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Mashita R, Saito M, Yoda Y, Nagasawa N, Bito Y, Kikuchi T, Kishimoto H, Seto M, Kanaya T. Microscopic Observation of the Anisotropy of the Johari-Goldstein-β Process in Cross-Linked Polybutadiene on Stretching by Time-Domain Interferometry. ACS Macro Lett 2024; 13:847-852. [PMID: 38916259 DOI: 10.1021/acsmacrolett.4c00274] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/26/2024]
Abstract
The strain dependence of the Johari-Goldstein (JG)-β relaxation time, as well as the directional dependence, was systematically investigated for stretched cross-linked polybutadiene using time-domain interferometry. We found that the strain dependence of the JG-β relaxation time is directionally dependent, contrary to expectation: the relaxation time of the JG-β motion, whose displacement is perpendicular to the stretching direction, decreases with stretching, whereas the relaxation time of the parallel JG-β motion changes little. This result is distinct from the previously reported strain dependence of the α relaxation time, where the relaxation time increases isotropically with stretching. Thus, the difference in the strain dependence of the relaxation time between the α and JG-β processes suggests a microscopic origin and requires the modification of the conventional dynamic picture for stretched polymers.
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Affiliation(s)
- Ryo Mashita
- Research Center for Advanced Technology & Innovation, Research & Development HQ, Sumitomo Rubber Industries Ltd., 1-1, 2-chome, Tsutsui-cho, Chuo-ku, Kobe 651-0071, Japan
| | - Makina Saito
- Department of Physics, Graduate School of Science, Tohoku University, Sendai, Miyagi 980-8578, Japan
| | - Yoshitaka Yoda
- Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5198, Japan
| | - Nobumoto Nagasawa
- Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5198, Japan
| | - Yasumasa Bito
- Research Center for Advanced Technology & Innovation, Research & Development HQ, Sumitomo Rubber Industries Ltd., 1-1, 2-chome, Tsutsui-cho, Chuo-ku, Kobe 651-0071, Japan
| | - Tatsuya Kikuchi
- Research Center for Advanced Technology & Innovation, Research & Development HQ, Sumitomo Rubber Industries Ltd., 1-1, 2-chome, Tsutsui-cho, Chuo-ku, Kobe 651-0071, Japan
| | - Hiroyuki Kishimoto
- Research Center for Advanced Technology & Innovation, Research & Development HQ, Sumitomo Rubber Industries Ltd., 1-1, 2-chome, Tsutsui-cho, Chuo-ku, Kobe 651-0071, Japan
| | - Makoto Seto
- Institute for Integrated Radiation and Nuclear Science, Kyoto University, Sennan, Osaka 590-0494, Japan
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2
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Saito M, Kobayashi M, Nishino H, Hiraki TN, Honjo Y, Kobayashi K, Joti Y, Ozaki K, Imai Y, Yamaga M, Abe T, Nagasawa N, Yoda Y, Mashita R, Hatsui T, Wakabayashi Y. Broadband Quasielastic Scattering Spectroscopy Using a Multiline Frequency Comblike Spectrum in the Hard X-Ray Region. PHYSICAL REVIEW LETTERS 2024; 132:256901. [PMID: 38996231 DOI: 10.1103/physrevlett.132.256901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Revised: 01/24/2024] [Accepted: 04/19/2024] [Indexed: 07/14/2024]
Abstract
We developed a novel quasielastic scattering spectroscopy system that uses a multiline frequency comblike resolution function to overcome the limit on the accessible timescale imposed by the inherent single-energy resolution of conventional spectroscopy systems. The new multiline system possesses multiple resolutions and can efficiently cover a wide time range, from 100 ps to 100 ns, where x-ray-based dynamic measurement techniques are being actively developed. It enables visualization of the relaxation shape and wave-number-dependent dynamic behavior using a two-dimensional detector, as demonstrated for the natural polymer polybutadine without deuteration.
