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Mizuno Y, Zhao Y, Akiba H, Kohara S, Ohara K, Tucker MG, McDonnell MT, Yamamuro O. Intermolecular correlations of liquid and glassy CS2 studied by synchrotron radiation x-ray diffraction. J Chem Phys 2022; 156:034503. [DOI: 10.1063/5.0073210] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Yuki Mizuno
- Neutron Science Laboratory, Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
- Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1, Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan
| | - Yuansheng Zhao
- Neutron Science Laboratory, Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - Hiroshi Akiba
- Neutron Science Laboratory, Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - Shinji Kohara
- National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan
| | - Koji Ohara
- Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1, Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan
| | - Matthew G. Tucker
- Oak Ridge National Laboratory (ORNL), 1 Bethel Valley Road, Oak Ridge, Tennessee 37830, USA
| | - Marshall T. McDonnell
- Oak Ridge National Laboratory (ORNL), 1 Bethel Valley Road, Oak Ridge, Tennessee 37830, USA
| | - Osamu Yamamuro
- Neutron Science Laboratory, Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
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2
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Heyes DM. Translational and rotational diffusion of rod shaped molecules by molecular dynamics simulations. J Chem Phys 2019; 150:184503. [PMID: 31091888 DOI: 10.1063/1.5092958] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The results of molecular dynamics simulations of the dynamical evolution of assemblies of linear rigid rods of variable aspect ratio, a, and number density, ρ, in the isotropic phase are reported. The rods consist of m equally spaced sites interacting with the Weeks-Chandler-Andersen repulsive pair potential, where 2 < m < 16. With increasing m, features specific to long rods, such as anisotropic self-diffusion, become apparent. There is also an increasing separation between the characteristic relaxation times of the torque, angular velocity, and reorientational time correlation functions with increasing density. The latter is exponential at high densities even for dimers. The isotropic translational diffusion coefficient, Di, and rotational diffusion coefficient, Dr, are reported as a function of m and ρ or volume fraction, ξ. The mDi data scale with ξ throughout much of the simulated range, while the rotational diffusion coefficients scale approximately as m3Dr against ρ at low densities but as ∼m6Dr at high ρ, consistent with theories of colloidal and noncolloidal rod-containing liquids. The crossover density between the two regimes is parameterized in analytic form. The probability distribution functions for displacements and angular jumps in a given time show evidence of non-Gaussian behavior with increasing density. The shear viscosity and Di scale approximately as m and m-1, respectively, in the semidilute regime, which is consistent with a Stokes-Einstein-like relationship. At high concentrations, a frustrated or glassy structure formed in which the rods were randomly oriented.
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Affiliation(s)
- D M Heyes
- Department of Physics, Royal Holloway, University of London, Egham, Surrey TW20 0EX, United Kingdom
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Zalden P, Song L, Wu X, Huang H, Ahr F, Mücke OD, Reichert J, Thorwart M, Mishra PK, Welsch R, Santra R, Kärtner FX, Bressler C. Molecular polarizability anisotropy of liquid water revealed by terahertz-induced transient orientation. Nat Commun 2018; 9:2142. [PMID: 29849173 PMCID: PMC5976729 DOI: 10.1038/s41467-018-04481-5] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2017] [Accepted: 04/27/2018] [Indexed: 12/11/2022] Open
Abstract
Reaction pathways of biochemical processes are influenced by the dissipative electrostatic interaction of the reagents with solvent water molecules. The simulation of these interactions requires a parametrization of the permanent and induced dipole moments. However, the underlying molecular polarizability of water and its dependence on ions are partially unknown. Here, we apply intense terahertz pulses to liquid water, whose oscillations match the timescale of orientational relaxation. Using a combination of terahertz pump / optical probe experiments, molecular dynamics simulations, and a Langevin dynamics model, we demonstrate a transient orientation of their dipole moments, not possible by optical excitation. The resulting birefringence reveals that the polarizability of water is lower along its dipole moment than the average value perpendicular to it. This anisotropy, also observed in heavy water and alcohols, increases with the concentration of sodium iodide dissolved in water. Our results enable a more accurate parametrization and a benchmarking of existing and future water models. The intermolecular dynamics of liquid water impact most biological processes. Here, the authors use intense terahertz electromagnetic pulses to generate a transient, out-of-equilibrium state of the water network to show that the molecules become oriented and probe the polarizability of this anisotropic state.
