51
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Farhi E, Ferran G, Haeck W, Pellegrini E, Calzavara Y. Light and heavy water dynamic structure factor for neutron transport codes. J NUCL SCI TECHNOL 2014. [DOI: 10.1080/00223131.2014.984002] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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52
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Milischuk AA, Ladanyi BM. Polarizability anisotropy relaxation in nanoconfinement: Molecular simulation study of water in cylindrical silica pores. J Chem Phys 2014; 141:18C513. [DOI: 10.1063/1.4896218] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Anatoli A. Milischuk
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872, USA
| | - Branka M. Ladanyi
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872, USA
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53
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Leoni F, Franzese G. Structural behavior and dynamics of an anomalous fluid between attractive and repulsive walls: Templating, molding, and superdiffusion. J Chem Phys 2014; 141:174501. [DOI: 10.1063/1.4899256] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Affiliation(s)
- Fabio Leoni
- Departament de Fisica Fonamental, Universitat de Barcelona, Martí i Franquès 1, 08028 Barcelona, Spain
| | - Giancarlo Franzese
- Departament de Fisica Fonamental, Universitat de Barcelona, Martí i Franquès 1, 08028 Barcelona, Spain
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54
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Márquez Damián J, Granada J, Malaspina D. CAB models for water: A new evaluation of the thermal neutron scattering laws for light and heavy water in ENDF-6 format. ANN NUCL ENERGY 2014. [DOI: 10.1016/j.anucene.2013.11.014] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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55
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Anovitz LM, Mamontov E, ben Ishai P, Kolesnikov AI. Anisotropic dynamics of water ultraconfined in macroscopically oriented channels of single-crystal beryl: a multifrequency analysis. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2013; 88:052306. [PMID: 24329263 DOI: 10.1103/physreve.88.052306] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2013] [Revised: 08/09/2013] [Indexed: 06/03/2023]
Abstract
The properties of fluids can be significantly altered by the geometry of their confining environments. While there has been significant work on the properties of such confined fluids, the properties of fluids under ultraconfinement, environments where, at least in one plane, the dimensions of the confining environment are similar to that of the confined molecule, have not been investigated. This paper investigates the dynamic properties of water in beryl (Be(3)Al(2)Si(6)O(18)), the structure of which contains approximately 5-Å-diam channels parallel to the c axis. Three techniques, inelastic neutron scattering, quasielastic neutron scattering, and dielectric spectroscopy, have been used to quantify these properties over a dynamic range covering approximately 16 orders of magnitude. Because beryl can be obtained in large single crystals we were able to quantify directional variations, perpendicular and parallel to the channel directions, in the dynamics of the confined fluid. These are significantly anisotropic and, somewhat counterintuitively, show that vibrations parallel to the c-axis channels are significantly more hindered than those perpendicular to the channels. The effective potential for vibrations in the c direction is harder than the potential in directions perpendicular to it. There is evidence of single-file diffusion of water molecules along the channels at higher temperatures, but below 150 K this diffusion is strongly suppressed. No such suppression, however, has been observed in the channel-perpendicular direction. Inelastic neutron scattering spectra include an intramolecular stretching O-H peak at ~465 meV. As this is nearly coincident with that known for free water molecules and approximately 30 meV higher than that in liquid water or ice, this suggests that there is no hydrogen bonding constraining vibrations between the channel water and the beryl structure. However, dielectric spectroscopic measurements at higher temperatures and lower frequencies yield an activation energy for the dipole reorientation of 16.4 ± 0.14 kJ/mol, close to the energy required to break a hydrogen bond in bulk water. This may suggest the presence of some other form of bonding between the water molecules and the structure, but the resolution of the apparent contradiction between the inelastic neutron and dielectric spectroscopic results remains uncertain.
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Affiliation(s)
- Lawrence M Anovitz
- Chemical Sciences Division, MS 6110, P.O. Box 2008, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6110, USA
| | - Eugene Mamontov
- Chemical and Engineering Materials Division, MS 6473, P.O. Box 2008, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6473, USA
| | - Paul ben Ishai
- Department of Applied Physics, The Hebrew University of Jerusalem, Givat Ram, 91904 Jerusalem, Israel
| | - Alexander I Kolesnikov
- Chemical and Engineering Materials Division, MS 6473, P.O. Box 2008, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6473, USA
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56
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Marquez Damian JI, Malaspina DC, Granada JR. Vibrational spectra of light and heavy water with application to neutron cross section calculations. J Chem Phys 2013; 139:024504. [PMID: 23862950 DOI: 10.1063/1.4812828] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- J I Marquez Damian
- Neutron Physics Department and Instituto Balseiro, Centro Atómico Bariloche, CNEA, Argentina.
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57
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Bertrand CE, Liu KH, Mamontov E, Chen SH. Hydration-dependent dynamics of deeply cooled water under strong confinement. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2013; 87:042312. [PMID: 23679419 DOI: 10.1103/physreve.87.042312] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2013] [Revised: 03/20/2013] [Indexed: 06/02/2023]
Abstract
We have measured the hydration-level dependence of the single-particle dynamics of water confined in the ordered mesoporous silica MCM-41. The dynamic crossover observed at full hydration is absent at monolayer hydration. The monolayer dynamics are significantly slower than those of water in a fully hydrated pore at ambient temperatures. At low temperatures, the opposite is found to be true. These results underscore the importance of water's tetrahedral hydrogen-bond network in accounting for its low temperature dynamic properties.
