1
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Mohammadi H, Zeidler A, Youngman RE, Fischer HE, Salmon PS. Pressure dependent structure of amorphous magnesium aluminosilicates: The effect of replacing magnesia by alumina at the enstatite composition. J Chem Phys 2024; 160:064501. [PMID: 38341794 DOI: 10.1063/5.0189392] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Accepted: 01/07/2024] [Indexed: 02/13/2024] Open
Abstract
The effect of replacing magnesia by alumina on the pressure-dependent structure of amorphous enstatite was investigated by applying in situ high-pressure neutron diffraction with magnesium isotope substitution to glassy (MgO)0.375(Al2O3)0.125(SiO2)0.5. The replacement leads to a factor of 2.4 increase in the rate-of-change of the Mg-O coordination number with pressure, which increases from 4.76(4) at ambient pressure to 6.51(4) at 8.2 GPa, and accompanies a larger probability of magnesium finding bridging oxygen atoms as nearest-neighbors. The Al-O coordination number increases from 4.17(7) to 5.24(8) over the same pressure interval at a rate that increases when the pressure is above ∼3.5 GPa. On recovering the glass to ambient conditions, the Mg-O and Al-O coordination numbers reduce to 5.32(4) and 4.42(6), respectively. The Al-O value is in accordance with the results from solid-state 27Al nuclear magnetic resonance spectroscopy, which show the presence of six-coordinated aluminum species that are absent in the uncompressed material. These findings explain the appearance of distinct pressure-dependent structural transformation regimes in the preparation of permanently densified magnesium aluminosilicate glasses. They also indicate an anomalous minimum in the pressure dependence of the bulk modulus with an onset that suggests a pressure-dependent threshold for transitioning between scratch-resistant and crack-resistant material properties.
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Affiliation(s)
| | - Anita Zeidler
- Department of Physics, University of Bath, Bath BA2 7AY, United Kingdom
| | - Randall E Youngman
- Science and Technology Division, Corning Incorporated, Corning, New York 14831, USA
| | - Henry E Fischer
- Institut Laue Langevin, 71 Avenue des Martyrs, 38042 Grenoble Cedex 9, France
| | - Philip S Salmon
- Department of Physics, University of Bath, Bath BA2 7AY, United Kingdom
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2
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Legein C, Body M, Lhoste J, Li W, Charpentier T, Dambournet D. Synthesis, crystal structure and 19F NMR parameters modelling of CaTiF6(H2O)2 yielding to a revision of the bond-valence parameters for the Ti4+/F− ion pair. J SOLID STATE CHEM 2023. [DOI: 10.1016/j.jssc.2022.123793] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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3
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Mohammadi H, Mendes Da Silva R, Zeidler A, Gammond LVD, Gehlhaar F, de Oliveira M, Damasceno H, Eckert H, Youngman RE, Aitken BG, Fischer HE, Kohlmann H, Cormier L, Benmore CJ, Salmon PS. Structure of diopside, enstatite, and magnesium aluminosilicate glasses: A joint approach using neutron and x-ray diffraction and solid-state NMR. J Chem Phys 2022; 157:214503. [DOI: 10.1063/5.0125879] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022] Open
Abstract
Neutron diffraction with magnesium isotope substitution, high energy x-ray diffraction, and 29Si, 27Al, and 25Mg solid-state nuclear magnetic resonance (NMR) spectroscopy were used to measure the structure of glassy diopside (CaMgSi2O6), enstatite (MgSiO3), and four (MgO) x(Al2O3) y(SiO2)1−x−y glasses, with x = 0.375 or 0.25 along the 50 mol. % silica tie-line (1 − x − y = 0.5) or with x = 0.3 or 0.2 along the 60 mol. % silica tie-line (1 − x − y = 0.6). The bound coherent neutron scattering length of the isotope 25Mg was remeasured, and the value of 3.720(12) fm was obtained from a Rietveld refinement of the powder diffraction patterns measured for crystalline 25MgO. The diffraction results for the glasses show a broad asymmetric distribution of Mg–O nearest-neighbors with a coordination number of 4.40(4) and 4.46(4) for the diopside and enstatite glasses, respectively. As magnesia is replaced by alumina along a tie-line with 50 or 60 mol. % silica, the Mg–O coordination number increases with the weighted bond distance as less Mg2+ ions adopt a network-modifying role and more of these ions adopt a predominantly charge-compensating role. 25Mg magic angle spinning (MAS) NMR results could not resolve the different coordination environments of Mg2+ under the employed field strength (14.1 T) and spinning rate (20 kHz). The results emphasize the power of neutron diffraction with isotope substitution to provide unambiguous site-specific information on the coordination environment of magnesium in disordered materials.
