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Gupta A, Hillier AD, Telling MTF, Srivastava SK. Local magnetic behaviour of highly disordered undoped and Co-doped Bi2Se3 nanoplates: a muon spin relaxation study. Nanotechnology 2022; 33:215701. [PMID: 35130523 DOI: 10.1088/1361-6528/ac5285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2021] [Accepted: 02/07/2022] [Indexed: 06/14/2023]
Abstract
Magnetism induced by defects in nominally non-magnetic solids has attracted intense scientific interest in recent years. The local magnetism in highly disordered undoped and Co-doped topological insulator (TI) Bi2Se3nanoplates has been investigated by muon spin relaxation (μSR). UsingμSR spectroscopy, together with other macroscopic characterizations, we find that these nanoplates are composed of a core with both static fields and dynamically fluctuating moments, and a shell with purely dynamically fluctuating moments. The fluctuations in the core die out at low temperatures, while those in the shell continue till 2 K. When Bi2Se3is doped with Co, the static magnetic component increases, whilst keeping the dual (static-plus-dynamic) nature intact. The findings indicate that highly disordered TI's could constitute a new class of promising magnetic materials that can be engineered by magnetic impurity doping.
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Affiliation(s)
- Anu Gupta
- Department of Physics, Indian Institute of Technology Kharagpur, Kharagpur 721302, India
| | - A D Hillier
- ISIS Neutron and Muon Facility, STFC Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, United Kingdom
| | - M T F Telling
- ISIS Neutron and Muon Facility, STFC Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, United Kingdom
| | - S K Srivastava
- Department of Physics, Indian Institute of Technology Kharagpur, Kharagpur 721302, India
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2
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Petersen MH, Telling MTF, Kneller G, Bordallo HN. Revisiting the modeling of quasielastic neutron scattering from bulk water. EPJ Web Conf 2022. [DOI: 10.1051/epjconf/202227201012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Quasi-elastic neutron scattering (QENS) from bulk-water at 300 K, measured on the IRIS backscattering neutron spectrometer (ISIS, UK), is interpreted using the jump diffusion model (JDM), a “minimalistic” multi-timescale relaxation model (MRM) and molecular dynamics simulations (MD). In the case of MRM data analysis is performed in the time domain, where the relaxation of the intermediate scattering function is described by a stretched Mittag-Leffler function, Eα(−(|t|/τ)α). This function displays an asymptotic power law decay and contains the exponential relaxation function as a special case (α = 1). To further compare the two approaches, MD simulations of bulk water were performed using the SPCE force field and the resulting MD trajectories analysed using the nMoldyn software. We show that both JDM and MRM accurately describe the diffusion of bulk water observed by QENS at all length scales, and confirm that MD simulations do not fully describe the quantum effects of jump diffusion.
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Domenici F, Guazzelli E, Masotti E, Mahmoudi N, Gabrielli S, Telling MTF, Martinelli E, Galli G, Paradossi G. Understanding the Temperature‐Responsive Self‐Assemblies of Amphiphilic Random Copolymers by SANS in D
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O Solution. MACROMOL CHEM PHYS 2021. [DOI: 10.1002/macp.202170009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Domenici F, Guazzelli E, Masotti E, Mahmoudi N, Gabrielli S, Telling MTF, Martinelli E, Galli G, Paradossi G. Understanding the Temperature‐Responsive Self‐Assemblies of Amphiphilic Random Copolymers by SANS in D
2
O Solution. MACROMOL CHEM PHYS 2021. [DOI: 10.1002/macp.202000447] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Fabio Domenici
- Department of Chemical Sciences and Technologies University of Rome Tor Vergata and INFN Viale della ricerca scientifica Rome 00133 Italy
| | - Elisa Guazzelli
- Department of Chemistry and Industrial Chemistry University of Pisa Via G Moruzzi 13 Pisa 56124 Italy
| | - Elena Masotti
- Department of Chemistry and Industrial Chemistry University of Pisa Via G Moruzzi 13 Pisa 56124 Italy
| | - Najet Mahmoudi
- ISIS Neutron and Muon Spallation Source STFC Rutherford Appleton Laboratory Chilton OX11 0QX UK
| | - Sara Gabrielli
- Department of Chemical Sciences and Technologies University of Rome Tor Vergata and INFN Viale della ricerca scientifica Rome 00133 Italy
| | - Mark T. F. Telling
- ISIS Neutron and Muon Spallation Source STFC Rutherford Appleton Laboratory Chilton OX11 0QX UK
| | - Elisa Martinelli
- Department of Chemistry and Industrial Chemistry University of Pisa Via G Moruzzi 13 Pisa 56124 Italy
| | - Giancarlo Galli
- Department of Chemistry and Industrial Chemistry University of Pisa Via G Moruzzi 13 Pisa 56124 Italy
| | - Gaio Paradossi
- Department of Chemical Sciences and Technologies University of Rome Tor Vergata and INFN Viale della ricerca scientifica Rome 00133 Italy
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Kundu S, Shahee A, Chakraborty A, Ranjith KM, Koo B, Sichelschmidt J, Telling MTF, Biswas PK, Baenitz M, Dasgupta I, Pujari S, Mahajan AV. Gapless Quantum Spin Liquid in the Triangular System Sr_{3}CuSb_{2}O_{9}. Phys Rev Lett 2020; 125:267202. [PMID: 33449718 DOI: 10.1103/physrevlett.125.267202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2020] [Accepted: 12/01/2020] [Indexed: 06/12/2023]
Abstract
We report gapless quantum spin liquid behavior in the layered triangular Sr_{3}CuSb_{2}O_{9} system. X-ray diffraction shows superlattice reflections associated with atomic site ordering into triangular Cu planes well separated by Sb planes. Muon spin relaxation measurements show that the S=1/2 moments at the magnetically active Cu sites remain dynamic down to 65 mK in spite of a large antiferromagnetic exchange scale evidenced by a large Curie-Weiss temperature θ_{CW}≃-143 K as extracted from the bulk susceptibility. Specific heat measurements also show no sign of long-range order down to 0.35 K. The magnetic specific heat (C_{m}) below 5 K reveals a C_{m}=γT+αT^{2} behavior. The significant T^{2} contribution to the magnetic specific heat invites a phenomenology in terms of the so-called Dirac spinon excitations with a linear dispersion. From the low-T specific heat data, we estimate the dominant exchange scale to be ∼36 K using a Dirac spin liquid ansatz which is not far from the values inferred from microscopic density functional theory calculations (∼45 K) as well as high-temperature susceptibility analysis (∼70 K). The linear specific heat coefficient is about 18 mJ/mol K^{2} which is somewhat larger than for typical Fermi liquids.
