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Luo P, Zhai Y, Falus P, García Sakai V, Hartl M, Kofu M, Nakajima K, Faraone A, Z Y. Q-dependent collective relaxation dynamics of glass-forming liquid Ca 0.4K 0.6(NO 3) 1.4 investigated by wide-angle neutron spin-echo. Nat Commun 2022; 13:2092. [PMID: 35440658 PMCID: PMC9018732 DOI: 10.1038/s41467-022-29778-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2021] [Accepted: 03/29/2022] [Indexed: 11/30/2022] Open
Abstract
The relaxation behavior of glass formers exhibits spatial heterogeneity and dramatically changes upon cooling towards the glass transition. However, the underlying mechanisms of the dynamics at different microscopic length scales are not fully understood. Employing the recently developed wide-angle neutron spin-echo spectroscopy technique, we measured the Q-dependent coherent intermediate scattering function of a prototypical ionic glass former Ca0.4K0.6(NO3)1.4, in the highly viscous liquid state. In contrast to the structure modulated dynamics for Q < 2.4 Å−1, i.e., at and below the structure factor main peak, for Q > 2.4 Å−1, beyond the first minimum above the structure factor main peak, the stretching exponent exhibits no temperature dependence and concomitantly the relaxation time shows smaller deviations from Arrhenius behavior. This finding indicates a change in the dominant relaxation mechanisms around a characteristic length of 2π/(2.4 Å−1) ≈ 2.6 Å, below which the relaxation process exhibits a temperature independent distribution and more Arrhenius-like behavior. Length scale dependence is important for understanding the collective relaxation dynamics in glass-forming liquids. Here, the authors find in liquid Ca0.4K0.6(NO3)1.4 a change in the dominant relaxation mechanisms around 2.6 Å, below which the relaxation process exhibits a temperature independent distribution and more Arrhenius-like behavior.
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Affiliation(s)
- Peng Luo
- Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA
| | - Yanqin Zhai
- Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA.,Department of Nuclear, Plasma, and Radiological Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA
| | - Peter Falus
- Institut Laue-Langevin (ILL), 38042, Grenoble, France
| | - Victoria García Sakai
- ISIS Neutron and Muon Facility, Rutherford Appleton Laboratory, Science & Technology Facilities Council, Didcot, OX11 0QX, UK
| | - Monika Hartl
- European Spallation Source, SE-221 00, Lund, Sweden
| | - Maiko Kofu
- J-PARC Center, Japan Atomic Energy Agency, Tokai, Ibaraki, 319-1195, Japan
| | - Kenji Nakajima
- J-PARC Center, Japan Atomic Energy Agency, Tokai, Ibaraki, 319-1195, Japan
| | - Antonio Faraone
- NIST Center for Neutron Research, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD, 20899-1070, USA.
| | - Y Z
- Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA. .,Department of Nuclear, Plasma, and Radiological Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA. .,Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA.
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2
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The Proton Density of States in Confined Water (H 2O). Int J Mol Sci 2019; 20:ijms20215373. [PMID: 31671726 PMCID: PMC6861890 DOI: 10.3390/ijms20215373] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2019] [Revised: 10/17/2019] [Accepted: 10/24/2019] [Indexed: 12/05/2022] Open
Abstract
The hydrogen density of states (DOS) in confined water has been probed by inelastic neutron scattering spectra in a wide range of its P–T phase diagram. The liquid–liquid transition and the dynamical crossover from the fragile (super-Arrhenius) to strong (Arrhenius) glass forming behavior have been studied, by taking into account the system polymorphism in both the liquid and amorphous solid phases. The interest is focused in the low energy region of the DOS (E<10 meV) and the data are discussed in terms of the energy landscape (local minima of the potential energy) approach. In this latest research, we consider a unit scale energy (EC) linked to the water local order governed by the hydrogen bonding (HB). All the measured spectra, scaled according to such energy, evidence a universal power law behavior with different exponents (γ) in the strong and fragile glass forming regions, respectively. In the first case, the DOS data obey the Debye squared-frequency law, whereas, in the second one, we obtain a value predicted in terms of the mode-coupling theory (MCT) (γ≃1.6).
