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Serwatka T, Roy PN. Ground states of planar dipolar rotor chains with recurrent neural networks. J Chem Phys 2024; 160:224103. [PMID: 38856054 DOI: 10.1063/5.0205466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2024] [Accepted: 05/27/2024] [Indexed: 06/11/2024] Open
Abstract
In this contribution, we employ a recurrent neural network (RNN) architecture in a variational optimization to obtain the ground state of linear chains of planar, dipolar rotors. We test different local basis sets and discuss their impact on the sign structure of the many-body ground state wavefunction. It is demonstrated that the RNN ansatz we employ is able to treat systems with and without a sign problem in the ground state. For larger chains with up to 50 rotors, accurate properties, such as correlation functions and Binder parameters, are calculated. By employing quantum annealing, we show that precise entanglement properties can be obtained. All these properties allow one to identify a quantum phase transition between a paraelectric and a ferroelectric quantum phase.
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Affiliation(s)
- Tobias Serwatka
- Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - Pierre-Nicholas Roy
- Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
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2
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Orr L, Roy PN. Operator Formulation of Feynman Path Centroid Dynamics for Rotations. J Phys Chem A 2024; 128:3419-3433. [PMID: 38651978 DOI: 10.1021/acs.jpca.3c08201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/25/2024]
Abstract
An operator formulation of centroid molecular dynamics (CMD) for rotational degrees of freedom is presented. The quasi-density operator concept was introduced by Jang and Voth [J. Chem. Phys 111, 2357 (1999)] and is used to obtain a phase-space mapping without the need for discretized path integrals. The approach allows the calculation of approximate Kubo-transformed time correlation functions. The particle on a ring is chosen as an illustrative example. Numerical results demonstrate that the proposed approach leads to accurate results when compared with exact diagonalization calculations for linear operators. At very low temperatures, it is found that rotational CMD yields results that are in exact agreement with the quantum dynamics of a spin-1 system.
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Affiliation(s)
- Lindsay Orr
- Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - Pierre-Nicholas Roy
- Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
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3
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Serwatka T, Roy PN. Quantum criticality in chains of planar rotors with dipolar interactions. J Chem Phys 2024; 160:104302. [PMID: 38465677 DOI: 10.1063/5.0195453] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2024] [Accepted: 02/22/2024] [Indexed: 03/12/2024] Open
Abstract
In this work, we perform a density matrix renormalization group study of chains of planar rotors interacting via dipolar interactions. By exploring the ground state from weakly to strongly interacting rotors, we find the occurrence of a quantum phase transition between a disordered and a dipole-ordered quantum state. We show that the nature of the ordered state changes from ferroelectric to antiferroelectric when the relative orientation of the rotor planes varies and that this change requires no modification of the overall symmetry. The observed quantum phase transitions are characterized by critical exponents and central charges, which reveal different universality classes ranging from that of the (1 + 1)D Ising model to the 2D classical XY model.
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Affiliation(s)
- Tobias Serwatka
- Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - Pierre-Nicholas Roy
- Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
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4
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Yang X, Zhang D, Liu R, Wang L, Liu JY, Wang Z. Rapid Thalidomide Racemization Is Related to Proton Tunneling Reactions via Water Bridges. J Phys Chem Lett 2023; 14:10592-10598. [PMID: 37976462 DOI: 10.1021/acs.jpclett.3c02757] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2023]
Abstract
Quantum mechanical tunneling (QMT) can play an important role in light element-related chemical reactions; however, its influence on racemization is not fully understood. Herein, we demonstrate that the role of QMT is decisive for rapid racemization of the well-known thalidomide molecule in aqueous environments, increasing the reaction rate constants of the most likely racemization pathways by 87-149 times at approximately body temperature and achieving good agreement between theoretical calculations and experimental observations. In addition, the kinetic isotope effect values fit well with those of previous experiments. These results are attributed to enhanced tunneling probability due to the alteration of potential barriers for proton transfer reactions via water bridges. This work highlights the significance of the QMT effect in racemization and its potential impact on drug safety, providing a fundamental perspective for understanding chirality-related issues in biological systems.
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Affiliation(s)
- Xinrui Yang
- Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China
| | - Depeng Zhang
- Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China
- Normal School, Shenyang University, Shenyang 110044, China
- Key Laboratory of Material Simulation Methods & Software of Ministry of Education, College of Physics, Jilin University, Changchun 130012, China
| | - Rui Liu
- Key Laboratory of Material Simulation Methods & Software of Ministry of Education, College of Physics, Jilin University, Changchun 130012, China
| | - Lu Wang
- Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China
| | - Jing-Yao Liu
- Institute of Theoretical Chemistry, College of Chemistry, Jilin University, Changchun 130023, China
| | - Zhigang Wang
- Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China
- Key Laboratory of Material Simulation Methods & Software of Ministry of Education, College of Physics, Jilin University, Changchun 130012, China
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5
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Yang X, Liu R, Xu R, Wang Z. Sequential flipping: the donor-acceptor exchange mechanism in water trimers. Phys Chem Chem Phys 2023; 25:21957-21963. [PMID: 37553960 DOI: 10.1039/d3cp02666c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/10/2023]
Abstract
The donor-acceptor exchange (DAE) is a significant hydrogen bond network rearrangement (HBNR) mechanism because it can lead to the change of the hydrogen bond direction. In this work, we report a new DAE mechanism found in water trimers that is realized by sequential flipping (SF) of all molecules rather than the well-known proton transfer (PT) process. Meanwhile, the SF process has a much smaller potential barrier (0.262 eV) than the previously predicted collective rotation process (about 1.7 eV), implying that the SF process is the main flipping process that can lead to DAE. Importantly, high-precision ab initio calculations show that SF-DAE can make the water ring to show a clear chiral difference from PT-DAE, which brings the prospect of distinguishing the two confusing processes based on circular dichroism spectra. The reaction rate analysis including quantum tunneling indicates an obvious temperature-dependent competitive relationship between the SF and PT processes; specifically, the SF process dominates above 65 K, while the PT process dominates below 65 K. Therefore, in most cases, the contribution for DAE mainly comes from the flipping process, rather than the PT process as previously thought. Our work enriches the understanding of the DAE mechanism in water trimers and provides a piece of the jigsaw that has been sought for the HBNR mechanism.
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Affiliation(s)
- Xinrui Yang
- Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China.
| | - Rui Liu
- Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China.
| | - Ruiqi Xu
- Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China.
| | - Zhigang Wang
- Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China.
- International Center for Computational Method & Software, College of Physics, Jilin University, Changchun 130012, China
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6
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Trono M. “You Will Say, ‘Wow’”: Cinematic Glamping and Ecomasculine Crisis in (and around) The Revenant. MEDIA+ENVIRONMENT 2022; 4. [DOI: 10.1525/001c.37273] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
Abstract
This article explains how the promotional studio narratives and filmmaker interviews for the frontier drama The Revenant (2015), along with the film’s masculinist adventure narrative, have misrepresented and underserved the ecological conditions at the film’s primary shooting locations in western Canada. Although the film ostensibly pays tribute to the beauty and power of spectacular wilderness regions, the media events involving its release and reception amplified the story’s tropes regarding male suffering in the face of hostile nature, thus hampering the film’s ability to call forth environmental identifications from audiences sufficient to helping effect systems change.
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Perez FP, Bandeira JP, Perez Chumbiauca CN, Lahiri DK, Morisaki J, Rizkalla M. Multidimensional insights into the repeated electromagnetic field stimulation and biosystems interaction in aging and age-related diseases. J Biomed Sci 2022; 29:39. [PMID: 35698225 PMCID: PMC9190166 DOI: 10.1186/s12929-022-00825-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Accepted: 06/07/2022] [Indexed: 11/25/2022] Open
Abstract
We provide a multidimensional sequence of events that describe the electromagnetic field (EMF) stimulation and biological system interaction. We describe this process from the quantum to the molecular, cellular, and organismal levels. We hypothesized that the sequence of events of these interactions starts with the oscillatory effect of the repeated electromagnetic stimulation (REMFS). These oscillations affect the interfacial water of an RNA causing changes at the quantum and molecular levels that release protons by quantum tunneling. Then protonation of RNA produces conformational changes that allow it to bind and activate Heat Shock Transcription Factor 1 (HSF1). Activated HSF1 binds to the DNA expressing chaperones that help regulate autophagy and degradation of abnormal proteins. This action helps to prevent and treat diseases such as Alzheimer’s and Parkinson’s disease (PD) by increasing clearance of pathologic proteins. This framework is based on multiple mathematical models, computer simulations, biophysical experiments, and cellular and animal studies. Results of the literature review and our research point towards the capacity of REMFS to manipulate various networks altered in aging (Reale et al. PloS one 9, e104973, 2014), including delay of cellular senescence (Perez et al. 2008, Exp Gerontol 43, 307-316) and reduction in levels of amyloid-β peptides (Aβ) (Perez et al. 2021, Sci Rep 11, 621). Results of these experiments using REMFS at low frequencies can be applied to the treatment of patients with age-related diseases. The use of EMF as a non-invasive therapeutic modality for Alzheimer’s disease, specifically, holds promise. It is also necessary to consider the complicated and interconnected genetic and epigenetic effects of the REMFS-biological system’s interaction while avoiding any possible adverse effects.
