二元离子液体混合物的宏观表面张力和微观表面成分与不同大小的常见离子和离子的相关性
Ziwen Zhai1, Jade Barreto2, Daniel Hemmeter2
1Institute of Advanced Optical Technologies─Thermophysical Properties (AOT-TP), Department of Chemical and Biological Engineering (CBI) and Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Paul-Gordan-Straße 8, 91052 Erlangen, Germany.
The journal of physical chemistry. B
|February 27, 2025
概括
二元离子液体混合物表现出表面较大的离子的优先丰富,显著影响表面张力. 一个针对阴离子大小的改进模型准确地预测了这些表面特性.
科学领域:
- 物理化学 物理化学
- 材料科学 材料科学 材料科学
- 表面科学是一门学科.
背景情况:
- 离子液体 (ILs) 是具有独特性质的可调节溶剂.
- 了解IL混合物的表面行为对于它们的应用至关重要.
- 二元IL混合物与常见的离子,但不同的离子呈现复杂的界面现象.
研究的目的:
- 为了研究二元离子液体混合物的表面张力和表面成分.
- 了解批量组成和界面行为之间的关系.
- 根据分子性质开发一个改进的模型来预测表面张力.
主要方法:
- 吊降测量 (PD) 用于在不同温度下确定表面张力.
- 用角度分辨率光电子光谱学 (ARXPS) 来分析超高真空下的表面组成.
- 研究了1 - 乙基-3 - 甲基利米达酸盐和1 - 乙基-3 - 甲基利米达 bis ((三甲基硫) 胺的二元混合物.
主要成果:
- 在真空-液体接口上,ARXPS揭示了较大的[C2C1Im][Tf2N]组件的强烈偏好的丰富.
- 表面张力明显低于线性混合模型预测的水平.
- 结合IL所占地面积的新模型准确地预测了1.4%的实验表面张力.
结论:
- 阳离子的大小和化学结构强烈影响IL混合物的表面成分和张力.
- 优选IL组件的表面丰富是偏离理想混合行为的一个关键因素.
- 开发的模型通过考虑分子尺寸,可以更准确地预测IL混合物的表面张力.
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