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Sibik J, Zeitler JA. Direct measurement of molecular mobility and crystallisation of amorphous pharmaceuticals using terahertz spectroscopy. Adv Drug Deliv Rev 2016; 100:147-57. [PMID: 26772139 DOI: 10.1016/j.addr.2015.12.021] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2015] [Revised: 12/23/2015] [Accepted: 12/24/2015] [Indexed: 11/26/2022]
Abstract
Despite much effort in the area, no comprehensive understanding of the formation and behaviour of amorphous solids has yet been achieved. This severely limits the industrial application of such materials, including drug delivery where, in principle, amorphous solids have demonstrated their great usefulness in increasing the bioavailability of poorly aqueous soluble active pharmaceutical ingredients. Terahertz time-domain spectroscopy is a relatively novel analytical technique that can be used to measure the fast molecular dynamics of molecules with high accuracy in a non-contact and non-destructive fashion. Over the past decade a number of applications for the characterisation of amorphous drug molecules and formulations have been developed and it has been demonstrated how this technique can be used to determine the onset and strength in molecular mobility that underpins the crystallisation of amorphous drugs. In this review we provide an overview of the history, fundamentals and future perspective of pharmaceutical applications related to the terahertz dynamics of amorphous systems.
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Kofu M, Inamura Y, Moriya Y, Podlesnyak A, Ehlers G, Yamamuro O. Inelastic neutron scattering study on boson peaks of imidazolium-based ionic liquids. J Mol Liq 2015. [DOI: 10.1016/j.molliq.2015.07.021] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Cummins HZ, Li G, Du W, Hwang YH, Shen GQ. Light Scattering Spectroscopy of Orthoterphenyl: Idealized and Extended Mode Coupling Analysis. ACTA ACUST UNITED AC 2013. [DOI: 10.1143/ptp.126.21] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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6
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Langer JS. Anomalous diffusion in heterogeneous glass-forming liquids: temperature-dependent behavior. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2008; 78:051115. [PMID: 19113103 DOI: 10.1103/physreve.78.051115] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2008] [Indexed: 05/27/2023]
Abstract
In a preceding paper, Langer and Mukhopadhyay [Phys. Rev. E 77, 061505 (2008)] studied the diffusive motion of a tagged molecule in an heterogeneous glass-forming liquid at temperatures just above a glass transition. Among other features of this system, we postulated a relation between heterogeneity and stretched-exponential decay of correlations, and we also confirmed that systems of this kind generally exhibit non-Gaussian diffusion on intermediate length and time scales. Here I extend this analysis to higher temperatures approaching the point where the heterogeneities disappear and thermal activation barriers become small. I start by modifying the continuous-time random-walk theory proposed in Langer and Mukhopadhyay and supplement this analysis with an extension of the excitation-chain theory of glass dynamics. I also use a key result from the shear-transformation-zone theory of viscous deformation of amorphous materials. Elements of each of these theories are then used to interpret experimental data for orthoterphenyl, specifially, the diffusion and viscosity coefficients and neutron-scattering measurements of the self-intermediate scattering function. Reconciling the theory with these data sets provides insights into the crossover between super-Arrhenius and Arrhenius dynamics, length scales of spatial heterogeneities, violation of the Stokes-Einstein relation in glass-forming liquids, and the origin of stretched-exponential decay of correlations.