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Affiliation(s)
- C E Bertrand
- Department of Nuclear Science & Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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58
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Guchhait B, Biswas R, Ghorai PK. Solute and Solvent Dynamics in Confined Equal-Sized Aqueous Environments of Charged and Neutral Reverse Micelles: A Combined Dynamic Fluorescence and All-Atom Molecular Dynamics Simulation Study. J Phys Chem B 2013; 117:3345-61. [DOI: 10.1021/jp310285k] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Biswajit Guchhait
- Department
of Chemical, Biological and
Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt
Lake, Kolkata 700098, India
| | - Ranjit Biswas
- Department
of Chemical, Biological and
Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt
Lake, Kolkata 700098, India
| | - Pradip K. Ghorai
- Indian Institute of Science Education and Research, Kolkata, Mohanpur Campus, Nadia 741252,
India
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59
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Paciaroni A, Orecchini A, Goracci G, Cornicchi E, Petrillo C, Sacchetti F. Glassy Character of DNA Hydration Water. J Phys Chem B 2013; 117:2026-31. [DOI: 10.1021/jp3105437] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Alessandro Paciaroni
- Dipartimento di Fisica, Università degli Studi di Perugia, Via Pascoli
I-06123 Perugia, Italy
- Istituto Officina dei Materiali,
Unità di Perugia, c/o Dipartimento di Fisica, Università di Perugia, I-06123 Perugia, Italy
| | - Andrea Orecchini
- Dipartimento di Fisica, Università degli Studi di Perugia, Via Pascoli
I-06123 Perugia, Italy
- Istituto Officina dei Materiali,
Unità di Perugia, c/o Dipartimento di Fisica, Università di Perugia, I-06123 Perugia, Italy
- Institut Laue Langevin, 6 rue J. Horowitz F-38042 Grenoble, France
| | - Guido Goracci
- Dipartimento di Fisica, Università degli Studi di Perugia, Via Pascoli
I-06123 Perugia, Italy
| | - Elena Cornicchi
- Dipartimento di Fisica, Università degli Studi di Perugia, Via Pascoli
I-06123 Perugia, Italy
| | - Caterina Petrillo
- Dipartimento di Fisica, Università degli Studi di Perugia, Via Pascoli
I-06123 Perugia, Italy
- Istituto Officina dei Materiali,
Unità di Perugia, c/o Dipartimento di Fisica, Università di Perugia, I-06123 Perugia, Italy
| | - Francesco Sacchetti
- Dipartimento di Fisica, Università degli Studi di Perugia, Via Pascoli
I-06123 Perugia, Italy
- Istituto Officina dei Materiali,
Unità di Perugia, c/o Dipartimento di Fisica, Università di Perugia, I-06123 Perugia, Italy
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60
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Fujiwara S, Plazanet M, Oda T. Coupling of the hydration water dynamics and the internal dynamics of actin detected by quasielastic neutron scattering. Biochem Biophys Res Commun 2013; 431:542-6. [PMID: 23321308 DOI: 10.1016/j.bbrc.2013.01.021] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2012] [Accepted: 01/07/2013] [Indexed: 11/17/2022]
Abstract
In order to characterize dynamics of water molecules around F-actin and G-actin, quasielastic neutron scattering experiments were performed on powder samples of F-actin and G-actin, hydrated either with D(2)O or H(2)O, at hydration ratios of 0.4 and 1.0. By combined analysis of the quasielastic neutron scattering spectra, the parameter values characterizing the dynamics of the water molecules in the first hydration layer and those of the water molecules outside of the first layer were obtained. The translational diffusion coefficients (D(T)) of the hydration water in the first layer were found to be 1.2×10(-5) cm(2)/s and 1.7×10(-5) cm(2)/s for F-actin and G-actin, respectively, while that for bulk water was 2.8×10(-5) cm(2)/s. The residence times were 6.6 ps and 5.0 ps for F-actin and G-actin, respectively, while that for bulk water was 0.62 ps. These differences between F-actin and G-actin, indicating that the hydration water around G-actin is more mobile than that around F-actin, are in concert with the results of the internal dynamics of F-actin and G-actin, showing that G-actin fluctuates more rapidly than F-actin. This implies that the dynamics of the hydration water is coupled to the internal dynamics of the actin molecules. The D(T) values of the water molecules outside of the first hydration layer were found to be similar to that of bulk water though the residence times are strongly affected by the first hydration layer. This supports the recent observation on intracellular water that shows bulk-like behavior.
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Affiliation(s)
- Satoru Fujiwara
- Quantum Beam Science Directorate, Japan Atomic Energy Agency, Tokai-mura, Naka-gun, Ibaraki 319-1195, Japan.
