251
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Powell CT, Paeng K, Chen Z, Richert R, Yu L, Ediger MD. Fast Crystal Growth from Organic Glasses: Comparison of o-Terphenyl with its Structural Analogs. J Phys Chem B 2014; 118:8203-9. [DOI: 10.1021/jp501301y] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- C. Travis Powell
- Department
of Chemistry, University of Wisconsin—Madison, Madison, Wisconsin 53706, United States
- School
of Pharmacy, University of Wisconsin—Madison, Madison, Wisconsin 53705, United States
| | - Keewook Paeng
- Department
of Chemistry, University of Wisconsin—Madison, Madison, Wisconsin 53706, United States
| | - Zhen Chen
- Department
of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287, United States
| | - Ranko Richert
- Department
of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287, United States
| | - Lian Yu
- Department
of Chemistry, University of Wisconsin—Madison, Madison, Wisconsin 53706, United States
- School
of Pharmacy, University of Wisconsin—Madison, Madison, Wisconsin 53705, United States
| | - M. D. Ediger
- Department
of Chemistry, University of Wisconsin—Madison, Madison, Wisconsin 53706, United States
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252
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Helfferich J, Ziebert F, Frey S, Meyer H, Farago J, Blumen A, Baschnagel J. Continuous-time random-walk approach to supercooled liquids. I. Different definitions of particle jumps and their consequences. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2014; 89:042603. [PMID: 24827270 DOI: 10.1103/physreve.89.042603] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2013] [Indexed: 06/03/2023]
Abstract
Single-particle trajectories in supercooled liquids display long periods of localization interrupted by "fast moves." This observation suggests a modeling by a continuous-time random walk (CTRW). We perform molecular dynamics simulations of equilibrated short-chain polymer melts near the critical temperature of mode-coupling theory Tc and extract "moves" from the monomer trajectories. We show that not all moves comply with the conditions of a CTRW. Strong forward-backward correlations are found in the supercooled state. A refinement procedure is suggested to exclude these moves from the analysis. We discuss the repercussions of the refinement on the jump-length and waiting-time distributions as well as on characteristic time scales, such as the average waiting time ("exchange time") and the average time for the first move ("persistence time"). The refinement modifies the temperature (T) dependence of these time scales. For instance, the average waiting time changes from an Arrhenius-type to a Vogel-Fulcher-type T dependence. We discuss this observation in the context of the bifurcation of the α process and (Johari) β process found in many glass-forming materials to occur near Tc. Our analysis lays the foundation for a study of the jump-length and waiting-time distributions, their temperature and chain-length dependencies, and the modeling of the monomer dynamics by a CTRW approach in the companion paper [J. Helfferich et al., Phys. Rev. E 89, 042604 (2014)].
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Affiliation(s)
- J Helfferich
- Physikalisches Institut, Albert-Ludwigs-Universität, Hermann-Herder-Str. 3, 79104 Freiburg, Germany
| | - F Ziebert
- Physikalisches Institut, Albert-Ludwigs-Universität, Hermann-Herder-Str. 3, 79104 Freiburg, Germany and Institut Charles Sadron, Université de Strasbourg, CNRS UPR22, 23 rue du Loess, 67034 Strasbourg Cedex 2, France
| | - S Frey
- Institut Charles Sadron, Université de Strasbourg, CNRS UPR22, 23 rue du Loess, 67034 Strasbourg Cedex 2, France
| | - H Meyer
- Institut Charles Sadron, Université de Strasbourg, CNRS UPR22, 23 rue du Loess, 67034 Strasbourg Cedex 2, France
| | - J Farago
- Institut Charles Sadron, Université de Strasbourg, CNRS UPR22, 23 rue du Loess, 67034 Strasbourg Cedex 2, France
| | - A Blumen
- Physikalisches Institut, Albert-Ludwigs-Universität, Hermann-Herder-Str. 3, 79104 Freiburg, Germany
| | - J Baschnagel
- Institut Charles Sadron, Université de Strasbourg, CNRS UPR22, 23 rue du Loess, 67034 Strasbourg Cedex 2, France
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253
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Chai Y, Salez T, McGraw JD, Benzaquen M, Dalnoki-Veress K, Raphael E, Forrest JA. A Direct Quantitative Measure of Surface Mobility in a Glassy Polymer. Science 2014; 343:994-9. [DOI: 10.1126/science.1244845] [Citation(s) in RCA: 174] [Impact Index Per Article: 17.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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254
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Wang L, Xu N. Probing the glass transition from structural and vibrational properties of zero-temperature glasses. PHYSICAL REVIEW LETTERS 2014; 112:055701. [PMID: 24580613 DOI: 10.1103/physrevlett.112.055701] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2013] [Indexed: 06/03/2023]
Abstract
We find that the density dependence of the glass transition temperature of Lennard-Jones (LJ) and Weeks-Chandler-Andersen (WCA) systems can be predicted from properties of the zero-temperature (T=0) glasses. Below a crossover density ρs, LJ and WCA glasses show different structures, leading to different vibrational properties and consequently making LJ glasses more stable with higher glass transition temperatures than WCA ones. Above ρs, structural and vibrational quantities of the T=0 glasses show scaling collapse. From scaling relations and dimensional analysis, we predict a density scaling of the glass transition temperature, in excellent agreement with simulation results. We also propose an empirical expression of the glass transition temperature using structural and vibrational properties of the T=0 glasses, which works well over a wide range of densities.