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Affiliation(s)
- Peter Zalden
- Centre for Ultrafast Imaging CUI, University of Hamburg, 22761, Hamburg, Germany. .,European XFEL, Holzkoppel 4, 22869, Schenefeld, Germany.
| | - Liwei Song
- Center for Free-Electron Laser Science CFEL, Deutsches Elektronen-Synchrotron, 22607, Hamburg, Germany.,State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, 201800, Shanghai, China
| | - Xiaojun Wu
- Center for Free-Electron Laser Science CFEL, Deutsches Elektronen-Synchrotron, 22607, Hamburg, Germany.,School of Electronic and Information Engineering, Beihang University, 100191, Beijing, China
| | - Haoyu Huang
- Center for Free-Electron Laser Science CFEL, Deutsches Elektronen-Synchrotron, 22607, Hamburg, Germany
| | - Frederike Ahr
- Center for Free-Electron Laser Science CFEL, Deutsches Elektronen-Synchrotron, 22607, Hamburg, Germany
| | - Oliver D Mücke
- Centre for Ultrafast Imaging CUI, University of Hamburg, 22761, Hamburg, Germany.,Center for Free-Electron Laser Science CFEL, Deutsches Elektronen-Synchrotron, 22607, Hamburg, Germany
| | - Joscha Reichert
- Centre for Ultrafast Imaging CUI, University of Hamburg, 22761, Hamburg, Germany.,I. Institut für Theoretische Physik, University of Hamburg, Jungiusstr. 9, 20355, Hamburg, Germany
| | - Michael Thorwart
- Centre for Ultrafast Imaging CUI, University of Hamburg, 22761, Hamburg, Germany.,I. Institut für Theoretische Physik, University of Hamburg, Jungiusstr. 9, 20355, Hamburg, Germany
| | - Pankaj Kr Mishra
- Centre for Ultrafast Imaging CUI, University of Hamburg, 22761, Hamburg, Germany.,Center for Free-Electron Laser Science CFEL, Deutsches Elektronen-Synchrotron, 22607, Hamburg, Germany
| | - Ralph Welsch
- Center for Free-Electron Laser Science CFEL, Deutsches Elektronen-Synchrotron, 22607, Hamburg, Germany
| | - Robin Santra
- Centre for Ultrafast Imaging CUI, University of Hamburg, 22761, Hamburg, Germany.,Center for Free-Electron Laser Science CFEL, Deutsches Elektronen-Synchrotron, 22607, Hamburg, Germany.,Department of Physics, University of Hamburg, Jungiusstr. 9, 20355, Hamburg, Germany
| | - Franz X Kärtner
- Centre for Ultrafast Imaging CUI, University of Hamburg, 22761, Hamburg, Germany.,Center for Free-Electron Laser Science CFEL, Deutsches Elektronen-Synchrotron, 22607, Hamburg, Germany
| | - Christian Bressler
- Centre for Ultrafast Imaging CUI, University of Hamburg, 22761, Hamburg, Germany.,European XFEL, Holzkoppel 4, 22869, Schenefeld, Germany
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4
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Skarmoutsos I, Mossa S, Samios J. Structure and dynamics of liquid CS 2: Going from ambient to elevated pressure conditions. J Chem Phys 2016; 145:154505. [PMID: 27782484 DOI: 10.1063/1.4964816] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Molecular dynamics simulation studies were performed to investigate the structural and dynamic properties of liquid carbon disulfide (CS2) from ambient to elevated pressure conditions. The results obtained have revealed structural changes at high pressures, which are related to the more dense packing of the molecules inside the first solvation shell. The calculated neutron and X-ray structure factors have been compared with available experimental diffraction data, also revealing the pressure effects on the short-range structure of the liquid. The pressure effects on the translational, reorientational, and residence dynamics are very strong, revealing a significant slowing down when going from ambient pressure to 1.2 GPa. The translational dynamics of the linear CS2 molecules have been found to be more anisotropic at elevated pressures, where cage effects and librational motions are reflected on the shape of the calculated time correlation functions and their corresponding spectral densities.
