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Magnetic field effects dynamics of ethylammonium nitrate ionic liquid confined between glass plates
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering. Institute of Physics, Kazan Federal University, Kazan, Russia .ORCID iD: 0000-0002-6810-1882
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering. Department of Physics, Warwick University, Coventry, United Kingdom .ORCID iD: 0000-0003-1067-7990
2018 (English)In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 20, no 9, p. 6316-6320Article in journal (Refereed) Published
Abstract [en]

Self-diffusion and NMR relaxation of the ethylammonium (EA) cation were studied in the protic ionic liquid, ethylammonium nitrate (EAN), confined between polar glass plates separated by a few μm distance and exposed to an external magnetic field of 9.4 T. The diffusion coefficient of EA (D) and the transverse NMR relaxation rate (1/T2) of –NH3 protons were increased immediately after placing the sample in the magnetic field by factors of ∼2 and ∼22, respectively, in comparison with those of bulk EAN. Further exposure of the sample to the magnetic field led to gradual changes in D, T1 and T2 towards their bulk values with a time constant of ∼70 min. Complete “recovery” of the sample to the “accelerated” D and “shortened” T2 values occurred at longer than 24 hours after the removal of the EAN sample from the magnet. Because the observed characteristic times of the change far exceed the times of molecular processes in EAN, we suggested that this phenomenon is related to reversible phase transformations occurring in confined EAN.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2018. Vol. 20, no 9, p. 6316-6320
National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
URN: urn:nbn:se:ltu:diva-67667DOI: 10.1039/C7CP06554JISI: 000429280100031PubMedID: 29435522Scopus ID: 2-s2.0-85042794831OAI: oai:DiVA.org:ltu-67667DiVA, id: diva2:1182903
Note

Validerad;2018;Nivå 2;2018-03-22 (rokbeg)

Available from: 2018-02-15 Created: 2018-02-15 Last updated: 2018-04-26Bibliographically approved

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