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Affiliation(s)
- Felipe P Perez
- Indiana University School of Medicine, Indianapolis, IN, USA. .,Division of General Internal Medicine and Geriatrics, Department of Medicine, Indiana University School of Medicine, Indianapolis, IN, USA.
| | - Joseph P Bandeira
- Indiana University School of Medicine, Indianapolis, IN, USA.,Division of General Internal Medicine and Geriatrics, Department of Medicine, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Cristina N Perez Chumbiauca
- Indiana University School of Medicine, Indianapolis, IN, USA.,Division of Rheumatology, Department of Medicine, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Debomoy K Lahiri
- Indiana University School of Medicine, Indianapolis, IN, USA.,Department of Psychiatry, Institute of Psychiatric Research, Neuroscience Research Center, Indiana University School of Medicine, Indianapolis, IN, USA.,Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Jorge Morisaki
- Department of Bioengineering, University of Illinois at Chicago, Chicago, IL, USA
| | - Maher Rizkalla
- Department of Electrical and Computer Engineering, Indiana University-Purdue University, Indianapolis, IN, USA
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8
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Press W, Nöldeke C. Rotational Tunneling in Molecular Crystals Revisited: Realization of Pocket States. Chem Phys 2022. [DOI: 10.1016/j.chemphys.2022.111625] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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9
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Belyanchikov MA, Savinov M, Proschek P, Prokleška J, Zhukova ES, Thomas VG, Bedran ZV, Kadlec F, Kamba S, Dressel M, Gorshunov BP. Fingerprints of Critical Phenomena in a Quantum Paraelectric Ensemble of Nanoconfined Water Molecules. NANO LETTERS 2022; 22:3380-3384. [PMID: 35389652 DOI: 10.1021/acs.nanolett.2c00638] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
We have studied the radio frequency dielectric response of a system consisting of separate polar water molecules periodically arranged in nanocages formed by the crystal lattice of the gemstone beryl. Below T = 20-30 K, quantum effects start to dominate the properties of the electric dipolar system as manifested by a crossover between the Curie-Weiss and the Barrett regimes in the temperature-dependent real dielectric permittivity ε'(T). When analyzing in detail the temperature evolution of the reciprocal permittivity (ε')-1 down to T ≈ 0.3 K and comparing it with the data obtained for conventional quantum paraelectrics, like SrTiO3, KTaO3, we discovered clear signatures of a quantum-critical behavior of the interacting water molecular dipoles: Between T = 6 and 14 K, the reciprocal permittivity follows a quadratic temperature dependence and displays a shallow minimum below 3 K. This is the first observation of "dielectric fingerprints" of quantum-critical phenomena in a paraelectric system of coupled point electric dipoles.
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Affiliation(s)
- Mikhail A Belyanchikov
- Laboratory of Terahertz Spectroscopy, Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology, 141701, Dolgoprudny, Moscow Region, Russia
| | - Maxim Savinov
- Institute of Physics, Czech Academy of Sciences, 18200 Prague 8, Czech Republic
| | - Petr Proschek
- Faculty of Mathematics and Physics, Charles University, 12116 Prague 2, Czech Republic
| | - Jan Prokleška
- Faculty of Mathematics and Physics, Charles University, 12116 Prague 2, Czech Republic
| | - Elena S Zhukova
- Laboratory of Terahertz Spectroscopy, Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology, 141701, Dolgoprudny, Moscow Region, Russia
| | - Victor G Thomas
- Sobolev Institute of Geology and Mineralogy, 630090 Novosibirsk, Russia
- Novosibirsk State University, 630090 Novosibirsk, Russia
| | - Zakhar V Bedran
- Laboratory of Terahertz Spectroscopy, Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology, 141701, Dolgoprudny, Moscow Region, Russia
| | - Filip Kadlec
- Institute of Physics, Czech Academy of Sciences, 18200 Prague 8, Czech Republic
| | - Stanislav Kamba
- Institute of Physics, Czech Academy of Sciences, 18200 Prague 8, Czech Republic
| | - Martin Dressel
- 1. Physikalisches Institut, Universität Stuttgart, 70569 Stuttgart, Germany
| | - Boris P Gorshunov
- Laboratory of Terahertz Spectroscopy, Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology, 141701, Dolgoprudny, Moscow Region, Russia
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10
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Moid M, Finkelstein Y, Moreh R, Maiti PK. Anisotropy of the Proton Kinetic Energy as a Tool for Capturing Structural Transition in Water Confined in a Graphene Nanoslit Pore. J Phys Chem Lett 2022; 13:455-461. [PMID: 34995445 DOI: 10.1021/acs.jpclett.1c03086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The proton dynamics of a 2D water monolayer confined inside a graphene slit pore is studied in Cartesian and molecular frames of reference using molecular dynamics simulations. The vibrational density of states of the proton was calculated versus temperature and was further used to deduce the mean kinetic energy of the hydrogen atoms, Ke(H), in both frames of reference. The directional components of Ke(H) are in good agreement with experimental observations for bulk as well as nanoconfined water. Nonetheless, while in the molecular frame of reference the effect of temperature on the anisotropy ratios of Ke(H) (the ratio between its directional components) are practically invariant between the 2D and 3D cases, those in the Cartesian frame of reference reveal a rather notable reduction across 200 K, indicating the occurrence of an order-disorder transition. This result is further supported by the calculated entropy and enthalpy of the confined water molecules. Overall, it is shown that Ke(H) anisotropy ratios may serve as a valuable order parameter for detecting structural transformations in hydrogen bonds containing molecular systems.
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Affiliation(s)
- Mohd Moid
- Centre for Condensed Matter Theory, Department of Physics, Indian Institute of Science, Bangalore 560012, India
| | | | - Raymond Moreh
- Physics Department, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
| | - Prabal K Maiti
- Centre for Condensed Matter Theory, Department of Physics, Indian Institute of Science, Bangalore 560012, India
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11
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Belyanchikov M, Bedran Z, Savinov M, Bednyakov P, Proschek P, Prokleska J, Abalmasov V, Zhukova E, Thomas VG, Dudka A, Zhugayevych A, Petzelt J, Prokhorov A, Anzin V, Kremer R, Fischer JKH, Lunkenheimer P, Loidl A, Uykur E, Dressel M, Gorshunov B. Single-particle and collective excitations of polar water molecules confined in nano-pores within cordierite crystal lattice. Phys Chem Chem Phys 2022; 24:6890-6904. [DOI: 10.1039/d1cp05338h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Recently, the low-temperature phase of water molecules confined within nanocages formed by the crystalline lattice of water-containing cordierite crystals was reported to comprise domains with ferroelectrically ordered dipoles within the...
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12
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Rtimi S, Kiwi J, Nadtochenko V. Photo-induced environmental remediation, biomedical imaging, and microbial inactivation by Mn-doped semiconductors: critical issues. Curr Opin Chem Eng 2021. [DOI: 10.1016/j.coche.2021.100731] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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13
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Krishnamoorthy A, Nomura KI, Baradwaj N, Shimamura K, Rajak P, Mishra A, Fukushima S, Shimojo F, Kalia R, Nakano A, Vashishta P. Dielectric Constant of Liquid Water Determined with Neural Network Quantum Molecular Dynamics. PHYSICAL REVIEW LETTERS 2021; 126:216403. [PMID: 34114857 DOI: 10.1103/physrevlett.126.216403] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/24/2020] [Accepted: 03/30/2021] [Indexed: 06/12/2023]
Abstract
The static dielectric constant ϵ_{0} and its temperature dependence for liquid water is investigated using neural network quantum molecular dynamics (NNQMD). We compute the exact dielectric constant in canonical ensemble from NNQMD trajectories using fluctuations in macroscopic polarization computed from maximally localized Wannier functions (MLWF). Two deep neural networks are constructed. The first, NNQMD, is trained on QMD configurations for liquid water under a variety of temperature and density conditions to learn potential energy surface and forces and then perform molecular dynamics simulations. The second network, NNMLWF, is trained to predict locations of MLWF of individual molecules using the atomic configurations from NNQMD. Training data for both the neural networks is produced using a highly accurate quantum-mechanical method, DFT-SCAN that yields an excellent description of liquid water. We produce 280×10^{6} configurations of water at 7 temperatures using NNQMD and predict MLWF centers using NNMLWF to compute the polarization fluctuations. The length of trajectories needed for a converged value of the dielectric constant at 0°C is found to be 20 ns (40×10^{6} configurations with 0.5 fs time step). The computed dielectric constants for 0, 15, 30, 45, 60, 75, and 90°C are in good agreement with experiments. Our scalable scheme to compute dielectric constants with quantum accuracy is also applicable to other polar molecular liquids.