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61
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ITO K, YOSHIDA K, UJIMOTO K, YAMAGUCHI T. Thermal Behavior and Structure of Low-temperature Water Confined in Sephadex G15 Gel by Differential Scanning Calorimetry and X-ray Diffraction Method. ANAL SCI 2013; 29:353-9. [DOI: 10.2116/analsci.29.353] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Kanae ITO
- Department of Chemistry, Faculty of Science, Fukuoka University
| | - Koji YOSHIDA
- Department of Chemistry, Faculty of Science, Fukuoka University
| | | | - Toshio YAMAGUCHI
- Department of Chemistry, Faculty of Science, Fukuoka University
- Advanced Materials Institute, Fukuoka University
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62
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Lerbret A, Hédoux A, Annighöfer B, Bellissent-Funel MC. Influence of pressure on the low-frequency vibrational modes of lysozyme and water: A complementary inelastic neutron scattering and molecular dynamics simulation study. Proteins 2012; 81:326-40. [DOI: 10.1002/prot.24189] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2012] [Revised: 07/27/2012] [Accepted: 09/19/2012] [Indexed: 11/06/2022]
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63
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Milischuk AA, Krewald V, Ladanyi BM. Water dynamics in silica nanopores: The self-intermediate scattering functions. J Chem Phys 2012; 136:224704. [DOI: 10.1063/1.4724101] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
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64
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Chathoth SM, Anjos DM, Mamontov E, Brown GM, Overbury SH. Dynamics of Phenanthrenequinone on Carbon Nano-Onion Surfaces Probed by Quasielastic Neutron Scattering. J Phys Chem B 2012; 116:7291-5. [DOI: 10.1021/jp302155a] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Suresh M. Chathoth
- Chemical and Engineering Materials
Division, Neutron Scattering Directorate, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Daniela M. Anjos
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee
37831, United States
| | - Eugene Mamontov
- Chemical and Engineering Materials
Division, Neutron Scattering Directorate, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Gilbert M. Brown
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee
37831, United States
| | - Steven H. Overbury
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee
37831, United States
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65
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Jiménez-Ruiz M, Ferrage E, Delville A, Michot LJ. Anisotropy on the collective dynamics of water confined in swelling clay minerals. J Phys Chem A 2012; 116:2379-87. [PMID: 22324768 DOI: 10.1021/jp201543t] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Collective excitations of water confined in the interlayer space of swelling clay minerals were studied by means of inelastic neutron scattering. The effect of bidimensional confinement on the dynamics of the interlayer water was investigated by using a synthetic Na-saponite sample with a general formula of Si(7.3)Al(0.7)Mg(6)O(20)(OH)(4)Na(0.7) in a bilayer hydration state. Experimental results reveal two inelastic signals, different from those described for bulk water with a clear anisotropy on the low-energy excitation of the collective dynamics of interlayer water, this difference being stronger in the perpendicular direction. Results obtained for the parallel direction follow the same trend as bulk water, and the effect of the confinement is mainly manifested from the fact that clay interlayer water is more structured than bulk water. Data obtained in the perpendicular direction display a nondispersive behavior below a cutoff wavenumber value, Q(c), indicating a nonpropagative excitation below that value. Molecular dynamics simulations results agree qualitatively with the experimental results.
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Affiliation(s)
- M Jiménez-Ruiz
- Institut Laue Langevin, 6 Rue Jules Horowitz, BP. 156, F-38042 Grenoble Cedex 9, France.
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66
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Strekalova EG, Mazza MG, Stanley HE, Franzese G. Hydrophobic nanoconfinement suppresses fluctuations in supercooled water. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2012; 24:064111. [PMID: 22277682 DOI: 10.1088/0953-8984/24/6/064111] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We perform very efficient Monte Carlo simulations to study the phase diagram of a water monolayer confined in a fixed disordered matrix of hydrophobic nanoparticles between two hydrophobic plates. We consider different hydrophobic nanoparticle concentrations c. We adopt a coarse-grained model of water that, for c = 0, displays a first-order liquid-liquid phase transition (LLPT) line with negative slope in the pressure-temperature (P-T) plane, ending in a liquid-liquid critical point at about 174 K and 0.13 GPa. We show that upon increase of c the liquid-gas spinodal and the temperature of the maximum density line are shifted with respect to the c = 0 case. We also find dramatic changes in the region around the LLPT. In particular, we observe a substantial (more than 90%) decrease of isothermal compressibility, thermal expansion coefficient and constant-pressure specific heat upon increasing c, consistent with recent experiments. Moreover, we find that a hydrophobic nanoparticle concentration as small as c = 2.4% is enough to destroy the LLPT for P ≥ 0.16 GPa. The fluctuations of volume apparently diverge at P ≈ 0.16 GPa, suggesting that the LLPT line ends in an LL critical point at 0.16 GPa. Therefore, nanoconfinement reduces the range of P-T where the LLPT is observable. By increasing the hydrophobic nanoparticle concentration c, the LLPT becomes weaker and its P-T range smaller. The model allows us to explain these phenomena in terms of a proliferation of interfaces among domains with different local order, promoted by the hydrophobic effect of the water-hydrophobic-nanoparticle interfaces.
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Affiliation(s)
- E G Strekalova
- Center for Polymer Studies and Department of Physics, Boston University, Boston, MA 02215, USA.
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67
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Strekalova EG, Corradini D, Mazza MG, Buldyrev SV, Gallo P, Franzese G, Stanley HE. Effect of hydrophobic environments on the hypothesized liquid-liquid critical point of water. J Biol Phys 2011; 38:97-111. [PMID: 23277673 DOI: 10.1007/s10867-011-9241-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2011] [Accepted: 09/27/2011] [Indexed: 11/26/2022] Open
Abstract
The complex behavior of liquid water, along with its anomalies and their crucial role in the existence of life, continue to attract the attention of researchers. The anomalous behavior of water is more pronounced at subfreezing temperatures and numerous theoretical and experimental studies are directed towards developing a coherent thermodynamic and dynamic framework for understanding supercooled water. The existence of a liquid-liquid critical point in the deep supercooled region has been related to the anomalous behavior of water. However, the experimental study of supercooled water at very low temperatures is hampered by the homogeneous nucleation of the crystal. Recently, water confined in nanoscopic structures or in solutions has attracted interest because nucleation can be delayed. These systems have a tremendous relevance also for current biological advances; e.g., supercooled water is often confined in cell membranes and acts as a solvent for biological molecules. In particular, considerable attention has been recently devoted to understanding hydrophobic interactions or the behavior of water in the presence of apolar interfaces due to their fundamental role in self-assembly of micelles, membrane formation and protein folding. This article reviews and compares two very recent computational works aimed at elucidating the changes in the thermodynamic behavior in the supercooled region and the liquid-liquid critical point phenomenon for water in contact with hydrophobic environments. The results are also compared to previous reports for water in hydrophobic environments.