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Affiliation(s)
- Ioannis Skarmoutsos
- Department of Chemistry, Laboratory of Physical Chemistry, University of Athens, Panepistimiopolis, 157-71 Athens, Greece
| | - Stefano Mossa
- INAC-SYMMES, CEA-Grenoble, 17 Rue des Martyrs, 38054 Grenoble, France
| | - Jannis Samios
- Department of Chemistry, Laboratory of Physical Chemistry, University of Athens, Panepistimiopolis, 157-71 Athens, Greece
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Brehm M, Kirchner B. TRAVIS - A Free Analyzer and Visualizer for Monte Carlo and Molecular Dynamics Trajectories. J Chem Inf Model 2011; 51:2007-23. [DOI: 10.1021/ci200217w] [Citation(s) in RCA: 745] [Impact Index Per Article: 57.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Martin Brehm
- Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie, Universität Leipzig, Linnéstrasse 2, D-04103 Leipzig, Germany
| | - Barbara Kirchner
- Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie, Universität Leipzig, Linnéstrasse 2, D-04103 Leipzig, Germany
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Prathiraja P, Daivis PJ, Snook IK. A molecular simulation study of shear viscosity and thermal conductivity of liquid carbon disulphide. J Mol Liq 2010. [DOI: 10.1016/j.molliq.2010.02.011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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8
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Rossi GC, Testa M. The stress tensor in thermodynamics and statistical mechanics. J Chem Phys 2010; 132:074902. [PMID: 20170246 DOI: 10.1063/1.3316134] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
We prove that the stress tensor, tau(ab), of a molecular system with arbitrary, short-range interactions can be point-wisely expressed as the functional derivative of the partition function with respect to the local deformation tensor. In this approach, the set of components of tau(ab) has a simple interpretation as the set of Lagrangian multipliers which one needs to introduce to enforce the conditions relating point particle displacements to the body local deformation tensor. The question of the possible nonuniqueness of the formula for tau(ab) is discussed.
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Affiliation(s)
- G C Rossi
- Dipartimento di Fisica, Università di Roma Tor Vergata INFN, Sezione di Roma Tor Vergata, Via della Ricerca Scientifica, I-00133 Roma, Italy.
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10
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Borysow A, Frommhold L. Collision-Induced Light Scattering: a Bibliography. ADVANCES IN CHEMICAL PHYSICS 2007. [DOI: 10.1002/9780470141243.ch7] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/17/2023]
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12
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Affiliation(s)
- Sarah L. Price
- a University Chemical Laboratory , Lensfield Road, Cambridge , CB2 1EW , UK
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Idrissi A, Longelin S, Damay P, Krishtal S, Kiselev M. Analysis of the transverse and the longitudinal pseudodiffusion of CO2 in sub- and supercritical states: a molecular-dynamics analysis. J Chem Phys 2006; 125:224501. [PMID: 17176143 DOI: 10.1063/1.2400855] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
We have performed molecular-dynamics simulations of CO(2) system along the gas-liquid coexistence curve and on the isochore 94.22 cm(3) mol(-1) (which corresponds to the critical isochore). The calculation has been carried out in order to analyze the diffusion of CO(2) and particularly to figure out how the diffusion coefficient may be decomposed along the molecular axes. This makes it possible to analyze the anisotropy of the diffusion along these axes and to shed light on the microscopic changes which accompany such behavior. This anisotropy is traced back to the effect of the translation-rotation coupling (TRC) along the molecular axes. Along the liquid-gas coexistence curve, the pseudolongitudinal diffusion is found to be more rapid than the transverse one. The opposite trend is found along the isochore 94.22 cm(3) mol(-1). The role of the local structure was explored by calculating intermediate scattering function and the autocorrelation functions for the forces acting along the molecular axes. It is shown that the strength of the TRC effect is correlated to the difference between the relaxation times of the local structure, that of the reorientation along the molecular axes, and that of the translational motion. The analysis of the correlation time and the average mean square force along the longitudinal and transverse directions confirms the anisotropy of the local environment that determines the translational dynamics of a molecule.
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Affiliation(s)
- A Idrissi
- Laboratoire de Spectrochimie Infrarouge et Raman (UMR CNRS A8516), Centre d'Etudes et de Recherches Lasers et Applications, Université des Sciences et Technologies de Lille, 59655 Villeneuve d'Ascq Cedex, France.