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Affiliation(s)
- Lijin Wang
- CAS Key Laboratory of Soft Matter Chemistry, Hefei National Laboratory for Physical Sciences at the Microscale and Department of Physics, University of Science and Technology of China, Hefei 230026, People's Republic of China
| | - Ning Xu
- CAS Key Laboratory of Soft Matter Chemistry, Hefei National Laboratory for Physical Sciences at the Microscale and Department of Physics, University of Science and Technology of China, Hefei 230026, People's Republic of China
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255
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Kahlau R, Bock D, Schmidtke B, Rössler EA. Dynamics of asymmetric binary glass formers. I. A dielectric and nuclear magnetic resonance spectroscopy study. J Chem Phys 2014; 140:044509. [DOI: 10.1063/1.4861428] [Citation(s) in RCA: 22] [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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256
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Tu W, Chen Z, Gao Y, Li Z, Zhang Y, Liu R, Tian Y, Wang LM. Glass transition and mixing thermodynamics of a binary eutectic system. Phys Chem Chem Phys 2014; 16:3586-92. [DOI: 10.1039/c3cp52868e] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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257
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Ishii K, Nakayama H. Structural relaxation of vapor-deposited molecular glasses and supercooled liquids. Phys Chem Chem Phys 2014; 16:12073-92. [DOI: 10.1039/c4cp00458b] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The properties of vapor-deposited molecular glasses largely depend on deposition conditions, and stable and/or dense glasses are formed with several compounds.
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Affiliation(s)
- Kikujiro Ishii
- Department of Chemistry
- Gakushuin University
- Tokyo 171-8588, Japan
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258
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Khouri J, Johari GP. Note: Effects of adding a viscosity-increasing 2 nm-size molecule on dielectric relaxation features and the dynamic heterogeneity view. J Chem Phys 2013; 138:196101. [PMID: 23697443 DOI: 10.1063/1.4807006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
To investigate the extent to which dynamic heterogeneity determines the relaxation features, we studied the effect of adding a viscosity-increasing, ∼2 nm size polyhederal oligomeric silsesquioxane (POSS) molecule on dielectric relaxation. Addition of POSS increased the relaxation time of the α-process, τ(m,α), and decreased the non-exponential response parameter, β, which is compatible with the dynamic heterogeneity view. But β varied monotonically with the composition, and there was little variation of β with the temperature, which seems incompatible with that view. Effects of adding nm-size particles in simulations may reveal how the size of dynamically heterogeneous regions affects τ(m,α) and β.