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Affiliation(s)
- Elena G Strekalova
- Center for Polymer Studies and Department of Physics, Boston University, Boston, MA 02215 USA
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68
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Sharma VK, Mitra S, Kumar A, Yusuf SM, Juranyi F, Mukhopadhyay R. Diffusion of water in molecular magnet Cu(0.75)Mn(0.75)[Fe(CN)6]·7H2O. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2011; 23:446002. [PMID: 22005137 DOI: 10.1088/0953-8984/23/44/446002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Here we report the dynamical behaviour of water in Prussian blue analogue (PBA) Cu(0.75)Mn(0.75)[Fe(CN)(6)]·7H(2)O molecular magnet in the temperature range 260-360 K as studied using the quasielastic neutron scattering technique. While significant quasielastic broadening is observed in the hydrated sample, no broadening was observed in the dehydrated one. Data analysis showed that the observed quasielastic broadening in Cu(0.75)Mn(0.75)[Fe(CN)(6)]·7H(2)O corresponds to the dynamics of the non-coordinated water molecules at the 32f site and the coordinated water molecules at the 24e site, existing in the cavities created by the absence of Fe(CN)(6) units. The non-coordinated water molecules at 8c interstitial sites do not contribute to the broadening, suggesting that they are immobile at least within the time window of the spectrometer used. Behaviour of the elastic incoherent structure factor is consistent with the model where the water molecules undergo translational diffusion localized within the cavity of 5.1 Å. While all the non-coordinated water molecules at the 32f site are dynamic over the entire range of temperatures, the coordinated ones at the 24e site become progressively dynamic with temperature. The water molecules were found to undergo hindered (~1.16 × 10(-5) cm(2) s(-1) at 300 K) diffusion compared to bulk water and the diffusivity followed Arrhenius behaviour within the measured temperature range with an activation energy of 1.26 kcal mol(-1).
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Affiliation(s)
- V K Sharma
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
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69
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Milischuk AA, Ladanyi BM. Structure and dynamics of water confined in silica nanopores. J Chem Phys 2011; 135:174709. [DOI: 10.1063/1.3657408] [Citation(s) in RCA: 148] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
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70
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Cornicchi E, Sebastiani F, De Francesco A, Orecchini A, Paciaroni A, Petrillo C, Sacchetti F. Collective density fluctuations of DNA hydration water in the time-window below 1 ps. J Chem Phys 2011; 135:025101. [PMID: 21766968 DOI: 10.1063/1.3609101] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The coherent density fluctuations propagating through DNA hydration water were studied by neutron scattering spectroscopy. Two collective modes were found to be sustained by the aqueous solvent: a propagating excitation, characterised by a speed of about 3500 m/s, and another one placed at about 6 meV. These results globally agree with those previously found for the coherent excitations in bulk water, although in DNA hydration water the speed of propagating modes is definitely higher than that of the pure solvent. The short-wavelength collective excitations of DNA hydration water are reminiscent of those observed in protein hydration water and in the amorphous forms of ice.
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Affiliation(s)
- Elena Cornicchi
- Dipartimento di Fisica, Università degli Studi di Perugia, Via Pascoli, I-06123 Perugia, Italy.
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71
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de los Santos F, Franzese G. Understanding diffusion and density anomaly in a coarse-grained model for water confined between hydrophobic walls. J Phys Chem B 2011; 115:14311-20. [PMID: 22129131 DOI: 10.1021/jp206197t] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
We study, by Monte Carlo simulations, a coarse-grained model of a water monolayer between hydrophobic walls at partial hydration, with a wall-to-wall distance of about 0.5 nm. We analyze how the diffusion constant parallel to the walls, D(∥), changes and correlates to the phase diagram of the system. We find a locus of D(∥) maxima and a locus of D(∥) minima along isotherms, with lines of constant D(∥) resembling the melting line of bulk water. The two loci of D(∥) extrema envelope the line of temperatures of density maxima at constant P. We show how these loci are related to the anomalous volume behavior due to the hydrogen bonds. At much lower T, confined water becomes subdiffusive, and we discuss how this behavior is a consequence of the increased correlations among water molecules when the hydrogen bond network develops. Within the subdiffusive region, although translations are largely hampered, we observe that the hydrogen bond network can equilibrate, and its rearrangement is responsible for the appearance of density minima along isobars. We clarify that the minima are not necessarily related to the saturation of the hydrogen bond network.
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Affiliation(s)
- Francisco de los Santos
- Departamento de Electromagnetismo y Física de la Materia, Universidad de Granada, Fuentenueva s/n, 18071 Granada, Spain
| | - Giancarlo Franzese
- Departamento de Física Fundamental, Universitat de Barcelona, Diagonal 645, 08028 Barcelona, Spain
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72
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Viñales A, Dawidowski J, Márquez Damián J. Neutron total cross-section model for liquids and its application to light water. ANN NUCL ENERGY 2011. [DOI: 10.1016/j.anucene.2011.04.015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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73
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Strekalova EG, Mazza MG, Stanley HE, Franzese G. Large decrease of fluctuations for supercooled water in hydrophobic nanoconfinement. PHYSICAL REVIEW LETTERS 2011; 106:145701. [PMID: 21561203 DOI: 10.1103/physrevlett.106.145701] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2010] [Revised: 01/31/2011] [Indexed: 05/30/2023]
Abstract
Using Monte Carlo simulations, we study a coarse-grained model of a water layer confined in a fixed disordered matrix of hydrophobic nanoparticles at different particle concentrations c. For c=0, we find a first-order liquid-liquid phase transition (LLPT) ending in one critical point at low pressure P. For c>0, our simulations are consistent with a LLPT line ending in two critical points at low and high P. For c=25%, at high P and low temperature, we find a dramatic decrease of compressibility, thermal expansion coefficient, and specific heat. Surprisingly, the effect is present also for c as low as 2.4%. We conclude that even a small presence of hydrophobic nanoparticles can drastically suppress thermodynamic fluctuations, making the detection of the LLPT more difficult.