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Jose PP, Bagchi B. Multiple short time power laws in the orientational relaxation of nematic liquid crystals. J Chem Phys 2006; 125:184901. [PMID: 17115789 DOI: 10.1063/1.2364188] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Relaxation in the nematic liquid crystalline phase is known to be sensitive to its proximity to both isotropic and smectic phases. Recent transient optical Kerr effect (OKE) studies have revealed, rather surprisingly, two temporal power laws at short to intermediate times and also an apparent absence of the expected exponential decay at longer times. In order to understand this unusual dynamics, we have carried out extensive molecular dynamics simulations of transient OKE and related orientational time correlation functions in a system of prolate ellipsoids (with aspect ratio equal to 3). The simulations find two distinct power laws, with a crossover region, in the decay of the orientational time correlation function at short to intermediate times (in the range of a few picoseconds to a few nanoseconds). In addition, the simulation results fail to recover any long time exponential decay component. The system size dependence of the exponents suggests that the first power law may originate from the local orientational density fluctuations (like in a glassy liquid). The origin of the second power law is less clear and may be related to the long range fluctuations (such as smecticlike density fluctuations)--these fluctuations are expected to involve small free energy barriers. In support of the latter, the evidence of pronounced coupling between orientational and spatial densities at intermediate wave numbers is presented. This coupling is usually small in normal isotropic liquids, but it is large in the present case. In addition to slow collective orientational relaxation, the single particle orientational relaxation is also found to exhibit slow dynamics in the nematic phase in the long time.
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Affiliation(s)
- Prasanth P Jose
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, USA
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15
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Eskandari Nasrabad A, Laghaei R. Theoretical and computational investigations on thermodynamic properties, effective site diameters, and molecular free volume of carbon disulfide fluid. J Chem Phys 2006; 125:154505. [PMID: 17059270 DOI: 10.1063/1.2358132] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
A newly proposed theory [R. Laghaei et al., J. Chem. Phys. 124, 154502 (2006)] was extended to polyatomics and applied to compute the density and temperature dependence of the effective site diameters of carbon disulfide fluids. The generic van der Waals (GvdW) theory was also extended to polyatomics in order to calculate the GvdW parameters and the molecular free volume using the effective site diameters as the repulsion-attraction separation distance. A three-site Lennard-Jones potential available in the literature was slightly modified and used in Monte Carlo simulations to obtain the functions appearing in the effective site diameter and GvdW expressions. The interaction potential was examined to reproduce the fluid phase thermodynamic properties using Gibbs ensemble Monte Carlo simulations and also the equation of state in the liquid phase using NVT Monte Carlo (NVT-MC) simulations. Comparison between the simulation results and experimental data shows excellent agreement for the densities of the coexisting phases, the vapor pressure, properties of the predicted critical point, and the equation of state. NVT-MC simulations were performed over a wide range of densities and temperatures in sub- and supercritical regions to compute the effective site diameters, the GvdW parameters, and the molecular free volume. The molecular structure in terms of the site-site pair correlation functions, the density dependence of the effective site diameters, and the density and temperature dependence of the GvdW parameters and molecular free volume were studied and discussed. The GvdW parameters were fitted to empirical expressions as a function of density and temperature. The computed molecular free volume will be used in future investigations to study the transport properties of carbon disulfide.
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Frattini R, Gazzillo D, Sampoli M, Vallauri R. On the Possibility of Finding a Suitable Potential Model For Liquid CO2. MOLECULAR SIMULATION 2006. [DOI: 10.1080/08927028908031385] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- R. Frattini
- a Dip. Chimica Fisica , University of Venice , Italy
| | - D. Gazzillo
- a Dip. Chimica Fisica , University of Venice , Italy
| | - M. Sampoli
- b Dept. Energetics , University of Florence , Italy
| | - R. Vallauri
- c Ist. di Elettronica Quantistica , C.N.R. Via Panciatichi 56/30, 50127 , Firenze , Italy
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Idrissi A, Damay P, Krishtal S, Kiselev M. Analysis of the Effect of Translation−Rotation Coupling on Diffusion along the Molecular Axes. J Phys Chem B 2006; 110:18560-5. [PMID: 16970484 DOI: 10.1021/jp061194t] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The analysis of the microscopic diffusion processes of CO(2) and H(2)O in the coordinate system defined by the molecular orientation allows a new criterion to be introduced which provides information on the short and long time behavior of the rotation-translation coupling as well as to quantify the strength of this coupling. We discuss the general conditions under which this affects the translation diffusion "seen" by the molecule along its molecular axes. The results show that the translation-rotation coupling is correlated to the local environment in shaping the longitudinal and transversal translation dynamics of a molecule at a microscopic level.