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Affiliation(s)
- Makina Saito
- Department of Physics, Tohoku University, Sendai, Miyagi, 980-8578, Japan
- RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo, Hyogo, 679-5148, Japan
| | - Masashi Kobayashi
- Department of Physics, Tohoku University, Sendai, Miyagi, 980-8578, Japan
- RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo, Hyogo, 679-5148, Japan
| | - Haruki Nishino
- RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo, Hyogo, 679-5148, Japan
- Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1, Kouto, Sayo, Hyogo, 679-5198, Japan
| | | | - Yoshiaki Honjo
- RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo, Hyogo, 679-5148, Japan
| | - Kazuo Kobayashi
- RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo, Hyogo, 679-5148, Japan
- Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1, Kouto, Sayo, Hyogo, 679-5198, Japan
| | - Yasumasa Joti
- RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo, Hyogo, 679-5148, Japan
- Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1, Kouto, Sayo, Hyogo, 679-5198, Japan
| | - Kyosuke Ozaki
- RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo, Hyogo, 679-5148, Japan
| | - Yasuhiko Imai
- RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo, Hyogo, 679-5148, Japan
- Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1, Kouto, Sayo, Hyogo, 679-5198, Japan
| | - Mitsuhiro Yamaga
- RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo, Hyogo, 679-5148, Japan
- Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1, Kouto, Sayo, Hyogo, 679-5198, Japan
| | - Tetsuya Abe
- Department of Physics, Tohoku University, Sendai, Miyagi, 980-8578, Japan
- RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo, Hyogo, 679-5148, Japan
| | - Nobumoto Nagasawa
- Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1, Kouto, Sayo, Hyogo, 679-5198, Japan
| | - Yoshitaka Yoda
- Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1, Kouto, Sayo, Hyogo, 679-5198, Japan
| | - Ryo Mashita
- Chemical Analysis Center, Sumitomo Rubber Industries Ltd., Kobe, Hyogo, 651-0071, Japan
| | - Takaki Hatsui
- RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo, Hyogo, 679-5148, Japan
| | - Yusuke Wakabayashi
- Department of Physics, Tohoku University, Sendai, Miyagi, 980-8578, Japan
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3
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Nagao M, Seto H. Neutron scattering studies on dynamics of lipid membranes. BIOPHYSICS REVIEWS 2023; 4:021306. [PMID: 38504928 PMCID: PMC10903442 DOI: 10.1063/5.0144544] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Accepted: 05/01/2023] [Indexed: 03/21/2024]
Abstract
Neutron scattering methods are powerful tools for the study of the structure and dynamics of lipid bilayers in length scales from sub Å to tens to hundreds nm and the time scales from sub ps to μs. These techniques also are nondestructive and, perhaps most importantly, require no additives to label samples. Because the neutron scattering intensities are very different for hydrogen- and deuterium-containing molecules, one can replace the hydrogen atoms in a molecule with deuterium to prepare on demand neutron scattering contrast without significantly altering the physical properties of the samples. Moreover, recent advances in neutron scattering techniques, membrane dynamics theories, analysis tools, and sample preparation technologies allow researchers to study various aspects of lipid bilayer dynamics. In this review, we focus on the dynamics of individual lipids and collective membrane dynamics as well as the dynamics of hydration water.
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Affiliation(s)
| | - Hideki Seto
- Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan
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4
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Mashita R, Saito M, Yoda Y, Kishimoto H, Seto M, Kanaya T. Microscopic observation of the effects of elongation on the polymer chain dynamics of crosslinked polybutadiene using quasi-elastic γ-ray scattering. JOURNAL OF SYNCHROTRON RADIATION 2022; 29:1180-1186. [PMID: 36073876 PMCID: PMC9455202 DOI: 10.1107/s1600577522007998] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Accepted: 08/08/2022] [Indexed: 06/15/2023]
Abstract
A synchrotron-radiation-based quasi-elastic γ-ray scattering system has been developed that uses time-domain interferometry to observe microscopic polymer dynamics under uniaxial deformation. The stress-producing mechanism of crosslinked polybutadiene has been studied from a microscopic viewpoint. It was found that the mean relaxation time ⟨τ⟩ of the microscopic polymer motion observed over a relatively high temperature (T) range (i.e. T-1 < 0.0045 K-1) increased with elongation on both the intra- and intermolecular scales. Following an extensive strain dependence study, it was found that the strain dependences of both the intra- and intermolecular ⟨τ⟩ changed with the stress dependence. It was therefore suggested that ⟨τ⟩ increased due to the constraint of the local polymer chain motion caused by elongation. The local molecular dynamics of polymer chains under uniaxial deformation could be evaluated at intra- and intermolecular scales separately for the first time using our method.