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Affiliation(s)
- J S Langer
- Department of Physics, University of California, Santa Barbara, California 93106-9530, USA
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Capaccioli S, Thayyil MS, Ngai KL. Critical Issues of Current Research on the Dynamics Leading to Glass Transition. J Phys Chem B 2008; 112:16035-49. [DOI: 10.1021/jp8057433] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- S. Capaccioli
- Dipartimento di Fisica, Università di Pisa and CNR-INFM, polylab, Largo Bruno Pontecorvo, 3, I-56127 Pisa, Italy
| | - M. Shahin Thayyil
- Dipartimento di Fisica, Università di Pisa, Largo Bruno Pontecorvo, 3, I-56127 Pisa, Italy, and Department of Physics, University of Calicut, Kerala, India
| | - K. L. Ngai
- Naval Research Laboratory, Washington, DC 20375-5320
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Narros A, Arbe A, Alvarez F, Colmenero J, Richter D. Atomic motions in the alphabeta-merging region of 1,4-polybutadiene: a molecular dynamics simulation study. J Chem Phys 2008; 128:224905. [PMID: 18554051 DOI: 10.1063/1.2937733] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We present fully atomistic molecular dynamics simulations on 1,4-polybutadiene in a wide temperature range from 200 to 280 K, i.e., in the region where the alpha- and beta-relaxations merge and above. A big computational effort has been performed-especially for the lowest temperatures investigated-to extend the simulation runs to very long times (up to 1 mus for 200 K). The simulated sample has been carefully validated by using previous neutron scattering data on the real sample with similar microstructure. Inspecting the trajectories of the different hydrogens in real space, we have observed a heterogeneous dynamical behavior (each kind of hydrogen moves in a different way) with signatures of combined hopping and diffusive motions in the whole range investigated. The application of a previously proposed model [Colmenero et al., Europhys. Lett. 71, 262 (2005)] is successful and a characterization of the local motions and diffusion is possible. The comparison of our results to those reported in the literature provides a consistent scenario for polybutadiene dynamics and puts into a context the different experimental observations. We also discuss the impact of the hopping processes on the observation and interpretation of experimentally accessible magnitudes and the origin of the deviations from Gaussian behavior in this system.
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Affiliation(s)
- A Narros
- Departamento de Física de Materiales UPV/EHU, Apartado 1072, 20080 San Sebastián, Spain
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Dudowicz J, Freed KF, Douglas JF. Generalized Entropy Theory of Polymer Glass Formation. ADVANCES IN CHEMICAL PHYSICS 2008. [DOI: 10.1002/9780470238080.ch3] [Citation(s) in RCA: 106] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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10
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Petry W, Wuttke J. Quasielastic neutron scattering in glass forming viscous liquids. ACTA ACUST UNITED AC 2006. [DOI: 10.1080/00411459508203945] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- W. Petry
- a Physikdepartement E13 , Technische Universität München , 85747 , Garching , GERMANY
| | - J. Wuttke
- a Physikdepartement E13 , Technische Universität München , 85747 , Garching , GERMANY
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11
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Torell LM, Börjesson L, Sokoiov AP. The liquid-glass transition in a strong glassformer. ACTA ACUST UNITED AC 2006. [DOI: 10.1080/00411459508203946] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- L. M. Torell
- a Department of Physics , Chalmers University of Technology , S-412 96 , Göteborg , Sweden
| | - L. Börjesson
- b Department of Physics , Royal Institute of Technology , S-100 44 , Stockholm , Sweden
| | - A. P. Sokoiov
- c Max-Planck-Institut für Polymerforschung , D-6500 , Mainz , Germany
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12
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Affiliation(s)
- A. Criado
- a Departamento de Física de la Materia Condensada , Instituto de Ciencia de Materiales, Universidad de Sevilla , P.O. Boc 1065, E-41080 , Sevilla , Spain
| | - F.J. Bermejo
- b Instituto de Estructura de la Materia, Consejo Superior de Investigaciones Científicas , Serrano 123, E-28006 , Madrid , Spain
| | - M. Garcia-Hernández
- b Instituto de Estructura de la Materia, Consejo Superior de Investigaciones Científicas , Serrano 123, E-28006 , Madrid , Spain
| | - J.L. Martinez
- c Instituto de Ciencia de Materials, C.S.I.C , Universidad Autónoma de Madrid , E-28049 , Madrid , Spain
- d Departamento de Física de Materiales C-IV , Universidad Autónoma de Madrid , E-28049 , Madrid , Spain
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13
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Criado A, Bermejo F, de Andres A, Martinez J. Microscopic dynamics of ortho-terphenyl in its polycrystalline and glassy forms. Mol Phys 2006. [DOI: 10.1080/00268979400100564] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- A. Criado
