Viscoelastic properties of room temperature ionic liquids

Wataru Makino, Ryoko Kishikawa, Makoto Mizoshiri, Shinichi Takeda, Makoto Yao

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)


The sound absorption coefficient α and sound velocity vS have been measured for 1-alkyl-3-methylimidazolium hexafluorophosphate [Cn mim] PF 6, with n=8,6,4 and 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide [C4 mim]TFSI, at the frequencies of 11.3, 34.9, and 57.7 MHz in the temperature range from 293 to 393 K. From the obtained α and available viscosity data, [Cn mim] PF6 with large n proves to be no longer Newtonian liquids at room temperatures. Applying a Maxwell viscoelastic model with the elastic modulus G of a spring and the shear coefficient γ of a dashpot to the experimental frequency dependence of α, one finds that G is insensitive to n, while the relaxation time τ (=γG), which is on the order of nanoseconds, does depend on n.

Original languageEnglish
Article number104510
JournalJournal of Chemical Physics
Issue number10
Publication statusPublished - 2008
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry


Dive into the research topics of 'Viscoelastic properties of room temperature ionic liquids'. Together they form a unique fingerprint.

Cite this