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Grammes T, de Ligny D, Scheffler F, Nizamutdinova A, van Wüllen L, Kamitsos EI, Massera J, Brauer DS. Influence of Phosphate on Network Connectivity and Glass Transition in Highly Polymerized Aluminosilicate Glasses. J Phys Chem B 2022; 126:9911-9926. [DOI: 10.1021/acs.jpcb.2c06530] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Thilo Grammes
- Otto Schott Institute of Materials Research, Friedrich Schiller University Jena, Fraunhoferstr. 6, 07743Jena, Germany
| | - Dominique de Ligny
- Institute of Glass and Ceramics, Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Martensstr. 5, 91058Erlangen, Germany
| | - Franziska Scheffler
- Otto Schott Institute of Materials Research, Friedrich Schiller University Jena, Fraunhoferstr. 6, 07743Jena, Germany
| | - Alina Nizamutdinova
- Institute of Physics, Augsburg University, Universitätsstr. 1, 86159Augsburg, Germany
| | - Leo van Wüllen
- Institute of Physics, Augsburg University, Universitätsstr. 1, 86159Augsburg, Germany
| | - Efstratios I. Kamitsos
- Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vassileos Constantinou Avenue, 11635Athens, Greece
| | - Jonathan Massera
- Faculty of Medicine and Health Technology, Tampere University, Korkeakoulunkatu 3, 33720Tampere, Finland
| | - Delia S. Brauer
- Otto Schott Institute of Materials Research, Friedrich Schiller University Jena, Fraunhoferstr. 6, 07743Jena, Germany
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2
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Soles CL, Burns AB, Ito K, Chan EP, Douglas JF, Wu J, Yee AF, Shih YT, Huang L, Dimeo RM, Tyagi M. Why Enhanced Subnanosecond Relaxations Are Important for Toughness in Polymer Glasses. Macromolecules 2021. [DOI: 10.1021/acs.macromol.0c02574] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Christopher L. Soles
- NIST Materials Science and Engineering Division, 100 Bureau Drive, Gaithersburg, Maryland 20899, United States
| | - Adam B. Burns
- NIST Materials Science and Engineering Division, 100 Bureau Drive, Gaithersburg, Maryland 20899, United States
| | - Kanae Ito
- NIST Materials Science and Engineering Division, 100 Bureau Drive, Gaithersburg, Maryland 20899, United States
| | - Edwin P. Chan
- NIST Materials Science and Engineering Division, 100 Bureau Drive, Gaithersburg, Maryland 20899, United States
| | - Jack F. Douglas
- NIST Materials Science and Engineering Division, 100 Bureau Drive, Gaithersburg, Maryland 20899, United States
| | - Jinhuang Wu
- Macromolecular Science and Engineering Program, University of Michigan, 2800 Plymouth Road, Ann Arbor, Michigan 48109, United States
| | - Albert F. Yee
- Department of Chemical and Biological Engineering, University of California, Irvine, California 92697, United States
| | - Yueh-Ting Shih
- Department of Materials Science and Engineering, Rensselaer Polytechnic Institute, 110 8th Street, Troy, New York 12180, United States
| | - Liping Huang
- Department of Materials Science and Engineering, Rensselaer Polytechnic Institute, 110 8th Street, Troy, New York 12180, United States
| | - Robert M. Dimeo
- NIST Center for Neutron Research, 100 Bureau Drive, Gaithersburg, Maryland 20899, United States
| | - Madhusudan Tyagi
- NIST Center for Neutron Research, 100 Bureau Drive, Gaithersburg, Maryland 20899, United States
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3
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Dajnowicz S, Cheng Y, Daemen LL, Weiss KL, Gerlits O, Mueser TC, Kovalevsky A. Substrate Binding Stiffens Aspartate Aminotransferase by Altering the Enzyme Picosecond Vibrational Dynamics. ACS OMEGA 2020; 5:18787-18797. [PMID: 32775880 PMCID: PMC7408236 DOI: 10.1021/acsomega.0c01900] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Accepted: 07/14/2020] [Indexed: 06/11/2023]
Abstract
Protein dynamics on various time scales from femtoseconds to milliseconds impacts biological function by driving proteins to conformations conducive to ligand binding and creating functional states in enzyme catalysis. Neutron vibrational spectroscopy carried out by measuring inelastic neutron scattering from protein molecules in combination with molecular simulations has the unique ability of detecting and visualizing changes in the picosecond protein vibrational dynamics due to ligand binding. Here we present neutron vibrational spectra of a homodimeric pyridoxal 5'-phosphate-dependent enzyme, aspartate aminotransferase, obtained from the open internal aldimine and closed external aldimine conformational states. We observe that in the external aldimine state the protein structure stiffens relative to the internal aldimine state, indicating rigidified vibrational dynamics on the picosecond time scale in the low-frequency regime of 5-50 cm-1. Our molecular dynamics simulations indicate substantial changes in the picosecond dynamics of the enzyme secondary structure elements upon substrate binding, with the largest contributions from just two helices and the β-sheet.