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Affiliation(s)
- A Idrissi
- Laboratoire de Spectrochimie Infrarouge et Raman (UMR CNRS A8516), Centre d'Etudes et de Recherches Lasers et Applications, Université des Sciences et Technologies de Lille, 59655 Villeneuve d'Ascq Cedex, France
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18
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Lynden-Bell R, Talbot J, Tildesley D, Steele W. Reorientation of N2adsorbed on graphite in various computer simulated phases. Mol Phys 2006. [DOI: 10.1080/00268978500100151] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Böhm H, Lynden-Bell R, Madden P, McDonald I. Molecular motion in a model of liquid acetonitrile. Mol Phys 2006. [DOI: 10.1080/00268978400100501] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- H.J. Böhm
- a Department of Physical Chemistry , Lensfield Road, Cambridge , CB2 1EP , England
- b Institut für Physikalische Chemie und Elektrochemie, Universität Karlsruhe , 75 Karlsruhe , F.R. Germany
| | - R.M. Lynden-Bell
- c Theoretical Chemistry Department , University Chemical Laboratory , Lensfield Road, Cambridge , CB2 1EW , England
| | - P.A. Madden
- c Theoretical Chemistry Department , University Chemical Laboratory , Lensfield Road, Cambridge , CB2 1EW , England
- d The Royal Signals and Radar Establishment , Malvern , Worcestershire , WR14 3PS , England
| | - I.R. McDonald
- e Department of Physical Chemistry , Lensfield Road, Cambridge , CB2 1EP , England
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Dorfmüller T, Samios J. A molecular dynamics simulation of interaction-induced dipole correlation functions in liquid CS2. Mol Phys 2006. [DOI: 10.1080/00268978400102921] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Zhu SB, Lee J, Robinson G. Molecular dynamics simulation of liquid carbon disulphide with a harmonic intramolecular potential. Mol Phys 2006. [DOI: 10.1080/00268978800100851] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- S.-B. Zhu
- a Picosecond and Quantum Radiation Laboratory , Texas Tech University , P.O. Box 4260, Lubbock , Texas , 79409 , U.S.A
| | - J. Lee
- a Picosecond and Quantum Radiation Laboratory , Texas Tech University , P.O. Box 4260, Lubbock , Texas , 79409 , U.S.A
| | - G.W. Robinson
- a Picosecond and Quantum Radiation Laboratory , Texas Tech University , P.O. Box 4260, Lubbock , Texas , 79409 , U.S.A
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Edwards DM, Madden PA, McDonald IR. A computer simulation study of the dielectric properties of a model of methyl cyanide. Mol Phys 2006. [DOI: 10.1080/00268978400100731] [Citation(s) in RCA: 160] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Böhm H, Meissner C, Ahlrichs R. Molecular dynamics simulation of liquid CH3F, CHF3, CH3Cl, CH3CN, CO2and CS2with new pair potentials. Mol Phys 2006. [DOI: 10.1080/00268978400102581] [Citation(s) in RCA: 93] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Willeke * M. Translation–rotation coupling in the self–diffusion of fluids: molecular dynamic investigation and a generalized exponential approach. Mol Phys 2005. [DOI: 10.1080/00268970500038410] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Idrissi A. Molecular structure and dynamics of liquids: aqueous urea solutions. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2005; 61:1-17. [PMID: 15556415 DOI: 10.1016/j.saa.2004.02.039] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2003] [Accepted: 02/23/2004] [Indexed: 05/24/2023]
Abstract
In this review a multi-technical approach to the analysis of the structure and dynamics of the urea/water system is described. The reorientational movement of the solute molecule is investigated by the analysis of spectral band-shapes, as well as with the use of the optical Kerr effect (OKE) and molecular dynamics simulation (MDS). The effect of solute concentration on the structure and dynamics of the aqueous solutions (aggregation, orientational distribution, solvation...) is studied by molecular dynamics simulation and neutron scattering. The results obtained by other techniques are included to provide a critical analysis. Finally, the low-frequency Raman spectra of the system are interpreted on the basis of the semi-quantitative information obtained by molecular dynamics simulation.
