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首页> 外文OA文献 >Utilizing Infrared Spectroscopy to Analyze the Interfacial Structures of Ionic Liquids/Al2O3 and Ionic Liquids/Mica Mixtures under High Pressures
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Utilizing Infrared Spectroscopy to Analyze the Interfacial Structures of Ionic Liquids/Al2O3 and Ionic Liquids/Mica Mixtures under High Pressures

机译：利用红外光谱分析高压下离子液体/ Al2O3和离子液体/云母混合物的界面结构

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摘要

The interfacial interactions between ionic liquids (1,3-dimethylimidazolium methyl sulfate and 1-ethyl-3-methylimidazolium trifluoromethanesulfonate) and solid surfaces (mesoporous aluminum oxide and mica) have been studied by infrared spectroscopy at high pressures (up to 2.5 GPa). Under ambient pressure, the spectroscopic features of pure ionic liquids and mixtures of ionic liquids/solid particles (Al2O3 and mica) are similar. As the pressure is increased, the cooperative effect in the local structure of pure 1,3-dimethylimidazolium methyl sulfate becomes significantly enhanced as the imidazolium C–H absorptions of the ionic liquid are red-shifted. However, this pressure-enhanced effect is reduced by adding the solid particles (Al2O3 and mica) to 1,3-dimethylimidazolium methyl sulfate. Although high-pressure IR can detect the interactions between 1,3-dimethylimidazolium methyl sulfate and particle surfaces, the difference in the interfacial interactions in the mixtures of Al2O3 and mica is not clear. By changing the type of ionic liquid to 1-ethyl-3-methylimidazolium trifluoromethanesulfonate, the interfacial interactions become more sensitive to the type of solid surfaces. The mica particles in the mixture perturb the local structure of 1-ethyl-3-methylimidazolium trifluoromethanesulfonate under high pressures, forcing 1-ethyl-3-methylimidazolium trifluoromethanesulfonate to form into an isolated structure. For Al2O3, 1-ethyl-3-methylimidazolium trifluoromethanesulfonate tends to form an associated structure under high pressures.
机译：通过在高压下（高达2.5GPa）的红外光谱研究已经研究了离子液体（1,3-二甲基咪唑甲基硫酸铵和三乙酰-3-甲基咪唑三氟甲磺酸铵）和固体表面（中孔氧化铝和云母）之间的界面相互作用。在环境压力下，纯离子液体的光谱特征和离子液体/固体颗粒（Al2O3和云母）的混合物是相似的。随着压力的增加，随着离子液体的咪唑鎓C-H吸收是红移的，纯1,3-二甲基咪唑甲基硫酸铵的局部结构中的协作效果明显增强。然而，通过将固体颗粒（Al 2 O 3和云母）加入1,3-二甲基咪唑鎓甲基硫酸盐来降低这种压力增强的效果。虽然高压IR可以检测1,3-二甲基咪唑甲基硫酸甲硫酸甲酯和颗粒表面之间的相互作用，但Al 2 O 3和云母混合物中的界面相互作用的差异尚不清楚。通过将离子液体的类型改变为1-乙基-3-甲基咪唑鎓三氟甲磺酸盐，界面相互作用对固体表面的类型变得更敏感。混合物中的云母颗粒在高压下扰动1-乙基-3-甲基咪唑三氟甲磺酸盐的局部结构，迫使三乙基-3-甲基咪唑三氟甲磺酸盐形成以形成分离的结构。对于Al 2 O 3，1-乙基-3-甲基咪唑鎓三氟甲磺酸铵倾向于在高压下形成相关的结构。

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