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Affiliation(s)
- Joseph Khouri
- Department of Materials Science and Engineering, McMaster University, Hamilton, Ontario L8S 4L7, Canada
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259
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Rodrigues AC, Viciosa MT, Danède F, Affouard F, Correia NT. Molecular Mobility of Amorphous S-Flurbiprofen: A Dielectric Relaxation Spectroscopy Approach. Mol Pharm 2013; 11:112-30. [DOI: 10.1021/mp4002188] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- A. C. Rodrigues
- REQUIMTE/CQFB, Departamento de Química, Faculdade
de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
| | - M. T. Viciosa
- CQFM − Centro
de Química-Física Molecular and IN − Institute
of Nanoscience and Nanotechnology, Instituto Superior Técnico, Universidade de Lisboa, Avenida Rovisco Pais, 1049-001 Lisboa, Portugal
| | - F. Danède
- Unité Matériaux et Transformation (UMET), UMR CNRS
8207, UFR de Physique, BAT P5, Université Lille 1, 59655 Villeneuve d’Ascq, France
| | - F. Affouard
- Unité Matériaux et Transformation (UMET), UMR CNRS
8207, UFR de Physique, BAT P5, Université Lille 1, 59655 Villeneuve d’Ascq, France
| | - N. T. Correia
- REQUIMTE/CQFB, Departamento de Química, Faculdade
de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
- Unité Matériaux et Transformation (UMET), UMR CNRS
8207, UFR de Physique, BAT P5, Université Lille 1, 59655 Villeneuve d’Ascq, France
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260
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Bernini S, Puosi F, Barucco M, Leporini D. Competition of the connectivity with the local and the global order in polymer melts and crystals. J Chem Phys 2013; 139:184501. [DOI: 10.1063/1.4828725] [Citation(s) in RCA: 11] [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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261
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Yu HB, Luo Y, Samwer K. Ultrastable metallic glass. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2013; 25:5904-5908. [PMID: 23956053 DOI: 10.1002/adma.201302700] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2013] [Indexed: 06/02/2023]
Abstract
A new metallic glass, which was created by vapour deposition at an appropriately high substrate temperature, shows exceptional thermal stability, and enhanced glass transition temperature and elastic modulus. Comparing this new material with other organic glasses prepared by similar routes and known as ultrastable glasses demonstrates the formation of ultrastable glassy materials correlates to the important concept of fragility.
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Affiliation(s)
- Hai-Bin Yu
- I. Physikalisches Institut, Universität Göttingen, Göttingen, 37077, Germany
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262
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Gao Y, Tu W, Chen Z, Tian Y, Liu R, Wang LM. Dielectric relaxation of long-chain glass-forming monohydroxy alcohols. J Chem Phys 2013; 139:164504. [DOI: 10.1063/1.4825398] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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263
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Kang H, Kirkpatrick TR, Thirumalai D. Manifestation of random first-order transition theory in Wigner glasses. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2013; 88:042308. [PMID: 24229173 DOI: 10.1103/physreve.88.042308] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2012] [Revised: 07/21/2013] [Indexed: 06/02/2023]
Abstract
We use Brownian dynamics simulations of a binary mixture of highly charged spherical colloidal particles to test some of the predictions of the random first-order transition (RFOT) theory [Phys. Rev. Lett. 58, 2091 (1987); Phys. Rev. A 40, 1045 (1989)]. In accord with mode-coupling theory and RFOT, we find that as the volume fraction of the colloidal particles ϕ approaches the dynamical transition value ϕ(A), three measures of dynamics show an effective ergodic to nonergodic transition. First, there is a dramatic slowing down of diffusion, with the translational diffusion constant decaying as a power law as ϕ→ϕ(A)(-). Second, the energy metric, a measure of ergodicity breaking in classical many-body systems, shows that the system becomes effectively nonergodic as ϕ(A) is approached. Finally, the time t(*), at which the four-point dynamical susceptibility achieves a maximum, also increases as a power law near ϕ(A). Remarkably, the translational diffusion coefficients, ergodic diffusion coefficient, and (t(*))(-) all vanish as (ϕ(-1)-ϕ(A)(-1))(γ) with both ϕ(A)(≈0.1) and γ being the roughly the same for all three quantities. Above ϕ(A), transport involves crossing free energy barriers. In this regime, the density-density correlation function decays as a stretched exponential [exp-(t/τ(α))(β)] with β≈0.45. The ϕ dependence of the relaxation time τ(α) could be fit using the Vogel-Tamman-Fulcher law with the ideal glass transition at ϕ(K)≈0.47. By using a local entropy measure, we show that the law of large numbers is not obeyed above ϕ(A), and gives rise to subsample to subsample fluctuations in all physical observables. We propose that dynamical heterogeneity is a consequence of violation of law of large numbers.