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Affiliation(s)
- Ryo Mashita
- Chemical Analysis Center, Sumitomo Rubber Industries Ltd, Tsutsui-cho, Chuo-ku, Kobe, Hyogo 651-0071, Japan
| | - Makina Saito
- Department of Physics, Graduate School of Science, Tohoku University, Sendai, Miyagi 980-8578, Japan
| | - Yoshitaka Yoda
- Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5198, Japan
| | - Hiroyuki Kishimoto
- Chemical Analysis Center, Sumitomo Rubber Industries Ltd, Tsutsui-cho, Chuo-ku, Kobe, Hyogo 651-0071, Japan
| | - Makoto Seto
- Institute for Integrated Radiation and Nuclear Science, Kyoto University, Sennan, Osaka 590-0494, Japan
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Pavlik M, Brown DE, Hu MY, Zhao J, Lurio L, Alp EE. High-throughput nuclear resonance time domain interferometry using annular slits. JOURNAL OF SYNCHROTRON RADIATION 2022; 29:677-686. [PMID: 35511001 PMCID: PMC9070725 DOI: 10.1107/s1600577522002843] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Accepted: 03/14/2022] [Indexed: 06/14/2023]
Abstract
Nuclear resonance time domain interferometry (NR-TDI) is used to study the slow dynamics of liquids (that do not require Mössbauer isotopes) at atomic and molecular length scales. Here the TDI method of using a stationary two-line magnetized 57Fe foil as a source and a stationary single-line stainless steel foil analyzer is employed. The new technique of adding an annular slit in front of a single silicon avalanche photodiode detector enables a wide range of momentum transfers (1 to 100 nm-1 by varying the distance between the annular slits and sample) with a high count rate of up to 160 Hz with a Δq resolution of ±1.7 nm-1 at q = 14 nm-1. The sensitivity of this method in determining relaxation times is quantified and discussed. The Kohlrausch-Williams-Watts (KWW) model was used to extract relaxation times for glycerol. These relaxation times give insight into the dynamics of the electron density fluctuations of glycerol as a function of temperature and momentum transfers.
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Affiliation(s)
- Marc Pavlik
- Advanced Photon Source, Argonne National Laboratory, Lemont, IL 60439, USA
- Northern Illinois University, DeKalb, IL 60115, USA
| | | | - Michael Y. Hu
- Advanced Photon Source, Argonne National Laboratory, Lemont, IL 60439, USA
| | - Jiyong Zhao
- Advanced Photon Source, Argonne National Laboratory, Lemont, IL 60439, USA
| | | | - E. Ercan Alp
- Advanced Photon Source, Argonne National Laboratory, Lemont, IL 60439, USA
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6
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Ngai KL, Capaccioli S, Lunkenheimer P, Loidl A. Arriving at the most plausible interpretation of the dielectric spectra of glycerol with help from quasielastic γ-ray scattering time-domain interferometry. Phys Rev E 2022; 105:054609. [PMID: 35706308 DOI: 10.1103/physreve.105.054609] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Accepted: 05/10/2022] [Indexed: 06/15/2023]
Abstract
Glycerol is one of the glass-forming liquids selected by Robert H. Cole in 1950 to start his study of molecular dynamics by dielectric spectroscopy. Seventy-one years have gone by and remarkably no consensus has been reached on the nature and identity of the relaxation processes observed in the dielectric spectra. The macroscopic dielectric relaxation data allow different interpretations to yield contrasting results, and it is not possible to determine which one is most plausible. Coming to the rescue is the application of the nuclear γ-resonance time-domain interferometry (TDI) to glycerol by Saito et al. [Phys. Rev. E 105, L012605 (2022)10.1103/PhysRevE.105.L012605]. Their microscopic TDI data potentially can decide which interpretation of the dielectric spectra of glycerol is most plausible. The attempt was made by Saito et al., but there is a problem in their analysis of the dielectric data of glycerol and hence their conclusion is untenable. In this paper, we critically compare four major interpretations with the TDI data in an effort to identify the most plausible interpretation of the relaxation processes constituting the dielectric spectra of glycerol.
