Effects of lithium salts on shear relaxation spectra of pyrrolidinium-based ionic liquids

Tsuyoshi Yamaguchi, Ken Ichi Mikawa, Shinobu Koda, Nobuyuki Serizawa, Shiro Seki, Kenta Fujii, Yasuhiro Umebayashi

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


The shear relaxation spectra of the solutions of lithium salts in ionic liquids composed of N-methyl-N-propylpyrrolidinium cation paired with bis(trifluoromethanesulfonyl)amide (TFSA-) or bis(fluorosulfonyl) amide (FSA-) anions are determined from 5 to 205 MHz at various concentrations of lithium salts. The addition of lithium salt retards the shear relaxation, together with the increase in the shear viscosity. The normalized spectra reduce to a single curve when plotted against the product of the frequency and zero-frequency shear viscosity, which indicates that the increase in the shear viscosity by lithium salts is ascribed to the increase in the relaxation time. The difference in the shear viscosity of TFSA- and FSA-based ionic liquids is also elucidated in terms of the shear relaxation time. The relationship with previous studies on ionic mobility and liquid structure is also discussed.

Original languageEnglish
Pages (from-to)7322-7327
Number of pages6
JournalJournal of Physical Chemistry B
Issue number24
Publication statusPublished - 2012 Jun 21
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry


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