- a Instituto de Ciencia de Materiales, Consejo Superior de Investigaciones Cientificas , P.O. Box 1065, E-41080 , Sevilla , Spain
- b Departamento de Fisica de la Materia Condensada , Universidad de Sevilla , P.O. Box 1065, E-41080 , Sevilla , Spain
| | - F.J. Bermejo
- c Instituto de Estructura de la Materia, Consejo Superior de Investigaciones Cientificas , Serrano 123, E-28006 , Madrid , Spain
| | - A. de Andres
- d Instituto de Ciencia de Materiales, C.S.I.C. , E-28049 , Madrid , Spain
- e Departamento de Fisica de Materiales C-IV , Universidad Autónoma de Madrid , E-28049 , Madrid , Spain
| | - J.L. Martinez
- d Instituto de Ciencia de Materiales, C.S.I.C. , E-28049 , Madrid , Spain
- e Departamento de Fisica de Materiales C-IV , Universidad Autónoma de Madrid , E-28049 , Madrid , Spain
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14
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Teboul V, Alba-Simionesco C. Dynamical heterogeneity in glass-forming toluene: Comparison of bulk and confined conditions by quasielastic neutron scattering and molecular dynamics simulations. Chem Phys 2005. [DOI: 10.1016/j.chemphys.2005.05.010] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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15
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Chong SH, Sciortino F. Structural relaxation in supercooled orthoterphenyl. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2004; 69:051202. [PMID: 15244813 DOI: 10.1103/physreve.69.051202] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2003] [Indexed: 05/24/2023]
Abstract
We report molecular-dynamics simulation results performed for a model of molecular liquid orthoterphenyl in supercooled states, which we then compare with both experimental data and mode-coupling-theory (MCT) predictions, aiming at a better understanding of structural relaxation in orthoterphenyl. We pay special attention to the wave number dependence of the collective dynamics. It is shown that the simulation results for the model share many features with experimental data for real system, and that MCT captures the simulation results at the semiquantitative level except for intermediate wave numbers connected to the overall size of the molecule. Theoretical results at the intermediate wave number region are found to be improved by taking into account the spatial correlation of the molecule's geometrical center. This supports the idea that unusual dynamical properties at the intermediate wave numbers, reported previously in simulation studies for the model and discernible in coherent neutron-scattering experimental data, are basically due to the coupling of the rotational motion to the geometrical-center dynamics. However, there still remain qualitative as well as quantitative discrepancies between theoretical prediction and corresponding simulation results at the intermediate wave numbers, which call for further theoretical investigation.
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Affiliation(s)
- S-H Chong
- Dipartimento di Fisica and Istituto Nazionale per la Fisica della Materia, Center for Statistical Mechanics and Complexity, Università di Roma "La Sapienza," Piazzale Aldo Moro 2, I-00185, Roma, Italy
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16
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Arrese-Igor S, Arbe A, Alegría A, Colmenero J, Frick B. Phenylene ring dynamics in bisphenol-A-polysulfone by neutron scattering. J Chem Phys 2004; 120:423-36. [PMID: 15267305 DOI: 10.1063/1.1630013] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We have investigated the dynamics of phenylene rings in a glassy polysulfone (bisphenol-A-polysulfone) by means of quasielastic neutron scattering. Nowadays it is well known that these molecular motions are directly connected with the mechanical properties of engineering thermoplastics in general. The particular system investigated by us has the advantage that by selective deuteration of the methyl groups, the neutron scattering measured is dominated by the incoherent contribution from the protons in the phenylene rings. In this way, the dynamics of such molecular groups can be experimentally isolated. Two different types of neutron spectrometers: time of flight and backscattering, were used in order to cover a wide dynamic range, which extends from microscopic (10(-13) s) to mesoscopic (10(-9) s) times. Moreover, neutron diffraction experiments with polarization analysis were also carried out in order to characterize the structural features of the sample investigated. Fast oscillations of increasing amplitude with temperature and pi-flips are identified for phenylene rings motions. Due to the structural disorder characteristic of the amorphous state, both molecular motions display a broad distribution of relaxation times, which spreads over several orders of magnitude. Based on the results obtained, we propose a model for phenylene rings dynamics, which combines the two kinds of molecular motions identified. This model nicely describes the neutron scattering results in the whole dynamic range investigated.