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Affiliation(s)
- Aravind Krishnamoorthy
- Collaboratory for Advanced Computing and Simulations, Department of Chemical Engineering and Materials Science, Department of Physics & Astronomy, and Department of Computer Science, University of Southern California, Los Angeles, California 90089, USA
| | - Ken-Ichi Nomura
- Collaboratory for Advanced Computing and Simulations, Department of Chemical Engineering and Materials Science, Department of Physics & Astronomy, and Department of Computer Science, University of Southern California, Los Angeles, California 90089, USA
| | - Nitish Baradwaj
- Collaboratory for Advanced Computing and Simulations, Department of Chemical Engineering and Materials Science, Department of Physics & Astronomy, and Department of Computer Science, University of Southern California, Los Angeles, California 90089, USA
| | - Kohei Shimamura
- Department of Physics, Kumamoto University, Kumamoto 860-8555, Japan
| | - Pankaj Rajak
- Argonne National Laboratory, Lemont, Illinois 60439, USA
| | - Ankit Mishra
- Collaboratory for Advanced Computing and Simulations, Department of Chemical Engineering and Materials Science, Department of Physics & Astronomy, and Department of Computer Science, University of Southern California, Los Angeles, California 90089, USA
| | - Shogo Fukushima
- Department of Physics, Kumamoto University, Kumamoto 860-8555, Japan
| | - Fuyuki Shimojo
- Department of Physics, Kumamoto University, Kumamoto 860-8555, Japan
| | - Rajiv Kalia
- Collaboratory for Advanced Computing and Simulations, Department of Chemical Engineering and Materials Science, Department of Physics & Astronomy, and Department of Computer Science, University of Southern California, Los Angeles, California 90089, USA
| | - Aiichiro Nakano
- Collaboratory for Advanced Computing and Simulations, Department of Chemical Engineering and Materials Science, Department of Physics & Astronomy, and Department of Computer Science, University of Southern California, Los Angeles, California 90089, USA
| | - Priya Vashishta
- Collaboratory for Advanced Computing and Simulations, Department of Chemical Engineering and Materials Science, Department of Physics & Astronomy, and Department of Computer Science, University of Southern California, Los Angeles, California 90089, USA
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14
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Drużbicki K, Gaboardi M, Fernandez-Alonso F. Dynamics & Spectroscopy with Neutrons-Recent Developments & Emerging Opportunities. Polymers (Basel) 2021; 13:1440. [PMID: 33947108 PMCID: PMC8125526 DOI: 10.3390/polym13091440] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2021] [Accepted: 04/27/2021] [Indexed: 12/19/2022] Open
Abstract
This work provides an up-to-date overview of recent developments in neutron spectroscopic techniques and associated computational tools to interrogate the structural properties and dynamical behavior of complex and disordered materials, with a focus on those of a soft and polymeric nature. These have and continue to pave the way for new scientific opportunities simply thought unthinkable not so long ago, and have particularly benefited from advances in high-resolution, broadband techniques spanning energy transfers from the meV to the eV. Topical areas include the identification and robust assignment of low-energy modes underpinning functionality in soft solids and supramolecular frameworks, or the quantification in the laboratory of hitherto unexplored nuclear quantum effects dictating thermodynamic properties. In addition to novel classes of materials, we also discuss recent discoveries around water and its phase diagram, which continue to surprise us. All throughout, emphasis is placed on linking these ongoing and exciting experimental and computational developments to specific scientific questions in the context of the discovery of new materials for sustainable technologies.
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Affiliation(s)
- Kacper Drużbicki
- Materials Physics Center, CSIC-UPV/EHU, Paseo Manuel de Lardizabal 5, 20018 Donostia-San Sebastian, Spain;
- Polish Academy of Sciences, Center of Molecular and Macromolecular Studies, Sienkiewicza 112, 90-363 Lodz, Poland
| | - Mattia Gaboardi
- Elettra—Sincrotrone Trieste S.C.p.A., S.S. 14 km 163.5 in Area Science Park, 34149 Trieste, Italy;
| | - Felix Fernandez-Alonso
- Materials Physics Center, CSIC-UPV/EHU, Paseo Manuel de Lardizabal 5, 20018 Donostia-San Sebastian, Spain;
- Donostia International Physics Center (DIPC), Paseo Manuel de Lardizabal 4, 20018 Donostia-San Sebastian, Spain
- Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK
- IKERBASQUE, Basque Foundation for Science, Plaza Euskadi 5, 48009 Bilbao, Spain
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15
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Shugai A, Nagel U, Murata Y, Li Y, Mamone S, Krachmalnicoff A, Alom S, Whitby RJ, Levitt MH, Rõõm T. Infrared spectroscopy of an endohedral water in fullerene. J Chem Phys 2021; 154:124311. [PMID: 33810704 DOI: 10.1063/5.0047350] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
An infrared absorption spectroscopy study of the endohedral water molecule in a solid mixture of H2O@C60 and C60 was carried out at liquid helium temperature. From the evolution of the spectra during the ortho-para conversion process, the spectral lines were identified as para-H2O and ortho-H2O transitions. Eight vibrational transitions with rotational side peaks were observed in the mid-infrared: ω1, ω2, ω3, 2ω1, 2ω2, ω1 + ω3, ω2 + ω3, and 2ω2 + ω3. The vibrational frequencies ω2 and 2ω2 are lower by 1.6% and the rest by 2.4%, as compared to those of free H2O. A model consisting of a rovibrational Hamiltonian with the dipole and quadrupole moments of H2O interacting with the crystal field was used to fit the infrared absorption spectra. The electric quadrupole interaction with the crystal field lifts the degeneracy of the rotational levels. The finite amplitudes of the pure v1 and v2 vibrational transitions are consistent with the interaction of the water molecule dipole moment with a lattice-induced electric field. The permanent dipole moment of encapsulated H2O is found to be 0.50 ± 0.05 D as determined from the far-infrared rotational line intensities. The translational mode of the quantized center-of-mass motion of H2O in the molecular cage of C60 was observed at 110 cm-1 (13.6 meV).
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Affiliation(s)
- A Shugai
- National Institute of Chemical Physics and Biophysics, Akadeemia tee 23, 12618 Tallinn, Estonia
| | - U Nagel
- National Institute of Chemical Physics and Biophysics, Akadeemia tee 23, 12618 Tallinn, Estonia
| | - Y Murata
- Institute for Chemical Research, Kyoto University, Kyoto 611-0011, Japan
| | - Yongjun Li
- Department of Chemistry, Columbia University, New York, New York 10027, USA
| | - S Mamone
- School of Chemistry, Southampton University, Southampton SO17 1BJ, United Kingdom
| | - A Krachmalnicoff
- School of Chemistry, Southampton University, Southampton SO17 1BJ, United Kingdom
| | - S Alom
- School of Chemistry, Southampton University, Southampton SO17 1BJ, United Kingdom
| | - R J Whitby
- School of Chemistry, Southampton University, Southampton SO17 1BJ, United Kingdom
| | - M H Levitt
- School of Chemistry, Southampton University, Southampton SO17 1BJ, United Kingdom
| | - T Rõõm
- National Institute of Chemical Physics and Biophysics, Akadeemia tee 23, 12618 Tallinn, Estonia
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16
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Zhang D, Yang X, Jiang W, Jin L, Gao Y, Wang Z. Pauli Repulsion Enhances Mobility of Ultraconfined Water. ACS NANO 2021; 15:2490-2496. [PMID: 33470792 DOI: 10.1021/acsnano.0c06508] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Water is ubiquitous on Earth and dominates chemical and biological processes in daily life. However, how water behaves under some critical conditions is not fully understood. In this paper, we employed quantum first-principles calculations and dynamics simulations to reveal the unexpectedly high mobility of water molecules in ultraconfined spaces. The water molecules rotated more freely in the (4, 4) carbon nanotube than in the (5, 5) carbon nanotube, which is induced by the Pauli repulsion from the wall of the narrower channel when reducing the size of the channel from general confinement to ultraconfinement. Moreover, this quantum effect facilitates the transport of water molecules into the space within their van der Waals diameter easily, which is in contrast to the general understanding. Thus, the conventional concept that the tighter the confined space, the more difficult the motion of the confined object is not always correct. This quantum-induced enhancement of water mobility by Pauli repulsion calls us to pay more attention to the existence and the function of water in neglected ultraconfined spaces (e.g., cells and the Earth's crust) in the future.
