Bitte benutzen Sie diese Referenz, um auf diese Ressource zu verweisen: doi:10.22028/D291-39310
Titel: Pressure and Temperature Dependence of Local Structure and Dynamics in an Ionic Liquid
VerfasserIn: Lundin, Filippa
Hansen, Henriette Wase
Adrjanowicz, Karolina
Frick, Bernhard
Rauber, Daniel
Hempelmann, Rolf
Shebanova, Olga
Niss, Kristine
Matic, Aleksandar
Sprache: Englisch
Titel: The Journal of Physical Chemistry : B
Bandnummer: 125
Heft: 10
Seiten: 2719-2728
Verlag/Plattform: American Chemical Society
Erscheinungsjahr: 2021
Freie Schlagwörter: Cations
Chemical structure
Diffusion
Salts
Solvents
DDC-Sachgruppe: 500 Naturwissenschaften
Dokumenttyp: Journalartikel / Zeitschriftenartikel
Abstract: A detailed understanding of the local dynamics in ionic liquids remains an important aspect in the design of new ionic liquids as advanced functional fluids. Here, we use small-angle X-ray scattering and quasi-elastic neutron spectroscopy to investigate the local structure and dynamics in a model ionic liquid as a function of temperature and pressure, with a particular focus on state points (P,T) where the macroscopic dynamics, i.e., conductivity, is the same. Our results suggest that the initial step of ion transport is a confined diffusion process, on the nanosecond timescale, where the motion is restricted by a cage of nearest neighbors. This process is invariant considering timescale, geometry, and the participation ratio, at state points of constant conductivity, i.e., state points of isoconductivity. The connection to the nearest-neighbor structure is underlined by the invariance of the peak in the structure factor corresponding to nearest-neighbor correlations. At shorter timescales, picoseconds, two localized relaxation processes of the cation can be observed, which are not directly linked to ion transport. However, these processes also show invariance at isoconductivity. This points to that the overall energy landscape in ionic liquids responds in the same way to density changes and is mainly governed by the nearest-neighbor interactions.
DOI der Erstveröffentlichung: 10.1021/acs.jpcb.1c00147
URL der Erstveröffentlichung: https://doi.org/10.1021/acs.jpcb.1c00147
Link zu diesem Datensatz: urn:nbn:de:bsz:291--ds-393107
hdl:20.500.11880/35440
http://dx.doi.org/10.22028/D291-39310
ISSN: 1520-5207
1520-6106
Datum des Eintrags: 15-Mär-2023
Bezeichnung des in Beziehung stehenden Objekts: Supporting Information
In Beziehung stehendes Objekt: https://pubs.acs.org/doi/suppl/10.1021/acs.jpcb.1c00147/suppl_file/jp1c00147_si_001.pdf
Fakultät: NT - Naturwissenschaftlich- Technische Fakultät
Fachrichtung: NT - Chemie
Professur: NT - Prof. Dr. Kaspar Hegetschweiler
NT - Prof. Dr. Christopher Kay
Sammlung:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

Dateien zu diesem Datensatz:
Datei Beschreibung GrößeFormat 
acs.jpcb.1c00147.pdf2,21 MBAdobe PDFÖffnen/Anzeigen


Diese Ressource wurde unter folgender Copyright-Bestimmung veröffentlicht: Lizenz von Creative Commons Creative Commons