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Yu Y, Yang C, Baggioli M, Phillips AE, Zaccone A, Zhang L, Kajimoto R, Nakamura M, Yu D, Hong L. The ω 3 scaling of the vibrational density of states in quasi-2D nanoconfined solids. Nat Commun 2022; 13:3649. [PMID: 35752735 PMCID: PMC9233700 DOI: 10.1038/s41467-022-31349-6] [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: 09/22/2021] [Accepted: 06/14/2022] [Indexed: 11/25/2022] Open
Abstract
The vibrational properties of crystalline bulk materials are well described by Debye theory, which successfully predicts the quadratic ω2 low-frequency scaling of the vibrational density of states. However, the analogous framework for nanoconfined materials with fewer degrees of freedom has been far less well explored. Using inelastic neutron scattering, we characterize the vibrational density of states of amorphous ice confined inside graphene oxide membranes and we observe a crossover from the Debye ω2 scaling to an anomalous ω3 behaviour upon reducing the confinement size L. Additionally, using molecular dynamics simulations, we confirm the experimental findings and prove that such a scaling appears in both crystalline and amorphous solids under slab-confinement. We theoretically demonstrate that this low-frequency ω3 law results from the geometric constraints on the momentum phase space induced by confinement along one spatial direction. Finally, we predict that the Debye scaling reappears at a characteristic frequency ω× = vL/2π, with v the speed of sound of the material, and we confirm this quantitative estimate with simulations. A description of the vibrational properties of amorphous ice confined in graphene oxide membranes, as an exemplary nanoconfined material, is presented. Inelastic neutron scattering experiments and molecular dynamics simulations show anomalous deviations from standard bulk behavior.
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Affiliation(s)
- Yuanxi Yu
- School of Physics and Astronomy, Shanghai Jiao Tong University, 200240, Shanghai, China.,Institute of Natural Sciences, Shanghai Jiao Tong University, 200240, Shanghai, China
| | - Chenxing Yang
- School of Physics and Astronomy, Shanghai Jiao Tong University, 200240, Shanghai, China.,Institute of Natural Sciences, Shanghai Jiao Tong University, 200240, Shanghai, China
| | - Matteo Baggioli
- Wilczek Quantum Center, School of Physics and Astronomy, Shanghai Jiao Tong University, 200240, Shanghai, China. .,Shanghai Research Center for Quantum Sciences, 201315, Shanghai, China.
| | - Anthony E Phillips
- School of Physics and Astronomy, Queen Mary University of London, London, UK
| | - Alessio Zaccone
- Department of Physics "A. Pontremoli", University of Milan, via Celoria 16, 20133, Milan, Italy.,Cavendish Laboratory, University of Cambridge, CB3 0HE, Cambridge, UK
| | - Lei Zhang
- Institute of Natural Sciences, Shanghai Jiao Tong University, 200240, Shanghai, China.,School of Materials Science and Engineering, Shanghai Jiao Tong University, 200240, Shanghai, China
| | - Ryoichi Kajimoto
- J-PARC Center, Japan Atomic Energy Agency (JAEA), Tokai, Ibaraki, 319-1195, Japan
| | - Mitsutaka Nakamura
- J-PARC Center, Japan Atomic Energy Agency (JAEA), Tokai, Ibaraki, 319-1195, Japan
| | - Dehong Yu
- Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW, 2234, Australia
| | - Liang Hong
- School of Physics and Astronomy, Shanghai Jiao Tong University, 200240, Shanghai, China. .,Institute of Natural Sciences, Shanghai Jiao Tong University, 200240, Shanghai, China. .,Shanghai National Center for Applied Mathematics (SJTU Center), Shanghai Jiao Tong University, 200240, Shanghai, China. .,Shanghai Artificial Intelligence Laboratory, 200232, Shanghai, China. .,School of Medicine, Shanghai Jiao Tong University, 200240, Shanghai, China. .,Zhangjiang Institute for Advanced Study, Shanghai Jiao Tong University, 200240, Shanghai, China.
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Salez T, Salez J, Dalnoki-Veress K, Raphaël E, Forrest JA. Cooperative strings and glassy interfaces. Proc Natl Acad Sci U S A 2015; 112:8227-31. [PMID: 26100908 PMCID: PMC4500214 DOI: 10.1073/pnas.1503133112] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
We introduce a minimal theory of glass formation based on the ideas of molecular crowding and resultant string-like cooperative rearrangement, and address the effects of free interfaces. In the bulk case, we obtain a scaling expression for the number of particles taking part in cooperative strings, and we recover the Adam-Gibbs description of glassy dynamics. Then, by including thermal dilatation, the Vogel-Fulcher-Tammann relation is derived. Moreover, the random and string-like characters of the cooperative rearrangement allow us to predict a temperature-dependent expression for the cooperative length ξ of bulk relaxation. Finally, we explore the influence of sample boundaries when the system size becomes comparable to ξ. The theory is in agreement with measurements of the glass-transition temperature of thin polymer films, and allows quantification of the temperature-dependent thickness hm of the interfacial mobile layer.