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Affiliation(s)
| | | | - Anita Zeidler
- Department of Physics, University of Bath, Bath BA2 7AY, United Kingdom
| | | | - Florian Gehlhaar
- Institut Laue Langevin, 71 Avenue des Martyrs, 38042 Grenoble Cedex 9, France
- Institut für Anorganische Chemie, Universität Leipzig, Johannisallee 29, 04103 Leipzig, Germany
| | - Marcos de Oliveira
- Instituto de Física de São Carlos, Universidade de São Paulo, CP 369, São Carlos SP 13566-590, SP, Brazil
| | - Hugo Damasceno
- Instituto de Física de São Carlos, Universidade de São Paulo, CP 369, São Carlos SP 13566-590, SP, Brazil
| | - Hellmut Eckert
- Instituto de Física de São Carlos, Universidade de São Paulo, CP 369, São Carlos SP 13566-590, SP, Brazil
- Institut für Physikalische Chemie, WWU Münster, Corrensstraße 30, D48149 Münster, Germany
| | - Randall E. Youngman
- Science and Technology Division, Corning Incorporated, Corning, New York 14831, USA
| | - Bruce G. Aitken
- Science and Technology Division, Corning Incorporated, Corning, New York 14831, USA
| | - Henry E. Fischer
- Institut Laue Langevin, 71 Avenue des Martyrs, 38042 Grenoble Cedex 9, France
| | - Holger Kohlmann
- Institut für Anorganische Chemie, Universität Leipzig, Johannisallee 29, 04103 Leipzig, Germany
| | - Laurent Cormier
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC), Sorbonne Université, CNRS UMR 7590, Muséum National d’Histoire Naturelle, IRD UMR 206, 4 place Jussieu, 75005 Paris, France
| | - Chris J. Benmore
- X-Ray Science Division, Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, Illinois 60439, USA
| | - Philip S. Salmon
- Department of Physics, University of Bath, Bath BA2 7AY, United Kingdom
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4
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Li H, Karina A, Ladd-Parada M, Späh A, Perakis F, Benmore C, Amann-Winkel K. Long-Range Structures of Amorphous Solid Water. J Phys Chem B 2021; 125:13320-13328. [PMID: 34846876 PMCID: PMC8667042 DOI: 10.1021/acs.jpcb.1c06899] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
![]()
High-energy X-ray
diffraction (XRD) and Fourier transform infrared
spectroscopy (FTIR) of amorphous solid water (ASW) were studied during
vapor deposition and the heating process. From the diffraction patterns,
the oxygen–oxygen pair distribution functions (PDFs) were calculated
up to the eighth coordination shell and an r = 23 Å. The PDF of ASW obtained both during vapor deposition
at 80 K as well as the subsequent heating are consistent with that
of low-density amorphous ice. The formation and temperature-induced
collapse of micropores were observed in the XRD data and in the FTIR
measurements, more specifically, in the OH stretch and the dangling
mode. Above 140 K, ASW crystallizes into a stacking disordered ice,
Isd. It is observed that the fourth, fifth, and sixth peaks
in the PDF, corresponding to structural arrangements between 8 and
12 Å, are the most sensitive to the onset of crystallization.
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Affiliation(s)
- Hailong Li
- Department of Physics, AlbaNova University Center, Stockholm University, Stockholm SE-10691, Sweden
| | - Aigerim Karina
- Department of Physics, AlbaNova University Center, Stockholm University, Stockholm SE-10691, Sweden
| | - Marjorie Ladd-Parada
- Department of Physics, AlbaNova University Center, Stockholm University, Stockholm SE-10691, Sweden
| | - Alexander Späh
- Department of Physics, AlbaNova University Center, Stockholm University, Stockholm SE-10691, Sweden
| | - Fivos Perakis
- Department of Physics, AlbaNova University Center, Stockholm University, Stockholm SE-10691, Sweden
| | - Chris Benmore
- X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Katrin Amann-Winkel
- Department of Physics, AlbaNova University Center, Stockholm University, Stockholm SE-10691, Sweden
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5
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Polidori A, Rowlands RF, Zeidler A, Salanne M, Fischer HE, Annighöfer B, Klotz S, Salmon PS. Structure and dynamics of aqueous NaCl solutions at high temperatures and pressures. J Chem Phys 2021; 155:194506. [PMID: 34800945 DOI: 10.1063/5.0067166] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The structure of a concentrated solution of NaCl in D2O was investigated by in situ high-pressure neutron diffraction with chlorine isotope substitution to give site-specific information on the coordination environment of the chloride ion. A broad range of densities was explored by first increasing the temperature from 323 to 423 K at 0.1 kbar and then increasing the pressure from 0.1 to 33.8 kbar at 423 K, thus mapping a cyclic variation in the static dielectric constant of the pure solvent. The experimental work was complemented by molecular dynamics simulations using the TIP4P/2005 model for water, which were validated against the measured equation of state and diffraction results. Pressure-induced anion ordering is observed, which is accompanied by a dramatic increase in the Cl-O and O-O coordination numbers. With the aid of bond-distance resolved bond-angle maps, it is found that the increased coordination numbers do not originate from a sizable alteration to the number of either Cl⋯D-O or O⋯D-O hydrogen bonds but from the appearance of non-hydrogen-bonded configurations. Increased pressure leads to a marked decrease in the self-diffusion coefficients but has only a moderate effect on the ion-water residence times. Contact ion pairs are observed under all conditions, mostly in the form of charge-neutral NaCl0 units, and coexist with solvent-separated Na+-Na+ and Cl--Cl- ion pairs. The exchange of water molecules with Na+ adopts a concerted mechanism under ambient conditions but becomes non-concerted as the state conditions are changed. Our findings are important for understanding the role of extreme conditions in geochemical processes.
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Affiliation(s)
- Annalisa Polidori
- Department of Physics, University of Bath, Bath BA2 7AY, United Kingdom
| | - Ruth F Rowlands
- Department of Physics, University of Bath, Bath BA2 7AY, United Kingdom
| | - Anita Zeidler
- Department of Physics, University of Bath, Bath BA2 7AY, United Kingdom
| | - Mathieu Salanne
- Sorbonne Université, CNRS, Physico-Chimie des Électrolytes et Nanosystèmes Interfaciaux, F-75005 Paris, France
| | - Henry E Fischer
- Institut Laue Langevin, 71 Avenue des Martyrs, 38042 Grenoble Cedex 9, France
| | - Burkhard Annighöfer
- Université Paris-Saclay, Laboratoire Léon Brillouin, CEA-CNRS, Saclay, 91191 Gif-sur-Yvette Cedex, France
| | - Stefan Klotz
- Sorbonne Université, UMR 7590, IMPMC, F-75252 Paris, France
| | - Philip S Salmon
- Department of Physics, University of Bath, Bath BA2 7AY, United Kingdom
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6
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Zhang C, Tang F, Chen M, Xu J, Zhang L, Qiu DY, Perdew JP, Klein ML, Wu X. Modeling Liquid Water by Climbing up Jacob's Ladder in Density Functional Theory Facilitated by Using Deep Neural Network Potentials. J Phys Chem B 2021; 125:11444-11456. [PMID: 34533960 DOI: 10.1021/acs.jpcb.1c03884] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Within the framework of Kohn-Sham density functional theory (DFT), the ability to provide good predictions of water properties by employing a strongly constrained and appropriately normed (SCAN) functional has been extensively demonstrated in recent years. Here, we further advance the modeling of water by building a more accurate model on the fourth rung of Jacob's ladder with the hybrid functional, SCAN0. In particular, we carry out both classical and Feynman path-integral molecular dynamics calculations of water with the SCAN0 functional and the isobaric-isothermal ensemble. To generate the equilibrated structure of water, a deep neural network potential is trained from the atomic potential energy surface based on ab initio data obtained from SCAN0 DFT calculations. For the electronic properties of water, a separate deep neural network potential is trained by using the Deep Wannier method based on the maximally localized Wannier functions of the equilibrated trajectory at the SCAN0 level. The structural, dynamic, and electric properties of water were analyzed. The hydrogen-bond structures, density, infrared spectra, diffusion coefficients, and dielectric constants of water, in the electronic ground state, are computed by using a large simulation box and long simulation time. For the properties involving electronic excitations, we apply the GW approximation within many-body perturbation theory to calculate the quasiparticle density of states and bandgap of water. Compared to the SCAN functional, mixing exact exchange mitigates the self-interaction error in the meta-generalized-gradient approximation and further softens liquid water toward the experimental direction. For most of the water properties, the SCAN0 functional shows a systematic improvement over the SCAN functional. However, some important discrepancies remain. The H-bond network predicted by the SCAN0 functional is still slightly overstructured compared to the experimental results.