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Affiliation(s)
- S Kundu
- Department of Physics, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Aga Shahee
- Department of Physics, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Atasi Chakraborty
- School of Physical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - K M Ranjith
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | - B Koo
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | - Jörg Sichelschmidt
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | - Mark T F Telling
- ISIS Pulsed Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Harwell Campus, Didcot, Oxfordshire OX110QX, United Kingdom
| | - P K Biswas
- ISIS Pulsed Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Harwell Campus, Didcot, Oxfordshire OX110QX, United Kingdom
| | - M Baenitz
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | - I Dasgupta
- School of Physical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Sumiran Pujari
- Department of Physics, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - A V Mahajan
- Department of Physics, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
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Lima RJS, Okhrimenko DV, Rudić S, Telling MTF, Sakai VG, Hwang D, Barin G, Eckert J, Lee JW, Bordallo HN. Ammonia Storage in Hydrogen Bond-Rich Microporous Polymers. ACS Appl Mater Interfaces 2020; 12:58161-58169. [PMID: 33326228 DOI: 10.1021/acsami.0c18855] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The fascinating structural flexibility of porous polymers is highly attractive because it can result in optimized materials with specific host-guest interactions. Nevertheless, the fundamental mechanisms responsible for controlling the weak interactions of these hydrogen bond-rich networks-essential for developing smart task-specific materials used in recognition, capture, and sequestration processes-remain unexplored. Herein, by systematically comparing performance changes between poly(amic acid) (PAA)- and polycyclic imide (PI)-based porous polymers before and after NH3 adsorption, the role of hydrogen bonds in conformational lability and responsiveness toward guest molecules is highlighted. By combining thermal gravimetric analysis with neutron spectroscopy supported by DFT calculations, we demonstrate that PAA's chemical and physical stability is enhanced by the presence of stronger host-guest interactions. This observation also emphasizes the idea that efficient adsorption relies on having a high number of sites, upon which gas molecules can adsorb with greater affinity via strong hydrogen bonding interactions.
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Affiliation(s)
- Rodrigo J S Lima
- Academic Unit of Physics, Universidade Federal de Campina Grande, 58429-900 Campina Grande, Paraíba, Brazil
- The Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen, Denmark
| | - Denis V Okhrimenko
- Department of Chemistry, University of Copenhagen, DK-2100 Copenhagen, Denmark
| | - Svemir Rudić
- ISIS Facility, Rutherford Appleton Laboratory, Chilton, Oxon OX11 0QX, U.K
| | - Mark T F Telling
- ISIS Facility, Rutherford Appleton Laboratory, Chilton, Oxon OX11 0QX, U.K
- Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, U.K
| | | | - Dasol Hwang
- Department of Chemistry, University of Copenhagen, DK-2100 Copenhagen, Denmark
| | - Gokhan Barin
- Department of Chemistry, University of California, Berkeley, California 94720-1460, United States
| | - Juergen Eckert
- Department of Chemistry and Biochemistry, Texas Tech, Lubbock, Texas 79409-1061, United States
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Ji-Woong Lee
- Department of Chemistry, University of Copenhagen, DK-2100 Copenhagen, Denmark
- Nano-Science Center, Department of Chemistry, University of Copenhagen, DK-2100 Copenhagen, Denmark
| | - Heloisa N Bordallo
- The Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen, Denmark
- European Spallation Source ESS ERIC, P.O. Box 176, SE-221 00 Lund, Sweden
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7
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Tustain K, Farrar L, Yao W, Lightfoot P, da Silva I, Telling MTF, Clark L. Materialization of a Geometrically Frustrated Magnet in a Hybrid Coordination Framework: A Study of the Iron(II) Oxalate Fluoride Framework, KFe(C2O4)F. Inorg Chem 2019; 58:11971-11977. [DOI: 10.1021/acs.inorgchem.9b00571] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Katherine Tustain
- Department of Chemistry and Materials Innovation Factory, University of Liverpool, 51 Oxford Street, Liverpool L7 3NY, U.K
| | - Lewis Farrar
- Department of Chemistry and Materials Innovation Factory, University of Liverpool, 51 Oxford Street, Liverpool L7 3NY, U.K
| | - Wenjiao Yao
- School of Chemistry, University of St. Andrews, St. Andrews, Fife KY16 9ST, U.K
| | - Philip Lightfoot
- School of Chemistry, University of St. Andrews, St. Andrews, Fife KY16 9ST, U.K
| | - Ivan da Silva
- ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxford OX11 0QX, U.K
| | - Mark T. F. Telling
- ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxford OX11 0QX, U.K
| | - Lucy Clark
- Department of Chemistry and Materials Innovation Factory, University of Liverpool, 51 Oxford Street, Liverpool L7 3NY, U.K
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8
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Zeller D, Telling MTF, Zamponi M, García Sakai V, Peters J. Analysis of elastic incoherent neutron scattering data beyond the Gaussian approximation. J Chem Phys 2018; 149:234908. [PMID: 30579322 DOI: 10.1063/1.5049938] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
This work addresses the use of the Gaussian approximation as a common tool to extract atomic motions in proteins from elastic incoherent neutron scattering and whether improvements in data analysis and additional information can be obtained when going beyond that. We measured alpha-lactalbumin with different levels of hydration on three neutron backscattering spectrometers, to be able to resolve a wide temporal and spatial range for dynamics. We demonstrate that the Gaussian approximation gives qualitatively similar results to models that include heterogeneity, if one respects a certain procedure to treat the intercept of the elastic intensities with the momentum transfer axis. However, the inclusion of motional heterogeneity provides better fits to the data. Our analysis suggests an approach of limited heterogeneity, where including only two kinds of motions appears sufficient to obtain more quantitative results for the mean square displacement. Finally, we note that traditional backscattering spectrometers pose a limit on the lowest accessible momentum transfer. We therefore suggest that complementary information about the spatial evolution of the elastic intensity close to zero momentum transfer can be obtained using other neutron methods, in particular, neutron spin-echo together with polarization analysis.