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Affiliation(s)
- Steven Dajnowicz
- Neutron
Scattering Division, Oak Ridge National
Laboratory, Oak Ridge, Tennessee 37830, United States
- Department
of Chemistry and Biochemistry, University
of Toledo, Toledo, Ohio 43606, United States
| | - Yongqiang Cheng
- Neutron
Scattering Division, Oak Ridge National
Laboratory, Oak Ridge, Tennessee 37830, United States
| | - Luke L. Daemen
- Neutron
Scattering Division, Oak Ridge National
Laboratory, Oak Ridge, Tennessee 37830, United States
| | - Kevin L. Weiss
- Neutron
Scattering Division, Oak Ridge National
Laboratory, Oak Ridge, Tennessee 37830, United States
| | - Oksana Gerlits
- Department
of Natural Sciences, Tennessee Wesleyan
University, Athens, Tennessee 37303, United States
| | - Timothy C. Mueser
- Department
of Chemistry and Biochemistry, University
of Toledo, Toledo, Ohio 43606, United States
| | - Andrey Kovalevsky
- Neutron
Scattering Division, Oak Ridge National
Laboratory, Oak Ridge, Tennessee 37830, United States
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4
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Khomich AA, Khmelnitsky RA, Khomich AV. Probing the Nanostructure of Neutron-Irradiated Diamond Using Raman Spectroscopy. NANOMATERIALS 2020; 10:nano10061166. [PMID: 32549323 PMCID: PMC7353327 DOI: 10.3390/nano10061166] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/03/2020] [Revised: 06/09/2020] [Accepted: 06/10/2020] [Indexed: 11/16/2022]
Abstract
Disordering of crystal lattice induced by irradiation with fast neutrons and other high-energy particles is used for the deep modification of electrical and optical properties of diamonds via significant nanoscale restructuring and defects engineering. Raman spectroscopy was employed to investigate the nature of radiation damage below the critical graphitization level created when chemical vapor deposition and natural diamonds are irradiated by fast neutrons with fluencies from 1 × 1018 to 3 × 1020 cm−2 and annealed at the 100–1700 °C range. The significant changes in the diamond Raman spectra versus the neutron-irradiated conditions are associated with the formation of intrinsic irradiation-induced defects that do not completely destroy the crystalline feature but decrease the phonon coherence length as the neutron dose increases. It was shown that the Raman spectrum of radiation-damaged diamonds is determined by the phonon confinement effect and that the boson peak is present in the Raman spectra up to annealing at 800–1000 °C. Three groups of defect-induced bands (first group = 260, 495, and 730 cm−1; second group = 230, 500, 530, 685, and 760 cm–1; and third group = 335, 1390, 1415, and 1740 cm−1) were observed in Raman spectra of fast-neutron-irradiated diamonds.
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Affiliation(s)
- Andrey A. Khomich
- Kotelnikov Institute of Radio-Engineering and Electronics of the Russian Academy of Sciences, pl. Vvedenskogo 1, 141190 Fryazino, Russia; (R.A.K.); (A.V.K.)
- Correspondence:
| | - Roman A. Khmelnitsky
- Kotelnikov Institute of Radio-Engineering and Electronics of the Russian Academy of Sciences, pl. Vvedenskogo 1, 141190 Fryazino, Russia; (R.A.K.); (A.V.K.)
- Lebedev Institute of Physics of the Russian Academy of Sciences, Leninsky pr. 53, 117924 Moscow, Russia
| | - Alexander V. Khomich
- Kotelnikov Institute of Radio-Engineering and Electronics of the Russian Academy of Sciences, pl. Vvedenskogo 1, 141190 Fryazino, Russia; (R.A.K.); (A.V.K.)