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Affiliation(s)
- Chunyi Zhang
- Department of Physics, Temple University, Philadelphia, Pennsylvania 19122, United States
| | - Fujie Tang
- Department of Physics, Temple University, Philadelphia, Pennsylvania 19122, United States
| | - Mohan Chen
- HEDPS, Center for Applied Physics and Technology, College of Engineering, Peking University, Beijing 100871, China
| | - Jianhang Xu
- Department of Physics, Temple University, Philadelphia, Pennsylvania 19122, United States
| | - Linfeng Zhang
- Program in Applied and Computational Mathematics, Princeton University, Princeton, New Jersey 08544, United States
| | - Diana Y Qiu
- Department of Mechanical Engineering and Materials Science, Yale University, New Haven, Connecticut 06520, United States
| | - John P Perdew
- Department of Physics, Temple University, Philadelphia, Pennsylvania 19122, United States.,Department of Chemistry, Temple University, Philadelphia, Pennsylvania 19122, United States
| | - Michael L Klein
- Department of Physics, Temple University, Philadelphia, Pennsylvania 19122, United States.,Institute for Computational Molecular Science, Temple University, Philadelphia, Pennsylvania 19122, United States
| | - Xifan Wu
- Department of Physics, Temple University, Philadelphia, Pennsylvania 19122, United States
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7
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Kameda Y, Kowaguchi M, Tsutsui K, Amo Y, Usuki T, Ikeda K, Otomo T. Experimental Determination of Relationship between Intramolecular O-D Bond Length and Its Stretching Vibrational Frequency of D 2O Molecule in the Liquid State. J Phys Chem B 2021; 125:11285-11291. [PMID: 34605237 DOI: 10.1021/acs.jpcb.1c07527] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Experimental evidence has been obtained for the structure-spectra relationship of hydrogen bonds in aqueous solutions. Intramolecular O-D distance, rOD, has been determined by the least-squares fitting analysis of the neutron interference term in the high-Q region observed for pure D2O and concentrated aqueous solutions. The average O-D stretching frequency, νOD, has been obtained from the position of the center of gravity of the observed ATR-IR O-D stretching band. The linear relationship between rOD and νOD has been confirmed in the liquid state. The slope of dνOD/drOD is evaluated to be -21 000 ± 1000 cm-1 Å-1.
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Affiliation(s)
- Yasuo Kameda
- Department of Material and Biological Chemistry, Faculty of Science, Yamagata University, 1-4-12, Kojirakawa-machi, Yamagata City, Yamagata 990-8560, Japan
| | - Misaki Kowaguchi
- Department of Material and Biological Chemistry, Faculty of Science, Yamagata University, 1-4-12, Kojirakawa-machi, Yamagata City, Yamagata 990-8560, Japan
| | - Kana Tsutsui
- Department of Material and Biological Chemistry, Faculty of Science, Yamagata University, 1-4-12, Kojirakawa-machi, Yamagata City, Yamagata 990-8560, Japan
| | - Yuko Amo
- Department of Material and Biological Chemistry, Faculty of Science, Yamagata University, 1-4-12, Kojirakawa-machi, Yamagata City, Yamagata 990-8560, Japan
| | - Takeshi Usuki
- Department of Material and Biological Chemistry, Faculty of Science, Yamagata University, 1-4-12, Kojirakawa-machi, Yamagata City, Yamagata 990-8560, Japan
| | - Kazutaka Ikeda
- Institute of Material Structure Science, KEK, Tsukuba, Ibaraki 305-080, Japan
| | - Toshiya Otomo
- Institute of Material Structure Science, KEK, Tsukuba, Ibaraki 305-080, Japan
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8
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Gammond LVD, Auer H, Mendes Da Silva R, Zeidler A, Ortiz-Mosquera JF, Nieto-Muñoz AM, Rodrigues ACM, d'Anciães Almeida Silva I, Eckert H, Benmore CJ, Salmon PS. Structure of crystalline and amorphous materials in the NASICON system Na 1+xAl xGe 2-x(PO 4) 3. J Chem Phys 2021; 155:074501. [PMID: 34418933 DOI: 10.1063/5.0049399] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The structure of crystalline and amorphous materials in the sodium (Na) super-ionic conductor system Na1+xAlxGe2-x(PO4)3 with x = 0, 0.4, and 0.8 was investigated by combining (i) neutron and x-ray powder diffraction and pair-distribution function analysis with (ii) 27Al and 31P magic angle spinning (MAS) and 31P/23Na double-resonance nuclear magnetic resonance (NMR) spectroscopy. A Rietveld analysis of the powder diffraction patterns shows that the x = 0 and x = 0.4 compositions crystallize into space group-type R3̄, whereas the x = 0.8 composition crystallizes into space group-type R3̄c. For the as-prepared glass, the pair-distribution functions and 27Al MAS NMR spectra show the formation of sub-octahedral Ge and Al centered units, which leads to the creation of non-bridging oxygen (NBO) atoms. The influence of these atoms on the ion mobility is discussed. When the as-prepared glass is relaxed by thermal annealing, there is an increase in the Ge and Al coordination numbers that leads to a decrease in the fraction of NBO atoms. A model is proposed for the x = 0 glass in which super-structural units containing octahedral Ge(6) and tetrahedral P(3) motifs are embedded in a matrix of tetrahedral Ge(4) units, where superscripts denote the number of bridging oxygen atoms. The super-structural units can grow in size by a reaction in which NBO atoms on the P(3) motifs are used to convert Ge(4) to Ge(6) units. The resultant P(4) motifs thereby provide the nucleation sites for crystal growth via a homogeneous nucleation mechanism.