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Affiliation(s)
- S Arrese-Igor
- Departamento de Física de Materiales UPV/EHU, Apartado 1072, 20080 San Sebastián, Spain
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17
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Cang H, Li J, Novikov VN, Fayer MD. Dynamical signature of two “ideal glass transitions” in nematic liquid crystals. J Chem Phys 2003. [DOI: 10.1063/1.1618215] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
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18
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Cang H, Li J, Novikov VN, Fayer MD. Dynamics in supercooled liquids and in the isotropic phase of liquid crystals: A comparison. J Chem Phys 2003. [DOI: 10.1063/1.1568338] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
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19
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Cang H, Novikov VN, Fayer MD. Logarithmic decay of the orientational correlation function in supercooled liquids on the Ps to Ns time scale. J Chem Phys 2003. [DOI: 10.1063/1.1536612] [Citation(s) in RCA: 87] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
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20
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Brace DD, Gottke SD, Cang H, Fayer MD. Orientational dynamics of the glass forming liquid, dibutylphthalate: Time domain experiments and comparison to mode coupling theory. J Chem Phys 2002. [DOI: 10.1063/1.1427711] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
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Goldammer M, Losert C, Wuttke J, Petry W, Terki F, Schober H, Lunkenheimer P. Calcium rubidium nitrate: mode-coupling beta scaling without factorization. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2001; 64:021303. [PMID: 11497574 DOI: 10.1103/physreve.64.021303] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2001] [Indexed: 05/23/2023]
Abstract
The fast dynamics of viscous calcium rubidium nitrate is investigated by depolarized light scattering, neutron scattering, and dielectric loss. Fast beta relaxation evolves as in calcium potassium nitrate. The dynamic susceptibilities can be described by the asymptotic scaling law of mode-coupling theory with a shape parameter lambda=0.79; the temperature dependence of the amplitudes extrapolates to T(c) approximately equal 378 K. However, the frequencies of the minima of the three different spectroscopies never coincide, in conflict with the factorization prediction, indicating that the true asymptotic regime is unreachable.
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Affiliation(s)
- M Goldammer
- Physik-Department E13, Technische Universität München, 85747 Garching, Germany
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22
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Rinaldi A, Sciortino F, Tartaglia P. Dynamics in a supercooled molecular liquid: theory and simulations. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2001; 63:061210. [PMID: 11415083 DOI: 10.1103/physreve.63.061210] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2000] [Indexed: 05/23/2023]
Abstract
We report extensive simulations of liquid supercooled states for a simple three-site molecular model, introduced by Lewis and Wahnström [Phys. Rev. E 50, 3865 (1994)] to mimic the behavior of orthoterphenyl. The large system size and the long simulation length allow us to calculate very precisely (in a large q-vector range) self-correlation and collective correlation functions, providing a clean and simple reference model for theoretical descriptions of molecular liquids in supercooled states. The time and wave-vector dependence of the site-site correlation functions are compared (neglecting the molecular constraints) with detailed ideal mode-coupling theory predictions. Except for the wave-vector region where the dynamics are controlled by the center of mass (around 9 nm(-1)), the theoretical predictions compare very well with the simulation data.
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Affiliation(s)
- A Rinaldi
- Dipartimento di Fisica, Università di Roma La Sapienza, Piazzale Aldo Moro 2, I-00185, Roma, Italy
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23
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Kanaya T, Kaji K. Dynamics in the Glassy State and Near the Glass Transition of Amorphous Polymers as Studied by Neutron Scattering. POLYMER PHYSICS AND ENGINEERING 2001. [DOI: 10.1007/3-540-44484-x_2] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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24
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Gottke SD, Brace DD, Hinze G, Fayer MD. Time Domain Optical Studies of Dynamics in Supercooled o-Terphenyl: Comparison to Mode Coupling Theory on Fast and Slow Time Scales. J Phys Chem B 2000. [DOI: 10.1021/jp002949d] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- S. D. Gottke
- Department of Chemistry, Stanford University, Stanford, California 94305
| | - David D. Brace
- Department of Chemistry, Stanford University, Stanford, California 94305
| | - G. Hinze
- Department of Chemistry, Stanford University, Stanford, California 94305
| | - M. D. Fayer
- Department of Chemistry, Stanford University, Stanford, California 94305
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Wuttke J. Multiple-scattering effects on smooth neutron-scattering spectra. PHYSICAL REVIEW. E, STATISTICAL PHYSICS, PLASMAS, FLUIDS, AND RELATED INTERDISCIPLINARY TOPICS 2000; 62:6531-6539. [PMID: 11101990 DOI: 10.1103/physreve.62.6531] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2000] [Indexed: 05/23/2023]
Abstract
Elastic and inelastic incoherent neutron-scattering experiments are simulated for simple models: a rigid solid (as used for normalization), a glass (with a smooth distribution of harmonic vibrations), and a viscous liquid (described by schematic mode-coupling equations). In cases where the input scattering law factorizes into a wave-number-dependent amplitude and a frequency-dependent spectral distribution, the latter is only weakly affected by multiple scattering, whereas the former is severely distorted.