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5
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Ding G, Li C, Zaccone A, Wang WH, Lei HC, Jiang F, Ling Z, Jiang MQ. Ultrafast extreme rejuvenation of metallic glasses by shock compression. SCIENCE ADVANCES 2019; 5:eaaw6249. [PMID: 31467974 PMCID: PMC6707777 DOI: 10.1126/sciadv.aaw6249] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/10/2019] [Accepted: 07/16/2019] [Indexed: 06/10/2023]
Abstract
Structural rejuvenation of glasses not only provides fundamental insights into their complicated dynamics but also extends their practical applications. However, it is formidably challenging to rejuvenate a glass on very short time scales. Here, we present the first experimental evidence that a specially designed shock compression technique can rapidly rejuvenate metallic glasses to extremely high-enthalpy states within a very short time scale of about 365 ± 8 ns. By controlling the shock stress amplitude, the shock-induced rejuvenation is successfully frozen at different degrees. The underlying structural disordering is quantitatively characterized by the anomalous boson heat capacity peak of glasses. A Deborah number, defined as a competition of time scales between the net structural disordering and the applied loading, is introduced to explain the observed ultrafast rejuvenation phenomena of metallic glasses.
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Affiliation(s)
- G. Ding
- State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
- State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China
| | - C. Li
- State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
- School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China
| | - A. Zaccone
- Department of Physics, University of Milan, via Celoria 16, Milano 20133, Italy
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge CB2 3RA, UK
- Cavendish Laboratory, University of Cambridge, Cambridge CB3 9HE, UK
| | - W. H. Wang
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - H. C. Lei
- Department of Physics, Renmin University of China, Beijing 100872, China
| | - F. Jiang
- State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China
| | - Z. Ling
- State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
| | - M. Q. Jiang
- State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
- School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China
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6
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Metallic Glasses: A New Approach to the Understanding of the Defect Structure and Physical Properties. METALS 2019. [DOI: 10.3390/met9050605] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The work is devoted to a brief overview of the Interstitialcy Theory (IT) as applied to different relaxation phenomena occurring in metallic glasses upon structural relaxation and crystallization. The basic hypotheses of the IT and their experimental verification are shortly considered. The main focus is given on the interpretation of recent experiments on the heat effects, volume changes and their link with the shear modulus relaxation. The issues related to the development of the IT and its relationship with other models on defects in metallic glasses are discussed.
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7
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Yang J, Wang YJ, Ma E, Zaccone A, Dai LH, Jiang MQ. Structural Parameter of Orientational Order to Predict the Boson Vibrational Anomaly in Glasses. PHYSICAL REVIEW LETTERS 2019; 122:015501. [PMID: 31012708 DOI: 10.1103/physrevlett.122.015501] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2018] [Indexed: 06/09/2023]
Abstract
It has so far remained a major challenge to quantitatively predict the boson peak, a THz vibrational anomaly universal for glasses, from features in the amorphous structure. Using molecular dynamics simulations of a model Cu_{50}Zr_{50} glass, we decompose the boson peak to contributions from atoms residing in different types of Voronoi polyhedra. We then introduce a microscopic structural parameter to depict the "orientational order," using the vector pointing from the center atom to the farthest vertex of its Voronoi coordination polyhedron. This order parameter represents the most probable direction of transverse vibration at low frequencies. Its magnitude scales linearly with the boson peak intensity, and its spatial distribution accounts for the quasilocalized modes. This correlation is shown to be universal for different types of glasses.
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Affiliation(s)
- J Yang
- State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- School of Engineering Science, University of Chinese Academy of Sciences, Beijing 101408, People's Republic of China
| | - Yun-Jiang Wang
- State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- School of Engineering Science, University of Chinese Academy of Sciences, Beijing 101408, People's Republic of China
| | - E Ma
- Department of Materials Science and Engineering, John Hopkins University, Baltimore, Maryland 21218, USA
| | - A Zaccone
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge CB2 3RA, United Kingdom
- Cavendish Laboratory, University of Cambridge, Cambridge CB3 9HE, United Kingdom
- Department of Physics, University of Milan, via Celoria 16, Milano 20133, Italy
| | - L H Dai
- State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- School of Engineering Science, University of Chinese Academy of Sciences, Beijing 101408, People's Republic of China
| | - M Q Jiang
- State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
- School of Engineering Science, University of Chinese Academy of Sciences, Beijing 101408, People's Republic of China
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9
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Sanz A, Hansen HW, Jakobsen B, Pedersen IH, Capaccioli S, Adrjanowicz K, Paluch M, Gonthier J, Frick B, Lelièvre-Berna E, Peters J, Niss K. High-pressure cell for simultaneous dielectric and neutron spectroscopy. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2018; 89:023904. [PMID: 29495850 DOI: 10.1063/1.5007021] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
In this article, we report on the design, manufacture, and testing of a high-pressure cell for simultaneous dielectric and neutron spectroscopy. This cell is a unique tool for studying dynamics on different time scales, from kilo- to picoseconds, covering universal features such as the α relaxation and fast vibrations at the same time. The cell, constructed in cylindrical geometry, is made of a high-strength aluminum alloy and operates up to 500 MPa in a temperature range between roughly 2 and 320 K. In order to measure the scattered neutron intensity and the sample capacitance simultaneously, a cylindrical capacitor is positioned within the bore of the high-pressure container. The capacitor consists of two concentric electrodes separated by insulating spacers. The performance of this setup has been successfully verified by collecting simultaneous dielectric and neutron spectroscopy data on dipropylene glycol, using both backscattering and time-of-flight instruments. We have carried out the experiments at different combinations of temperature and pressure in both the supercooled liquid and glassy state.