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Affiliation(s)
- Elena G Strekalova
- Center for Polymer Studies and Department of Physics, Boston University, Boston, Massachusetts 02215, USA
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74
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Mamontov E, Baker GA, Luo H, Dai S. Microscopic Diffusion Dynamics of Silver Complex-Based Room-Temperature Ionic Liquids Probed by Quasielastic Neutron Scattering. Chemphyschem 2011; 12:944-50. [DOI: 10.1002/cphc.201001017] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2010] [Indexed: 11/09/2022]
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75
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76
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Recent advances in SALDI-MS techniques and their chemical and bioanalytical applications. Anal Bioanal Chem 2010; 399:2597-622. [DOI: 10.1007/s00216-010-4063-3] [Citation(s) in RCA: 151] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2010] [Revised: 07/18/2010] [Accepted: 07/23/2010] [Indexed: 10/19/2022]
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77
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78
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Russo D, Copley JR, Ollivier J, Teixeira J. On the behaviour of water hydrogen bonds at biomolecular sites: Dependences on temperature and on network dimensionality. J Mol Struct 2010. [DOI: 10.1016/j.molstruc.2009.12.020] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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79
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Glass DC, Krishnan M, Nutt DR, Smith JC. Temperature Dependence of Protein Dynamics Simulated with Three Different Water Models. J Chem Theory Comput 2010. [DOI: 10.1021/ct9006508] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Dennis C. Glass
- University of Tennessee/ORNL Center for Molecular Biophysics, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, Tennessee 37831, and Department of Chemistry, University of Reading, Whiteknights, Reading RG6 6AD, United Kingdom
| | - Marimuthu Krishnan
- University of Tennessee/ORNL Center for Molecular Biophysics, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, Tennessee 37831, and Department of Chemistry, University of Reading, Whiteknights, Reading RG6 6AD, United Kingdom
| | - David R. Nutt
- University of Tennessee/ORNL Center for Molecular Biophysics, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, Tennessee 37831, and Department of Chemistry, University of Reading, Whiteknights, Reading RG6 6AD, United Kingdom
| | - Jeremy C. Smith
- University of Tennessee/ORNL Center for Molecular Biophysics, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, Tennessee 37831, and Department of Chemistry, University of Reading, Whiteknights, Reading RG6 6AD, United Kingdom
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80
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Ortore MG, Spinozzi F, Mariani P, Paciaroni A, Barbosa LRS, Amenitsch H, Steinhart M, Ollivier J, Russo D. Combining structure and dynamics: non-denaturing high-pressure effect on lysozyme in solution. J R Soc Interface 2009; 6 Suppl 5:S619-34. [PMID: 19570795 PMCID: PMC2843975 DOI: 10.1098/rsif.2009.0163.focus] [Citation(s) in RCA: 78] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2009] [Accepted: 06/03/2009] [Indexed: 11/12/2022] Open
Abstract
Small-angle X-ray scattering (SAXS) and elastic and quasi-elastic neutron scattering techniques were used to investigate the high-pressure-induced changes on interactions, the low-resolution structure and the dynamics of lysozyme in solution. SAXS data, analysed using a global-fit procedure based on a new approach for hydrated protein form factor description, indicate that lysozyme completely maintains its globular structure up to 1500 bar, but significant modifications in the protein-protein interaction potential occur at approximately 600-1000 bar. Moreover, the mass density of the protein hydration water shows a clear discontinuity within this pressure range. Neutron scattering experiments indicate that the global and the local lysozyme dynamics change at a similar threshold pressure. A clear evolution of the internal protein dynamics from diffusing to more localized motions has also been probed. Protein structure and dynamics results have then been discussed in the context of protein-water interface and hydration water dynamics. According to SAXS results, the new configuration of water in the first hydration layer induced by pressure is suggested to be at the origin of the observed local mobility changes.
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Affiliation(s)
- Maria Grazia Ortore
- Dipartimento SAIFET, Sezione Scienze Fisiche, Università Politecnica delle Marche and CNISM, Ancona, Italy
| | - Francesco Spinozzi
- Dipartimento SAIFET, Sezione Scienze Fisiche, Università Politecnica delle Marche and CNISM, Ancona, Italy
| | - Paolo Mariani
- Dipartimento SAIFET, Sezione Scienze Fisiche, Università Politecnica delle Marche and CNISM, Ancona, Italy
| | - Alessandro Paciaroni
- Dipartimento di Fisica, Università degli Studi di Perugia and CNISM, Perugia, Italy
| | | | - Heinz Amenitsch
- Institute of Biophysics and Nanosystems Research, Austrian Academy of Sciences, Graz, Austria
| | - Milos Steinhart
- Institute of Macromolecular Chemistry, Prague, Czech Republic
| | | | - Daniela Russo
- CNR-INFM and CRS-SOFT, c/o Institut Laue-Langevin, Grenoble, France
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81
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Russo D, Teixeira J, Ollivier J. The impact of hydration water on the dynamics of side chains of hydrophobic peptides: from dry powder to highly concentrated solutions. J Chem Phys 2009; 130:235101. [PMID: 19548762 DOI: 10.1063/1.3154383] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Elastic and quasielastic neutron scattering experiments are used to investigate the dynamics of side chains in proteins, using hydrophobic peptides, from dry and hydrated powders up to solutions, as models. The changes of the internal dynamics of a prototypical hydrophobic amino acid, N-acetyl-leucine-methylamide, and alanine amino acids are investigated as a function of water/peptide molecular ratio. While previous results have shown that, in concentrated solution, when the hydrophobic side chains are hydrated by a single hydration water layer, the only allowed motions are confined and can be attributed to librational/rotational movements associated with the methyl groups. In the present work we observe a dynamical evolution from dry to highly hydrated powder. We also observe rotational and diffusive motions and a dynamical transition at approximately 250 K for long side chain peptides while for peptides with short side chains, there is no dynamical transition but only rotational motions. With a local measurement of the influence of hydration water dynamics on the amino acid side chains dynamics, we provide unique experimental evidence that the structural and dynamical properties of interfacial water strongly influence the side chain dynamics and the activation of diffusive motions. We also emphasize that the side chain length has a role on the onset of dynamical transition.