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Affiliation(s)
- D Zeller
- Université Grenoble Alpes, CNRS, LiPhy, 140 av. de la Physique, 38000 Grenoble, France
| | - M T F Telling
- ISIS Pulsed Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Chilton, Oxfordshire OX11 0QX, United Kingdom
| | - M Zamponi
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Lichtenbergstr. 1, 85748 Garching, Germany
| | - V García Sakai
- ISIS Pulsed Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Chilton, Oxfordshire OX11 0QX, United Kingdom
| | - J Peters
- Université Grenoble Alpes, CNRS, LiPhy, 140 av. de la Physique, 38000 Grenoble, France
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9
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Arrighi V, Gagliardi S, Ganazzoli F, Higgins JS, Raffaini G, Tanchawanich J, Taylor J, Telling MTF. Effect of Chain Length and Topological Constraints on Segmental Relaxation in Cyclic PDMS. Macromolecules 2018. [DOI: 10.1021/acs.macromol.8b00397] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Valeria Arrighi
- Institute of Chemical Sciences, School of Engineering and Physical Science, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom
| | - Simona Gagliardi
- Institute of Chemical Sciences, School of Engineering and Physical Science, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom
| | - Fabio Ganazzoli
- Dipartimento di Chimica, Materiali e Ingegneria Chimica “Giulio Natta”, Politecnico di Milano, via L. Mancinelli 7, 20131 Milano, Italy
| | - Julia S. Higgins
- Chemical Engineering Department, Imperial College London, South Kensington
Campus, London SW7 2AZ, United Kingdom
| | - Giuseppina Raffaini
- Dipartimento di Chimica, Materiali e Ingegneria Chimica “Giulio Natta”, Politecnico di Milano, via L. Mancinelli 7, 20131 Milano, Italy
| | - Jeerachada Tanchawanich
- Institute of Chemical Sciences, School of Engineering and Physical Science, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom
| | - Jenny Taylor
- Institute of Chemical Sciences, School of Engineering and Physical Science, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom
| | - Mark T. F. Telling
- ISIS, Rutherford
Appleton Laboratory, Chilton, Didcot OX11 OQX, United Kingdom
- Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, United Kingdom
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10
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Martinelli E, Guazzelli E, Galli G, Telling MTF, Poggetto GD, Immirzi B, Domenici F, Paradossi G. Prolate and Temperature-Responsive Self-Assemblies of Amphiphilic Random Copolymers with Perfluoroalkyl and Polyoxyethylene Side Chains in Solution. MACROMOL CHEM PHYS 2018. [DOI: 10.1002/macp.201800210] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Elisa Martinelli
- Dipartimento di Chimica e Chimica Industriale; Università di Pisa; 56124 Pisa Italy
| | - Elisa Guazzelli
- Dipartimento di Chimica e Chimica Industriale; Università di Pisa; 56124 Pisa Italy
| | - Giancarlo Galli
- Dipartimento di Chimica e Chimica Industriale; Università di Pisa; 56124 Pisa Italy
| | - Mark T. F. Telling
- STFC Rutherford Appleton Laboratory; Chilton OX11 0QX UK
- Department of Materials; University of Oxford; Parks Road Oxford UK
| | | | - Barbara Immirzi
- Istituto per i Polimeri Compositi e Biomateriali; CNR; 80078 Pozzuoli Italy
| | - Fabio Domenici
- Dipartimento di Scienze e Tecnologie Chimiche; Università di Roma Tor Vergata; 000133 Roma Italy
| | - Gaio Paradossi
- Dipartimento di Scienze e Tecnologie Chimiche; Università di Roma Tor Vergata; 000133 Roma Italy
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Berg MC, Benetti AR, Telling MTF, Seydel T, Yu D, Daemen LL, Bordallo HN. Nanoscale Mobility of Aqueous Polyacrylic Acid in Dental Restorative Cements. ACS Appl Mater Interfaces 2018; 10:9904-9915. [PMID: 29504390 DOI: 10.1021/acsami.7b15735] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Hydrogen dynamics in a time range from hundreds of femtoseconds to nanoseconds can be directly analyzed using neutron spectroscopy, where information on the inelastic and quasi-elastic scattering, hereafter INS and QENS, can be obtained. In this study, we applied these techniques to understand how the nanoscale mobility of the aqueous solution of polyacrylic acid (PAA) used in conventional glass ionomer cements (GICs) changes under confinement. Combining the spectroscopic analysis with calorimetric results, we were able to separate distinct motions within both the liquid and the GICs. The QENS analysis revealed that the self-diffusion translational motion identified in the liquid is also visible in the GIC. However, as a result of the formation of the cement matrix and its setting, both translational diffusion and residence time differed from the PAA solution. When comparing the local diffusion obtained for the selected GIC, the only noticeable difference was observed for the slow dynamics associated with the polymer chain. Additionally, over short-term aging, progressive water binding to the polymer chain occurred in one of the investigated GICs. Finally, a considerable change in the density of the GIC without progressive water binding indicates an increased polymer cross-linking. Taken together, our results suggest that accurate and deep understanding of polymer-water binding, polymer cross-linking, as well as material density changes occurring during the maturation process of GIC are necessary for the development of advanced dental restorative materials.
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Affiliation(s)
- Marcella C Berg
- The Niels Bohr Institute , University of Copenhagen , DK-2100 Copenhagen , Denmark
- European Spallation Source ESS ERIC , P.O. Box 176 , SE-221 00 Lund , Sweden
| | - Ana R Benetti
- Department of Odontology, Faculty of Health and Medical Sciences , University of Copenhagen , DK-2200 Copenhagen , Denmark
| | - Mark T F Telling
- ISIS Facility , Rutherford Appleton Laboratory , Chilton, Oxford OX11 0QX , U.K
- Department of Materials , University of Oxford , Parks Road , Oxford OX1 3PH , U.K
| | - Tilo Seydel
- Institut Max von Laue-Paul Langevin , CS 20156 , F-38042 Grenoble , France
| | - Dehong Yu
- Australian Nuclear Science and Technology Organisation , New Illawarra Road , Lucas Heights , New South Wales 2234 , Australia
| | - Luke L Daemen
- Oak Ridge National Laboratory , P.O. Box 2008 , Oak Ridge , Tennessee 37831 , United States
| | - Heloisa N Bordallo
- The Niels Bohr Institute , University of Copenhagen , DK-2100 Copenhagen , Denmark
- European Spallation Source ESS ERIC , P.O. Box 176 , SE-221 00 Lund , Sweden
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Magazù S, Migliardo F, Telling MTF. Comments on: Study of the dynamical properties of water in disaccharide solutions. Eur Biophys J 2016; 45:377. [PMID: 27015817 DOI: 10.1007/s00249-016-1123-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
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Telling MTF, Campbell SI, Engberg D, Martín Y Marero D, Andersen KH. Correction: Spectroscopic characteristics of the OSIRIS near-backscattering crystal analyser spectrometer on the ISIS pulsed neutron source. Phys Chem Chem Phys 2016; 18:8243. [PMID: 26905035 DOI: 10.1039/c6cp90057g] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Correction for 'Spectroscopic characteristics of the OSIRIS near-backscattering crystal analyser spectrometer on the ISIS pulsed neutron source' by Mark T. F. Telling et al., Phys. Chem. Chem. Phys., 2005, 7, 1255-1261.