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Affiliation(s)
- A Idrissi
- Laboratoire de Spectrochimie Infrarouge et Raman (LASIR UPR A2632L), Centre d'Etudes et de Recherches Lasers et Applications, Université des Sciences et Technologies de Lille, 59655 Villeneuve d'Ascq Cedex, France.
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Cheung DL, Clark SJ, Wilson MR. Calculation of flexoelectric coefficients for a nematic liquid crystal by atomistic simulation. J Chem Phys 2004; 121:9131-9. [PMID: 15527381 DOI: 10.1063/1.1802231] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Equilibrium molecular dynamics calculations have been performed for the liquid crystal molecule n-4-(trans-4-n-pentylcyclohexyl)benzonitrile (PCH5) using a fully atomistic model. Simulation data have been obtained for a series of temperatures in the nematic phase. The simulation data have been used to calculate the flexoelectric coefficients e(s) and e(b) using the linear response formalism of Osipov and Nemtsov [M. A. Osipov and V. B. Nemtsov, Sov. Phys. Crstallogr. 31, 125 (1986)]. The temperature and order parameter dependence of e(s) and e(b) are examined, as are separate contributions from different intermolecular interactions. Values of e(s) and e(b) calculated from simulation are consistent with those found from experiment.
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Affiliation(s)
- David L Cheung
- Department of Chemistry, University of Durham, South Road, Durham DH1 3LE, United Kingdom
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Jose PP, Bagchi B. In search of temporal power laws in the orientational relaxation near isotropic–nematic phase transition in model nematogens. J Chem Phys 2004; 120:11256-66. [PMID: 15268154 DOI: 10.1063/1.1742942] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Recent Kerr relaxation experiments by Gottke et al. have revealed the existence of a pronounced temporal power law decay in the orientational relaxation near the isotropic-nematic phase transition (INPT) of nematogens of rather small aspect ratio, kappa (kappa approximately 3-4). We have carried out very long (50 ns) molecular dynamics simulations of model (Gay-Berne) prolate ellipsoids with aspect ratio 3 in order to investigate the origin of this power law. The model chosen is known to undergo an isotropic to nematic phase transition for a range of density and temperature. The distance dependence of the calculated angular pair correlation function correctly shows the emergence of a long range correlation as the INPT is approached along the density axis. In the vicinity of INPT, the single particle second rank orientational time correlation function exhibits power law decay, (t(-alpha)) with exponent alpha approximately 2/3. More importantly, we find the sudden appearance of a pronounced power-law decay in the collective part of the second rank orientational time correlation function at short times when the density is very close to the transition density. The power law has an exponent close to unity, that is, the correlation function decays almost linearly with time. At long times, the decay is exponential-like, as predicted by Landau-de Gennes mean field theory. Since Kerr relaxation experiments measure the time derivative of the collective second rank orientational pair correlation function, the simulations recover the near independence of the signal on time observed in experiments. In order to capture the microscopic essence of the dynamics of pseudonematic domains inside the isotropic phase, we introduce and calculate a dynamic orientational pair correlation function (DOPCF) obtained from the coefficients in the expansion of the distinct part of orientational van Hove time correlation function in terms of spherical harmonics. The DOPCF exhibits power law relaxation when the pair separation length is below certain critical length. The orientational relaxation of a local director, defined in terms of the sum of unit vectors of all the ellipsoidal molecules, is also found to show slow power law relaxation over a long time scale. These results have been interpreted in terms of a newly developed mode coupling theory of orientational dynamics near the INPT. In the present case, the difference between the single particle and the collective orientational relaxation is huge which can be explained by the frequency dependence of the memory kernel, calculated from the mode coupling theory. The relationship of this power law with the one observed in a supercooled liquid near its glass transition temperature is explored.
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Affiliation(s)
- Prasanth P Jose
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India.
