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Titolo:
Dynamic heterogeneity in polymer electrolytes. Comparison between QENS data and MD simulations
Autore:
Triolo, A; Arrighi, V; Triolo, R; Passerini, S; Mastragostino, M; Lechner, RE; Ferguson, R; Borodin, O; Smith, GD;
Indirizzi:
Hahn Meitner Inst BENSC, D-14109 Berlin, Germany Hahn Meitner Inst BENSC Berlin Germany D-14109 , D-14109 Berlin, Germany Heriot Watt Univ, Edinburgh, Midlothian, Scotland Heriot Watt Univ Edinburgh Midlothian Scotland rgh, Midlothian, Scotland Univ Palermo, Palermo, Italy Univ Palermo Palermo ItalyUniv Palermo, Palermo, Italy ENEA, Rome, Italy ENEA Rome ItalyENEA, Rome, Italy Univ Bologna, Bologna, Italy Univ Bologna Bologna ItalyUniv Bologna, Bologna, Italy Univ Utah, Salt Lake City, UT USA Univ Utah Salt Lake City UT USAUniv Utah, Salt Lake City, UT USA
Titolo Testata:
PHYSICA B
fascicolo: 1-2, volume: 301, anno: 2001,
pagine: 163 - 167
SICI:
0921-4526(200107)301:1-2<163:DHIPEC>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
POLY(ETHYLENE OXIDE)/LII MELTS; LITHIUM IODIDE; RELAXATION;
Keywords:
polymer electrolytes; quasi-elastic neutron scattering; dynamics; molecular dynamics simulations;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
20
Recensione:
Indirizzi per estratti:
Indirizzo: Triolo, A Hahn Meitner Inst BENSC, Glienicker Str 100, D-14109 Berlin, Germany Hahn Meitner Inst BENSC Glienicker Str 100 Berlin Germany D-14109
Citazione:
A. Triolo et al., "Dynamic heterogeneity in polymer electrolytes. Comparison between QENS data and MD simulations", PHYSICA B, 301(1-2), 2001, pp. 163-167

Abstract

We have investigated the dynamics of poly(ethylene oxide) (PEO) lithium-based salt electrolytes (PEO-LiBETI) using quasi-elastic neutron scattering (QENS). Measurements were carried out on the spectrometer NEAT (HMI, Berlin)above the melting temperature of PEO (T(m)approximate to 65 degreesC). Theexperimental data fully support the Molecular Dynamics (MD)-derived model of a heterogeneous dynamics in dilute PEG-salt electrolytes. In agreement with MD simulations carried out on PEO-LiPF6, we find evidences for the existence of two dynamic processes: (a) a faster process that is described in terms of the pure PEO dynamics and (b) a second component which we identify with the slower motion of the PEO chains involved in PEO-Li+ complexes. At this stage, due to the differences in PEO molecular weight and the anion chemical nature, the agreement with MD simulations is qualitative. (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 10/07/20 alle ore 09:49:26