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Affiliation(s)
- Mark T F Telling
- ISIS Facility, Rutherford Appleton Laboratory, Chilton, Oxon, UKOX11 0QX.
| | - Stuart I Campbell
- ISIS Facility, Rutherford Appleton Laboratory, Chilton, Oxon, UKOX11 0QX.
| | - Dennis Engberg
- ISIS Facility, Rutherford Appleton Laboratory, Chilton, Oxon, UKOX11 0QX.
| | - David Martín Y Marero
- Departamento de Física Aplicada, Facultad de Ciencias, Universidad Autónoma de Madrid, 28049 Madrid, Spain and Fundación Parque Científico de Madrid, Campus de Cantoblanco, 28049 Madrid, Spain and Centro de Microanálisis de Materiales & Instituto Nicolás Cabrera, Universidad Autónoma de Madrid, 28049 Madrid, Spain
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Christien F, Telling MTF, Knight KS, Le Gall R. A method for the monitoring of metal recrystallization based on the in-situ measurement of the elastic energy release using neutron diffraction. Rev Sci Instrum 2015; 86:053901. [PMID: 26026530 DOI: 10.1063/1.4919414] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A method is proposed for the monitoring of metal recrystallization using neutron diffraction that is based on the measurement of stored energy. Experiments were performed using deformed metal specimens heated in-situ while mounted at the sample position of the High Resolution Powder Diffractometer, HRPD (ISIS Facility), UK. Monitoring the breadth of the resulting Bragg lines during heating not only allows the time-dependence (or temperature-dependence) of the stored energy to be determined but also the recrystallized fraction. The analysis method presented here was developed using pure nickel (Ni270) specimens with different deformation levels from 0.29 to 0.94. In situ temperature ramping as well as isothermal annealing was undertaken. The method developed in this work allows accurate and quantitative monitoring of the recrystallization process. The results from neutron diffraction are satisfactorily compared to data obtained from calorimetry and hardness measurements.
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Affiliation(s)
- F Christien
- Institut des Matériaux Jean Rouxel (IMN), Université de Nantes, CNRS, Rue Christian Pauc, BP 50609, 44306 Nantes Cedex 3, France
| | - M T F Telling
- ISIS Facility, Rutherford Appleton Laboratory, Chilton OX11 0QX, United Kingdom
| | - K S Knight
- ISIS Facility, Rutherford Appleton Laboratory, Chilton OX11 0QX, United Kingdom
| | - R Le Gall
- Institut des Matériaux Jean Rouxel (IMN), Université de Nantes, CNRS, Rue Christian Pauc, BP 50609, 44306 Nantes Cedex 3, France
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Dattani R, Telling MTF, Lopez CG, Krishnadasan SH, Bannock JH, Terry AE, de Mello JC, Cabral JT, Nedoma AJ. Rapid Precipitation: An Alternative to Solvent Casting for Organic Solar Cells. Chemphyschem 2015; 16:1231-8. [DOI: 10.1002/cphc.201402758] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2014] [Indexed: 11/10/2022]
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Jacobsen J, Rodrigues MS, Telling MTF, Beraldo AL, Santos SF, Aldridge LP, Bordallo HN. Nano-scale hydrogen-bond network improves the durability of greener cements. Sci Rep 2014; 3:2667. [PMID: 24036676 PMCID: PMC3773627 DOI: 10.1038/srep02667] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2013] [Accepted: 08/30/2013] [Indexed: 11/26/2022] Open
Abstract
More than ever before, the world's increasing need for new infrastructure demands the construction of efficient, sustainable and durable buildings, requiring minimal climate-changing gas-generation in their production. Maintenance-free “greener” building materials made from blended cements have advantages over ordinary Portland cements, as they are cheaper, generate less carbon dioxide and are more durable. The key for the improved performance of blends (which substitute fine amorphous silicates for cement) is related to their resistance to water penetration. The mechanism of this water resistance is of great environmental and economical impact but is not yet understood due to the complexity of the cement's hydration reactions. Using neutron spectroscopy, we studied a blend where cement was replaced by ash from sugar cane residuals originating from agricultural waste. Our findings demonstrate that the development of a distinctive hydrogen bond network at the nano-scale is the key to the performance of these greener materials.
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Affiliation(s)
- Johan Jacobsen
- 1] The Niels Bohr Institute, University of Copenhagen, DK-2100, Copenhagen, Denmark [2] European Spallation Source ESS AB P.O Box 176, SE-221 00 Lund, Sweden [3]
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17
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Ghugare SV, Chiessi E, Sakai VG, Telling MTF, Wadgaonkar PP, Paradossi G. Thermoresponsive and Biodegradable Dextran Based Microgels: Synthesis and Structural Investigation. ACTA ACUST UNITED AC 2013. [DOI: 10.1002/masy.201300009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Shivkumar V. Ghugare
- Dipartimento di Scienze e Tecnologie Chimiche; Università di Roma Tor Vergata; 00133; Roma; Italy
| | - Ester Chiessi
- Dipartimento di Scienze e Tecnologie Chimiche; Università di Roma Tor Vergata; 00133; Roma; Italy
| | | | | | - Prakash P. Wadgaonkar
- Polymer Science and Engineering Division; National Chemical Laboratory; Pune; 411008; India
| | - Gaio Paradossi
- Dipartimento di Scienze e Tecnologie Chimiche; Università di Roma Tor Vergata; 00133; Roma; Italy
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18
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Clark L, Orain JC, Bert F, De Vries MA, Aidoudi FH, Morris RE, Lightfoot P, Lord JS, Telling MTF, Bonville P, Attfield JP, Mendels P, Harrison A. Gapless spin liquid ground state in the S = 1/2 vanadium oxyfluoride kagome antiferromagnet [NH4]2[C7H14N][V7O6F18]. Phys Rev Lett 2013; 110:207208. [PMID: 25167449 DOI: 10.1103/physrevlett.110.207208] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2013] [Indexed: 06/03/2023]
Abstract
The vanadium oxyfluoride [NH(4)](2)[C(7)H(14)N][V(7)O(6)F(18)] (DQVOF) is a geometrically frustrated magnetic bilayer material. The structure consists of S = 1/2 kagome planes of V(4+) d(1) ions with S = 1 V(3+) d(2) ions located between the kagome layers. Muon spin relaxation measurements demonstrate the absence of spin freezing down to 40 mK despite an energy scale of 60 K for antiferromagnetic exchange interactions. From magnetization and heat capacity measurements we conclude that the S = 1 spins of the interplane V(3+) ions are weakly coupled to the kagome layers, such that DQVOF can be viewed as an experimental model for S = 1/2 kagome physics, and that it displays a gapless spin liquid ground state.