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Kim J, Li WX, Keyes T. Probes of heterogeneity in rotational dynamics: application to supercooled liquid CS2. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2003; 67:021506. [PMID: 12636683 DOI: 10.1103/physreve.67.021506] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2002] [Indexed: 05/24/2023]
Abstract
The distribution of individual molecular contributions to the second-rank rotational correlation function is introduced and used to construct probes of heterogeneity in rotational dynamics. The ideas are tested in a molecular dynamics simulation of supercooled liquid CS2. Both the quantity of heterogeneity and its lifetime or exchange time tau(ex) increase as the temperature is lowered through the supercooled state, and increase strongly as the mode-coupling temperature T(c) is approached. Crossover from Arrhenius to super-Arrhenius behavior of the rotational relaxation times tau(1) and tau(2) is observed, direct evidence of fragility in CS2. The T dependence of tau(ex) is stronger than that of the rotational times, and it may approach them from below at T(c), although the simulation is then very difficult. A detailed characterization of other aspects of the dynamical crossover is obtained, and the general implications of rotational heterogeneity for supercooled dynamics are discussed.
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Affiliation(s)
- Joohyun Kim
- Department of Chemistry, Boston University, Boston, Massachusetts 02215, USA
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van Klaveren EP, Michels JPJ, Schouten JA, Klug DD, Tse JS. Computer simulations of the dynamics of doubly occupied N2 clathrate hydrates. J Chem Phys 2002. [DOI: 10.1063/1.1502645] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Utz N, Koslowski T. Variational approach to charge transfer reactions in bridged triarylamine cations. Chem Phys 2002. [DOI: 10.1016/s0301-0104(02)00732-2] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Jansen TLC, Pugzlys A, Crı̂nguş GD, Snijders JG, Duppen K. Many-body effects in the stimulated Raman response of binary mixtures: A comparison between theory and experiment. J Chem Phys 2002. [DOI: 10.1063/1.1475763] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
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Chatzis G, Samios J. Estimation of the Interaction-Induced Effects on the Far-Infrared and Infrared Correlation Functions of HCl Dissolved in CCl4: A Molecular Dynamics Study. J Phys Chem A 2001. [DOI: 10.1021/jp011602n] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- George Chatzis
- Laboratory of Physical Chemistry, Department of Chemistry, University of Athens, Panepistimiopolis 15771, Athens, Greece
| | - Jannis Samios
- Laboratory of Physical Chemistry, Department of Chemistry, University of Athens, Panepistimiopolis 15771, Athens, Greece
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Ozisik R, Doruker P, Mattice W, von Meerwall E. Translational diffusion in Monte Carlo simulations of polymer melts: center of mass displacement vs. integrated velocity autocorrelation function. ACTA ACUST UNITED AC 2000. [DOI: 10.1016/s1089-3156(00)00008-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Calero S, Garzón B, Jorge S, Mejías, Tortajada J, Lago S. Suitability of the Kihara Potential To Predict Molecular Spectra of Linear Polyatomic Liquids. J Phys Chem B 2000. [DOI: 10.1021/jp993904j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- S. Calero
- Facultad de Ciencias Experimentales, Carretera de Utrera, Km 1, Universidad Pablo de Olavide, 41013 Seville, Spain; Departamento Química Física, Facultad de Ciencias Químicas, Universidad Complutense, 28040 Madrid, Spain; and Departamento Ciencias Básicas, Facultad de Ciencias Experimentales y Técnicas, Universidad San Pablo CEU, Urbanización Montepríncipe, Boadilla del Monte, 28660 Madrid, Spain
| | - B. Garzón
- Facultad de Ciencias Experimentales, Carretera de Utrera, Km 1, Universidad Pablo de Olavide, 41013 Seville, Spain; Departamento Química Física, Facultad de Ciencias Químicas, Universidad Complutense, 28040 Madrid, Spain; and Departamento Ciencias Básicas, Facultad de Ciencias Experimentales y Técnicas, Universidad San Pablo CEU, Urbanización Montepríncipe, Boadilla del Monte, 28660 Madrid, Spain
| | - S. Jorge
- Facultad de Ciencias Experimentales, Carretera de Utrera, Km 1, Universidad Pablo de Olavide, 41013 Seville, Spain; Departamento Química Física, Facultad de Ciencias Químicas, Universidad Complutense, 28040 Madrid, Spain; and Departamento Ciencias Básicas, Facultad de Ciencias Experimentales y Técnicas, Universidad San Pablo CEU, Urbanización Montepríncipe, Boadilla del Monte, 28660 Madrid, Spain