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Affiliation(s)
- Alejandro Sanz
- Glass and Time, IMFUFA, Department of Science and Environment, Roskilde University, P.O. Box 260, DK-4000 Roskilde, Denmark
| | - Henriette Wase Hansen
- Glass and Time, IMFUFA, Department of Science and Environment, Roskilde University, P.O. Box 260, DK-4000 Roskilde, Denmark
| | - Bo Jakobsen
- Glass and Time, IMFUFA, Department of Science and Environment, Roskilde University, P.O. Box 260, DK-4000 Roskilde, Denmark
| | - Ib H Pedersen
- Glass and Time, IMFUFA, Department of Science and Environment, Roskilde University, P.O. Box 260, DK-4000 Roskilde, Denmark
| | | | - Karolina Adrjanowicz
- Institute of Physics, University of Silesia, ul. Uniwersytecka 4, 40-007 Katowice, Poland
| | - Marian Paluch
- Institute of Physics, University of Silesia, ul. Uniwersytecka 4, 40-007 Katowice, Poland
| | - Julien Gonthier
- Institut Laue-Langevin, CS 20156, 38042 Grenoble Cedex 9, France
| | - Bernhard Frick
- Institut Laue-Langevin, CS 20156, 38042 Grenoble Cedex 9, France
| | | | - Judith Peters
- Institut Laue-Langevin, CS 20156, 38042 Grenoble Cedex 9, France
| | - Kristine Niss
- Glass and Time, IMFUFA, Department of Science and Environment, Roskilde University, P.O. Box 260, DK-4000 Roskilde, Denmark
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10
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Charbonneau P, Corwin EI, Parisi G, Poncet A, Zamponi F. Universal Non-Debye Scaling in the Density of States of Amorphous Solids. PHYSICAL REVIEW LETTERS 2016; 117:045503. [PMID: 27494482 DOI: 10.1103/physrevlett.117.045503] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2016] [Indexed: 06/06/2023]
Abstract
At the jamming transition, amorphous packings are known to display anomalous vibrational modes with a density of states (DOS) that remains constant at low frequency. The scaling of the DOS at higher packing fractions remains, however, unclear. One might expect to find a simple Debye scaling, but recent results from effective medium theory and the exact solution of mean-field models both predict an anomalous, non-Debye scaling. Being mean-field in nature, however, these solutions are only strictly valid in the limit of infinite spatial dimension, and it is unclear what value they have for finite-dimensional systems. Here, we study packings of soft spheres in dimensions 3 through 7 and find, away from jamming, a universal non-Debye scaling of the DOS that is consistent with the mean-field predictions. We also consider how the soft mode participation ratio evolves as dimension increases.
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Affiliation(s)
- Patrick Charbonneau
- Department of Chemistry, Duke University, Durham, North Carolina 27708, USA
- Department of Physics, Duke University, Durham, North Carolina 27708, USA
| | - Eric I Corwin
- Department of Physics, University of Oregon, Eugene, Oregon 97403, USA
| | - Giorgio Parisi
- Dipartimento di Fisica, Sapienza Università di Roma, INFN, Sezione di Roma I, IPFC-CNR, Piazzale Aldo Moro 2, I-00185 Roma, Italy
| | - Alexis Poncet
- Department of Physics, University of Oregon, Eugene, Oregon 97403, USA
- Département de Physique, École Normale Supérieure, 24 Rue Lhomond, 75005 Paris, France
| | - Francesco Zamponi
- Laboratoire de Physique Théorique, ENS & PSL University, UPMC & Sorbonne Universités, UMR 8549 CNRS, 75005 Paris, France
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11
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Hufnagel TC. Metallic glasses: Cryogenic rejuvenation. NATURE MATERIALS 2015; 14:867-868. [PMID: 26288974 DOI: 10.1038/nmat4394] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Affiliation(s)
- Todd C Hufnagel
- Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland 21218-2608, USA
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12
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Busselez R, Pezeril T, Gusev VE. Structural heterogeneities at the origin of acoustic and transport anomalies in glycerol glass-former. J Chem Phys 2015; 140:234505. [PMID: 24952550 DOI: 10.1063/1.4883504] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
By means of large scale molecular dynamics simulations, we explore mesoscopic properties of prototypical glycerol glass-former above and below the glass transition. The model used, in excellent agreement with various experimental techniques, permits to carefully study the structure and the vibrational dynamics. We find that a medium range order is present in glycerol glass-former and arises from hydrogen bond network extension. The characteristic size of the structural heterogeneities is related to the anomalous properties of acoustic vibrations (Rayleigh scattering, "mode softening," and Boson Peak) in the glassy state. Finally the characteristic size of these heterogeneities, nearly constant in temperature, is also connected to the cross-over between structural relaxation and diffusion in liquid glycerol.