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Affiliation(s)
- L Clark
- CSEC and School of Chemistry, The University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
| | - J C Orain
- Laboratoire de Physique des Solides, UMR CNRS, Université Paris-Sud, 91504 Orsay, France
| | - F Bert
- Laboratoire de Physique des Solides, UMR CNRS, Université Paris-Sud, 91504 Orsay, France
| | - M A De Vries
- CSEC and School of Chemistry, The University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
| | - F H Aidoudi
- School of Chemistry and EaSTChem, University of St. Andrews, St. Andrews KY16 9ST, United Kingdom
| | - R E Morris
- School of Chemistry and EaSTChem, University of St. Andrews, St. Andrews KY16 9ST, United Kingdom
| | - P Lightfoot
- School of Chemistry and EaSTChem, University of St. Andrews, St. Andrews KY16 9ST, United Kingdom
| | - J S Lord
- ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX110QX, United Kingdom
| | - M T F Telling
- ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX110QX, United Kingdom and Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, United Kingdom
| | - P Bonville
- Service de Physique de l'État Condensé, CEA-CNRS, CE-Saclay, F-91191 Gif-Sur-Yvette, France
| | - J P Attfield
- CSEC and School of Chemistry, The University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
| | - P Mendels
- Laboratoire de Physique des Solides, UMR CNRS, Université Paris-Sud, 91504 Orsay, France and Institut Universitaire de France, 103 bd Saint Michel, F-75005 Paris, France
| | - A Harrison
- CSEC and School of Chemistry, The University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom and Institut Laue Langevin, 6 Rue Jules Horowitz, 38042 Grenoble Cedex 9, France
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19
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Lapidus SH, Manson JL, Park H, Clement AJ, Ghannadzadeh S, Goddard P, Lancaster T, Möller JS, Blundell SJ, Telling MTF, Kang J, Whangbo MH, Schlueter JA. Antiferromagnetic ordering through a hydrogen-bonded network in the molecular solid CuF2(H2O)2(3-chloropyridine). Chem Commun (Camb) 2013. [PMID: 23203152 DOI: 10.1039/c2cc37444g] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Saul H Lapidus
- Materials Science Division, Argonne National Laboratory, Argonne, IL 60439, USA
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20
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Arrighi V, Tanchawanich J, Telling MTF. Molar Mass Dependence of Polyethylene Chain Dynamics. A Quasi-Elastic Neutron Scattering Investigation. Macromolecules 2012. [DOI: 10.1021/ma301922j] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- V. Arrighi
- Chemistry, School of Engineering and Physical Science, Heriot-Watt University, Edinburgh, U.K
| | - J. Tanchawanich
- Chemistry, School of Engineering and Physical Science, Heriot-Watt University, Edinburgh, U.K
| | - Mark T. F. Telling
- ISIS, Rutherford Appleton Laboratory, Chilton, Didcot OX11 OQX, U.K
- Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, U.K
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21
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Bull DJ, Sorbie N, Baldissin G, Moser D, Telling MTF, Smith RI, Gregory DH, Ross DK. In situ powder neutron diffraction study of non-stoichiometric phase formation during the hydrogenation of Li3N. Faraday Discuss 2011; 151:263-70; discussion 285-95. [PMID: 22455074 DOI: 10.1039/c0fd00020e] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The hydrogenation of Li3N at low chemical potential has been studied in situ by time-of-flight powder neutron diffraction and the formation of a non-stoichiometric Li4-2xNH phase and Li4NH observed. The results are interpreted in terms of a model for the reaction pathway involving the production of Li4NH and Li2NH, which subsequently react together to form Li4-2xNH. Possible mechanisms for the production of Li4NH from the hydrogenation of Li3N are discussed.
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Affiliation(s)
- Daniel J Bull
- Materials and Physics Research Centre, University of Salford, Salford, Greater Manchester, M5 4WT, UK.
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22
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Pelley C, Kargl F, Sakai VG, Telling MTF, Fernandez-Alonso F, Demmel F. Guide design study for the high-resolution backscattering spectrometer FIRES. ACTA ACUST UNITED AC 2010. [DOI: 10.1088/1742-6596/251/1/012063] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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23
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Ghugare SV, Chiessi E, Telling MTF, Deriu A, Gerelli Y, Wuttke J, Paradossi G. Structure and Dynamics of a Thermoresponsive Microgel around Its Volume Phase Transition Temperature. J Phys Chem B 2010; 114:10285-93. [DOI: 10.1021/jp100962p] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Shivkumar V. Ghugare
- Dipartimento di Scienze e Tecnologie Chimiche, Università di Roma Tor Vergata and SOFT, CNR-INFM, Rome, Italy; ISIS Facility, Rutherford Appleton Laboratory, Chilton Didcot, Oxfordshire OX11 0QX, U.K.; Dipartimento di Fisica, Università di Parma, Parma, Italy; and JCNS at FRM II, Forschungszentrum Jülich, 85747 Garching, Germany
| | - Ester Chiessi
- Dipartimento di Scienze e Tecnologie Chimiche, Università di Roma Tor Vergata and SOFT, CNR-INFM, Rome, Italy; ISIS Facility, Rutherford Appleton Laboratory, Chilton Didcot, Oxfordshire OX11 0QX, U.K.; Dipartimento di Fisica, Università di Parma, Parma, Italy; and JCNS at FRM II, Forschungszentrum Jülich, 85747 Garching, Germany
| | - Mark T. F. Telling
- Dipartimento di Scienze e Tecnologie Chimiche, Università di Roma Tor Vergata and SOFT, CNR-INFM, Rome, Italy; ISIS Facility, Rutherford Appleton Laboratory, Chilton Didcot, Oxfordshire OX11 0QX, U.K.; Dipartimento di Fisica, Università di Parma, Parma, Italy; and JCNS at FRM II, Forschungszentrum Jülich, 85747 Garching, Germany
| | - Antonio Deriu
- Dipartimento di Scienze e Tecnologie Chimiche, Università di Roma Tor Vergata and SOFT, CNR-INFM, Rome, Italy; ISIS Facility, Rutherford Appleton Laboratory, Chilton Didcot, Oxfordshire OX11 0QX, U.K.; Dipartimento di Fisica, Università di Parma, Parma, Italy; and JCNS at FRM II, Forschungszentrum Jülich, 85747 Garching, Germany
| | - Yuri Gerelli
- Dipartimento di Scienze e Tecnologie Chimiche, Università di Roma Tor Vergata and SOFT, CNR-INFM, Rome, Italy; ISIS Facility, Rutherford Appleton Laboratory, Chilton Didcot, Oxfordshire OX11 0QX, U.K.; Dipartimento di Fisica, Università di Parma, Parma, Italy; and JCNS at FRM II, Forschungszentrum Jülich, 85747 Garching, Germany
| | - Joachim Wuttke
- Dipartimento di Scienze e Tecnologie Chimiche, Università di Roma Tor Vergata and SOFT, CNR-INFM, Rome, Italy; ISIS Facility, Rutherford Appleton Laboratory, Chilton Didcot, Oxfordshire OX11 0QX, U.K.; Dipartimento di Fisica, Università di Parma, Parma, Italy; and JCNS at FRM II, Forschungszentrum Jülich, 85747 Garching, Germany
| | - Gaio Paradossi
- Dipartimento di Scienze e Tecnologie Chimiche, Università di Roma Tor Vergata and SOFT, CNR-INFM, Rome, Italy; ISIS Facility, Rutherford Appleton Laboratory, Chilton Didcot, Oxfordshire OX11 0QX, U.K.; Dipartimento di Fisica, Università di Parma, Parma, Italy; and JCNS at FRM II, Forschungszentrum Jülich, 85747 Garching, Germany
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24
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Barbour AM, Telling MTF, Larese JZ. Investigation of the behavior of ethylene molecular films using high resolution adsorption isotherms and neutron scattering. Langmuir 2010; 26:8113-8121. [PMID: 20180572 DOI: 10.1021/la9044368] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The wetting behavior of ethylene adsorbed on MgO(100) was investigated from 83-135 K using high resolution volumetric adsorption isotherms. The results are compared to ethylene adsorption on graphite, a prototype adsorption system, in an effort to gain further insight into the forces that drive the observed film growth. Layering transitions for ethylene on MgO(100) are observed below the bulk triple point of ethylene (T = 104.0 K). The formation of three discrete adlayers is observed on the MgO(100) surface; onset of the second and third layers occurs at 79.2 +/- 1.3 K and 98.3 +/- 0.9 K, respectively. Thermodynamic quantities such as differential enthalpy and entropy, heat of adsorption, and isosteric heat of adsorption are determined and compared to the previously published values for ethylene on graphite. The average area occupied by a ethylene molecule on MgO(100) is 22.6 +/- 1.1 A2 molecule(-1). The locations of two phase transitions are identified (i.e., layer critical temperatures at T(c2)(n=1) at 108.6 +/- 1.7 K and T(c2)(n=2) at 116.5 +/- 1.2 K) and a phase diagram is proposed. Preliminary neutron diffraction measurements reveal evidence of a monolayer solid with a lattice constant of approximately 4.2 A. High resolution INS measurements show that the onset to dynamical motion and monolayer melting take place at approximately 35 K and approximately 65 K, respectively. The data reported here exhibit a striking similarity to ethylene on graphite which suggests that molecule-molecule interactions play an important role in determining the physical properties and growth of molecularly thin ethylene films.