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Affiliation(s)
| | - Henry Auer
- Fraunhofer Institute for Ceramic Technologies and Systems IKTS, Winterbergstraße 28, 01277 Dresden, Germany
| | | | - Anita Zeidler
- Department of Physics, University of Bath, Bath BA2 7AY, United Kingdom
| | - Jairo F Ortiz-Mosquera
- Universidade Federal de São Carlos, Programa de P¢s-Graduaåão em Ciæncia e Engenharia de Materiais, CP 676, 13565-905 São Carlos, SP, Brazil
| | - Adriana M Nieto-Muñoz
- Universidade Federal de São Carlos, Programa de P¢s-Graduaåão em Ciæncia e Engenharia de Materiais, CP 676, 13565-905 São Carlos, SP, Brazil
| | - Ana Candida M Rodrigues
- Departamento de Engenharia de Materiais, Universidade Federal de São Carlos, CP 676, 13565-905 São Carlos, SP, Brazil
| | | | - Hellmut Eckert
- Instituto de Física de São Carlos, Universidade de São Paulo, CP 369, São Carlos SP 13566-590, SP, Brazil
| | - Chris J Benmore
- X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, Illinois 60439, USA
| | - Philip S Salmon
- Department of Physics, University of Bath, Bath BA2 7AY, United Kingdom
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9
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Bakó I, Madarász Á, Pusztai L. Nuclear quantum effects: Their relevance in neutron diffraction studies of liquid water. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2020.115192] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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10
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Agarwal R, Smith MD, Smith JC. Capturing Deuteration Effects in a Molecular Mechanics Force Field: Deuterated THF and the THF-Water Miscibility Gap. J Chem Theory Comput 2020; 16:2529-2540. [PMID: 32175738 DOI: 10.1021/acs.jctc.9b01138] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Deuteration is a common chemical modification used in conjunction with experiments such as neutron scattering, NMR, and Fourier-transform infrared for the study of molecular systems. Under the Born-Oppenheimer (BO) approximation, while the underlying potential energy surface remains unchanged by isotopic substitutions, isotopic substitution still alters intramolecular vibrations, which in turn may alter intermolecular interactions. Molecular mechanics (MM) force fields used in classical molecular dynamics simulations are assumed to represent local approximations of the BO potential energy surfaces, and hence, MD simulations using simple isotopic mass substitutions should capture BO-compatible isotope effects. However, standard MM force-field parameterizations do not directly fit to the local harmonic quantum mechanical (QM) Hessian that describes the BO surface, but rather to QM normal-modes and/or mass-dependent internal-coordinate derived distortion energies. Here, using tetrahydrofuran (THF)-water mixtures as our model system, we show that not only does a simple mass-substitution approach fail to capture an experimentally characterized deuteration effect (the loss of the closed-loop miscibility gap associated with the complete deuteration of THF) but also it is necessary to generate new MM force-field parameters that correctly describe isotopic dependent vibrations to capture the experimental deuteration effect. We show that the origin of this failure is a result of using mass-dependent features to fit the THF MM force field, which unintentionally biases the bonded terms of the force field to represent only the isotopologue used during the original force-field parameterization. In addition, we make use of our isotopologue-corrected force field for D8THF to examine the molecular origins of the isotope-dependent loss of the THF-water miscibility gap.
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Affiliation(s)
- Rupesh Agarwal
- UT/ORNL Center for Molecular Biophysics, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6309, United States.,Graduate School of Genome Science and Technology, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Micholas Dean Smith
- UT/ORNL Center for Molecular Biophysics, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6309, United States.,Department of Biochemistry and Cellular and Molecular Biology, University of Tennessee, Knoxville, Tennessee 37996, United States
| | - Jeremy C Smith
- UT/ORNL Center for Molecular Biophysics, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6309, United States.,Department of Biochemistry and Cellular and Molecular Biology, University of Tennessee, Knoxville, Tennessee 37996, United States
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11
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Ko HY, Zhang L, Santra B, Wang H, E W, DiStasio Jr RA, Car R. Isotope effects in liquid water via deep potential molecular dynamics. Mol Phys 2019. [DOI: 10.1080/00268976.2019.1652366] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Hsin-Yu Ko
- Department of Chemistry, Princeton University, Princeton, NJ, USA
| | - Linfeng Zhang
- Program in Applied and Computational Mathematics, Princeton University, Princeton, NJ, USA
| | - Biswajit Santra
- Department of Physics, Temple University, Philadelphia, PA, USA
| | - Han Wang
- Laboratory of Computational Physics, Institute of Applied Physics and Computational Mathematics, Beijing, People's Republic of China
| | - Weinan E
- Program in Applied and Computational Mathematics, Princeton University, Princeton, NJ, USA
- Department of Mathematics, Princeton University, Princeton, NJ, USA
| | | | - Roberto Car
- Department of Chemistry, Princeton University, Princeton, NJ, USA
- Program in Applied and Computational Mathematics, Princeton University, Princeton, NJ, USA
- Department of Physics and Princeton Institute for the Science and Technology of Materials, Princeton University, Princeton, NJ, USA
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12
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Clark T, Heske J, Kühne TD. Opposing Electronic and Nuclear Quantum Effects on Hydrogen Bonds in H 2 O and D 2 O. Chemphyschem 2019; 20:2461-2465. [PMID: 31449714 PMCID: PMC6790677 DOI: 10.1002/cphc.201900839] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2019] [Indexed: 11/09/2022]
Abstract
The effect of extending the O-H bond length(s) in water on the hydrogen-bonding strength has been investigated using static ab initio molecular orbital calculations. The "polar flattening" effect that causes a slight σ-hole to form on hydrogen atoms is strengthened when the bond is stretched, so that the σ-hole becomes more positive and hydrogen bonding stronger. In opposition to this electronic effect, path-integral ab initio molecular-dynamics simulations show that the nuclear quantum effect weakens the hydrogen bond in the water dimer. Thus, static electronic effects strengthen the hydrogen bond in H2 O relative to D2 O, whereas nuclear quantum effects weaken it. These quantum fluctuations are stronger for the water dimer than in bulk water.