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Affiliation(s)
- Thomas Salez
- Perimeter Institute for Theoretical Physics, Waterloo, ON, Canada N2L 2Y5; Laboratoire de Physico-Chimie Théorique, UMR CNRS Gulliver 7083, ESPCI ParisTech, PSL Research University, 75005 Paris, France;
| | - Justin Salez
- Laboratoire de Probabilités et Modèles Aléatoires, Université Paris Diderot, 75013 Paris, France
| | - Kari Dalnoki-Veress
- Laboratoire de Physico-Chimie Théorique, UMR CNRS Gulliver 7083, ESPCI ParisTech, PSL Research University, 75005 Paris, France; Department of Physics and Astronomy, McMaster University, Hamilton, ON, Canada L8S 4M1
| | - Elie Raphaël
- Laboratoire de Physico-Chimie Théorique, UMR CNRS Gulliver 7083, ESPCI ParisTech, PSL Research University, 75005 Paris, France
| | - James A Forrest
- Perimeter Institute for Theoretical Physics, Waterloo, ON, Canada N2L 2Y5; Department of Physics & Astronomy, University of Waterloo, Waterloo, ON, Canada N2L 3G1
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Gallo P, Rovere M. Lennard-Jones binary mixture in disordered matrices: exploring the mode coupling scenario at increasing confinement. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2011; 23:234118. [PMID: 21613712 DOI: 10.1088/0953-8984/23/23/234118] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We present results of molecular dynamics simulations performed on a Lennard-Jones liquid binary mixture confined in matrices of soft spheres at increasing packing fraction. We study the dynamical properties of the liquid at a given density upon supercooling. Our aim is to test the validity of the mode coupling theory in predicting the behaviour of the glass forming liquid when it is under confinement in a disordered matrix. We use two different methods to build up the confining environment. We focus in particular on the behaviour of the single particle density correlators. We find a close agreement with the mode coupling theory at least for all the range of packing fractions examined. Discrepancies between the theory and the computer simulation results can be attributed to hopping effects which are more important at increasing confinement.
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Affiliation(s)
- P Gallo
- Dipartimento di Fisica, Università Roma Tre, Via della Vasca Navale 84, I-00146 Roma, Italy.
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Chumakov AI, Sergueev I, van Bürck U, Schirmacher W, Asthalter T, Rüffer R, Leupold O, Petry W. Collective nature of the boson peak and universal transboson dynamics of glasses. PHYSICAL REVIEW LETTERS 2004; 92:245508. [PMID: 15245100 DOI: 10.1103/physrevlett.92.245508] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2003] [Indexed: 05/24/2023]
Abstract
Using probe molecules with resonant nuclei and nuclear inelastic scattering, we are able to measure the density of states exclusively for collective motions with a correlation length of more than approximately 20 A. Such spectra exhibit an excess of low-energy modes (boson peak). This peak behaves in the same way as that observed by conventional methods. This shows that a significant part of the modes constituting the boson peak is of collective character. At energies above the boson peak, the reduced density of states of the collective motions universally exhibits an exponential decrease.
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Affiliation(s)
- A I Chumakov
- European Synchrotron Radiation Facility, P.O. Box 220, F-38043 Grenoble, France
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Frick B, Dalnoki-Veress K, Forrest JA, Dutcher J, Murray C, Higgins A. First inelastic neutron scattering studies on thin free standing polymer films. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2003; 12 Suppl 1:S93-S96. [PMID: 15011024 DOI: 10.1140/epjed/e2003-01-022-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/01/2003] [Indexed: 05/24/2023]
Abstract
Glass transition studies in free standing polymer films have revealed values of the transition temperature, T(g), which were substantially reduced below the bulk for sufficiently thin films. Here we report on the preparation of two stacks of free standing polystyrene films: 70 films with a thickness of h approximately 107 nm and 140 films with h approximately 55 nm with equivalent total sample thicknesses of approximately 7.5 microm. We have performed the first measurements on such samples using inelastic neutron scattering, and demonstrate that inelastic neutron scattering experiments, performed on the time-of-flight spectrometer IN6 and the backscattering spectrometer IN16 at the Institut Laue-Langevin, are feasible.
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Affiliation(s)
- B Frick
- Institut Laue-Langevin, 6 rue Jules Horowitz, 38042 Grenoble, France
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Soles CL, Douglas JF, Wu WL, Dimeo RM. Incoherent neutron scattering and the dynamics of confined polycarbonate films. PHYSICAL REVIEW LETTERS 2002; 88:037401. [PMID: 11801085 DOI: 10.1103/physrevlett.88.037401] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2001] [Indexed: 05/23/2023]
Abstract
Incoherent elastic neutron scattering measurements are performed on thin (75 to 1015 A) polycarbonate films supported on Si wafers. We find that the mean-square atomic displacement <u(2)> is diminished by thin film confinement. For film thicknesses comparable to the unperturbed dimensions of the macromolecule, we observe two characteristic crossover temperatures in <u(2)> as a function of temperature T, one above and the other below the bulk T(g). Furthermore, the harmonic force constant kappa, defined by the low temperature dependence of <u(2)> (i.e., kappa approximately k(B)T/<u(2)>), increases as the film thickness decreases. These observations suggest that the atoms are more strongly localized in the thin supported films.
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Affiliation(s)
- C L Soles
- NIST Polymers Division, Gaithersburg, Maryland 20899-8541, USA
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