支持されたイオン液体膜における室温イオン液体のダイナミクス: 2D IRと極化IRポンププローブ実験
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
まとめ
サポートされたイオン液体膜 (SILM) は,散発液体よりも遅い動態を示し,炭素捕獲における使用に影響を与えます. これらの発見は,大量液体試験がSILMの性能を予測できないことを示唆しています.
科学分野:
- 材料科学
- 物理化学
- 化学工学
背景:
- サポートされたイオン液体膜 (SILM) は,炭素を捕獲するための高度な材料です.
- SILM内のイオン性液体のダイナミクスを理解することは,その性能を最適化するために不可欠です.
研究 の 目的:
- ポリエーテルスルフォン (PES) 膜におけるSeCN-アニオンと1-エチル-3-メチルリミダゾリウムビス ((Trifluoromethylsulfonyl) imide (EmimNTf2) の方向転換とスペクトル拡散のダイナミクスを調査する.
- SILM の動態と EmimNTf2 の動態を比較する
主な方法:
- 2次元赤外線 (2D IR) と偏光選択型赤外線ポンププローブ (PSPP) のスペクトロスコーピーを利用した.
- 孔のサイズが異なるポリエーテル硫 (PES) 膜 (PES200とPES30) のSeCN-アニオンダイナミクスを調査した.
- SILMと室温イオン液体 (RTIL) EmimNTf2のダイナミクスの比較
主要な成果:
- SeCNとRTILの構造的な変動の方向転換は,散発液体と比較してSILMにおいて著しく遅かった.
- 完全指向ランダム化時間は136 ps (大量) から513 ps (PES30) に増加した.
- 最も遅い構造的スペクトル拡散 (SSD) 崩壊定数は140 ps (総量) から504 ps (PES200) と1660 ps (PES30) に増加した.
結論:
- SILMのインターフェイス効果は,直接のインターフェイスを超えてRTILの構造的動態を大幅に変化させます.
- 大量RTILの性質は,炭素キャプチャアプリケーションのSILM内の動作の信頼性の高い予測ではありません.
- この変化した動態を理解し,SILMの設計を改善するためにさらなる研究が必要です.
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