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Affiliation(s)
- J Wuttke
- Physik-Department E13, Technische Universitat Munchen, 85747 Garching, Germany
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26
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Hinze G, Brace DD, Gottke SD, Fayer MD. A detailed test of mode-coupling theory on all time scales: Time domain studies of structural relaxation in a supercooled liquid. J Chem Phys 2000. [DOI: 10.1063/1.1287595] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
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27
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Hinze G, Brace DD, Gottke SD, Fayer MD. Orientational dynamics in supercooled liquids near T(c) and comparison with ideal mode-coupling theory. PHYSICAL REVIEW LETTERS 2000; 84:2437-2440. [PMID: 11018904 DOI: 10.1103/physrevlett.84.2437] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/1999] [Indexed: 05/23/2023]
Abstract
Orientational dynamics in supercooled salol and ortho-terphenyl were measured near their critical temperatures, T(c), with optical Kerr effect experiments spanning a very broad range of times. Above T(c), the decays are shown to be in excellent agreement with the master curve predicted by ideal mode-coupling theory when higher order terms are included. Between the critical decay and the von Schweidler power laws, the intermediate time range of the data can be modeled by a power law. This intermediate power law, located at 2<t<10 ps to 500 ps (depending on temperature), shows a significant temperature dependence with a power law exponent of approximately -1 below T(c).
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Affiliation(s)
- G Hinze
- Department of Chemistry, Stanford University, Stanford, California 94305, USA
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Lindqvist A, Yamamuro O, Tsukushi I, Matsuo T. Excess heat capacities due to the low-energy excitations of molecular glasses: An approach using the soft potential model. J Chem Phys 1997. [DOI: 10.1063/1.474873] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Yamamuro O, Tsukushi I, Matsuo T, Takeda K, Kanaya T, Kaji K. Inelastic neutron scattering study of low-energy excitations in vapor-deposited glassy propylene. J Chem Phys 1997. [DOI: 10.1063/1.473045] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Wuttke J, Chang I, Randl OG, Fujara F, Petry W. Tagged-particle motion in viscous glycerol: Diffusion-relaxation crossover. PHYSICAL REVIEW. E, STATISTICAL PHYSICS, PLASMAS, FLUIDS, AND RELATED INTERDISCIPLINARY TOPICS 1996; 54:5364-5369. [PMID: 9965721 DOI: 10.1103/physreve.54.5364] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|
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Kanaya T, Kawaguchi T, Kaji K. Microscopic view of glass transition dynamics: A quasielastic neutron scattering study on trans‐1,4‐polychloroprene. J Chem Phys 1996. [DOI: 10.1063/1.472250] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Kartini E, Collins MF, Collier B, Mezei F, Svensson EC. Inelastic-neutron-scattering studies on glassy and liquid Ca0.4K0.6(NO3)1.4. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:6292-6300. [PMID: 9986645 DOI: 10.1103/physrevb.54.6292] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Yamamuro O, Matsuo T, Takeda K, Kanaya T, Kawaguchi T, Kaji K. Inelastic neutron scattering study of low energy excitations in glassy 1‐butene. J Chem Phys 1996. [DOI: 10.1063/1.471928] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
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Roland CM, Ngai KL. Response to ‘‘Comment on ‘Short time dynamics of glass‐forming liquids’ ’’ [J. Chem. Phys. 104, 8169 (1996)]. J Chem Phys 1996. [DOI: 10.1063/1.471528] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