| | - Mejías
- Facultad de Ciencias Experimentales, Carretera de Utrera, Km 1, Universidad Pablo de Olavide, 41013 Seville, Spain; Departamento Química Física, Facultad de Ciencias Químicas, Universidad Complutense, 28040 Madrid, Spain; and Departamento Ciencias Básicas, Facultad de Ciencias Experimentales y Técnicas, Universidad San Pablo CEU, Urbanización Montepríncipe, Boadilla del Monte, 28660 Madrid, Spain
| | - J. Tortajada
- Facultad de Ciencias Experimentales, Carretera de Utrera, Km 1, Universidad Pablo de Olavide, 41013 Seville, Spain; Departamento Química Física, Facultad de Ciencias Químicas, Universidad Complutense, 28040 Madrid, Spain; and Departamento Ciencias Básicas, Facultad de Ciencias Experimentales y Técnicas, Universidad San Pablo CEU, Urbanización Montepríncipe, Boadilla del Monte, 28660 Madrid, Spain
| | - S. Lago
- Facultad de Ciencias Experimentales, Carretera de Utrera, Km 1, Universidad Pablo de Olavide, 41013 Seville, Spain; Departamento Química Física, Facultad de Ciencias Químicas, Universidad Complutense, 28040 Madrid, Spain; and Departamento Ciencias Básicas, Facultad de Ciencias Experimentales y Técnicas, Universidad San Pablo CEU, Urbanización Montepríncipe, Boadilla del Monte, 28660 Madrid, Spain
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De Santis A, Ercoli A, Rocca D. On the short time motion of hydrogen-bonded molecules in supercooled water. J Chem Phys 1999. [DOI: 10.1063/1.479741] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Xiang. Translational Diffusion in Lipid Bilayers: Dynamic Free-Volume Theory and Molecular Dynamics Simulation. J Phys Chem B 1998. [DOI: 10.1021/jp9836731] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Xiang
- Department of Pharmaceutics and Pharmaceutical Chemistry, University of Utah, Salt Lake City, Utah 84112
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M. IN HET PANHUIS C. H. PATTERSON R. A molecular dynamics study of carbon dioxide in water: diffusion, structure and thermodynamics. Mol Phys 1998. [DOI: 10.1080/002689798167539] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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CARL MCBRIDE MARK R. WILSON JUDITH. Molecular dynamics simulations of liquid crystal phases using atomistic potentials. Mol Phys 1998. [DOI: 10.1080/002689798168655] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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45
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Temperature dependence of single particle dynamics of flexible liquid tetrachloromethane using molecular dynamics simulation. J Mol Liq 1998. [DOI: 10.1016/s0167-7322(98)82001-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Laaksonen A, Stilbs P, Wasylishen RE. Molecular motion and solvation of benzene in water, carbon tetrachloride, carbon disulfide and benzene: A combined molecular dynamics simulation and nuclear magnetic resonance study. J Chem Phys 1998. [DOI: 10.1063/1.475408] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Saito S, Ohmine I. Off-resonant fifth-order nonlinear response of water and CS2: Analysis based on normal modes. J Chem Phys 1998. [DOI: 10.1063/1.475375] [Citation(s) in RCA: 147] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Stassen H, Steele WA. Translational and Rotational Contributions to the Quadrupole-Induced Dipole Absorption in Liquid CS2. J Phys Chem B 1997. [DOI: 10.1021/jp970096s] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hubert Stassen
- Departamento de Física-Química, Instituto de Química, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 9500, 91540-000 Porto Alegre-RS, Brazil, and Department of Chemistry, Pennsylvania State University, University Park, Pennsylvania 16802
| | - William A. Steele
- Departamento de Física-Química, Instituto de Química, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 9500, 91540-000 Porto Alegre-RS, Brazil, and Department of Chemistry, Pennsylvania State University, University Park, Pennsylvania 16802
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Fedchenia II, Schröder J. Local orientational correlations and short time anisotropic motion in molecular liquids: Computer simulations of liquid CO2. J Chem Phys 1997. [DOI: 10.1063/1.473775] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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50
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MacDowell LG, Garzón B, Calero S, Lago S. Dynamical properties and transport coefficients of Kihara linear fluids. J Chem Phys 1997. [DOI: 10.1063/1.473473] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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