Effect of Temperature and Alkyl Chain Length on the Physicochemical Properties of Pyridinium Bis(Trifluoromethylsulfonyl)Imide-Based Ionic Liquids

Aljasmi, Abdullah; Alkhaldi, Khaled H.A.E.; Aljimaz, Adel; AlTuwaim, Mohammad S.

doi:10.2139/ssrn.4156496

Cited by 1 publication

(2 citation statements)

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“…Furthermore, surface tension is less influenced by Coulombic interactions in longer alkyl chains than in shorter alkyl chains, 69 which may explain the decreasing trend of surface tension with alkyl chain length elongation. 74 at 298.15 K were compared to study the effect of the anion type Table 3. Parameters of Equation 1 and Standard Mean Deviation (δ) ].…”

Section: Isentropic Compressibilitymentioning

confidence: 99%

“…A comparative investigation of the physical properties of different combinations of anions and alkyl chains demonstrates that the anions have the dominant influence on the properties, which is consistent with previous studies. 26,[65][66][67][68]74 Figures S1−S5 in the Supporting Information file depict the alkyl chain effect on the density, viscosity, speed of sound, surface tension, and refractive index of 1-alkyl-3-methylimidazoulium hexafluorophosphate [C n C 1 im]-[PF 6 ] (n = 4, 5, 6, 7, 8, and 9). As illustrated, as the length of the alkyl chain increases, the density, speed of sound, and surface tension decrease.…”

Section: Isentropic Compressibilitymentioning

confidence: 99%

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Influence of Temperature, Anions, and Alkyl Chain Length on the Density, Viscosity, Speed of Sound, Surface Tension, and Refractive Index of Imidazolium Hexafluorophosphate-Based Ionic Liquids

Aljasmi,

AlJimaz,

AlKhaldi

et al. 2024

J. Chem. Eng. Data

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The densities, refractive indices, viscosities, surface tensions, and speed of sound of [C n eim][PF6] (n = 3, 4) and [C n mim][PF6] (n = 4, 5, 6, 7, 8, 9) were experimentally determined and analyzed at temperatures ranging from 293.15 to 343.15 K, under atmospheric pressure conditions. All of the properties decrease as the temperature increases, as expected, with viscosity being the most influenced by the temperature change. The density, speed of sound, surface tension, and refractive index are estimated by using linear correlation as a function of temperature, whereas viscosity is correlated by using the well-known Vogel–Fulcher–Tammann (VFT) equation. The corresponding coefficients of thermal expansion were determined by using the experimental density data. Moreover, the Laplace–Newton equation was used to calculate the isentropic compressibility. Furthermore, the influence of anion type and alkyl chains on the thermophysical properties of the studied ionic liquids is studied. Based on the findings, the physical properties of the investigated ionic liquids are greatly influenced by the nature of the anion, while the alkyl chain has less significance. As the alkyl chain length increases, the density, speed of sound, and surface tension all decrease. Viscosity and refractive index, on the other hand, exhibit diametrically opposed behavior. Furthermore, a comparison between theoretical models for density, surface tension, speed of sound, and experimental values obtained from this work is discussed.

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Section: Isentropic Compressibilitymentioning

confidence: 99%