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Affiliation(s)
| | | | | | | | - Yi Gao
- Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
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17
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Ulpiani P, Romanelli G, Onorati D, Krzystyniak M, Andreani C, Senesi R. The effective isotropy of the hydrogen local potential in biphenyl and other hydrocarbons. J Chem Phys 2020; 153:234306. [PMID: 33353342 DOI: 10.1063/5.0029578] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We present an experimental investigation of the hydrogen nuclear momentum distribution in biphenyl using deep inelastic neutron scattering. Our experimental results suggest that the local potential affecting hydrogen is both harmonic and isotropic within experimental uncertainties. This feature is interpreted as a consequence of the central limit theorem, whereby the three-dimensional momentum distribution is expected to become a purely Gaussian function as the number of independent vibrational modes in a system increases. We also performed ab initio phonon calculations on biphenyl and other saturated hydrocarbons, from methane to decane. From the results of the simulations, one can observe that the nuclear momentum distribution becomes more isotropic as the number of atoms and normal modes in the molecule increases. Moreover, the predicted theoretical anisotropy in biphenyl is clearly larger than in the experiment. The reason is that the total number of normal modes necessary to reproduce the experimental results is much larger than the number of normal modes encompassed by a single unit cell due to the presence of structural disorder and intermolecular interactions in the real crystal, as well as coupling of different normal modes. Finally, experimental data were collected, over a subset of detectors on the VESUVIO spectrometer at ISIS, with a novel setup to increase the count rate and signal-to-background ratio. We envision that such an optimized experimental setup can provide faster measurements and more stringent constraints for phonon calculations.
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Affiliation(s)
- Pierfrancesco Ulpiani
- Università degli Studi di Roma "Tor Vergata," Dipartimento di Scienze e Tecnologie Chimiche, Via della Ricerca Scientifica 1, Rome 00133, Italy
| | - Giovanni Romanelli
- ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11OQX, United Kingdom
| | - Dalila Onorati
- Università degli Studi di Roma "Tor Vergata," Dipartimento di Fisica and NAST Center, Via della Ricerca Scientifica 1, Rome 00133, Italy
| | - Matthew Krzystyniak
- ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11OQX, United Kingdom
| | - Carla Andreani
- Università degli Studi di Roma "Tor Vergata," Dipartimento di Fisica and NAST Center, Via della Ricerca Scientifica 1, Rome 00133, Italy
| | - Roberto Senesi
- Università degli Studi di Roma "Tor Vergata," Dipartimento di Fisica and NAST Center, Via della Ricerca Scientifica 1, Rome 00133, Italy
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18
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Andreani C, Romanelli G, Parmentier A, Senesi R, Kolesnikov AI, Ko HY, Calegari Andrade MF, Car R. Hydrogen Dynamics in Supercritical Water Probed by Neutron Scattering and Computer Simulations. J Phys Chem Lett 2020; 11:9461-9467. [PMID: 33108193 DOI: 10.1021/acs.jpclett.0c02547] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
In this work, an investigation of supercritical water is presented combining inelastic and deep inelastic neutron scattering experiments and molecular dynamics simulations based on a machine-learned potential of ab initio quality. The local hydrogen dynamics is investigated at 250 bar and in the temperature range of 553-823 K, covering the evolution from subcritical liquid to supercritical gas-like water. The evolution of libration, bending, and stretching motions in the vibrational density of states is studied, analyzing the spectral features by a mode decomposition. Moreover, the hydrogen nuclear momentum distribution is measured, and its anisotropy is probed experimentally. It is shown that hydrogen bonds survive up to the higher temperatures investigated, and we discuss our results in the framework of the coupling between intramolecular modes and intermolecular librations. Results show that the local potential affecting hydrogen becomes less anisotropic within the molecular plane in the supercritical phase, and we attribute this result to the presence of more distorted hydrogen bonds.
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Affiliation(s)
- Carla Andreani
- Dipartimento di Fisica and NAST Centre, Università degli Studi di Roma Tor Vergata, Via della Ricerca Scientifica 1, 00133 Roma, Italy
- CNR-IPCF, Istituto per i Processi Chimico-Fisici del CNR di Messina, Viale F. Stagno dAlcontres 37, 98158 Messina, Italy
| | - Giovanni Romanelli
- ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, United Kingdom
| | | | - Roberto Senesi
- Dipartimento di Fisica and NAST Centre, Università degli Studi di Roma Tor Vergata, Via della Ricerca Scientifica 1, 00133 Roma, Italy
- CNR-IPCF, Istituto per i Processi Chimico-Fisici del CNR di Messina, Viale F. Stagno dAlcontres 37, 98158 Messina, Italy
| | - Alexander I Kolesnikov
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Hsin-Yu Ko
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, United States
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19
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Ben Ishai P, Kidder MK, Kolesnikov AI, Anovitz LM. One-Dimensional Glassy Behavior of Ultraconfined Water Strings. J Phys Chem Lett 2020; 11:7798-7804. [PMID: 32845641 DOI: 10.1021/acs.jpclett.0c02026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Water is renowned for its anomalous behaviors, which can be linked to a distributed H-bond network in bulk water. Ultraconfinement of the water molecule can remove H-bonding, leaving only molecular water. In natural cordierite crystals, water is trapped in an orthorhombic channel with an average diameter of 5.7 Å, running through the center of the unit cell parallel to the c-axis. Calorimetric measurements reveal the existence of a one-dimensional (1D) glass linked to this water. In these channels, water molecules in truncated, sparse 1D strings interact only via dipole-dipole correlations. A physical 1D glass is formed from these strings. This unusual state can be explained by a modified Ising model. This model predicts a dependence of the glass transition temperature, Tg, on the size of these domains. This is confirmed experimentally.
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Affiliation(s)
- Paul Ben Ishai
- Department of Physics, Ariel University, 40700 Ariel, Israel
| | - Michelle K Kidder
- Energy and Transportation Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Alexander I Kolesnikov
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Lawrence M Anovitz
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
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20
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Belyanchikov MA, Savinov M, Bedran ZV, Bednyakov P, Proschek P, Prokleska J, Abalmasov VA, Petzelt J, Zhukova ES, Thomas VG, Dudka A, Zhugayevych A, Prokhorov AS, Anzin VB, Kremer RK, Fischer JKH, Lunkenheimer P, Loidl A, Uykur E, Dressel M, Gorshunov B. Dielectric ordering of water molecules arranged in a dipolar lattice. Nat Commun 2020; 11:3927. [PMID: 32764722 PMCID: PMC7411056 DOI: 10.1038/s41467-020-17832-y] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2019] [Accepted: 07/17/2020] [Indexed: 11/09/2022] Open
Abstract
Intermolecular hydrogen bonds impede long-range (anti-)ferroelectric order of water. We confine H2O molecules in nanosized cages formed by ions of a dielectric crystal. Arranging them in channels at a distance of ~5 Å with an interchannel separation of ~10 Å prevents the formation of hydrogen networks while electric dipole-dipole interactions remain effective. Here, we present measurements of the temperature-dependent dielectric permittivity, pyrocurrent, electric polarization and specific heat that indicate an order-disorder ferroelectric phase transition at T0 ≈ 3 K in the water dipolar lattice. Ab initio molecular dynamics and classical Monte Carlo simulations reveal that at low temperatures the water molecules form ferroelectric domains in the ab-plane that order antiferroelectrically along the channel direction. This way we achieve the long-standing goal of arranging water molecules in polar order. This is not only of high relevance in various natural systems but might open an avenue towards future applications in biocompatible nanoelectronics. Despite the apparent simplicity of a H2O molecule, the mutual ferroelectric ordering of the molecules is unresolved. Here, the authors realize a macroscopic ferroelectric phase transition in a network of dipole-dipole coupled water molecules located in nanopores of gemstone.