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Affiliation(s)
- Andi M Barbour
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, USA
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25
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Bull DJ, Weidner E, Shabalin IL, Telling MTF, Jewell CM, Gregory DH, Ross DK. Pressure-dependent deuterium reaction pathways in the Li–N–D system. Phys Chem Chem Phys 2010; 12:2089-97. [DOI: 10.1039/b903821n] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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26
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Telling MTF, Campbell SI, Engberg D, Marero DMY, Andersen KH. Spectroscopic characteristics of the OSIRIS near-backscattering crystal analyser spectrometer on the ISIS pulsed neutron source. Phys Chem Chem Phys 2009; 7:1255-61. [PMID: 19791342 DOI: 10.1039/b413934h] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The OSIRIS neutron instrument on the ISIS pulsed source now affords the option of high-resolution quasi-elastic and inelastic neutron spectroscopy. In this paper, the performance of OSIRIS is presented, with the spectroscopic characteristics of the instrument being discussed in terms of energy resolution, signal to background ratio and neutron count rate. Recent improvements to the spectrometer are described, in particular the effect of cooling the crystal analysers close to liquid helium temperature to enhance the sensitivity of the instrument. The performance of OSIRIS is also likened to back-scattering, crystal analyser spectrometers at other neutron sources.
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Affiliation(s)
- Mark T F Telling
- ISIS Facility, Rutherford Appleton Laboratory, Chilton, Oxon, UK OX11 0QX.
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27
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Varga B, Migliardo F, Takacs E, Vertessy B, Magazù S, Telling MTF. Study of solvent-protein coupling effects by neutron scattering. J Biol Phys 2009; 36:207-20. [PMID: 19795216 DOI: 10.1007/s10867-009-9177-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2009] [Accepted: 09/09/2009] [Indexed: 11/30/2022] Open
Abstract
The present work aims to characterize the dynamical behavior of proteins immersed in bio-preserving liquids and glasses. For this purpose, the protein dUTPase was chosen, while the selected solvents were glycerol, a triol, and some homologous disaccharides, i.e., trehalose, maltose, and sucrose, which are known to be very effective bio-preserving agents. The results highlight that the disaccharides show a slowing down effect on the water dynamics, which is stronger for trehalose than in the case of the other disaccharides. Furthermore, a characterization of the medium which hosts the protein is performed by using an operative definition of fragility based on the mean square displacement extracted by elastic incoherent neutron scattering, which is directly connected to Angell's kinetic fragility based on the viscosity. Finally, a study of the dynamics of the protein sequestered within the solvents is performed. The result shows that the protein dynamics is coupled with that of the surrounding matrix.
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28
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Inoue R, Kanaya T, Nishida K, Tsukushi I, Telling MTF, Gabrys BJ, Tyagi M, Soles C, Wu WL. Glass transition and molecular mobility in polymer thin films. Phys Rev E Stat Nonlin Soft Matter Phys 2009; 80:031802. [PMID: 19905138 DOI: 10.1103/physreve.80.031802] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2009] [Indexed: 05/28/2023]
Abstract
Extensive studies on polymer thin films to date have revealed their interesting but unusual properties such as film thickness dependence of glass transition temperature Tg and thermal expansivity. Recent studies have shown that the lower Tg is not always related to the higher mobility in polymer thin films, which contradicts our current understanding of the glass transition process. In this work, we report the results of inelastic neutron-scattering measurements on polystyrene thin films using two spectrometers with different energy resolutions as well as ellipsometry measurements. The results are interpreted in terms of cooperatively rearranging region and motional slowing down due to the surface effect that explain plausibly the anomalous relationship between the glass transition temperature Tg and the molecular mobility in thin films.
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Affiliation(s)
- R Inoue
- Institute for Chemical Research, Kyoto University, Uji, Kyoto-fu 611-0011, Japan
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29
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Affiliation(s)
- Jeerachada Tanchawanich
- Chemistry, School of Engineering and Physical Science, Heriot-Watt University, Edinburgh EH14 4AS, UK
| | - Valeria Arrighi
- Chemistry, School of Engineering and Physical Science, Heriot-Watt University, Edinburgh EH14 4AS, UK
| | | | | | - Alessandro Triolo
- Istituto Processi Chimico-Fisici, Sezione di Messina-CNR, Messina, Italy
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30
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Magazù S, Romeo G, Telling MTF. Temperature dependence of protein dynamics as affected by sugars: a neutron scattering study. Eur Biophys J 2007; 36:685-91. [PMID: 17657485 DOI: 10.1007/s00249-007-0190-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2007] [Revised: 04/29/2007] [Accepted: 05/07/2007] [Indexed: 10/23/2022]
Abstract
Neutron scattering data on lysozyme-trehalose and lysozyme-sucrose aqueous mixtures, and on trehalose and sucrose aqueous mixtures are presented for a wide temperature range. Although the degree of protein coupling to solvent seems to be an open question in the literature, we present evidence that seems to be a firm link between a local dynamics of the protein with that of the glassy host. One of the objectives of this study was to explore the relationship between protein dynamics and glassy host. Measuring the <u(2)> of lysozyme mixtures, we arrive at a qualitative description of how their thermal stability is affected by the presence of two sugars at different temperatures. Whereas the Q dependence of the elastic incoherent structure factor gives information about the geometry and the amplitudes of the motions.
