支持的离子液体膜中的室温离子液体的动力学:二维IR和极化IR探测实验
Jae Yoon Shin1, Steven A Yamada1, Michael D Fayer1
1Department of Chemistry, Stanford University , Stanford, California 94305, United States.
Journal of the American Chemical Society
|December 16, 2016
概括
支持的离子液体膜 (SILM) 比散装液体具有较慢的动态,这影响了它们在碳捕获中的使用. 这些发现表明大量液体研究可能无法预测SILM的性能.
科学领域:
- 材料科学
- 物理化学
- 化学工程
背景情况:
- 支持的离子液体膜 (SILM) 是碳捕获的先进材料.
- 了解SILM中离子液体的动态对于优化其性能至关重要.
研究的目的:
- 在聚硫 (PES) 膜中研究SeCN- anion和1-ethyl-3-methylimidazolium bis (三甲) 胺 (EmimNTf2) 的重定向和光谱扩散的动力学.
- 将SILM中的动态与EmimNTf2中的动态进行比较.
主要方法:
- 使用二维红外 (2D IR) 和偏振选择性红外探针 (PSPP) 光谱.
- 在多硫 (PES) 膜 (PES200和PES30) 中研究了SeCN- anion动力学.
- 在SILM与室温离子液体 (RTIL) EmimNTf2中的比较动态.
主要成果:
- 与散装液体相比,SILM 的结构波动明显较慢.
- 完全定向随机化时间从136 ps (批量) 增加到513 ps (PES30).
- 最慢的结构光谱扩散 (SSD) 衰变常数从140 ps (批量) 增加到504 ps (PES200) 和1660 ps (PES30).
结论:
- 在SILM中,接口效应大大改变了RTIL的结构动态,超越了直接的接口.
- 在碳捕获应用中,批量RTIL属性不是它们在SILM中的行为可靠的预测指标.
- 需要进一步的研究来理解和利用这些变化的动态来改进SILM设计.
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