Thorough studies of tricyanomethanide-based ionic liquids - the influence of alkyl chain length of the cation

The glassy, supercooled, and normal liquid states of the 1-alkyl-3-methylimidazolium tricyanomethanide series [C n C 1 im][TCM] ( n = 2, 4, 6, 8, and 16) were investigated by dielectric and mechanical (rheological) experiments supplemented by X-ray diffraction. The conductivity relaxation was found...

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Bibliographic Details
Published in:Soft matter 2020-10, Vol.16 (41), p.9479-9487
Main Authors: Musia, Ma gorzata, Cheng, Shinian, Wojnarowska, Zaneta, Yao, Beibei, Jurkiewicz, Karolina, Paluch, Marian
Format: Article
Language:English
Subjects:
Cations
Chains
Dielectric relaxation
Ionic liquids
Ions
Loss modulus
Rheological properties
Shear modulus
Solvents
X-ray diffraction
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Summary:The glassy, supercooled, and normal liquid states of the 1-alkyl-3-methylimidazolium tricyanomethanide series [C n C 1 im][TCM] ( n = 2, 4, 6, 8, and 16) were investigated by dielectric and mechanical (rheological) experiments supplemented by X-ray diffraction. The conductivity relaxation was found to be accompanied by a pronounced secondary relaxation. However, based on ambient and high-pressure results as well as the coupling model, we assumed that the latter one can not be classified as Johari-Goldstein relaxation. Moreover, the studies on the nanoscale organization of ionic liquids indicated that 1-alkyl-3-methylimidazolium tricyanomethanide ILs begin to form nanoscale aggregates when the alkyl chain of the cation has six carbon atoms. Thorough studies of the homologous tricyanomethanide series using dielectric and mechanical experiments along with X-ray diffraction.
ISSN:1744-683X
1744-6848
DOI:10.1039/d0sm01433h