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Affiliation(s)
- Rémi Busselez
- Institut des Molécules et Matériaux du Mans UMR-CNRS 6283, Université du Maine, Le Mans, France
| | - Thomas Pezeril
- Institut des Molécules et Matériaux du Mans UMR-CNRS 6283, Université du Maine, Le Mans, France
| | - Vitalyi E Gusev
- Laboratoire d'Acoustique de l'Université du Maine, UMR-CNRS 6613 Université du Maine, Le Mans, France
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13
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Pérez-Castañeda T, Jiménez-Riobóo RJ, Ramos MA. Two-level systems and boson peak remain stable in 110-million-year-old amber glass. PHYSICAL REVIEW LETTERS 2014; 112:165901. [PMID: 24815658 DOI: 10.1103/physrevlett.112.165901] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2014] [Indexed: 06/03/2023]
Abstract
The two most prominent and ubiquitous features of glasses at low temperatures, namely the presence of tunneling two-level systems and the so-called boson peak in the reduced vibrational density of states, are shown to persist essentially unchanged in highly stabilized glasses, contrary to what was usually envisaged. Specifically, we have measured the specific heat of 110 million-year-old amber samples from El Soplao (Spain), both at very low temperatures and around the glass transition Tg. In particular, the amount of two-level systems, assessed at the lowest temperatures, was surprisingly found to be exactly the same for the pristine hyperaged amber as for the, subsequently, partially and fully rejuvenated samples.
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Affiliation(s)
- Tomás Pérez-Castañeda
- Laboratorio de Bajas Temperaturas, Departamento de Física de la Materia Condensada, Condensed Matter Physics Center (IFIMAC) and Instituto Nicolás Cabrera, Universidad Autónoma de Madrid, E-28049 Madrid, Spain
| | - Rafael J Jiménez-Riobóo
- Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Científicas (ICMM-CSIC), E-28049 Madrid, Spain
| | - Miguel A Ramos
- Laboratorio de Bajas Temperaturas, Departamento de Física de la Materia Condensada, Condensed Matter Physics Center (IFIMAC) and Instituto Nicolás Cabrera, Universidad Autónoma de Madrid, E-28049 Madrid, Spain
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14
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Low-Frequency, Functional, Modes of Proteins: All-Atom and Coarse-Grained Normal Mode Analysis. COMPUTATIONAL METHODS TO STUDY THE STRUCTURE AND DYNAMICS OF BIOMOLECULES AND BIOMOLECULAR PROCESSES 2014. [DOI: 10.1007/978-3-642-28554-7_15] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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15
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Marruzzo A, Schirmacher W, Fratalocchi A, Ruocco G. Heterogeneous shear elasticity of glasses: the origin of the boson peak. Sci Rep 2013; 3:1407. [PMID: 23470597 PMCID: PMC3591752 DOI: 10.1038/srep01407] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2012] [Accepted: 02/19/2013] [Indexed: 11/09/2022] Open
Abstract
The local elasticity of glasses is known to be inhomogeneous on a microscopic scale compared to that of crystalline materials. Their vibrational spectrum strongly deviates from that expected from Debye's elasticity theory: The density of states deviates from Debye's law, the sound velocity shows a negative dispersion in the boson-peak frequency regime and there is a strong increase of the sound attenuation near the boson-peak frequency. By comparing a mean-field theory of shear-elastic heterogeneity with a large-scale simulation of a soft-sphere glass we demonstrate that the observed anomalies in glasses are caused by elastic heterogeneity. By observing that the macroscopic bulk modulus is frequency independent we show that the boson-peak-related vibrational anomalies are predominantly due to the spatially fluctuating microscopic shear stresses. It is demonstrated that the boson-peak arises from the steep increase of the sound attenuation at a frequency which marks the transition from wave-like excitations to disorder-dominated ones.
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Affiliation(s)
- Alessia Marruzzo
- Dipartimento di Fisica, Universitá di Roma La Sapienza, Roma, Italy
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