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Affiliation(s)
- Timothy Clark
- Computer-Chemie-Centrum, Department Chemie und PharmazieFriedrich-Alexander-Universität Erlangen-NürnbergNägelsbachstr. 2591052ErlangenGermany
| | - Julian Heske
- Chair of Theoretical Chemistry, Dynamics of Condensed Matter, Department of ChemistryUniversity of PaderbornWarburger Str. 10033098PaderbornGermany
| | - Thomas D. Kühne
- Chair of Theoretical Chemistry, Dynamics of Condensed Matter, Department of ChemistryUniversity of PaderbornWarburger Str. 10033098PaderbornGermany
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13
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Kameda Y, Amo Y, Usuki T, Umebayashi Y, Ikeda K, Otomo T. Neutron Diffraction Study on Partial Pair Correlation Functions of Water at Ambient Temperature. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2018. [DOI: 10.1246/bcsj.20180205] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Yasuo Kameda
- Department of Material and Biological Chemistry, Faculty of Science, Yamagata University, Yamagata 990-8560, Japan
| | - Yuko Amo
- Department of Material and Biological Chemistry, Faculty of Science, Yamagata University, Yamagata 990-8560, Japan
| | - Takeshi Usuki
- Department of Material and Biological Chemistry, Faculty of Science, Yamagata University, Yamagata 990-8560, Japan
| | - Yasuhiro Umebayashi
- Graduate School of Science and Technology, Niigata University, Niigata 950-2181, Japan
| | - Kazutaka Ikeda
- Institute of Material Structure Science, KEK, Tsukuba, Ibaraki 305-080, Japan
| | - Toshiya Otomo
- Institute of Material Structure Science, KEK, Tsukuba, Ibaraki 305-080, Japan
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14
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Mariedahl D, Perakis F, Späh A, Pathak H, Kim KH, Camisasca G, Schlesinger D, Benmore C, Pettersson LGM, Nilsson A, Amann-Winkel K. X-ray Scattering and O-O Pair-Distribution Functions of Amorphous Ices. J Phys Chem B 2018; 122:7616-7624. [PMID: 30036063 PMCID: PMC6095636 DOI: 10.1021/acs.jpcb.8b04823] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
![]()
The
structure factor and oxygen–oxygen pair-distribution functions
of amorphous ices at liquid nitrogen temperature (T = 77 K) have been derived from wide-angle X-ray scattering (WAXS)
up to interatomic distances of r = 23 Å, where
local structure differences between the amorphous ices can be seen
for the entire range. The distances to the first coordination shell
for low-, high-, and very-high-density amorphous ice (LDA, HDA, VHDA)
were determined to be 2.75, 2.78, and 2.80 Å, respectively, with
high accuracy due to measurements up to a large momentum transfer
of 23 Å–1. Similarities in pair-distribution
functions between LDA and supercooled water at 254.1 K, HDA and liquid
water at 365.9 K, and VHDA and high-pressure liquid water were found
up to around 8 Å, but beyond that at longer distances, the similarities
were lost. In addition, the structure of the high-density amorphous
ices was compared to high-pressure crystalline ices IV, IX , and XII,
and conclusions were drawn about the local ordering.
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Affiliation(s)
- Daniel Mariedahl
- Department of Physics , AlbaNova University Center, Stockholm University , SE-10691 Stockholm , Sweden
| | - Fivos Perakis
- Department of Physics , AlbaNova University Center, Stockholm University , SE-10691 Stockholm , Sweden
| | - Alexander Späh
- Department of Physics , AlbaNova University Center, Stockholm University , SE-10691 Stockholm , Sweden
| | - Harshad Pathak
- Department of Physics , AlbaNova University Center, Stockholm University , SE-10691 Stockholm , Sweden
| | - Kyung Hwan Kim
- Department of Physics , AlbaNova University Center, Stockholm University , SE-10691 Stockholm , Sweden
| | - Gaia Camisasca
- Department of Physics , AlbaNova University Center, Stockholm University , SE-10691 Stockholm , Sweden
| | | | - Chris Benmore
- X-ray Science Division, Advanced Photon Source , Argonne National Laboratory , Argonne , Illinois 60439 , United States
| | | | - Anders Nilsson
- Department of Physics , AlbaNova University Center, Stockholm University , SE-10691 Stockholm , Sweden
| | - Katrin Amann-Winkel
- Department of Physics , AlbaNova University Center, Stockholm University , SE-10691 Stockholm , Sweden
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15
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Gaiduk AP, Gustafson J, Gygi F, Galli G. First-Principles Simulations of Liquid Water Using a Dielectric-Dependent Hybrid Functional. J Phys Chem Lett 2018; 9:3068-3073. [PMID: 29768015 DOI: 10.1021/acs.jpclett.8b01017] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We carried out first-principles simulations of liquid water under ambient conditions using a dielectric-dependent hybrid functional, where the fraction of exact exchange is set equal to the inverse of the high-frequency dielectric constant of the liquid. We found excellent agreement with experiment for the oxygen-oxygen partial correlation function at the experimental equilibrium density and 311 ± 3 K. Other structural and dynamical properties, such as the diffusion coefficient, molecular dipole moments, and vibrational spectra, are also in good agreement with experiment. Our results, together with previous findings on electronic properties of the liquid with the same functional, show that the dielectric-dependent hybrid functional accurately describes both the structural and electronic properties of liquid water.