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Affiliation(s)
- Hongsuk Kang
- Institute for Physical Science and Technology, University of Maryland, College Park, Maryland 20742, USA
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264
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Lam CH, Tsui OKC. Crossover to surface flow in supercooled unentangled polymer films. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2013; 88:042604. [PMID: 24229203 DOI: 10.1103/physreve.88.042604] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2013] [Indexed: 06/02/2023]
Abstract
We study the driven flow of an unentangled glassy polymer film with a free upper surface and supported below by a substrate using nonequilibrium molecular dynamics simulations based on a bead-spring model. Above the glass transition temperature T(g), simple Poiseuille laminar flow is observed with the film mobility defined as the flow current density per unit pressure gradient scaling as h(3) with the film thickness h. Below T(g), the film mobility becomes independent of h, signifying surface transport. This is in full agreement with recent experiments on the time evolution of capillary waves in polystyrene films supported by silica. A mobile layer is found responsible for the surface transport, as previously conjectured. Our result also shows that it has a velocity profile decaying exponentially into the bulk.
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Affiliation(s)
- Chi-Hang Lam
- Department of Applied Physics, Hong Kong Polytechnic University, Hung Hom, Hong Kong, China
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265
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Schmidtke B, Petzold N, Kahlau R, Rössler EA. Reorientational dynamics in molecular liquids as revealed by dynamic light scattering: From boiling point to glass transition temperature. J Chem Phys 2013; 139:084504. [DOI: 10.1063/1.4817406] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
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266
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Dalal SS, Fakhraai Z, Ediger MD. High-Throughput Ellipsometric Characterization of Vapor-Deposited Indomethacin Glasses. J Phys Chem B 2013; 117:15415-25. [DOI: 10.1021/jp405005n] [Citation(s) in RCA: 87] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Shakeel S. Dalal
- Department of Chemistry, University of Wisconsin—Madison, Madison, Wisconsin
53706, United States
| | - Zahra Fakhraai
- Department
of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania
19104, United States
| | - M. D. Ediger
- Department of Chemistry, University of Wisconsin—Madison, Madison, Wisconsin
53706, United States
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267
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Chemical influence on β-relaxations and the formation of molecule-like metallic glasses. Nat Commun 2013; 4:2204. [DOI: 10.1038/ncomms3204] [Citation(s) in RCA: 109] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2013] [Accepted: 06/26/2013] [Indexed: 11/08/2022] Open
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268
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Ngai KL, Roland CM. Note: Thermorheological complexity in polymers and the problem of the glass transition. J Chem Phys 2013; 139:036101. [DOI: 10.1063/1.4813322] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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269
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Hirata A, Kang LJ, Fujita T, Klumov B, Matsue K, Kotani M, Yavari AR, Chen MW. Geometric Frustration of Icosahedron in Metallic Glasses. Science 2013; 341:376-9. [DOI: 10.1126/science.1232450] [Citation(s) in RCA: 315] [Impact Index Per Article: 28.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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270
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Eastwood MP, Chitra T, Jumper JM, Palmo K, Pan AC, Shaw DE. Rotational Relaxation in ortho-Terphenyl: Using Atomistic Simulations to Bridge Theory and Experiment. J Phys Chem B 2013; 117:12898-907. [DOI: 10.1021/jp402102w] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
| | - Tarun Chitra
- D. E. Shaw Research, New York, New York 10036, United States
| | - John M. Jumper
- D. E. Shaw Research, New York, New York 10036, United States
| | - Kim Palmo
- D. E. Shaw Research, New York, New York 10036, United States
| | - Albert C. Pan
- D. E. Shaw Research, New York, New York 10036, United States
| | - David E. Shaw
- D. E. Shaw Research, New York, New York 10036, United States
- Center for Computational Biology
and Bioinformatics, Columbia University, New York, New York 10032, United States
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271