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Affiliation(s)
- K L Ngai
- CNR-IPCF, Largo Bruno Pontecorvo 3, I-56127 Pisa, Italy
| | - S Capaccioli
- CNR-IPCF, Largo Bruno Pontecorvo 3, I-56127 Pisa, Italy
- Dipartimento di Fisica, Università di Pisa, Largo Bruno Pontecorvo 3, I-56127 Pisa, Italy
| | - P Lunkenheimer
- Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, D-86135 Augsburg, Germany
| | - A Loidl
- Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, D-86135 Augsburg, Germany
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7
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Senses E, Kitchens CL, Faraone A. Viscosity reduction in polymer nanocomposites: Insights from dynamic neutron and X‐ray scattering. JOURNAL OF POLYMER SCIENCE 2022. [DOI: 10.1002/pol.20210320] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Erkan Senses
- Department of Chemical and Biological Engineering Koc University Istanbul Turkey
| | - Christopher L. Kitchens
- Department of Chemical and Biomolecular Engineering Clemson University Clemson South Carolina USA
| | - Antonio Faraone
- Center for Neutron Research National Institute of Standards and Technology Gaithersburg Maryland USA
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8
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Saito M, Kurokuzu M, Yoda Y, Seto M. Microscopic observation of hidden Johari-Goldstein-β process in glycerol. Phys Rev E 2022; 105:L012605. [PMID: 35193193 DOI: 10.1103/physreve.105.l012605] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Accepted: 12/27/2021] [Indexed: 06/14/2023]
Abstract
The Johari-Goldstein-β (JG-β) process is widely observed in a variety of glass-forming systems and recognized as an intrinsic process in deeply supercooled and glassy states. However, in some systems, e.g., glycerol, a clear sign of the JG-β process is often not apparent; for example, an isolated JG-β peak may not be observed in the dielectric relaxation spectrum. In this study, we directly investigated the angstrom-scale dynamics of glycerol through quasielastic scattering experiments using time-domain interferometry. The relaxation times of the local motions start to decouple from the timescale of the diffusion process and follow the established behavior of the JG-β process. This finding microscopically indicates the existence of the hidden JG-β process in glycerol. In addition, we succeeded in determining the decoupling temperature of the JG-β process by using the spatial-scale selectivity of the quasielastic scattering technique.
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Affiliation(s)
- Makina Saito
- Institute for Integrated Radiation and Nuclear Science, Kyoto University, Kumatori, Osaka 590-0494, Japan
- Department of Physics, Tohoku University, Sendai, Miyagi 980-8578, Japan
| | - Masayuki Kurokuzu
- Institute for Integrated Radiation and Nuclear Science, Kyoto University, Kumatori, Osaka 590-0494, Japan
| | - Yoshitaka Yoda
- Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5198, Japan
| | - Makoto Seto
- Institute for Integrated Radiation and Nuclear Science, Kyoto University, Kumatori, Osaka 590-0494, Japan
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9
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Nagao M, Kelley EG, Faraone A, Saito M, Yoda Y, Kurokuzu M, Takata S, Seto M, Butler PD. Relationship between Viscosity and Acyl Tail Dynamics in Lipid Bilayers. PHYSICAL REVIEW LETTERS 2021; 127:078102. [PMID: 34459628 DOI: 10.1103/physrevlett.127.078102] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2021] [Accepted: 06/28/2021] [Indexed: 06/13/2023]
Abstract
Membrane viscosity is a fundamental property that controls molecular transport and structural rearrangements in lipid membranes. Given its importance in many cell processes, various experimental and computational methods have been developed to measure the membrane viscosity, yet the estimated values depend highly on the method and vary by orders of magnitude. Here we investigate the molecular origins of membrane viscosity by measuring the nanoscale dynamics of the lipid acyl tails using x-ray and neutron spectroscopy techniques. The results show that the membrane viscosity can be estimated from the structural relaxation times of the lipid tails.