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Affiliation(s)
- Alex P Gaiduk
- Institute for Molecular Engineering , The University of Chicago , Chicago , Illinois 60637 , United States
- Materials Science Division , Argonne National Laboratory , Argonne , Illinois 60439 , United States
| | - Jeffrey Gustafson
- Department of Chemistry , The University of Chicago , Chicago , Illinois 60637 , United States
| | - François Gygi
- Department of Computer Science , University of California , Davis , California 95616 , United States
| | - Giulia Galli
- Institute for Molecular Engineering , The University of Chicago , Chicago , Illinois 60637 , United States
- Materials Science Division , Argonne National Laboratory , Argonne , Illinois 60439 , United States
- Department of Chemistry , The University of Chicago , Chicago , Illinois 60637 , United States
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16
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Unravelling the influence of quantum proton delocalization on electronic charge transfer through the hydrogen bond. Chem Phys Lett 2017. [DOI: 10.1016/j.cplett.2017.04.034] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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17
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Pethes I, Pusztai L. Reverse Monte Carlo modeling of liquid water with the explicit use of the SPC/E interatomic potential. J Chem Phys 2017; 146:064506. [DOI: 10.1063/1.4975987] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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18
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Rick SW. A polarizable, charge transfer model of water using the drude oscillator. J Comput Chem 2016; 37:2060-6. [DOI: 10.1002/jcc.24426] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2015] [Revised: 04/14/2016] [Accepted: 05/17/2016] [Indexed: 12/24/2022]
Affiliation(s)
- Steven W. Rick
- Department of ChemistryUniversity of New OrleansNew Orleans70148 Los Angeles
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19
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Fang W, Chen J, Rossi M, Feng Y, Li XZ, Michaelides A. Inverse Temperature Dependence of Nuclear Quantum Effects in DNA Base Pairs. J Phys Chem Lett 2016; 7:2125-31. [PMID: 27195654 PMCID: PMC4933496 DOI: 10.1021/acs.jpclett.6b00777] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Despite the inherently quantum mechanical nature of hydrogen bonding, it is unclear how nuclear quantum effects (NQEs) alter the strengths of hydrogen bonds. With this in mind, we use ab initio path integral molecular dynamics to determine the absolute contribution of NQEs to the binding in DNA base pair complexes, arguably the most important hydrogen-bonded systems of all. We find that depending on the temperature, NQEs can either strengthen or weaken the binding within the hydrogen-bonded complexes. As a somewhat counterintuitive consequence, NQEs can have a smaller impact on hydrogen bond strengths at cryogenic temperatures than at room temperature. We rationalize this in terms of a competition of NQEs between low-frequency and high-frequency vibrational modes. Extending this idea, we also propose a simple model to predict the temperature dependence of NQEs on hydrogen bond strengths in general.
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Affiliation(s)
- Wei Fang
- Thomas Young Centre, London Centre for Nanotechnology, Department of Chemistry, and Department of
Physics and Astronomy, University College
London, London WC1E 6BT, United Kingdom
| | - Ji Chen
- Thomas Young Centre, London Centre for Nanotechnology, Department of Chemistry, and Department of
Physics and Astronomy, University College
London, London WC1E 6BT, United Kingdom
| | - Mariana Rossi
- Physical
and Theoretical Chemistry Lab, University
of Oxford, South Parks
Road, OX1 3QZ Oxford, United Kingdom
| | - Yexin Feng
- School
of Physics and Electronics, Hunan University, Changsha 410082, People’s Republic of China
| | - Xin-Zheng Li
- International
Center for Quantum Materials, School of Physics and Collaborative
Innovation Center of Quantum Matter, Peking
University, Beijing 100871, People’s Republic of China
- E-mail: (X.-Z.L.)
| | - Angelos Michaelides
- Thomas Young Centre, London Centre for Nanotechnology, Department of Chemistry, and Department of
Physics and Astronomy, University College
London, London WC1E 6BT, United Kingdom
- E-mail: (A.M.)
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20
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Amann-Winkel K, Bellissent-Funel MC, Bove LE, Loerting T, Nilsson A, Paciaroni A, Schlesinger D, Skinner L. X-ray and Neutron Scattering of Water. Chem Rev 2016; 116:7570-89. [DOI: 10.1021/acs.chemrev.5b00663] [Citation(s) in RCA: 137] [Impact Index Per Article: 17.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Katrin Amann-Winkel
- Department
of Physics, AlbaNova University Center, Stockholm University, SE-106
91, Stockholm, Sweden
| | | | - Livia E. Bove
- IMPMC, CNRS-UMR 7590, Université P&M Curie, 75252 Paris, France
- Institute
of Condensed Matter Physics, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - Thomas Loerting
- Institute
of Physical Chemistry, University of Innsbruck, 6020 Innsbruck, Austria
| | - Anders Nilsson
- Department
of Physics, AlbaNova University Center, Stockholm University, SE-106
91, Stockholm, Sweden
| | - Alessandro Paciaroni
- Dipartimento
di Fisica e Geologia, Università di Perugia, Via Alessandro
Pascoli, I-06123 Perugia, Italy
| | - Daniel Schlesinger
- Department
of Physics, AlbaNova University Center, Stockholm University, SE-106
91, Stockholm, Sweden
| | - Lawrie Skinner
- Mineral
Physics Institute, Stony Brook University, Stony Brook, New York 11794-2100, United States
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21
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Ceriotti M, Fang W, Kusalik PG, McKenzie RH, Michaelides A, Morales MA, Markland TE. Nuclear Quantum Effects in Water and Aqueous Systems: Experiment, Theory, and Current Challenges. Chem Rev 2016; 116:7529-50. [DOI: 10.1021/acs.chemrev.5b00674] [Citation(s) in RCA: 339] [Impact Index Per Article: 42.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Michele Ceriotti
- Laboratory
of Computational Science and Modeling, Institute of Materials, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
| | - Wei Fang
- Thomas
Young Centre, London Centre for Nanotechnology and Department of Physics
and Astronomy, University College London, London WC1E 6BT, United Kingdom
| | - Peter G. Kusalik
- Department
of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Alberta T2N 1N4, Canada
| | - Ross H. McKenzie
- School
of Mathematics and Physics, University of Queensland, Brisbane, 4072 Queensland Australia
| | - Angelos Michaelides
- Thomas
Young Centre, London Centre for Nanotechnology and Department of Physics