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Wuttke J. Comment on ‘‘Short time dynamics of glass‐forming liquids’’ [J. Chem. Phys. 103, 1152 (1995)]. J Chem Phys 1996. [DOI: 10.1063/1.471494] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Dawidowski J, Bermejo FJ, Fayos R, Bennington SM, Criado A. Coherent neutron scattering response from glassy glycerol. PHYSICAL REVIEW. E, STATISTICAL PHYSICS, PLASMAS, FLUIDS, AND RELATED INTERDISCIPLINARY TOPICS 1996; 53:5079-5088. [PMID: 9964839 DOI: 10.1103/physreve.53.5079] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Meyer A, Wuttke J, Petry W, Peker A, Bormann R, Coddens G, Kranich L, Randl OG, Schober H. Harmonic behavior of metallic glasses up to the metastable melt. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:12107-12111. [PMID: 9982838 DOI: 10.1103/physrevb.53.12107] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Kanaya T, Kawaguchi T, Kaji K. Fast process of amorphous polystyrene below and above the glass transition temperature Tg as studied by quasielastic neutron scattering. J Chem Phys 1996. [DOI: 10.1063/1.471037] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Wuttke J, Petry W, Coddens G, Fujara F. Fast dynamics of glass-forming glycerol. PHYSICAL REVIEW. E, STATISTICAL PHYSICS, PLASMAS, FLUIDS, AND RELATED INTERDISCIPLINARY TOPICS 1995; 52:4026-4034. [PMID: 9963875 DOI: 10.1103/physreve.52.4026] [Citation(s) in RCA: 78] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Bartsch E, Fujara F, Legrand JF, Petry W, Sillescu H, Wuttke J. Dynamics in viscous orthoterphenyl: Results from coherent neutron scattering. PHYSICAL REVIEW. E, STATISTICAL PHYSICS, PLASMAS, FLUIDS, AND RELATED INTERDISCIPLINARY TOPICS 1995; 52:738-745. [PMID: 9963475 DOI: 10.1103/physreve.52.738] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Zorn R, Arbe A, Colmenero J, Frick B, Richter D, Buchenau U. Neutron scattering study of the picosecond dynamics of polybutadiene and polyisoprene. PHYSICAL REVIEW. E, STATISTICAL PHYSICS, PLASMAS, FLUIDS, AND RELATED INTERDISCIPLINARY TOPICS 1995; 52:781-795. [PMID: 9963480 DOI: 10.1103/physreve.52.781] [Citation(s) in RCA: 108] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Leyser H, Schulte A, Doster W, Petry W. High-pressure specific-heat spectroscopy at the glass transition in o-terphenyl. PHYSICAL REVIEW. E, STATISTICAL PHYSICS, PLASMAS, FLUIDS, AND RELATED INTERDISCIPLINARY TOPICS 1995; 51:5899-5904. [PMID: 9963328 DOI: 10.1103/physreve.51.5899] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Alba‐Simionesco C, Krauzman M. Low frequency Raman spectroscopy of supercooled fragile liquids analyzed with schematic mode coupling models. J Chem Phys 1995. [DOI: 10.1063/1.469373] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Li G, King HE, Oliver WF, Herbst CA, Cummins HZ. Pressure and temperature dependence of glass-transition dynamics in a "fragile" glass former. PHYSICAL REVIEW LETTERS 1995; 74:2280-2283. [PMID: 10057888 DOI: 10.1103/physrevlett.74.2280] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Buchenau U, Schönfeld C, Richter D, Kanaya T, Kaji K, Wehrmann R. Neutron scattering study of the vibration-relaxation crossover in amorphous polycarbonates. PHYSICAL REVIEW LETTERS 1994; 73:2344-2347. [PMID: 10057036 DOI: 10.1103/physrevlett.73.2344] [Citation(s) in RCA: 49] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Wuttke J, Hernandez J, Li G, Coddens G, Cummins HZ, Fujara F, Petry W, Sillescu H. Neutron and light scattering study of supercooled glycerol. PHYSICAL REVIEW LETTERS 1994; 72:3052-3055. [PMID: 10056055 DOI: 10.1103/physrevlett.72.3052] [Citation(s) in RCA: 80] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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