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May RA, Smith RS, Kay BD. Mobility of Supercooled Liquid Toluene, Ethylbenzene, and Benzene near Their Glass Transition Temperatures Investigated Using Inert Gas Permeation. J Phys Chem A 2013; 117:11881-9. [DOI: 10.1021/jp403093e] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- R. Alan May
- Fundamental and Computational
Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington
99352, United States
| | - R. Scott Smith
- Fundamental and Computational
Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington
99352, United States
| | - Bruce D. Kay
- Fundamental and Computational
Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington
99352, United States
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272
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Xu WS, Freed KF. Thermodynamic scaling of dynamics in polymer melts: Predictions from the generalized entropy theory. J Chem Phys 2013; 138:234501. [DOI: 10.1063/1.4809991] [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
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273
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Whitaker KR, Scifo DJ, Ediger MD, Ahrenberg M, Schick C. Highly Stable Glasses of cis-Decalin and cis/trans-Decalin Mixtures. J Phys Chem B 2013; 117:12724-33. [DOI: 10.1021/jp400960g] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Katherine R. Whitaker
- Department
of Chemistry, University of Wisconsin—Madison, Madison, Wisconsin
53706, United States
| | - Daniel J. Scifo
- Department
of Chemistry, University of Wisconsin—Madison, Madison, Wisconsin
53706, United States
| | - M. D. Ediger
- Department
of Chemistry, University of Wisconsin—Madison, Madison, Wisconsin
53706, United States
| | | | - Christoph Schick
- Institute
of Physics, University of Rostock, Rostock
18051, Germany
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274
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Loubeyre L, Ahart M, Gramsch SA, Hemley RJ. Density dependence of dynamical heterogeneity in fluid methanol. J Chem Phys 2013; 138:174507. [PMID: 23656144 DOI: 10.1063/1.4802024] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Brillouin and Raman scattering experiments on methanol through its glass transition under pressure are reported. The Brillouin scattering data were analyzed using viscoelastic theory and a fit to the Vinet equation of state. The variation in the linewidth of the longitudinal acoustic mode with pressure shows a broad maximum centered around 3 GPa. The pressure evolution of the relaxation time in the GHz range is obtained, and the Raman data are analyzed in terms of the Boson peak and its associated relaxation time in the THz range. The pressure evolution of these two relaxation processes extends previous determinations of relaxations at lower frequency based on dielectric measurements in supercooled methanol. The relaxation processes in glass-forming methanol have now been investigated over a wide frequency range and their evolution followed over a large variation of density.
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Affiliation(s)
- Louis Loubeyre
- IUT Paris Jussieu, Université Paris Diderot, 75205, Paris, France
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275
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Priezjev NV. Heterogeneous relaxation dynamics in amorphous materials under cyclic loading. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2013; 87:052302. [PMID: 23767535 DOI: 10.1103/physreve.87.052302] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2013] [Indexed: 06/02/2023]
Abstract
Molecular dynamics simulations are performed to investigate heterogeneous dynamics in amorphous glassy materials under oscillatory shear strain. We consider three-dimensional binary Lennard-Jones mixture well below the glass transition temperature. The structural relaxation and dynamical heterogeneity are quantified by means of the self-overlap order parameter and the dynamic susceptibility. We found that at sufficiently small strain amplitudes, the mean square displacement exhibits a broad subdiffusive plateau and the system undergoes nearly reversible deformation over about 10(4) cycles. Upon increasing strain amplitude, the transition to the diffusive regime occurs at shorter time intervals and the relaxation process involves intermittent bursts of large particle displacements. The detailed analysis of particle hopping dynamics and the dynamic susceptibility indicates that mobile particles aggregate into clusters whose sizes increase at larger strain amplitudes. Finally, the correlation between particle mobilities in consecutive time intervals demonstrates that dynamic facilitation becomes increasingly pronounced at larger strain amplitudes.