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Affiliation(s)
- M A Belyanchikov
- Moscow Institute of Physics and Technology (National Research University), 141701 Dolgoprudny, Moscow Region, Russia.
| | - M Savinov
- Institute of Physics, Czech Academy of Sciences, 18221, Praha 8, Czech Republic
| | - Z V Bedran
- Moscow Institute of Physics and Technology (National Research University), 141701 Dolgoprudny, Moscow Region, Russia
| | - P Bednyakov
- Institute of Physics, Czech Academy of Sciences, 18221, Praha 8, Czech Republic
| | - P Proschek
- Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University, 12116, Prague 2, Czech Republic
| | - J Prokleska
- Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University, 12116, Prague 2, Czech Republic
| | - V A Abalmasov
- Institute of Automation and Electrometry SB RAS, 630090, Novosibirsk, Russia
| | - J Petzelt
- Institute of Physics, Czech Academy of Sciences, 18221, Praha 8, Czech Republic
| | - E S Zhukova
- Moscow Institute of Physics and Technology (National Research University), 141701 Dolgoprudny, Moscow Region, Russia
| | - V G Thomas
- Sobolev Institute of Geology and Mineralogy, RAS, 630090, Novosibirsk, Russia.,Novosibirsk State University, 630090, Novosibirsk, Russia
| | - A Dudka
- Shubnikov Institute of Crystallography, "Crystallography and Photonics", Russian Academy of Sciences, 119333, Moscow, Russia
| | - A Zhugayevych
- Skolkovo Institute of Science and Technology, 143026, Moscow, Russia
| | - A S Prokhorov
- Moscow Institute of Physics and Technology (National Research University), 141701 Dolgoprudny, Moscow Region, Russia.,Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia
| | - V B Anzin
- Moscow Institute of Physics and Technology (National Research University), 141701 Dolgoprudny, Moscow Region, Russia.,Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia
| | - R K Kremer
- Max-Planck-Institut für Festkörperforschung, 70569, Stuttgart, Germany
| | - J K H Fischer
- Experimental Physics V, University of Augsburg, 86135, Augsburg, Germany.,T. Kimura Lab, Department of Advanced Materials Science, University of Tokyo, Tokyo, Japan
| | - P Lunkenheimer
- Experimental Physics V, University of Augsburg, 86135, Augsburg, Germany
| | - A Loidl
- Experimental Physics V, University of Augsburg, 86135, Augsburg, Germany
| | - E Uykur
- 1.Physikalisches Institut, Universität Stuttgart, 70569, Stuttgart, Germany
| | - M Dressel
- Moscow Institute of Physics and Technology (National Research University), 141701 Dolgoprudny, Moscow Region, Russia.,1.Physikalisches Institut, Universität Stuttgart, 70569, Stuttgart, Germany
| | - B Gorshunov
- Moscow Institute of Physics and Technology (National Research University), 141701 Dolgoprudny, Moscow Region, Russia.
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21
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Monet G, Paineau E, Chai Z, Amara MS, Orecchini A, Jimenéz-Ruiz M, Ruiz-Caridad A, Fine L, Rouzière S, Liu LM, Teobaldi G, Rols S, Launois P. Solid wetting-layers in inorganic nano-reactors: the water in imogolite nanotube case. NANOSCALE ADVANCES 2020; 2:1869-1877. [PMID: 36132525 PMCID: PMC9419085 DOI: 10.1039/d0na00128g] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2020] [Accepted: 04/09/2020] [Indexed: 05/24/2023]
Abstract
By combined use of wide-angle X-ray scattering, thermo-gravimetric analysis, inelastic neutron scattering, density functional theory and density functional theory molecular dynamics simulations, we investigate the structure, dynamics and stability of the water wetting-layer in single-walled aluminogermanate imogolite nanotubes (SW Ge-INTs): an archetypal system for synthetically controllable and monodisperse nano-reactors. We demonstrate that the water wetting-layer is strongly bound and solid-like up to 300 K under atmospheric pressure, with dynamics markedly different from that of bulk water. Atomic-scale characterisation of the wetting-layer reveals organisation of the H2O molecules in a curved triangular sublattice stabilised by the formation of three H-bonds to the nanotube's inner surface, with covalent interactions sufficiently strong to promote energetically favourable decoupling of the H2O molecules in the adlayer. The evidenced changes in the local composition, structure, electrostatics and dynamics of the Ge-INT's inner surface upon the formation of the solid wetting-layer demonstrate solvent-mediated functionalisation of the nanotube's cavity at room temperature and pressure, suggesting new strategies for the design of nano-rectors towards potential control of chemical reactivity in nano-confined volumes.
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Affiliation(s)
- Geoffrey Monet
- Laboratoire de Physique des Solides, CNRS, Université Paris-Sud, Université Paris-Saclay 91405 Orsay Cedex France
| | - Erwan Paineau
- Laboratoire de Physique des Solides, CNRS, Université Paris-Sud, Université Paris-Saclay 91405 Orsay Cedex France
| | - Ziwei Chai
- Beijing Computational Science Research Centre 100193 Beijing China
| | - Mohamed S Amara
- Laboratoire de Physique des Solides, CNRS, Université Paris-Sud, Université Paris-Saclay 91405 Orsay Cedex France
| | - Andrea Orecchini
- Dipartimento di Fisica e Geologia, CNR-IOM, Università di Perugia Via Pascoli s.n.c I-06123 Perugia Italy
| | | | - Alicia Ruiz-Caridad
- Laboratoire de Physique des Solides, CNRS, Université Paris-Sud, Université Paris-Saclay 91405 Orsay Cedex France
- Institut Laue-Langevin BP 156 38042 Grenoble France
| | - Lucas Fine
- Institut Laue-Langevin BP 156 38042 Grenoble France
| | - Stéphan Rouzière
- Laboratoire de Physique des Solides, CNRS, Université Paris-Sud, Université Paris-Saclay 91405 Orsay Cedex France
| | - Li-Min Liu
- Beijing Computational Science Research Centre 100193 Beijing China
- School of Physics, Beihang University 100191 Beijing China
| | - Gilberto Teobaldi
- Beijing Computational Science Research Centre 100193 Beijing China
- Scientific Computing Department, STFC Harwell Campus OX11 0QX Didcot UK
- School of Chemistry, University of Southampton SO17 1BJ Southampton UK
- Stephenson Institute for Renewable Energy, Department of Chemistry, University of Liverpool L69 3BX Liverpool UK
| | | | - Pascale Launois
- Laboratoire de Physique des Solides, CNRS, Université Paris-Sud, Université Paris-Saclay 91405 Orsay Cedex France
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22
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Finkelstein Y, Nemirovsky D, Moreh R. Kinetic energy of oxygen atoms in water and in silica hydrogel. Chem Phys 2020. [DOI: 10.1016/j.chemphys.2020.110716] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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23
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Applegate LC, Forbes TZ. Controlling water structure and behavior: design principles from metal organic nanotubular materials. CrystEngComm 2020. [DOI: 10.1039/d0ce00331j] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Water exhibits unique and unexpected behavioral and structural changes when confined to the nanoscale, notably within the pores of metal–organic nanotubes.
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24
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Moid M, Finkelstein Y, Moreh R, Maiti PK. Microscopic Study of Proton Kinetic Energy Anomaly for Nanoconfined Water. J Phys Chem B 2019; 124:190-198. [DOI: 10.1021/acs.jpcb.9b08667] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mohd Moid
- Centre for Condensed Matter Theory, Department of Physics, Indian Institute of Science, Bangalore 560012, India
| | | | - Raymond Moreh
- Physics Department, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
| | - Prabal K. Maiti
- Centre for Condensed Matter Theory, Department of Physics, Indian Institute of Science, Bangalore 560012, India
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25
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Carnevale D, Marhabaie S, Pelupessy P, Bodenhausen G. Orientation-Dependent Proton Relaxation of Water Molecules Trapped in Solids: Crystallites with Long-Lived Magnetization. J Phys Chem A 2019; 123:9763-9769. [PMID: 31633935 DOI: 10.1021/acs.jpca.9b07303] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The longitudinal spin-lattice relaxation properties of water molecules trapped in a static powdered polycrystalline sample of barium chlorate monohydrate are investigated by means of solid-state 1H NMR spectroscopy. Different portions of the inhomogeneous Pake pattern that are associated with crystallites at different orientations with respect to the external magnetic field show either a mono- or a biexponential recovery. At high field (9.4 T), the chemical shift anisotropy is the main interaction that is responsible for the inhomogeneity of the relaxation rates. A theoretical description of rapid two-site hopping about the H-O-H bisector in the framework of Liouville space agrees very well with the experimental evidence. Numerical simulations predict a distribution of monoexponential time constants associated with individual single-crystal orientations. Overlapping signals give rise to biexponential recovery. This is confirmed experimentally by 1H NMR spectra of static single crystals.