and Astronomy, University College London, London WC1E 6BT, United Kingdom
| | - Miguel A. Morales
- Lawrence Livermore National Laboratory, Livermore, California 94550, United States
| | - Thomas E. Markland
- Department
of Chemistry, Stanford University, 333 Campus Drive, Stanford, California 94305, United States
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22
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Adjei-Acheamfour M, Tilly JF, Beerwerth J, Böhmer R. Water dynamics on ice and hydrate lattices studied by second-order central-line stimulated-echo oxygen-17 nuclear magnetic resonance. J Chem Phys 2015; 143:214201. [DOI: 10.1063/1.4936416] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Affiliation(s)
| | - Julius F. Tilly
- Fakultät Physik, Technische Universität Dortmund, 44221 Dortmund, Germany
| | - Joachim Beerwerth
- Fakultät Physik, Technische Universität Dortmund, 44221 Dortmund, Germany
| | - Roland Böhmer
- Fakultät Physik, Technische Universität Dortmund, 44221 Dortmund, Germany
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23
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Reverse Monte Carlo investigations concerning recent isotopic substitution neutron diffraction data on liquid water. J Mol Liq 2015. [DOI: 10.1016/j.molliq.2015.08.050] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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24
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Abstract
In a typical X-ray diffraction experiment, the elastically scattered intensity, I(Q), is the experimental observable. I(Q) contains contributions from both intramolecular as well as intermolecular correlations embodied in the scattering factors, HOO(Q) and HOH(Q), with negligible contributions from HHH(Q). Thus, to accurately define the oxygen-oxygen radial distribution function, gOO(r), a model of the electron density is required to accurately weigh the HOO(Q) component relative to the intramolecular and oxygen-hydrogen correlations from the total intensity observable. In this work, we carefully define the electron density model and its underlying assumptions and more explicitly utilize two restraints on the allowable gOO(r) functions, which must conform to both very low experimental errors at high Q and the need to satisfy the isothermal compressibility at low Q. Although highly restrained by these conditions, the underdetermined nature of the problem is such that we present a family of gOO(r) values that provide equally good agreement with the high-Q intensity and compressibility restraints and with physically correct behavior at small r.
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Affiliation(s)
- David H Brookes
- †Department of Chemistry, ‡Department of Bioengineering, §Department of Chemical and Biomolecular Engineering, and ∥Chemical Sciences Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720, United States
| | - Teresa Head-Gordon
- †Department of Chemistry, ‡Department of Bioengineering, §Department of Chemical and Biomolecular Engineering, and ∥Chemical Sciences Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720, United States
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25
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Skinner LB, Benmore CJ, Neuefeind JC, Parise JB. The structure of water around the compressibility minimum. J Chem Phys 2015; 141:214507. [PMID: 25481152 DOI: 10.1063/1.4902412] [Citation(s) in RCA: 103] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Here we present diffraction data that yield the oxygen-oxygen pair distribution function, g(OO)(r) over the range 254.2-365.9 K. The running O-O coordination number, which represents the integral of the pair distribution function as a function of radial distance, is found to exhibit an isosbestic point at 3.30(5) Å. The probability of finding an oxygen atom surrounding another oxygen at this distance is therefore shown to be independent of temperature and corresponds to an O-O coordination number of 4.3(2). Moreover, the experimental data also show a continuous transition associated with the second peak position in g(OO)(r) concomitant with the compressibility minimum at 319 K.
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Affiliation(s)
- L B Skinner
- X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - C J Benmore
- X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - J C Neuefeind
- Spallation Neutron Source, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37922, USA
| | - J B Parise
- Mineral Physics Institute, Stony Brook University, Stony Brook, New York, New York 11794-2100, USA
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26
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Kirichek O, Soper A, Dzyuba B, Callear S, Fuller B. Strong isotope effects on melting dynamics and ice crystallisation processes in cryo vitrification solutions. PLoS One 2015; 10:e0120611. [PMID: 25815751 PMCID: PMC4376522 DOI: 10.1371/journal.pone.0120611] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2014] [Accepted: 02/02/2015] [Indexed: 11/18/2022] Open
Abstract
The nucleation and growth of crystalline ice during cooling, and further crystallization processes during re-warming are considered to be key processes determining the success of low temperature storage of biological objects, as used in medical, agricultural and nature conservation applications. To avoid these problems a method, termed vitrification, is being developed to inhibit ice formation by use of high concentration of cryoprotectants and ultra-rapid cooling, but this is only successful across a limited number of biological objects and in small volume applications. This study explores physical processes of ice crystal formation in a model cryoprotective solution used previously in trials on vitrification of complex biological systems, to improve our understanding of the process and identify limiting biophysical factors. Here we present results of neutron scattering experiments which show that even if ice crystal formation has been suppressed during quench cooling, the water molecules, mobilised during warming, can crystallise as detectable ice. The crystallisation happens right after melting of the glass phase formed during quench cooling, whilst the sample is still transiting deep cryogenic temperatures. We also observe strong water isotope effects on ice crystallisation processes in the cryoprotectant mixture. In the neutron scattering experiment with a fully protiated water component, we observe ready crystallisation occurring just after the glass melting transition. On the contrary with a fully deuteriated water component, the process of crystallisation is either completely or substantially supressed. This behaviour might be explained by nuclear quantum effects in water. The strong isotope effect, observed here, may play an important role in development of new cryopreservation strategies.
