Simultaneous Measurement of Speed of Sound, Thermal Diffusivity, and Bulk Viscosity of 1-Ethyl-3-methylimidazolium-Based Ionic Liquids Using Laser-Induced Gratings

Dimitrii N. Kozlov; Johannes Kiefer; Thomas Seeger; Andreas P. Froeba; Alfred Leipertz

doi:10.1021/jp510186x

Simultaneous Measurement of Speed of Sound, Thermal Diffusivity, and Bulk Viscosity of 1-Ethyl-3-methylimidazolium-Based Ionic Liquids Using Laser-Induced Gratings

Dimitrii N. Kozlov, Johannes Kiefer^*, Thomas Seeger, Andreas P. Froeba, Alfred Leipertz

^*Corresponding author for this work

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Abstract

The technique of laser-induced gratings (LIGs) has been applied to the simultaneous determination of speed of sound and thermal diffusivity of four 1-ethyl-3-methylimidazolium ([EMIm])-based room temperature ionic liquids (RTILs)-[EMIm][N(CN)(2)], [EMIm][MeSO3], [EMIm][C(CN)(3)], and [EMIm][NTf2]-at ambient pressure (1 bar (0.1 MPa)) and temperature (28 degrees C (301 K)). Transient laser-induced gratings were created as a result of thermalization of a quasi-resonant excitation of highly lying combinational vibrational states of the RTIL molecules and electrostrictive compression of the liquid by radiation of a pulse-repetitive Q-switched Nd:YAG pump laser (1064 nm). The LIGs temporal evolution was recorded using Bragg diffraction of the radiation from a continuous-wave probe laser (532 nm). By fitting the temporal profiles of the LIG signals, the speed of sound and thermal diffusivity were determined, and the isentropic compressibility and thermal conductivity were calculated. Independently, the special experimental arrangement allowed the measurement of the damping of the laser-excited acoustic waves and the derivation of the RTIL bulk viscosity for the first time.

Original language	English
Pages (from-to)	14493-14501
Number of pages	9
Journal	The Journal of Physical Chemistry B
Volume	118
Issue number	49
Early online date	21 Nov 2014
DOIs	https://doi.org/10.1021/jp510186x
Publication status	Published - 11 Dec 2014

Bibliographical note

Technical assistance of B. Roshani and J. Lehmann is acknowledged. Part of this work was supported financially by the German Research Foundation (DFG), project SE 804/3-1, and by the Russian Foundation for Basic Research (RFBR), grant No. 08-02-91958. The authors also acknowledge support from the Erlangen Graduate School in Advanced Optical Technologies (SAOT) and the DFG-SPP 1191 priority program, grant FR 1709/9-1.

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Simultaneous Measurement of Speed of Sound, Thermal Diffusivity, and Bulk Viscosity of 1-Ethyl-3-methylimidazolium-Based Ionic Liquids Using Laser-Induced Gratings. / Kozlov, Dimitrii N.; Kiefer, Johannes; Seeger, Thomas et al.
In: The Journal of Physical Chemistry B, Vol. 118, No. 49, 11.12.2014, p. 14493-14501.

Research output: Contribution to journal › Article › peer-review

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title = "Simultaneous Measurement of Speed of Sound, Thermal Diffusivity, and Bulk Viscosity of 1-Ethyl-3-methylimidazolium-Based Ionic Liquids Using Laser-Induced Gratings",

abstract = "The technique of laser-induced gratings (LIGs) has been applied to the simultaneous determination of speed of sound and thermal diffusivity of four 1-ethyl-3-methylimidazolium ([EMIm])-based room temperature ionic liquids (RTILs)-[EMIm][N(CN)(2)], [EMIm][MeSO3], [EMIm][C(CN)(3)], and [EMIm][NTf2]-at ambient pressure (1 bar (0.1 MPa)) and temperature (28 degrees C (301 K)). Transient laser-induced gratings were created as a result of thermalization of a quasi-resonant excitation of highly lying combinational vibrational states of the RTIL molecules and electrostrictive compression of the liquid by radiation of a pulse-repetitive Q-switched Nd:YAG pump laser (1064 nm). The LIGs temporal evolution was recorded using Bragg diffraction of the radiation from a continuous-wave probe laser (532 nm). By fitting the temporal profiles of the LIG signals, the speed of sound and thermal diffusivity were determined, and the isentropic compressibility and thermal conductivity were calculated. Independently, the special experimental arrangement allowed the measurement of the damping of the laser-excited acoustic waves and the derivation of the RTIL bulk viscosity for the first time.",

author = "Kozlov, {Dimitrii N.} and Johannes Kiefer and Thomas Seeger and Froeba, {Andreas P.} and Alfred Leipertz",

note = "Technical assistance of B. Roshani and J. Lehmann is acknowledged. Part of this work was supported financially by the German Research Foundation (DFG), project SE 804/3-1, and by the Russian Foundation for Basic Research (RFBR), grant No. 08-02-91958. The authors also acknowledge support from the Erlangen Graduate School in Advanced Optical Technologies (SAOT) and the DFG-SPP 1191 priority program, grant FR 1709/9-1.",

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N2 - The technique of laser-induced gratings (LIGs) has been applied to the simultaneous determination of speed of sound and thermal diffusivity of four 1-ethyl-3-methylimidazolium ([EMIm])-based room temperature ionic liquids (RTILs)-[EMIm][N(CN)(2)], [EMIm][MeSO3], [EMIm][C(CN)(3)], and [EMIm][NTf2]-at ambient pressure (1 bar (0.1 MPa)) and temperature (28 degrees C (301 K)). Transient laser-induced gratings were created as a result of thermalization of a quasi-resonant excitation of highly lying combinational vibrational states of the RTIL molecules and electrostrictive compression of the liquid by radiation of a pulse-repetitive Q-switched Nd:YAG pump laser (1064 nm). The LIGs temporal evolution was recorded using Bragg diffraction of the radiation from a continuous-wave probe laser (532 nm). By fitting the temporal profiles of the LIG signals, the speed of sound and thermal diffusivity were determined, and the isentropic compressibility and thermal conductivity were calculated. Independently, the special experimental arrangement allowed the measurement of the damping of the laser-excited acoustic waves and the derivation of the RTIL bulk viscosity for the first time.

AB - The technique of laser-induced gratings (LIGs) has been applied to the simultaneous determination of speed of sound and thermal diffusivity of four 1-ethyl-3-methylimidazolium ([EMIm])-based room temperature ionic liquids (RTILs)-[EMIm][N(CN)(2)], [EMIm][MeSO3], [EMIm][C(CN)(3)], and [EMIm][NTf2]-at ambient pressure (1 bar (0.1 MPa)) and temperature (28 degrees C (301 K)). Transient laser-induced gratings were created as a result of thermalization of a quasi-resonant excitation of highly lying combinational vibrational states of the RTIL molecules and electrostrictive compression of the liquid by radiation of a pulse-repetitive Q-switched Nd:YAG pump laser (1064 nm). The LIGs temporal evolution was recorded using Bragg diffraction of the radiation from a continuous-wave probe laser (532 nm). By fitting the temporal profiles of the LIG signals, the speed of sound and thermal diffusivity were determined, and the isentropic compressibility and thermal conductivity were calculated. Independently, the special experimental arrangement allowed the measurement of the damping of the laser-excited acoustic waves and the derivation of the RTIL bulk viscosity for the first time.

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Simultaneous Measurement of Speed of Sound, Thermal Diffusivity, and Bulk Viscosity of 1-Ethyl-3-methylimidazolium-Based Ionic Liquids Using Laser-Induced Gratings

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