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Affiliation(s)
- Diego Carnevale
- Laboratoire des biomolécules, LBM, Département de chimie, École normale supérieure , PSL University, Sorbonne Université, CNRS , 75005 Paris , France
| | - Sina Marhabaie
- Laboratoire des biomolécules, LBM, Département de chimie, École normale supérieure , PSL University, Sorbonne Université, CNRS , 75005 Paris , France
| | - Philippe Pelupessy
- Laboratoire des biomolécules, LBM, Département de chimie, École normale supérieure , PSL University, Sorbonne Université, CNRS , 75005 Paris , France
| | - Geoffrey Bodenhausen
- Laboratoire des biomolécules, LBM, Département de chimie, École normale supérieure , PSL University, Sorbonne Université, CNRS , 75005 Paris , France
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26
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Carnevale D, Pelupessy P, Bodenhausen G. Cross-term Splittings Due to the Orientational Inequivalence of Proton Magnetic Shielding Tensors: Do Water Molecules Trapped in Crystals Hop or Tunnel? J Phys Chem Lett 2019; 10:3224-3231. [PMID: 31059264 DOI: 10.1021/acs.jpclett.9b00914] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Water molecules trapped in crystals of barium chlorate monohydrate have been investigated by magic-angle spinning (MAS) proton NMR spectroscopy in the temperature range 110-300 K. At high temperatures, a single spinning sideband pattern is observed. Below 150 K, however, two interleaved spinning sideband manifolds appear, with distinct centerbands that do not coincide with the average isotropic chemical shift seen at high temperatures. This hitherto unknown "cross-term splitting" results from the interplay of the homonuclear dipole-dipole coupling and two anisotropic proton shielding tensors that have identical principal components but nonequivalent orientations. The resulting cross terms cannot be averaged out by rotation about the magic angle. The analysis of the exchange-induced broadening, coalescence, and narrowing of the cross-term splitting in MAS spectra allows one to estimate the rate of exchange of the two protons between 140 and 190 K. The experimental data is compared with 2H and 1H NMR studies of the same sample reported in the literature. Density functional theory methods are utilized to estimate the thermal activation energy for a 2-fold hopping process of proton exchange about the H-O-H bisector. The Bell-Limbach model allows one to take into account contributions due to incoherent quantum tunneling in the low-temperature regime.
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Affiliation(s)
- Diego Carnevale
- Laboratoire des Biomolécules, LBM, Département de Chimie , École Normale Supérieure , PSL University, Sorbonne Université, CNRS, 75005 Paris , France
| | - Philippe Pelupessy
- Laboratoire des Biomolécules, LBM, Département de Chimie , École Normale Supérieure , PSL University, Sorbonne Université, CNRS, 75005 Paris , France
| | - Geoffrey Bodenhausen
- Laboratoire des Biomolécules, LBM, Département de Chimie , École Normale Supérieure , PSL University, Sorbonne Université, CNRS, 75005 Paris , France
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27
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Kolesnikov AI, Anovitz LM, Hawthorne FC, Podlesnyak A, Schenter GK. Effect of fine-tuning pore structures on the dynamics of confined water. J Chem Phys 2019; 150:204706. [DOI: 10.1063/1.5096771] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- A. I. Kolesnikov
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - L. M. Anovitz
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - F. C. Hawthorne
- Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
| | - A. Podlesnyak
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - G. K. Schenter
- Physical Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 93352, USA
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28
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Xue Z, Ramirez‐Cuesta AJ, Brown CM, Calder S, Cao H, Chakoumakos BC, Daemen LL, Huq A, Kolesnikov AI, Mamontov E, Podlesnyak AA, Wang X. Neutron Instruments for Research in Coordination Chemistry. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201801076] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Zi‐Ling Xue
- Department of Chemistry University of Tennessee 37996 Knoxville Tennessee United States
| | - Anibal J. Ramirez‐Cuesta
- Neutron Scattering Division Oak Ridge National Laboratory 37831 Oak Ridge Tennessee United States
| | - Craig M. Brown
- Center for Neutron Research National Institute of Standards and Technology 20899 Gaithersburg Maryland United States
- Department of Chemical and Biomolecular Engineering University of Delaware 19716 Newark Delaware United States
| | - Stuart Calder
- Neutron Scattering Division Oak Ridge National Laboratory 37831 Oak Ridge Tennessee United States
| | - Huibo Cao
- Neutron Scattering Division Oak Ridge National Laboratory 37831 Oak Ridge Tennessee United States
| | - Bryan C. Chakoumakos
- Neutron Scattering Division Oak Ridge National Laboratory 37831 Oak Ridge Tennessee United States
| | - Luke L. Daemen
- Neutron Scattering Division Oak Ridge National Laboratory 37831 Oak Ridge Tennessee United States
| | - Ashfia Huq
- Neutron Scattering Division Oak Ridge National Laboratory 37831 Oak Ridge Tennessee United States
| | - Alexander I. Kolesnikov
- Neutron Scattering Division Oak Ridge National Laboratory 37831 Oak Ridge Tennessee United States
| | - Eugene Mamontov
- Neutron Scattering Division Oak Ridge National Laboratory 37831 Oak Ridge Tennessee United States
| | - Andrey A. Podlesnyak
- Neutron Scattering Division Oak Ridge National Laboratory 37831 Oak Ridge Tennessee United States
| | - Xiaoping Wang
- Neutron Scattering Division Oak Ridge National Laboratory 37831 Oak Ridge Tennessee United States
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29
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Observation of the thermal influenced quantum behaviour of water near a solid interface. Sci Rep 2018; 8:7016. [PMID: 29725015 PMCID: PMC5934364 DOI: 10.1038/s41598-018-24886-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2017] [Accepted: 04/11/2018] [Indexed: 11/25/2022] Open
Abstract
Water is essential for life. However, the structure and properties of water are still not well understood. It has been introduced that anomalies are in vicinal water near solid interfaces. We performed capillary flow experiments on water with a silica colloid sample using a high-performance liquid chromatography (HPLC) system by accurately varying the temperature and analysed the peak shape rigorously. We obtained a novel anomalous temperature spectrum from the peak-shape analysis. Here we report the observed distinct specific anomalous temperature (SAT) behaviour in vicinal water at silica interface. The anomaly appeared in the viscous force that was derived from a relationship between the shape of the HPLC peak and the velocity profile for the capillary flow. The observations were highly reproducible, and we conclude that the SAT is related to the quantum mechanical behaviour of water, in agreement of the characteristic acceptance of thermal displacement according to the Franck-Condon principle. We performed the same experiments using heavy water and water mixed with a small amount of methanol, and the results support the quantum phenomenological origin.
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30
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Zhukova ES, Belyanchikov M, Savinov M, Bednyakov P, Thomas V, Kadyrov L, Simchuk E, Bedran Z, Torgashev V, Dudka A, Dressel M, Gorshunov B. H2O Molecules Hosted By A Crystalline Matrix – New State Of Water? EPJ WEB OF CONFERENCES 2018. [DOI: 10.1051/epjconf/201819506018] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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31
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Zhang D, Zhang Z, Jiang W, Gao Y, Wang Z. Effect of confinement on water rotation via quantum tunnelling. NANOSCALE 2018; 10:18622-18626. [PMID: 30259939 DOI: 10.1039/c8nr05137b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Water exhibits different behaviors in confined space compared to free space, which is critical for desalination, biosensing, and many potential applications. Recent studies indicated that quantum tunnelling plays an important role in the orientation of H2O molecules and the H-bond network of water clusters, but whether this effect is important in confined space remains elusive. Here, we studied the quantum tunnelling effect of water dimers in carbon nanotubes with different sizes by first-principles calculations. Our results show that though this effect may be negligible at room temperature, it becomes dominant at low temperatures up to ∼100 Kelvin. In particular, with the injection of a small amount of energy to excite a specific vibrational mode, the tunnelling rotation effect can be significantly enhanced, which provides a new strategy to tune the H-bond network of confined water.
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Affiliation(s)
- Depeng Zhang
- Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China.
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32
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Gautam S, Kolesnikov AI, Rother G, Dai S, Qiao ZA, Cole D. Effects of Confinement and Pressure on the Vibrational Behavior of Nano-Confined Propane. J Phys Chem A 2018; 122:6736-6745. [PMID: 30040898 DOI: 10.1021/acs.jpca.8b05028] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Fluids confined in nanopores exhibit significant deviations in their structure and dynamics from the bulk behavior. Although phase, structural, and diffusive behaviors of confined fluids have been investigated and reported extensively, confinement effects on the vibrational properties are less understood. We study the vibrational behavior of propane confined in 1.5 nm nanopores of MCM-41-S using inelastic neutron scattering (INS) and molecular dynamics (MD) simulations. Vibrational spectra have been obtained from INS data as functions of temperature and pressure. At ambient pressure, a strong quasielastic signal observed in the INS spectrum at 80 K suggests that confined propane remains liquid below the bulk phase melting point of 85 K. The quasielastic signal is heavily suppressed when either the pressure is increased to 1 kbar or the temperature is lowered to 30 K, indicating solidification of pore-confined propane. Confinement in MCM-41-S pores results in a glass-like state of propane that exhibits a relatively featureless low-energy vibrational spectrum compared to that of the bulk crystalline propane. Increasing the pressure to 3 kbar results in hardening of the intermolecular and methyl torsional modes. The INS data are used for estimating the isochoric specific heat of confined propane, which is compared with the specific heat of bulk propane reported in literature. Data from MD simulations are used to calculate the vibrational power spectra that agree qualitatively with the experimental data. Simulation data also suggest a reduction of the structural ordering (positional, orientational, and intramolecular) of propane under confinement.