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Affiliation(s)
- Oleg Kirichek
- ISIS facility, STFC, Rutherford Appleton Laboratory, Harwell Oxford Campus, Didcot, Oxon, United Kingdom
- * E-mail:
| | - Alan Soper
- ISIS facility, STFC, Rutherford Appleton Laboratory, Harwell Oxford Campus, Didcot, Oxon, United Kingdom
| | - Boris Dzyuba
- South Bohemian Research Center of Aquaculture and Hydrocenoses, University of South Bohemia in Ceske Budejovice, Zatisi, Vodnany, Czech Republic
| | - Sam Callear
- ISIS facility, STFC, Rutherford Appleton Laboratory, Harwell Oxford Campus, Didcot, Oxon, United Kingdom
| | - Barry Fuller
- Department of Surgery & Liver Transplant Unit, University College London, UCL Royal Free Campus, London, United Kingdom
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27
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Abstract
We present the discovery of an unusually large isotope effect in the structural relaxation and the glass transition temperature Tg of water. Dielectric relaxation spectroscopy of low-density as well as of vapor-deposited amorphous water reveal Tg differences of 10 ± 2 K between H2O and D2O, sharply contrasting with other hydrogen-bonded liquids for which H/D exchange increases Tg by typically less than 1 K. We show that the large isotope effect and the unusual variation of relaxation times in water at low temperatures can be explained in terms of quantum effects. Thus, our findings shed new light on water's peculiar low-temperature dynamics and the possible role of quantum effects in its structural relaxation, and possibly in dynamics of other low-molecular-weight liquids.
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28
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Geometric isotope effects on small chloride ion water clusters with path integral molecular dynamics simulations. Chem Phys 2013. [DOI: 10.1016/j.chemphys.2013.10.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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29
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Kikuchi T, Nakajima K, Ohira-Kawamura S, Inamura Y, Yamamuro O, Kofu M, Kawakita Y, Suzuya K, Nakamura M, Arai M. Mode-distribution analysis of quasielastic neutron scattering and application to liquid water. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2013; 87:062314. [PMID: 23848682 DOI: 10.1103/physreve.87.062314] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2012] [Revised: 02/25/2013] [Indexed: 06/02/2023]
Abstract
A quasielastic neutron scattering (QENS) experiment is a particular technique that endeavors to define a relationship between time and space for the diffusion dynamics of atoms and molecules. However, in most cases, analyses of QENS data are model dependent, which may distort attempts to elucidate the actual diffusion dynamics. We have developed a method for processing QENS data without a specific model, wherein all modes can be described as combinations of the relaxations based on the exponential law. By this method, we can obtain a distribution function B(Q,Γ), which we call the mode-distribution function (MDF), to represent the number of relaxation modes and distributions of the relaxation times in the modes. The deduction of MDF is based on the maximum entropy method and is very versatile in QENS data analysis. To verify this method, reproducibility was checked against several analytical models, such as that with a mode of distributed relaxation time, that with two modes closely located, and that represented by the Kohlrausch-Williams-Watts function. We report the first application to experimental data of liquid water. In addition to the two known modes, the existence of a relaxation mode of water molecules with an intermediate time scale has been discovered. We propose that the fast mode might be assigned to an intermolecular motion and the intermediate motion might be assigned to a rotational motion of the water molecules instead of to the fast mode.
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Affiliation(s)
- Tatsuya Kikuchi
- Neutron Science Section, J-PARC Center, Tokai, Ibaraki 319-1195, Japan
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30
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Nuzhdin K, Bartels DM. Hyperfine coupling of the hydrogen atom in high temperature water. J Chem Phys 2013; 138:124503. [PMID: 23556732 DOI: 10.1063/1.4795005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The hyperfine coupling constant of the hydrogen atom has been measured in pressurized liquid water up to 300 °C. The reduced constant A(water)∕A(vacuum) is 0.9939 at room temperature, and decreases to a minimum of 0.9918 at 240 °C. The reduced constant then increases at higher temperature. The g-factor is 2.002244(10) at room temperature and decreases to 2.00221(1) at 240 °C. The change in g-factor is proportional to the change in hyperfine coupling. The behavior below 110 °C is in excellent agreement with a previously proposed model in which the H atom is confined to a harmonic solvent cage, and vibrations within the cage mix "p-type" character into the wavefunction, resulting inA(water)∕A(vacuum) < 1. The harmonic model breaks down above 130 °C. We demonstrate that a classical binary collision model using approximate partial molar volume information can recover the observed minima near 240 °C.
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Affiliation(s)
- Kirill Nuzhdin
- Notre Dame Radiation Laboratory & Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, USA
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31
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Skinner LB, Huang C, Schlesinger D, Pettersson LGM, Nilsson A, Benmore CJ. Benchmark oxygen-oxygen pair-distribution function of ambient water from x-ray diffraction measurements with a wide Q-range. J Chem Phys 2013; 138:074506. [DOI: 10.1063/1.4790861] [Citation(s) in RCA: 349] [Impact Index Per Article: 31.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
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32
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Busch S, Pardo LC, O'Dell WB, Bruce CD, Lorenz CD, McLain SE. On the structure of water and chloride ion interactions with a peptide backbone in solution. Phys Chem Chem Phys 2013; 15:21023-33. [DOI: 10.1039/c3cp53831a] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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33
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Salmon PS, Zeidler A. Identifying and characterising the different structural length scales in liquids and glasses: an experimental approach. Phys Chem Chem Phys 2013; 15:15286-308. [DOI: 10.1039/c3cp51741a] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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34
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Fischer HE, Simonson JM, Neuefeind JC, Lemmel H, Rauch H, Zeidler A, Salmon PS. The bound coherent neutron scattering lengths of the oxygen isotopes. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2012; 24:505105. [PMID: 23172673 DOI: 10.1088/0953-8984/24/50/505105] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The technique of neutron interferometry was used to measure the bound coherent neutron scattering length b(coh) of the oxygen isotopes (17)O and (18)O. From the measured difference in optical path between two water samples, either H(2)(17)O or H(2)(18)O versus H(2)(nat)O, where nat denotes the natural isotopic composition, we obtain b(coh,(17)O) = 5.867(4) fm and b(coh,(18)O) = 6.009(5) fm, based on the accurately known value of b(coh,(nat)O) = 5.805(4) fm which is equal to b(coh,(16)O) within the experimental uncertainty. Our results for b(coh,(17)O) and b(coh,(18)O) differ appreciably from the standard tabulated values of 5.6(5) fm and 5.84(7) fm, respectively. In particular, our measured scattering-length contrast of 0.204(3) fm between (18)O and (nat)O is nearly a factor of 6 greater than the tabulated value, which renders feasible neutron diffraction experiments using (18)O isotope substitution and thereby offers new possibilities for measuring the partial structure factors of oxygen-containing compounds, such as water.
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