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Affiliation(s)
- S Magazù
- Physics Department and INFM, Messina University, Messina, Italy
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31
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Haravifard S, Dunsiger SR, El Shawish S, Gaulin BD, Dabkowska HA, Telling MTF, Perring TG, Bonca J. In-gap spin excitations and finite triplet lifetimes in the dilute singlet ground state system SrCu(2-x)Mgx(BO3)2. Phys Rev Lett 2006; 97:247206. [PMID: 17280317 DOI: 10.1103/physrevlett.97.247206] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2006] [Indexed: 05/13/2023]
Abstract
High resolution neutron scattering measurements on a single crystal of SrCu(2-x)Mgx(BO3)2 with x approximately 0.05 reveal the presence of new spin excitations within the gap of this quasi-two-dimensional, singlet ground state system. The application of a magnetic field induces Zeeman-split states associated with S=1/2 unpaired spins which are antiferromagnetically correlated with the bulk singlet. Substantial broadening of both the one- and two-triplet excitations in the doped single crystal is observed, as compared with pure SrCu2(BO3)2. Theoretical calculations using a variational algorithm and a single quenched magnetic vacancy on an infinite lattice are shown to qualitatively account for these effects.
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Affiliation(s)
- S Haravifard
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1, Canada
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32
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Magazù S, Migliardo F, Telling MTF. Study of the dynamical properties of water in disaccharide solutions. Eur Biophys J 2006; 36:163-71. [PMID: 17109123 DOI: 10.1007/s00249-006-0108-0] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2006] [Revised: 09/22/2006] [Accepted: 10/10/2006] [Indexed: 10/23/2022]
Abstract
This work presents quasi-elastic neutron scattering (QENS) and neutron spin echo (NSE) findings on homologous disaccharide (i.e. trehalose, maltose and sucrose)/water solutions as a function of temperature. The dynamical properties of these systems are investigated by QENS, which, on the picosecond scale, allows for the characterisation of the diffusion of both solutes and solvent. On the other hand, NSE investigates the dynamics on the nanosecond scale, allowing for the relaxation times of the disaccharide/water systems to be evaluated. The experimental data highlight a strong slowing down of water in the presence of disaccharides. The whole set of findings indicates, therefore, a noticeable disaccharide-water interaction, which is more intense in the case of trehalose. This feature can justify its higher bioprotective effectiveness.
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Affiliation(s)
- S Magazù
- Dipartimento di Fisica, Università di Messina, PO Box 55, S.ta Sperone C.da Papardo, 98166 Messina, Italy.
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33
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Tomkinson J, Telling MTF. Ammonium ions in alkali metal halide crystals: tunnelling and spin relaxation. Phys Chem Chem Phys 2006; 8:4434-40. [PMID: 17001411 DOI: 10.1039/b608590c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have used low energy inelastic neutron scattering spectroscopy to examine the tunnelling spectroscopy of the ammonium ion in the (NH4)0.02Rb(x)K(0.98-x)I system. The concentration of different species were varied as x increased, this was followed systematically and the first consistent assignment scheme for these features is given. Differences were also found for the relaxation rate of the spin temperature inversions that could be generated in these species. At a critical concentration--about x = 0.04 mole fraction--the relaxation rates of the species changed dramatically.
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Affiliation(s)
- J Tomkinson
- The ISIS Facility, The Rutherford Appleton Laboratory, CCLRC, Chilton, UK OX11 0QX.
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34
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Yaron PN, Telling MTF, Larese JZ. Thermodynamic investigation of n-hexane thin films adsorbed on magnesium oxide. Langmuir 2006; 22:7203-7. [PMID: 16893216 DOI: 10.1021/la060996c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
The thermodynamic properties of n-hexane adsorption on MgO(100) were determined using high-resolution volumetric adsorption isotherms in the temperature range 195-255 K. Two distinct layering transitions are observed in the isotherms. The isotherms are used to calculate the two-dimensional compressibility, the differential enthalpy and entropy, the heat of adsorption, and the isosteric heat of adsorption. Neutron Diffraction is used to identify where melting of the n-hexane monolayer takes place.
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Affiliation(s)
- Peter N Yaron
- University of Tennessee, Knoxville, Buehler Hall, Knoxville, Tennessee 37996-1600, USA
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35
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Zajac W, Urban S, Domenici V, Geppi M, Veracini CA, Telling MTF, Gabryś BJ. Stochastic molecular motions in the nematic, smectic-A, and solid phases of p,p'-di-n-heptyl-azoxybenzene as seen by quasielastic neutron scattering and 13C cross-polarization magic-angle-spinning NMR. Phys Rev E Stat Nonlin Soft Matter Phys 2006; 73:051704. [PMID: 16802951 DOI: 10.1103/physreve.73.051704] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2005] [Indexed: 05/10/2023]
Abstract
Molecular rotational dynamics in p,p'-di-n-heptyl-azoxybenzene was studied by means of quasielastic neutron scattering (QENS) and 13C cross-polarization magic-angle-spinning (CPMAS) NMR. Fast reorientation of the hydrogen nuclei was observed by QENS in the two liquid crystalline (LC) phases nematic and smectic A, as well as in the crystalline phase. The latter could not be restricted to the -CH3 rotations alone, and a clear indication was found of some other reorientation motions persisting in the crystal. Two Lorentz-type components convoluted with the resolution function gave an excellent fit to the QENS spectra in both LC phases. The narrow (slow) component was attributed to the reorientation of the whole molecule around the long axis. The corresponding characteristic time of approximately 130 ps agreed well with the values obtained in recent dielectric relaxation and 2H NMR studies. The full width at half maximum of the broader (fast) component shows a quadratic Q dependence (Q is the momentum transfer). Hence the corresponding motions could be described by a stretched exponential correlation function and were interpreted as various "crankshaft-type" motions within the alkyl tails. The 13C CPMAS experiments fully corroborated the QENS results, sometimes considered ambiguous in complex systems.
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Affiliation(s)
- Wojciech Zajac
- The H. Niewodniczański Institute of Nuclear Physics, Polish Academy of Sciences, Radzikowskiego 152, 31-342 Kraków, Poland.
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36
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Ibberson RM, Telling MTF, Parsons S. Structure determination and phase transition behaviour of dimethyl sulfate. Acta Crystallogr B Struct Sci 2006; 62:280-6. [PMID: 16552162 DOI: 10.1107/s0108768106001893] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2005] [Accepted: 01/17/2006] [Indexed: 11/11/2022]
Abstract
The crystal structures of phase I and phase II of dimethyl sulfate, (CH3O)2SO2, have been determined using complementary high-resolution neutron powder and single-crystal X-ray diffraction techniques. Below its melting point of 241 K dimethyl sulfate crystallizes in an orthorhombic structure (I) in the space group Fdd2. On cooling below ∼175 K the crystal transforms to a monoclinic structure (II) in the space group I2/a. The molecule is located on a twofold axis (Z′ = 1/2) in both structures. The phase transition is of first order with strong hysteresis. The phase transition results in changes to both the intra- and the intermolecular coordination environment.
