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

doi:10.1021/jp3032308

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 journal › Article › peer-review

4 Citations (Scopus)

Abstract

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 language	English
Pages (from-to)	7322-7327
Number of pages	6
Journal	Journal of Physical Chemistry B
Volume	116
Issue number	24
DOIs	https://doi.org/10.1021/jp3032308
Publication status	Published - 2012 Jun 21
Externally published	Yes

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Surfaces, Coatings and Films
Materials Chemistry

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title = "Effects of lithium salts on shear relaxation spectra of pyrrolidinium-based ionic liquids",

abstract = "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.",

author = "Tsuyoshi Yamaguchi and Mikawa, {Ken Ichi} and Shinobu Koda and Nobuyuki Serizawa and Shiro Seki and Kenta Fujii and Yasuhiro Umebayashi",

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doi = "10.1021/jp3032308",

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journal = "Journal of Physical Chemistry B",

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T1 - Effects of lithium salts on shear relaxation spectra of pyrrolidinium-based ionic liquids

AU - Yamaguchi, Tsuyoshi

AU - Mikawa, Ken Ichi

AU - Koda, Shinobu

AU - Serizawa, Nobuyuki

AU - Seki, Shiro

AU - Fujii, Kenta

AU - Umebayashi, Yasuhiro

PY - 2012/6/21

Y1 - 2012/6/21

N2 - 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.

AB - 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.

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