Acoustic and volumetric properties of triflate-based ionic liquids at high pressures

IF 2.8 3区工程技术 Q3 CHEMISTRY, PHYSICAL

Fluid Phase Equilibria Pub Date : 2024-07-14 DOI:10.1016/j.fluid.2024.114179

Roman N. Belenkov , Vyachelav V. Melent’ev , Alexander V. Sychev , Olga S. Ryshkova , Michał Wasiak , Mirosław Chora̧żewski , Eugene B. Postnikov

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引用次数: 0

Abstract

We report new experimental data of the ultrasonic measurements in three ionic liquids with triflate anion: 1-ethylpyridinium triflate, 1-butyl-3-methylimidazolium triflate, diethylmethylammonium triflate. The speed of sound was determined in the temperature range of $(297 – 374) K$ and the pressure range of $(0.1 – 196.2) MPa$ . In addition, the respective densities in this range were found using the acoustic route. For the first two substances, the effect of pressure-induced solidification is detected. It is shown that the high-pressure data on the sound velocity can be accurately predicted by applying the pressure fluctuation theory-based model using parameters, which requires only the data determined at the ambient atmospheric pressure. In turn, the density can be predicted using the Fluctuation Theory-based Equation of State (FT-EoS), which includes the isothermal nonlinearity parameter, which is argued as related to the frequency of interparticle oscillations. This interdependence is confirmed by the comparative analysis with the respective peak in the low-frequency Raman–Kerr spectrum.

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三盐酸盐基离子液体在高压下的声学和体积特性

我们报告了在三种含有三氟酸盐阴离子的离子液体（三氟酸盐 1-乙基吡啶鎓、三氟酸盐 1-丁基-3-甲基咪唑鎓和三氟酸盐二乙基甲基铵）中进行超声波测量的新实验数据。声速测定的温度范围为（297-374）K，压力范围为（0.1-196.2）MPa。此外，还利用声学方法测定了这一范围内各自的密度。对于前两种物质，检测到了压力诱导凝固的影响。研究表明，采用基于压力波动理论的参数模型可以准确预测声速的高压数据，该模型只需要在环境大气压下测定的数据。反过来，也可以使用基于波动理论的状态方程（FT-EoS）来预测密度，其中包括等温非线性参数，该参数被认为与粒子间振荡的频率有关。这种相互依存关系通过与低频拉曼-克尔谱中相应峰值的对比分析得到了证实。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Fluid Phase Equilibria 工程技术-工程：化工

CiteScore

5.30

自引率

15.40%

发文量

223

审稿时长

53 days

期刊介绍： Fluid Phase Equilibria publishes high-quality papers dealing with experimental, theoretical, and applied research related to equilibrium and transport properties of fluids, solids, and interfaces. Subjects of interest include physical/phase and chemical equilibria; equilibrium and nonequilibrium thermophysical properties; fundamental thermodynamic relations; and stability. The systems central to the journal include pure substances and mixtures of organic and inorganic materials, including polymers, biochemicals, and surfactants with sufficient characterization of composition and purity for the results to be reproduced. Alloys are of interest only when thermodynamic studies are included, purely material studies will not be considered. In all cases, authors are expected to provide physical or chemical interpretations of the results. Experimental research can include measurements under all conditions of temperature, pressure, and composition, including critical and supercritical. Measurements are to be associated with systems and conditions of fundamental or applied interest, and may not be only a collection of routine data, such as physical property or solubility measurements at limited pressures and temperatures close to ambient, or surfactant studies focussed strictly on micellisation or micelle structure. Papers reporting common data must be accompanied by new physical insights and/or contemporary or new theory or techniques.