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Affiliation(s)
- Michihiro Nagao
- National Institute of Standards and Technology Center for Neutron Research, Gaithersburg, Maryland 20899-6102, USA
- Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742-2115, USA
- Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716, USA
| | - Elizabeth G Kelley
- National Institute of Standards and Technology Center for Neutron Research, Gaithersburg, Maryland 20899-6102, USA
| | - Antonio Faraone
- National Institute of Standards and Technology Center for Neutron Research, Gaithersburg, Maryland 20899-6102, USA
| | - Makina Saito
- Institute for Integrated Radiation and Nuclear Science, Kyoto University, Kumatori, Osaka, 590-0494, Japan
| | - Yoshitaka Yoda
- Japan Synchrotron Radiation Research Institute, Sayo, Hyogo, 679-5198, Japan
| | - Masayuki Kurokuzu
- Institute for Integrated Radiation and Nuclear Science, Kyoto University, Kumatori, Osaka, 590-0494, Japan
| | - Shinichi Takata
- J-PARC Center, Japan Atomic Energy Agency, Tokai, Ibaraki, 319-1195, Japan
| | - Makoto Seto
- Institute for Integrated Radiation and Nuclear Science, Kyoto University, Kumatori, Osaka, 590-0494, Japan
| | - Paul D Butler
- National Institute of Standards and Technology Center for Neutron Research, Gaithersburg, Maryland 20899-6102, USA
- Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, Delaware 19716, USA
- Department of Chemistry, The University of Tennessee, Knoxville, Tennessee 37996, USA
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10
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Caporaletti F, Capaccioli S, Valenti S, Mikolasek M, Chumakov AI, Monaco G. Experimental evidence of mosaic structure in strongly supercooled molecular liquids. Nat Commun 2021; 12:1867. [PMID: 33767148 PMCID: PMC7994800 DOI: 10.1038/s41467-021-22154-8] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2020] [Accepted: 02/25/2021] [Indexed: 11/25/2022] Open
Abstract
When a liquid is cooled to produce a glass its dynamics, dominated by the structural relaxation, become very slow, and at the glass-transition temperature Tg its characteristic relaxation time is about 100 s. At slightly elevated temperatures (~1.2 Tg) however, a second process known as the Johari-Goldstein relaxation, βJG, decouples from the structural one and remains much faster than it down to Tg. While it is known that the βJG-process is strongly coupled to the structural relaxation, its dedicated role in the glass-transition remains under debate. Here we use an experimental technique that permits us to investigate the spatial and temporal properties of the βJG relaxation, and give evidence that the molecules participating in it are highly mobile and spatially connected in a system-spanning, percolating cluster. This correlation of structural and dynamical properties provides strong experimental support for a picture, drawn from theoretical studies, of an intermittent mosaic structure in the deeply supercooled liquid phase. The Johari-Goldstein relaxation is a precursor of the glass transition in liquids. Caporaletti et al. use time-dependent interferometry data to substantiate its suggested structural appearance as a globally percolating, fluctuating mosaic.
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Affiliation(s)
- F Caporaletti
- Dipartimento di Fisica, Università di Trento, Povo (Trento), Italy. .,Van der Waals-Zeeman Institute, Institute of Physics/Van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Amsterdam, the Netherlands.
| | - S Capaccioli
- Dipartimento di Fisica, Università di Pisa, Pisa, Italy.,CISUP, Centro per l'Integrazione della Strumentazione dell'Università di Pisa, Pisa, Italy
| | - S Valenti
- Department of Physics, Universitat Politécnica de Catalunya, Barcelona, Spain
| | - M Mikolasek
- ESRF-The European Synchrotron, CS40220, Grenoble Cedex 9, France
| | - A I Chumakov
- ESRF-The European Synchrotron, CS40220, Grenoble Cedex 9, France.,National Research Center 'Kurchatov Institute', Moscow, Russia
| | - G Monaco
- Dipartimento di Fisica, Università di Trento, Povo (Trento), Italy. .,Dipartimento di Fisica ed Astronomia, Università di Padova, Padova, Italy.
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11
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Caporaletti F, Capaccioli S, Valenti S, Mikolasek M, Chumakov AI, Monaco G. A microscopic look at the Johari-Goldstein relaxation in a hydrogen-bonded glass-former. Sci Rep 2019; 9:14319. [PMID: 31586113 PMCID: PMC6778113 DOI: 10.1038/s41598-019-50824-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Accepted: 09/03/2019] [Indexed: 11/23/2022] Open
Abstract
Understanding the glass transition requires getting the picture of the dynamical processes that intervene in it. Glass-forming liquids show a characteristic decoupling of relaxation processes when they are cooled down towards the glassy state. The faster (βJG) process is still under scrutiny, and its full explanation necessitates information at the microscopic scale. To this aim, nuclear γ-resonance time-domain interferometry (TDI) has been utilized to investigate 5-methyl-2-hexanol, a hydrogen-bonded liquid with a pronounced βJG process as measured by dielectric spectroscopy. TDI probes in fact the center-of-mass, molecular dynamics at scattering-vectors corresponding to both inter- and intra-molecular distances. Our measurements demonstrate that, in the undercooled liquid phase, the βJG relaxation can be visualized as a spatially-restricted rearrangement of molecules within the cage of their closest neighbours accompanied by larger excursions which reach out at least the inter-molecular scale and are related to cage-breaking events. In-cage rattling and cage-breaking processes therefore coexist in the βJG relaxation.