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Affiliation(s)
- Siddharth Gautam
- School of Earth Sciences , The Ohio State University , Columbus , 43210 , Ohio United States
| | | | | | | | - Zhen-An Qiao
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry , Jilin University , Changchun 130012 , China
| | - David Cole
- School of Earth Sciences , The Ohio State University , Columbus , 43210 , Ohio United States
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33
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Methyl quantum tunneling in ionic liquid [DMIm][TFSI] facilitated by Bis(trifluoromethane)sulfonimide lithium salt. Sci Rep 2018; 8:10354. [PMID: 29985444 PMCID: PMC6037680 DOI: 10.1038/s41598-018-28756-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2018] [Accepted: 06/19/2018] [Indexed: 11/09/2022] Open
Abstract
We probe, for the first time, quantum tunneling in the methyl groups of the ionic liquid [DMIm][TFSI] facilitated by the presence of Bis(trifluoromethane)sulfonimide lithium salt. The observation of tunneling is made possible by crystallization, rather than vitrification, of [DMIm][TFSI] at low temperature. Neutron scattering measurements detect quantum tunneling excitations at ~27 μeV at temperatures below 30 K in the presence of LiTFSI at a concentration of 1 mol/kg, but not in salt-free [DMIm][TFSI]. This indicates that the methyl rotational potential barrier is reduced by the presence of LiTFSI, thus bringing the tunneling excitations into the measurable range. The salt-induced reduction of the rotational barrier is corroborated by quasi-elastic scattering data associated with stochastic re-orientation of methyl groups measured between 40 and 60 K.
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34
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Prisk TR, Hoffmann C, Kolesnikov AI, Mamontov E, Podlesnyak AA, Wang X, Kent PRC, Anovitz LM. Fast Rotational Diffusion of Water Molecules in a 2D Hydrogen Bond Network at Cryogenic Temperatures. PHYSICAL REVIEW LETTERS 2018; 120:196001. [PMID: 29799243 DOI: 10.1103/physrevlett.120.196001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2017] [Indexed: 05/15/2023]
Abstract
Individual water molecules or small clusters of water molecules contained within microporous minerals present an extreme case of confinement where the local structure of hydrogen bond networks are dramatically altered from bulk water. In the zinc silicate hemimorphite, the water molecules form a two-dimensional hydrogen bond network with hydroxyl groups in the crystal framework. Here, we present a combined experimental and theoretical study of the structure and dynamics of water molecules within this network. The water molecules undergo a continuous phase transition in their orientational configuration analogous to a two-dimensional Ising model. The incoherent dynamic structure factor reveals two thermally activated relaxation processes, one on a subpicosecond timescale and another on a 10-100 ps timescale, between 70 and 130 K. The slow process is an in-plane reorientation of the water molecule involving the breaking of hydrogen bonds with a framework that, despite the low temperatures involved, is analogous to rotational diffusion of water molecules in the bulk liquid. The fast process is a localized motion of the water molecule with no apparent analogs among known bulk or confined phases of water.
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Affiliation(s)
- T R Prisk
- Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 208996-6100, USA
| | - C Hoffmann
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - A I Kolesnikov
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - E Mamontov
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - A A Podlesnyak
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - X Wang
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - P R C Kent
- Center for Nanophase Materials Sciences and Computational Sciences and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - L M Anovitz
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
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35
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Abstract
The behavior of water confined at the nanoscale plays a fundamental role in biological processes and technological applications, including protein folding, translocation of water across membranes, and filtration and desalination. Remarkably, nanoscale confinement drastically alters the properties of water. Using molecular dynamics simulations, we determine the phase diagram of water confined by graphene sheets in slab geometry, at T = 300 K and for a wide range of pressures. We find that, depending on the confining dimension D and density σ, water can exist in liquid and vapor phases, or crystallize into monolayer and bilayer square ices, as observed in experiments. Interestingly, depending on D and σ, the crystal-liquid transformation can be a first-order phase transition, or smooth, reminiscent of a supercritical liquid-gas transformation. We also focus on the limit of stability of the liquid relative to the vapor and obtain the cavitation pressure perpendicular to the graphene sheets. Perpendicular cavitation pressure varies non-monotonically with increasing D and exhibits a maximum at D ≈ 0.90 nm (equivalent to three water layers). The effect of nanoconfinement on the cavitation pressure can have an impact on water transport in technological and biological systems. Our study emphasizes the rich and apparently unpredictable behavior of nanoconfined water, which is complex even for graphene.
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36
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Potential Role of Inorganic Confined Environments in Prebiotic Phosphorylation. Life (Basel) 2018; 8:life8010007. [PMID: 29510574 PMCID: PMC5871939 DOI: 10.3390/life8010007] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2017] [Revised: 01/25/2018] [Accepted: 02/28/2018] [Indexed: 01/19/2023] Open
Abstract
A concise outlook on the potential role of confinement in phosphorylation and phosphate condensation pertaining to prebiotic chemistry is presented. Inorganic confinement is a relatively uncharted domain in studies concerning prebiotic chemistry, and even more so in terms of experimentation. However, molecular crowding within confined dimensions is central to the functioning of contemporary biology. There are numerous advantages to confined environments and an attempt to highlight this fact, within this article, has been undertaken, keeping in context the limitations of aqueous phase chemistry in phosphorylation and, to a certain extent, traditional approaches in prebiotic chemistry.
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37
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Novikov VN, Sokolov AP. Quantum effects in dynamics of water and other liquids of light molecules. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2017; 40:57. [PMID: 28510231 DOI: 10.1140/epje/i2017-11546-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2017] [Accepted: 05/04/2017] [Indexed: 06/07/2023]
Abstract
Nuclear quantum effects in atomic motions are well known at low temperatures [Formula: see text] K, but analyses of structural relaxation in liquids and description of the glass transition traditionally neglect quantum effects at higher temperatures, [Formula: see text] K. Recent studies, however, suggested that nuclear quantum effects in systems of light molecules (e.g., water) might play an important role in structural dynamics and provide non-negligible contributions at such temperatures, and even up to ambient temperature. In this article, we discuss experimental evidences of the quantum effects in glass transition in liquids of light molecules and possible theoretical descriptions of these effects. We show that quantum effects may qualitatively change the temperature behavior of the structural relaxation time in supercooled liquids leading to deviations of some well-established properties of the glass transition when it happens at low temperatures. We also demonstrate that unusual behavior of water dynamics at low temperatures, including apparent fragile-to-strong crossover, can be ascribed to nuclear quantum effects.
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Affiliation(s)
- V N Novikov
- Department of Chemistry, University of Tennessee, 37996, Knoxville, TN, USA.
- Shull Wollan Center - Joint-Institute for Neutron Sciences, Oak Ridge National Laboratory and University of Tennessee, 37831, Oak Ridge, TN, USA.
- Institute of Automation and Electrometry, Russian Academy of Sciences, 630090, Novosibirsk, Russia.
| | - A P Sokolov
- Department of Chemistry, University of Tennessee, 37996, Knoxville, TN, USA
- Shull Wollan Center - Joint-Institute for Neutron Sciences, Oak Ridge National Laboratory and University of Tennessee, 37831, Oak Ridge, TN, USA
- Chemical Sciences Division, Oak Ridge National Laboratory, 37831, Oak Ridge, TN, USA
- Department of Physics and Astronomy, University of Tennessee, 37996, Knoxville, TN, USA
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38
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Finkelstein Y, Moreh R, Shang SL, Wang Y, Liu ZK. Quantum behavior of water nano-confined in beryl. J Chem Phys 2017; 146:124307. [PMID: 28388143 DOI: 10.1063/1.4978397] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
The proton mean kinetic energy, Ke(H), of water confined in nanocavities of beryl (Be3Al2Si6O18) at 5 K was obtained by simulating the partial vibrational density of states from density functional theory based first-principles calculations. The result, Ke(H) = 104.4 meV, is in remarkable agreement with the 5 K deep inelastic neutron scattering (DINS) measured value of 105 meV. This is in fact the first successful calculation that reproduces an anomalous DINS value regarding Ke(H) in nano-confined water. The calculation indicates that the vibrational states of the proton of the nano-confined water molecule distribute much differently than in ordinary H2O phases, most probably due to coupling with lattice modes of the hosting beryl nano-cage. These findings may be viewed as a promising step towards the resolution of the DINS controversial measurements on other H2O nano-confining systems, e.g., H2O confined in single and double walled carbon nanotubes.