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Affiliation(s)
- Daniela Russo
- Institut Laue Langevin, CNR-INFM and CRS/Soft, 6 rue J. Horowitz BP156, F-38042 Grenoble, France.
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82
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Swenson J, Bergman R, Bowron DT, Longeville S. Water structure and dynamics in a fully hydrated sodium vermiculite clay. ACTA ACUST UNITED AC 2009. [DOI: 10.1080/13642810208223138] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- J. Swenson
- a Department of Applied Physics , Chalmers University of Technology , SE-412 96 , Göteborg, Sweden
| | - R. Bergman
- b Department of Experimental Physics , Chalmers University of Technology , SE-412 96 , Göteborg, Sweden
| | - D. T. Bowron
- c Rutherford Appleton Laboratory, Chilton, Didcot , Oxfordshire , OX11 0QX , UK
| | - S. Longeville
- d Technische Universität München, Physik department, James Franck Strasse 1, D-85748 Garching, Germany, and Laboratoire Léon Brillouin, Commissariat à l'Énergie Atomique Saclay , F-911 91, Gif sur Yvette , Cedex , France
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83
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Jasnin M. Atomic-scale dynamics inside living cells explored by neutron scattering. J R Soc Interface 2009; 6 Suppl 5:S611-7. [PMID: 19586955 DOI: 10.1098/rsif.2009.0144.focus] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Single-particle neutron spectroscopy has contributed important experimental data on molecular dynamics in biological systems. The technique provides information on atomic and molecular motions in macromolecules on the picosecond to the nanosecond time scale, which are essential to biological function. Here, we report on recent neutron measurements performed directly in living cells by using isotope labelling to explore the dynamics of specific cellular components. The paper proposes an integrated view of results on atomic-scale cell water dynamics, internal and global macromolecular motions and solvent isotope effect on macromolecular dynamics. The work established the specific usefulness of the neutron scattering technique to get insight into biologically relevant dynamical features, in particular through comparative measurements. The method developed can now be applied to look for dynamical signatures related to cell characteristics in many different cell types and organelles.
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Affiliation(s)
- Marion Jasnin
- Institut Laue-Langevin, 6 rue Jules Horowitz, BP 156, 38042 Grenoble Cedex 9, France.
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84
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Faraone A, Liu KH, Mou CY, Zhang Y, Chen SH. Single particle dynamics of water confined in a hydrophobically modified MCM-41-S nanoporous matrix. J Chem Phys 2009; 130:134512. [DOI: 10.1063/1.3097800] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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85
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Page KA, Park JK, Moore RB, Garcia Sakai V. Direct Analysis of the Ion-Hopping Process Associated with the α-Relaxation in Perfluorosulfonate Ionomers Using Quasielastic Neutron Scattering. Macromolecules 2009. [DOI: 10.1021/ma801533h] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Kirt A. Page
- Polymers Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, Department of Chemistry, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, and Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742
| | - Jong Keun Park
- Polymers Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, Department of Chemistry, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, and Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742
| | - Robert B. Moore
- Polymers Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, Department of Chemistry, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, and Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742
| | - Victoria Garcia Sakai
- Polymers Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, Department of Chemistry, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, and Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742
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86
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Laage D. Reinterpretation of the Liquid Water Quasi-Elastic Neutron Scattering Spectra Based on a Nondiffusive Jump Reorientation Mechanism. J Phys Chem B 2009; 113:2684-7. [DOI: 10.1021/jp900307n] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Damien Laage
- Ecole Normale Supérieure, Département de Chimie, 24 rue Lhomond, F-75005 Paris, France, CNRS, UMR 8640 PASTEUR, 24 rue Lhomond, F-75005 Paris, France
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87
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Structure and Dynamics of Fluids in Microporous and Mesoporous Earth and Engineered Materials. NEUTRON APPLICATIONS IN EARTH, ENERGY AND ENVIRONMENTAL SCIENCES 2009. [DOI: 10.1007/978-0-387-09416-8_19] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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88
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89
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Mamontov E, Luo H, Dai S. Proton Dynamics in N,N,N′,N′-Tetramethylguanidinium Bis(perfluoroethylsulfonyl)imide Protic Ionic Liquid Probed by Quasielastic Neutron Scattering. J Phys Chem B 2008; 113:159-69. [DOI: 10.1021/jp808102k] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Eugene Mamontov
- Neutron Scattering Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6473; Nuclear Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6181; and Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6201
| | - Huimin Luo
- Neutron Scattering Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6473; Nuclear Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6181; and Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6201
| | - Sheng Dai
- Neutron Scattering Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6473; Nuclear Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6181; and Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6201
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90
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Jasnin M, Moulin M, Moulin M, Haertlein M, Zaccai G, Tehei M. Down to atomic-scale intracellular water dynamics. EMBO Rep 2008; 9:543-7. [PMID: 18451876 DOI: 10.1038/embor.2008.50] [Citation(s) in RCA: 78] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2007] [Revised: 02/18/2008] [Accepted: 03/05/2008] [Indexed: 11/09/2022] Open
Abstract
Water constitutes the intracellular matrix in which biological molecules interact. Understanding its dynamic state is a main scientific challenge, which continues to provoke controversy after more than 50 years of study. We measured water dynamics in vivo in the cytoplasm of Escherichia coli by using neutron scattering and isotope labelling. Experimental timescales covered motions from pure water to interfacial water, on an atomic length scale. In contrast to the widespread opinion that water is 'tamed' by macromolecular confinement, the measurements established that water diffusion within the bacteria is similar to that of pure water at physiological temperature.