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Affiliation(s)
- Richard M Ibberson
- ISIS Facility, CCLRC--Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, England.
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Magazù S, Migliardo F, Telling MTF. α,α-Trehalose−Water Solutions. VIII. Study of the Diffusive Dynamics of Water by High-Resolution Quasi Elastic Neutron Scattering. J Phys Chem B 2005; 110:1020-5. [PMID: 16471637 DOI: 10.1021/jp0536450] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The present paper shows high-resolution quasi-elastic neutron scattering (QENS) findings on homologues disaccharides (i.e. trehalose, maltose, and sucrose)-water mixtures as a function of temperature. The QENS measurements were performed on both partially deuterated disaccharides in D2O and on hydrogenated disaccharides in H2O to separate the solute dynamics from that of the solvent. The results highlight a noticeable disaccharide kosmotrope character, with results more marked for trehalose. Such evidence accounts for its higher bioprotective effectiveness.
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Affiliation(s)
- Salvatore Magazù
- Dipartimento di Fisica, Università di Messina, P.O. Box 55, I-98166 Messina, Italy. smagazu@.unime.it
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Russina O, Triolo A, Aihara Y, Telling MTF, Grimm H. Quasi-Elastic Neutron Scattering Investigation of Dynamics in Polymer Electrolytes. Macromolecules 2004. [DOI: 10.1021/ma0493574] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Olga Russina
- Hahn-Meitner Institut, Glienicker Str. 100, D-14109 Berlin, Germany; Istituto per i Processi Chimico-Fisici-CNR, via La Farina 237, 98123 Messina, Italy; Yuasa Corporation, 4-5-1 Ohgi-cho, Odawara 250-0001, Japan; ISIS Facility, Rutherford Appleton Laboratory, Chilton, OXON, U.K.; and Institut für Festkörperforschung, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany
| | - Alessandro Triolo
- Hahn-Meitner Institut, Glienicker Str. 100, D-14109 Berlin, Germany; Istituto per i Processi Chimico-Fisici-CNR, via La Farina 237, 98123 Messina, Italy; Yuasa Corporation, 4-5-1 Ohgi-cho, Odawara 250-0001, Japan; ISIS Facility, Rutherford Appleton Laboratory, Chilton, OXON, U.K.; and Institut für Festkörperforschung, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany
| | - Yuichi Aihara
- Hahn-Meitner Institut, Glienicker Str. 100, D-14109 Berlin, Germany; Istituto per i Processi Chimico-Fisici-CNR, via La Farina 237, 98123 Messina, Italy; Yuasa Corporation, 4-5-1 Ohgi-cho, Odawara 250-0001, Japan; ISIS Facility, Rutherford Appleton Laboratory, Chilton, OXON, U.K.; and Institut für Festkörperforschung, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany
| | - Mark T. F. Telling
- Hahn-Meitner Institut, Glienicker Str. 100, D-14109 Berlin, Germany; Istituto per i Processi Chimico-Fisici-CNR, via La Farina 237, 98123 Messina, Italy; Yuasa Corporation, 4-5-1 Ohgi-cho, Odawara 250-0001, Japan; ISIS Facility, Rutherford Appleton Laboratory, Chilton, OXON, U.K.; and Institut für Festkörperforschung, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany
| | - Hans Grimm
- Hahn-Meitner Institut, Glienicker Str. 100, D-14109 Berlin, Germany; Istituto per i Processi Chimico-Fisici-CNR, via La Farina 237, 98123 Messina, Italy; Yuasa Corporation, 4-5-1 Ohgi-cho, Odawara 250-0001, Japan; ISIS Facility, Rutherford Appleton Laboratory, Chilton, OXON, U.K.; and Institut für Festkörperforschung, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany
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Arrighi V, Gagliardi S, Zhang C, Ganazzoli F, Higgins JS, Ocone R, Telling MTF. A Unified Picture of the Local Dynamics of Poly(dimethylsiloxane) across the Melting Point. Macromolecules 2003. [DOI: 10.1021/ma034843x] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Valeria Arrighi
- Chemistry, School of Engineering and Physical Sciences, Heriot-Watt University, EH14 4AS Edinburgh, UK
| | - Simona Gagliardi
- Chemistry, School of Engineering and Physical Sciences, Heriot-Watt University, EH14 4AS Edinburgh, UK
| | - Chuhong Zhang
- Chemistry, School of Engineering and Physical Sciences, Heriot-Watt University, EH14 4AS Edinburgh, UK
| | - Fabio Ganazzoli
- Dipartimento di Chimica, Materiali e Ing. Chimica “Giulio Natta“, Sez. Chimica Politecnico di Milano via L. Mancinelli 7, 20131 Milano, Italy
| | - Julia S. Higgins
- Department of Chemical Engineering and Chemical Technology, Imperial College, South Kensington Campus, London, SW7 2AZ, UK
| | - Raffaella Ocone
- Chemical Engineering, School of Engineering and Physical Sciences, Heriot-Watt University, EH14 4AS Edinburgh, UK
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Paradossi G, Cavalieri F, Chiessi E, Telling MTF. Supercooled Water in PVA Matrixes: I. An Incoherent Quasi-Elastic Neutron Scattering (QENS) Study. J Phys Chem B 2003. [DOI: 10.1021/jp034542p] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Gaio Paradossi
- Dipartimento di Scienze e Tecnologie Chimiche and INFM, Sezione B, Università di Roma “Tor Vergata”. Via della Ricerca Scientifica, 00133 Roma, Italy and Rutherford Appleton Laboratory, Chilton Didcot, Oxfordshire OX11 0QX, United Kingdom
| | - Francesca Cavalieri
- Dipartimento di Scienze e Tecnologie Chimiche and INFM, Sezione B, Università di Roma “Tor Vergata”. Via della Ricerca Scientifica, 00133 Roma, Italy and Rutherford Appleton Laboratory, Chilton Didcot, Oxfordshire OX11 0QX, United Kingdom
| | - Ester Chiessi
- Dipartimento di Scienze e Tecnologie Chimiche and INFM, Sezione B, Università di Roma “Tor Vergata”. Via della Ricerca Scientifica, 00133 Roma, Italy and Rutherford Appleton Laboratory, Chilton Didcot, Oxfordshire OX11 0QX, United Kingdom
| | - Mark T. F. Telling
- Dipartimento di Scienze e Tecnologie Chimiche and INFM, Sezione B, Università di Roma “Tor Vergata”. Via della Ricerca Scientifica, 00133 Roma, Italy and Rutherford Appleton Laboratory, Chilton Didcot, Oxfordshire OX11 0QX, United Kingdom
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Arrighi V, Batt-Coutrot D, Zhang C, Telling MTF, Triolo A. Effect of tacticity on the local dynamics of polypropylene melts. J Chem Phys 2003. [DOI: 10.1063/1.1579476] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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