermodynamics, Structure, and Dynamic Properties of Nanostructured Water Confined into B-, N-, and Si-Doped Graphene Surfaces and Carbon Nanotubes. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.0c00119] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mohsen Abbaspour
- Department of Chemistry, Hakim Sabzevari University, 96179-76487 Sabzevar, Iran
| | - Hamed Akbarzadeh
- Department of Chemistry, Hakim Sabzevari University, 96179-76487 Sabzevar, Iran
| | - Shadi Zaeifi
- Department of Chemistry, Hakim Sabzevari University, 96179-76487 Sabzevar, Iran
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7
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Futera Z, Tse JS, English NJ. Possibility of realizing superionic ice VII in external electric fields of planetary bodies. SCIENCE ADVANCES 2020; 6:eaaz2915. [PMID: 32494738 PMCID: PMC7244312 DOI: 10.1126/sciadv.aaz2915] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2019] [Accepted: 03/18/2020] [Indexed: 05/31/2023]
Abstract
In a superionic (SI) ice phase, oxygen atoms remain crystallographically ordered while protons become fully diffusive as a result of intramolecular dissociation. Ice VII's importance as a potential candidate for a SI ice phase has been conjectured from anomalous proton diffusivity data. Theoretical studies indicate possible SI prevalence in large-planet mantles (e.g., Uranus and Neptune) and exoplanets. Here, we realize sustainable SI behavior in ice VII by means of externally applied electric fields, using state-of-the-art nonequilibrium ab initio molecular dynamics to witness at first hand the protons' fluid dance through a dipole-ordered ice VII lattice. We point out the possibility of SI ice VII on Venus, in its strong permanent electric field.
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Affiliation(s)
- Zdenek Futera
- Faculty of Science, University of South Bohemia, Branisovska 1760, Ceske Budejovice 370 05, Czech Republic
| | - John S. Tse
- Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E2, Canada
| | - Niall J. English
- School of Chemical and Bioprocess Engineering, University College Dublin, Belfield, Dublin 4, Ireland
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Futera Z, English NJ. Pressure dependence of structural properties of ice VII: An ab initio molecular-dynamics study. J Chem Phys 2018; 148:204505. [DOI: 10.1063/1.5022175] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Zdenek Futera
- School of Chemical and Bioprocess Engineering, University College Dublin, Belfield, Dublin 4, Ireland
- Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom
| | - Niall J. English
- School of Chemical and Bioprocess Engineering, University College Dublin, Belfield, Dublin 4, Ireland
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Burnham CJ, Futera Z, English NJ. Study of hydrogen-molecule guests in type II clathrate hydrates using a force-matched potential model parameterised from ab initio molecular dynamics. J Chem Phys 2018; 148:102323. [DOI: 10.1063/1.4999909] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Christian J. Burnham
- School of Chemical and Bioprocess Engineering, University College Dublin, Belfield, Dublin 4, Ireland
| | - Zdenek Futera
- 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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10
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Abbaspour M, Akbarzadeh H, Salemi S, Jalalitalab E. Density-dependent phase transition in nano-confinement water using molecular dynamics simulation. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2017.11.162] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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11
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Jalalitalab E, Abbaspour M, Akbarzadeh H. Thermodynamic, structural, and dynamical properties of nano-confined water using SPC/E and TIP4P models by molecular dynamics simulations. NEW J CHEM 2018. [DOI: 10.1039/c8nj01185k] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Different morphologies of water molecules are confined between two parallel graphene surfaces.
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12
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da Silva GCQ, Cardozo TM, Amarante GW, Abreu CRA, Horta BAC. Solvent effects on the decarboxylation of trichloroacetic acid: insights from ab initio molecular dynamics simulations. Phys Chem Chem Phys 2018; 20:21988-21998. [DOI: 10.1039/c8cp02455c] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
The kinetics of trichloroacetic acid (TCA) decarboxylation strongly depends on the solvent in which it occurs, proceeding faster in polar aprotic solvents compared to protic solvents.
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Affiliation(s)
| | - Thiago M. Cardozo
- Instituto de Química
- Universidade Federal do Rio de Janeiro
- Salas 408 e 609
- Brazil
| | | | | | - Bruno A. C. Horta
- Instituto de Química
- Universidade Federal do Rio de Janeiro
- Salas 408 e 609
- Brazil
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13
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Yong X, Tse JS, English NJ. optPBE-vdW density functional theory study of liquid water and pressure-induced structural evolution in ice Ih. CAN J CHEM 2017. [DOI: 10.1139/cjc-2017-0201] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The accuracy of several local and non-local van der Waals (vdW) corrected exchange correlation functionals on the description of the effect of pressure on ice has been investigated. In a preliminary survey, the non-local vdW correction used in conjunction with the optPBE functional was shown to provide the best overall agreement on the structural parameters of ice Ih with experiments. More importantly, this combination reproduced correctly the recently observed crystal → crystal transformation in ice Ih at 80 K prior to amorphisation. The predicted transition pressure of 1.9 GPa is somewhat higher, showing that the current generation of vdW functionals are still not sufficiently accurate for the ice system. The existence of an intermediate crystalline state with a shear-hexagonal structure confirms the earlier prediction that the collapse of crystalline structure under compression originates from the softening of phonon modes in ice Ih’s basal plane.
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Affiliation(s)
- Xue Yong
- Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, SK S7N 5E2, Canada
| | - John S. Tse
- Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, SK S7N 5E2, Canada
| | - Niall J. English
- School of Chemical and Bioprocess Engineering, University College Dublin, Belfield, Dublin 4, Ireland
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14
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Futera Z, English NJ. Communication: Influence of external static and alternating electric fields on water from long-time non-equilibrium ab initio molecular dynamics. J Chem Phys 2017; 147:031102. [DOI: 10.1063/1.4994694] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Affiliation(s)
- Zdenek Futera
- 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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15
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Burnham CJ, Futera Z, English NJ. Quantum and classical inter-cage hopping of hydrogen molecules in clathrate hydrate: temperature and cage-occupation effects. Phys Chem Chem Phys 2017; 19:717-728. [DOI: 10.1039/c6cp06531g] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The free-energy barriers for hydrogen hopping between clathrate-hydrate cavities were evaluated at 50–200 K. Nuclear quantum effects are significant.
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Affiliation(s)
- Christian J. Burnham
- School of Chemical and Bioprocess Engineering
- University College Dublin
- Belfield
- Ireland
| | - Zdenek Futera
- School of Chemical and Bioprocess Engineering
- University College Dublin
- Belfield
- Ireland
| | - Niall J. English
- School of Chemical and Bioprocess Engineering
- University College Dublin
- Belfield
- Ireland
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16
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Burnham CJ, English NJ. Study of clathrate hydrates via equilibrium molecular-dynamics simulation employing polarisable and non-polarisable, rigid and flexible water models. J Chem Phys 2016; 144:164503. [PMID: 27131553 DOI: 10.1063/1.4947039] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Christian J. Burnham
- 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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17
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Skarmoutsos I, Masia M, Guardia E. Structural and dipolar fluctuations in liquid water: A Car–Parrinello molecular dynamics study. Chem Phys Lett 2016. [DOI: 10.1016/j.cplett.2016.02.008] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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