Citation: BU Xiao-Xue, FAN Ben-Han, WEI Jie, XING Nan-Nan, MA Xiao-Xue, GUAN Wei. Thermodynamic Properties and Predicting the Surface Tension of Pyridinium-Based Ionic Liquids of [C₆py][DCA] Using a New Eötvös Equation[J]. Acta Physico-Chimica Sinica, ;2016, 32(1): 267-273. doi: 10.3866/PKU.WHXB201510303 shu

Thermodynamic Properties and Predicting the Surface Tension of Pyridinium-Based Ionic Liquids of [C₆py][DCA] Using a New Eötvös Equation

BU Xiao-Xue ¹ ,
FAN Ben-Han ¹ ,
WEI Jie ¹ ,
XING Nan-Nan ^1,2 ,
MA Xiao-Xue ¹ ,
GUAN Wei ^1,,

1.
1 College of Chemistry, Liaoning University, Shenyang 110036, P. R. China;
2.
2 College of Chemistry and Chemical Engineering, Huangshang University, Huangshan 245041, Anhui Province, P. R. China

Corresponding author: GUAN Wei,
Received Date: 9 September 2015
Available Online: 28 October 2015
Fund Project: 国家自然科学基金(21173107) (21173107)辽宁省高等学校优秀人才支持计划(2015025)资助项目 (2015025)

The pyridinium-based ionic liquids [C₆py][DCA] (N-hexyl-pyridinium dicyanamide) was prepared and characterized using ¹H and ¹³C nuclear magnetic responancec (NMR) spectroscopies, Fourier transform infrared (FT-IR) spectroscopy, and differential scanning calorimetry (DSC). The density (ρ), surface tension (γ), and refractive indices (n_D) were measured at the temperature range from 288.15 to 338.15 K. Molecular volume (V_m), energy of surface (E_a), molar polarization (R_m), and polarization coefficient of [C₆py][DCA] (α_p) were calculated from the experimental data. E_a, R_m, and α_p were approximately temperature-independent. The concept of molar surface Gibbs free energy (g_s) was conceived, for which a new Eötvös equation was derived. The g_s, critical temperature (T_c), and Eötvös empirical parameter related to polarity (k_E) were also obtained. The new Eötvös equation was used to predict the surface tension and the predicted values of [C₆py][DCA] are in close agreement with the corresponding experimental ones.
- Pyridinium-based ionic liquid,
- Density,
- Surface tension,
- Molar surface Gibbs free energy,
- Eötvös equation
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Thermodynamic Properties and Predicting the Surface Tension of Pyridinium-Based Ionic Liquids of [C6py][DCA] Using a New Eötvös Equation

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通讯作者: 陈斌, bchen63@163.com

Thermodynamic Properties and Predicting the Surface Tension of Pyridinium-Based Ionic Liquids of [C₆py][DCA] Using a New Eötvös Equation