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Affiliation(s)
- F Caporaletti
- Dipartimento di Fisica, Università di Trento, I-38123, Povo, Trento, Italy.
| | - S Capaccioli
- Dipartimento di Fisica, Università di Pisa, Largo Bruno Pontecorvo 3, I-56127, Pisa, Italy
- CNR-IPCF, Largo Bruno Pontecorvo 3, I-56127, Pisa, Italy
| | - S Valenti
- Grup de Caracterització de Materials, Department of Physics, Universitat Politècnica de Catalunya, EEBE, Av. Eduard Maristany 10-14, E-08019, Barcelona, Spain
| | - M Mikolasek
- ESRF-The European Synchrotron, CS40 220, 38043, Grenoble, Cedex 9, France
| | - A I Chumakov
- ESRF-The European Synchrotron, CS40 220, 38043, Grenoble, Cedex 9, France
- National Research Center "Kurchatov Institute", 123182, Moscow, Russia
| | - G Monaco
- Dipartimento di Fisica, Università di Trento, I-38123, Povo, Trento, Italy.
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12
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Castrignano S, Evers J. Probing Quantum Dynamical Couple Correlations with Time-Domain Interferometry. PHYSICAL REVIEW LETTERS 2019; 122:025301. [PMID: 30720290 DOI: 10.1103/physrevlett.122.025301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Indexed: 06/09/2023]
Abstract
Time-domain interferometry (TDI) is a promising method to characterize spatial and temporal correlations at x-ray energies, via the so-called intermediate scattering function and the related dynamical couple correlations. However, so far, it has only been analyzed for classical target systems. Here, we provide a quantum analysis, and suggest a scheme that allows us to access quantum dynamical correlations. We further show how TDI can be used to exclude classical models for the target dynamics, and illustrate our results using a single particle in a double well potential.
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Affiliation(s)
| | - Jörg Evers
- Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
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13
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Yamaguchi T, Saito M, Yoshida K, Yamaguchi T, Yoda Y, Seto M. Structural Relaxation and Viscoelasticity of a Higher Alcohol with Mesoscopic Structure. J Phys Chem Lett 2018; 9:298-301. [PMID: 29290123 DOI: 10.1021/acs.jpclett.7b02907] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
This work studied the slow dynamics of liquids with mesoscopic structure and its relation to shear viscosity. Quasielastic scattering measurements were made on a liquid higher alcohol, 3,7-dimethyl-1-octanol, using γ-ray time-domain interferometry at a synchrotron radiation facility, SPring-8. The quasielastic scattering spectra were measured to determine the structural relaxation at two wavenumbers of the prepeak and the main peak of the static structure factor. It was found that relaxation at the prepeak is more than 10 times slower than that at the main peak. Compared with the viscoelastic spectrum, which exhibits bimodal relaxation, the relaxations at the prepeak and the main peak were shown to correspond to the slower and faster modes of the viscoelastic relaxation, respectively. This indicates that the dynamics of the mesoscopic structure represented as the prepeak contributes to the shear viscosity through the slowest mode of the viscoelastic relaxation.
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Affiliation(s)
- Tsuyoshi Yamaguchi
- Graduate School of Engineering, Nagoya University , Furo-cho B2-3 (611), Chikusa, Nagoya, Aichi 464-8603, Japan
| | - Makina Saito
- Research Reactor Institute, Kyoto University , Kumatori, Osaka 590-0494, Japan
| | - Koji Yoshida
- Department of Chemistry, Faculty of Science, Fukuoka University , Nanakuma, Jonan, Fukuoka 814-0180, Japan
| | - Toshio Yamaguchi
- Department of Chemistry, Faculty of Science, Fukuoka University , Nanakuma, Jonan, Fukuoka 814-0180, Japan
| | - Yoshitaka Yoda
- Research and Utilization Division, Japan Synchrotron Radiation Research Institute , Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan
| | - Makoto Seto
- Research Reactor Institute, Kyoto University , Kumatori, Osaka 590-0494, Japan
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