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Affiliation(s)
- Marion Jasnin
- Institut de Biologie Structurale, UMR 5075, CEA-CNRS-UJF, 41 rue Jules Horowitz, 38027 Grenoble, France
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91
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Kamitakahara WA, Wada N. Neutron spectroscopy of water dynamics in NaX and NaA zeolites. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2008; 77:041503. [PMID: 18517624 DOI: 10.1103/physreve.77.041503] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2007] [Indexed: 05/24/2023]
Abstract
We have investigated the dynamics of water molecules in zeolites NaA and NaX by high-resolution quasielastic neutron scattering methods. Between 260 and 310 K, the local translational diffusive motion of water in the zeolites is one to two orders of magnitude slower than in bulk water. The Q dependence of the scattering shows effects of confinement and the presence of both relatively mobile and immobile molecules. The speed of the diffusive motion depends strongly on hydration level. Comparison with other hydrated siliceous materials indicates that the host charge per water molecule is a major factor in determining the time scale of diffusion.
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Affiliation(s)
- William A Kamitakahara
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, USA
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92
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Park S, Moilanen DE, Fayer MD. Water DynamicsThe Effects of Ions and Nanoconfinement. J Phys Chem B 2008; 112:5279-90. [DOI: 10.1021/jp7121856] [Citation(s) in RCA: 161] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sungnam Park
- Department of Chemistry Stanford University, Stanford, California 94305
| | - David E. Moilanen
- Department of Chemistry Stanford University, Stanford, California 94305
| | - M. D. Fayer
- Department of Chemistry Stanford University, Stanford, California 94305
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93
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Dokter AM, Petersen C, Woutersen S, Bakker HJ. Vibrational dynamics of ice in reverse micelles. J Chem Phys 2008; 128:044509. [DOI: 10.1063/1.2826376] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
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94
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Jalarvo N, Bordallo HN, Aliouane N, Adams MA, Pieper J, Argyriou DN. Dynamics of Water in NaxCoO2·yH2O. J Phys Chem B 2007; 112:703-9. [DOI: 10.1021/jp074398y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Niina Jalarvo
- Hahn-Meitner Institut, Glienicker Strasse 100, 14109 Berlin, Germany, Institut Laue Langevin, B.P. 156, 38042 Grenoble, Cedex 9, France, ISIS Pulsed Neutron Scattering Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, U.K., and Technische Universität Berlin, Institut für Chemie, Max-Volmer-Laboratorium für Biophysikalische Chemie, Strasse des 17. Juni 135 10623 Berlin, Germany
| | - Heloisa N. Bordallo
- Hahn-Meitner Institut, Glienicker Strasse 100, 14109 Berlin, Germany, Institut Laue Langevin, B.P. 156, 38042 Grenoble, Cedex 9, France, ISIS Pulsed Neutron Scattering Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, U.K., and Technische Universität Berlin, Institut für Chemie, Max-Volmer-Laboratorium für Biophysikalische Chemie, Strasse des 17. Juni 135 10623 Berlin, Germany
| | - Nadir Aliouane
- Hahn-Meitner Institut, Glienicker Strasse 100, 14109 Berlin, Germany, Institut Laue Langevin, B.P. 156, 38042 Grenoble, Cedex 9, France, ISIS Pulsed Neutron Scattering Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, U.K., and Technische Universität Berlin, Institut für Chemie, Max-Volmer-Laboratorium für Biophysikalische Chemie, Strasse des 17. Juni 135 10623 Berlin, Germany
| | - Mark A. Adams
- Hahn-Meitner Institut, Glienicker Strasse 100, 14109 Berlin, Germany, Institut Laue Langevin, B.P. 156, 38042 Grenoble, Cedex 9, France, ISIS Pulsed Neutron Scattering Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, U.K., and Technische Universität Berlin, Institut für Chemie, Max-Volmer-Laboratorium für Biophysikalische Chemie, Strasse des 17. Juni 135 10623 Berlin, Germany
| | - Jörg Pieper
- Hahn-Meitner Institut, Glienicker Strasse 100, 14109 Berlin, Germany, Institut Laue Langevin, B.P. 156, 38042 Grenoble, Cedex 9, France, ISIS Pulsed Neutron Scattering Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, U.K., and Technische Universität Berlin, Institut für Chemie, Max-Volmer-Laboratorium für Biophysikalische Chemie, Strasse des 17. Juni 135 10623 Berlin, Germany
| | - Dimitri N. Argyriou
- Hahn-Meitner Institut, Glienicker Strasse 100, 14109 Berlin, Germany, Institut Laue Langevin, B.P. 156, 38042 Grenoble, Cedex 9, France, ISIS Pulsed Neutron Scattering Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, U.K., and Technische Universität Berlin, Institut für Chemie, Max-Volmer-Laboratorium für Biophysikalische Chemie, Strasse des 17. Juni 135 10623 Berlin, Germany
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95
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Moilanen DE, Levinger NE, Spry DB, Fayer MD. Confinement or the nature of the interface? Dynamics of nanoscopic water. J Am Chem Soc 2007; 129:14311-8. [PMID: 17958424 PMCID: PMC2532509 DOI: 10.1021/ja073977d] [Citation(s) in RCA: 194] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The dynamics of water confined in two different types of reverse micelles are studied using ultrafast infrared pump-probe spectroscopy of the hydroxyl OD stretch of HOD in H2O. Reverse micelles of the surfactant Aerosol-OT (ionic head group) in isooctane and the surfactant Igepal CO 520 (nonionic head group) in 50/50 wt % cyclohexane/hexane are prepared to have the same diameter water nanopools. Measurements of the IR spectra and vibrational lifetimes show that the identity of the surfactant head groups affects the local environment experienced by the water molecules inside the reverse micelles. The orientational dynamics (time-dependent anisotropy), which is a measure of the hydrogen bond network rearrangement, are very similar for the confined water in the two types of reverse micelles. The results demonstrate that confinement by an interface to form a nanoscopic water pool is a primary factor governing the dynamics of nanoscopic water rather than the presence of charged groups at the interface.