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Affiliation(s)
- Y Finkelstein
- Nuclear Research Center-Negev, Beer-Sheva 84190, Israel
| | - R Moreh
- Physics Department, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
| | - S L Shang
- Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
| | - Y Wang
- Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
| | - Z K Liu
- Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
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39
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Guo J, Bian K, Lin Z, Jiang Y. Perspective: Structure and dynamics of water at surfaces probed by scanning tunneling microscopy and spectroscopy. J Chem Phys 2017; 145:160901. [PMID: 27802647 DOI: 10.1063/1.4964668] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The detailed and precise understanding of water-solid interaction largely relies on the development of atomic-scale experimental techniques, among which scanning tunneling microscopy (STM) has proven to be a noteworthy example. In this perspective, we review the recent advances of STM techniques in imaging, spectroscopy, and manipulation of water molecules. We discuss how those newly developed techniques are applied to probe the structure and dynamics of water at solid surfaces with single-molecule and even submolecular resolution, paying particular attention to the ability of accessing the degree of freedom of hydrogen. In the end, we present an outlook on the directions of future STM studies of water-solid interfaces as well as the challenges faced by this field. Some new scanning probe techniques beyond STM are also envisaged.
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Affiliation(s)
- Jing Guo
- International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, People's Republic of China
| | - Ke Bian
- International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, People's Republic of China
| | - Zeren Lin
- International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, People's Republic of China
| | - Ying Jiang
- International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, People's Republic of China
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40
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Belyanchikov MA, Zhukova ES, Tretiak S, Zhugayevych A, Dressel M, Uhlig F, Smiatek J, Fyta M, Thomas VG, Gorshunov BP. Vibrational states of nano-confined water molecules in beryl investigated by first-principles calculations and optical experiments. Phys Chem Chem Phys 2017; 19:30740-30748. [DOI: 10.1039/c7cp06472a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Using the DFT approach and optical spectroscopy, we provide a comprehensive analysis of IR excitation of water molecules confined in beryl nanopores.
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Affiliation(s)
- M. A. Belyanchikov
- Moscow Institute of Physics and Technology
- Dolgoprudny
- Moscow Region
- Russia
- 1. Physikalisches Institut
| | - E. S. Zhukova
- Moscow Institute of Physics and Technology
- Dolgoprudny
- Moscow Region
- Russia
| | - S. Tretiak
- Center for Integrated Nanotechnologies (CINT)
- Los Alamos National Laboratory
- Los Alamos
- USA
- Skolkovo Institute of Science and Technology
| | - A. Zhugayevych
- Skolkovo Institute of Science and Technology
- Moscow 143026
- Russia
| | - M. Dressel
- Moscow Institute of Physics and Technology
- Dolgoprudny
- Moscow Region
- Russia
- 1. Physikalisches Institut
| | - F. Uhlig
- Institute for Computational Physics
- Universität Stuttgart
- Germany
| | - J. Smiatek
- Institute for Computational Physics
- Universität Stuttgart
- Germany
| | - M. Fyta
- Institute for Computational Physics
- Universität Stuttgart
- Germany
| | - V. G. Thomas
- Sobolev Institute of Geology and Mineralogy
- RAS
- Russia
- Novosibirsk State University
- Novosibirsk 630090
| | - B. P. Gorshunov
- Moscow Institute of Physics and Technology
- Dolgoprudny
- Moscow Region
- Russia
- 1. Physikalisches Institut
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41
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Atomic Quantum Dynamics in Materials Research. ACTA ACUST UNITED AC 2017. [DOI: 10.1016/b978-0-12-805324-9.00007-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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42
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Arivazhagan V, Schmitz FD, Vullum PE, VAN Helvoort ATJ, Holst B. Atomic resolution imaging of beryl: an investigation of the nano-channel occupation. J Microsc 2016; 265:245-250. [PMID: 27809347 DOI: 10.1111/jmi.12493] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2016] [Accepted: 09/20/2016] [Indexed: 11/29/2022]
Abstract
Beryl in different varieties (emerald, aquamarine, heliodor etc.) displays a wide range of colours that have fascinated humans throughout history. Beryl is a hexagonal cyclo-silicate (ring-silicate) with channels going through the crystal along the c-axis. The channels are about 0.5 nm in diameter and can be occupied by water and alkali ions. Pure beryl (Be3 Al2 Si6 O18 ) is colourless (variety goshenite). The characteristic colours are believed to be mainly generated through substitutions with metal atoms in the lattice. Which atoms that are substituted is still debated it has been proposed that metal ions may also be enclosed in the channels and that this can also contribute to the crystal colouring. So far spectroscopy studies have not been able to fully answer this. Here we present the first experiments using atomic resolution scanning transmission electron microscope imaging (STEM) to investigate the channel occupation in beryl. We present images of a natural beryl crystal (variety heliodor) from the Bin Thuan Province in Vietnam. The channel occupation can be visualized. Based on the image contrast in combination with ex situ element analysis we suggest that some or all of the atoms that are visible in the channels are Fe ions.
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Affiliation(s)
- V Arivazhagan
- Department of Physics and Technology, University of Bergen, Bergen, Norway
| | - F D Schmitz
- German Gemmological Association, Idar-Oberstein, Germany.,Centre for Gemstone Research, FB 09 Institute for Geosciences, Johannes Gutenberg-University of Mainz, Mainz, Germany
| | - P E Vullum
- Department of Physics, Norwegian University of Science and Technology, Trondheim, Norway.,SINTEF Materials and Chemistry, Trondheim, Norway
| | - A T J VAN Helvoort
- Department of Physics, Norwegian University of Science and Technology, Trondheim, Norway
| | - B Holst
- Department of Physics and Technology, University of Bergen, Bergen, Norway
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43
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Incipient ferroelectricity of water molecules confined to nano-channels of beryl. Nat Commun 2016; 7:12842. [PMID: 27687693 PMCID: PMC5056440 DOI: 10.1038/ncomms12842] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2016] [Accepted: 08/08/2016] [Indexed: 01/24/2023] Open
Abstract
Water is characterized by large molecular electric dipole moments and strong interactions between molecules; however, hydrogen bonds screen the dipole–dipole coupling and suppress the ferroelectric order. The situation changes drastically when water is confined: in this case ordering of the molecular dipoles has been predicted, but never unambiguously detected experimentally. In the present study we place separate H2O molecules in the structural channels of a beryl single crystal so that they are located far enough to prevent hydrogen bonding, but close enough to keep the dipole–dipole interaction, resulting in incipient ferroelectricity in the water molecular subsystem. We observe a ferroelectric soft mode that causes Curie–Weiss behaviour of the static permittivity, which saturates below 10 K due to quantum fluctuations. The ferroelectricity of water molecules may play a key role in the functioning of biological systems and find applications in fuel and memory cells, light emitters and other nanoscale electronic devices. Ferroelectric orders hardly exist in liquid or ice state of water, despite its enormous molecular electrical polarizability. Here, Gorshunov et al. report incipient ferroelectricity in chains of interacting water molecules by placing them in the structural channels of a beryl crystal.
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44
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Ehlers G, Podlesnyak AA, Kolesnikov AI. The cold neutron chopper spectrometer at the Spallation Neutron Source-A review of the first 8 years of operation. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2016; 87:093902. [PMID: 27782573 DOI: 10.1063/1.4962024] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2016] [Accepted: 08/20/2016] [Indexed: 06/06/2023]
Abstract
The first eight years of operation of the Cold Neutron Chopper Spectrometer (CNCS) at the Spallation Neutron Source in Oak Ridge is being reviewed. The instrument has been part of the facility user program since 2009, and more than 250 individual user experiments have been performed to date. CNCS is an extremely powerful and versatile instrument and offers leading edge performance in terms of beam intensity, energy resolution, and flexibility to trade one for another. Experiments are being routinely performed with the sample at extreme conditions: T ≲ 0.05 K, p ≳ 2 GPa, and B = 8 T can be achieved individually or in combination. In particular, CNCS is in a position to advance the state of the art with inelastic neutron scattering under pressure, and some of the recent accomplishments in this area will be presented in more detail.
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Affiliation(s)
- G Ehlers
- Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - A A Podlesnyak
- Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - A I Kolesnikov
- Chemical and Engineering Materials Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
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45
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Affiliation(s)
- Y. Finkelstein
- Chemistry Department, Nuclear Research Center - Negev, Beer-Sheva 84190, Israel
| | - R. Moreh
- Physics Department, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
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