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Affiliation(s)
- Nikolai V Priezjev
- Department of Mechanical Engineering, Michigan State University, East Lansing, Michigan 48824, USA
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276
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Puosi F, De Michele C, Leporini D. Scaling between relaxation, transport and caged dynamics in a binary mixture on a per-component basis. J Chem Phys 2013; 138:12A532. [DOI: 10.1063/1.4789943] [Citation(s) in RCA: 25] [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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277
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Johari GP, Khouri J. Non-exponential nature of calorimetric and other relaxations: Effects of 2 nm-size solutes, loss of translational diffusion, isomer specificity, and sample size. J Chem Phys 2013; 138:12A511. [DOI: 10.1063/1.4770056] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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278
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Petzold N, Schmidtke B, Kahlau R, Bock D, Meier R, Micko B, Kruk D, Rössler EA. Evolution of the dynamic susceptibility in molecular glass formers: Results from light scattering, dielectric spectroscopy, and NMR. J Chem Phys 2013; 138:12A510. [DOI: 10.1063/1.4770055] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
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279
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Kim K, Saito S. Multiple length and time scales of dynamic heterogeneities in model glass-forming liquids: A systematic analysis of multi-point and multi-time correlations. J Chem Phys 2013; 138:12A506. [DOI: 10.1063/1.4769256] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
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280
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Friedrichs C, Emmerling S, Kircher G, Graf R, Wolfgang Spiess H. Glass transition of poly(ethylmethacrylate) admixed and bound to nanoparticles. J Chem Phys 2013; 138:12A503. [DOI: 10.1063/1.4769252] [Citation(s) in RCA: 11] [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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281
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Hansen JS, Lemarchand CA, Nielsen E, Dyre JC, Schrøder T. Four-component united-atom model of bitumen. J Chem Phys 2013; 138:094508. [DOI: 10.1063/1.4792045] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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282
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Ngai KL, Capaccioli S. An explanation of the differences in diffusivity of the components of the metallic glass Pd43Cu27Ni10P20. J Chem Phys 2013; 138:094504. [PMID: 23485310 DOI: 10.1063/1.4793597] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Bartsch et al. [Phys. Rev. Lett. 104, 195901 (2010)] reported measurements of the diffusivities of different components of the multi-component bulk metallic glass Pd43Cu27Ni10P20. The diffusion of the largest Pd and the smallest P was found to be drastically different. The Stokes-Einstein relation breaks down when considering the P constituent atom, while the relation is obeyed by the Pd atom over 14 orders of magnitude of change in Pd diffusivity. This difference in behavior of Pd and P poses a problem challenging for explanation. With the assist of a recent finding in metallic glasses that the β-relaxation and the diffusion of the smallest component are closely related processes by Yu et al. [Phys. Rev. Lett. 109, 095508 (2012)], we use the Coupling Model to explain the observed difference between P and Pd quantitatively. The same model also explains the correlation between property of the β-relaxation with fragility found in the family of (CexLa1-x)68Al10Cu20Co2 with 0 ≤ x ≤ 1.
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Affiliation(s)
- K L Ngai
- Dipartimento di Fisica, Università di Pisa, Largo B. Pontecorvo 3, I-56127 Pisa, Italy.
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283
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Schroer CFE, Heuer A. Anomalous diffusion of driven particles in supercooled liquids. PHYSICAL REVIEW LETTERS 2013; 110:067801. [PMID: 23432309 DOI: 10.1103/physrevlett.110.067801] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2012] [Indexed: 06/01/2023]
Abstract
We perform nonequilibrium dynamics simulations of a binary Lennard-Jones mixture in which an external force is applied on a single tagged particle. For the diffusive properties of this particle parallel to the force, superdiffusive behavior at intermediate times as well as giant long-time diffusivity is observed. A quantitative description of this nontrivial behavior is given by a continuous time random walk analysis of the system in configuration space. We further demonstrate that the same physical properties which are responsible for the superdiffusivity in nonequilibrium systems also determine the non-Gaussian parameter in equilibrium systems.
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Affiliation(s)
- Carsten F E Schroer
- Institut für physikalische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstrasse 28/30, 48149 Münster, Germany.
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Yuan H, Khatua S, Zijlstra P, Orrit M. Individual gold nanorods report on dynamical heterogeneity in supercooled glycerol. Faraday Discuss 2013; 167:515-27. [DOI: 10.1039/c3fd00091e] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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285
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Chung YG, Lacks DJ. Atomic Mobility in a Polymer Glass after Shear and Thermal Cycles. J Phys Chem B 2012; 116:14201-5. [DOI: 10.1021/jp309772f] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yongchul G. Chung
- Department of Chemical Engineering, Case Western Reserve University, Cleveland, Ohio 44106, United
States
| | - Daniel J. Lacks
- Department of Chemical Engineering, Case Western Reserve University, Cleveland, Ohio 44106, United
States
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