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Affiliation(s)
| | | | - D. B. Spry
- Department of Chemistry, Stanford University 94305
| | - M. D. Fayer
- Department of Chemistry, Stanford University 94305
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96
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Kittaka S, Yamaguchi T, Bellissent-Funel MC. Interlayer water molecules in vanadium pentoxide hydrate. IX. Anisotropic translational diffusion leading to anisotropic ac conductivity. J Chem Phys 2007; 127:064705. [PMID: 17705619 DOI: 10.1063/1.2756041] [Citation(s) in RCA: 2] [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 anisotropy of the dynamic properties of interlayer water molecules along the a and b axes of vanadium pentoxide hydrate, orthorhombic V2O5.nH2O, was studied using quasielastic neutron scattering (QENS) in relation to the anisotropy of the ac conductivity. The QENS spectra were analyzed using a stretched exponential function and a Lorentzian function. Both methods showed that the double-layer water molecules along the b axis are more mobile than those along the a axis. The difference in mobility between the two axes is more pronounced using a Lorentzian function analysis. These facts suggest that the diffusion coefficient of water molecules along the b axis is larger than that along the a axis, which is closely related to the ac conductivity originating from proton hopping. The anisotropy of the dynamic motion of water molecules can be attributed to the shorter b-axis length (b=3.60 A), with respect to the longer and less regular repetition of the atomic arrangements along the a axis (42.34 A).
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Affiliation(s)
- Shigeharu Kittaka
- Department of Chemistry, Faculty of Science, Okayama University of Science, 1-1 Ridaicho, Okayama 700-0005, Japan.
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97
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Lopes PEM, Murashov V, Tazi M, Demchuk E, Mackerell AD. Development of an empirical force field for silica. Application to the quartz-water interface. J Phys Chem B 2007; 110:2782-92. [PMID: 16471886 PMCID: PMC2531191 DOI: 10.1021/jp055341j] [Citation(s) in RCA: 128] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Interactions of pulverized crystalline silica with biological systems, including the lungs, cause cell damage, inflammation, and apoptosis. To allow computational atomistic modeling of these pathogenic processes, including interactions between silica surfaces and biological molecules, new parameters for quartz, compatible with the CHARMM empirical force field were developed. Parameters were optimized to reproduce the experimental geometry of alpha-quartz, ab initio vibrational spectra, and interactions between model compounds and water. The newly developed force field was used to study interactions of water with two singular surfaces of alpha-quartz, (011) and (100). Properties monitored and analyzed include the variation of the density of water molecules in the plane perpendicular to the surface, disruption of the water H-bond network upon adsorption, and space-time correlations of water oxygen atoms in terms of Van Hove self-correlation functions. The vibrational density of states spectra of water in confined compartments were also computed and compared with experimental neutron-scattering results. Both the attenuation and shifting to higher frequencies of the hindered translational peaks upon confinement are clearly reproduced by the model. However, an upshift of librational peaks under the conditions of model confinement still remains underrepresented at the current empirical level.
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Affiliation(s)
- Pedro E M Lopes
- National Institute for Occupational Safety and Health, Morgantown, West Virginia 26505, USA
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98
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Tripadus V, Gugiu M, Statescu M, Podlesnyak A. Molecular dynamics in ammonium dihydrogen phosphate using incoherent neutron scattering. Chem Phys 2007. [DOI: 10.1016/j.chemphys.2007.05.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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99
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Thompson H, Soper AK, Ricci MA, Bruni F, Skipper NT. The Three-Dimensional Structure of Water Confined in Nanoporous Vycor Glass. J Phys Chem B 2007; 111:5610-20. [PMID: 17472364 DOI: 10.1021/jp0677905] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Neutron diffraction data, in conjunction with isotopic substitution of deuterium (D) for hydrogen (H), have been analyzed to determine the three-dimensional structure of water confined in vycor, an archetypal hydrophilic porous silica glass containing channels or pores of approximately 40 A diameter. The data have been incorporated into a Monte Carlo computer simulation of the confined water system, and the site-site potentials have been iteratively refined in order to produce a model ensemble which is consistent with both the neutron diffraction data and two possible geometries of the vycor pores (cylindrical and spherical). This approach has allowed us to investigate in detail the contributions to the experimentally accessible partial pair correlation functions, and ascertain whether particular features arise from interactions of the water molecules with the substrate surface, or from purely geometrical confinement effects. We observe a significant decrease in the first shell water oxygen-oxygen co-ordination number, and a decrease in the number of hydrogen bonds per water molecule from approximately 3.6 in bulk water to approximately 2.2 in confinement. In addition, we observe a significant shift inward of the second peak in the water oxygen-water oxygen coordination shell. Overall, we therefore find that the structure of the water in vycor is strongly perturbed relative to the bulk.
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Affiliation(s)
- Helen Thompson
- ISIS Facility, Rutherford Appleton Laboratory, Didcot, OXON, OX11 0QX, United Kingdom
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100
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Abstract
The effect of confinement on the dynamical properties of liquid water is investigated for water enclosed in cationic reverse micelles. The authors performed mid-infrared ultrafast pump-probe spectroscopy on the OH-stretch vibration of isotopically diluted HDO in D(2)O in cetyltrimethylammonium bromide (CTAB) reverse micelles of various sizes. The authors observe that the surfactant counterions are inhomogeneously distributed throughout the reverse micelle, and that regions of extreme salinity occur near the interfacial Stern layer. The authors find that the water molecules in the core of the micelles show similar orientational dynamics as bulk water, and that water molecules in the counterion-rich interfacial region are much less mobile. An explicit comparison is made with the dynamics of water confined in anionic sodium bis(2-ethythexyl) sulfosuccinate (AOT) reverse micelles. The authors find that interfacial water in cationic CTAB reverse micelles has a higher orientational mobility than water in anionic AOT reverse micelles.
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Affiliation(s)
- Adriaan M Dokter
- FOM Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ Amsterdam, The Netherlands
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