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2次元赤外線スペクトロスコピーで調査されたAOTラメラの内部におけるダイナミクス
S K Karthick Kumar1, A Tamimi, Michael D Fayer
1Department of Chemistry, Stanford University , Stanford, California 94305, United States.
Journal of the American Chemical Society
|March 8, 2013
まとめ
超高速光譜を用いたエアロゾール-OT (AOT) 水混合物の調査は,液体環境と比較して,秩序付けられた相における明確な分子ダイナミクスを明らかにします. これらのダイナミクスは,水分濃度によって影響を受け,探査分子に影響を及ぼします.
科学分野:
- 物理化学 物理化学
- マテリアルサイエンス 材料科学
- スペクトル顕微鏡検査です.
背景:
- エアロゾール-OT (AOT) は水と複雑なメソフェーズを形成し,様々な用途に不可欠です.
- これらの組織化された構造の中の分子動態を理解することは,それらの性質を制御する鍵です.
研究 の 目的:
- AOT/水混合物の有機領域内の超高速ダイナミクスを調査する.
- 非イオン同位体 (EHS) とのラメラーと二連続立方体 (BC) 段階のダイナミクスを比較する.
- 分子運動に対する水分化の影響を決定する.
主な方法:
- 超高速二次元赤外線 (2D IR) 振動エコースペクトロスコーピー.
- 赤外線 (IR) ポンプ・プローブ実験では,振動プローブとしてボルンガム・ヘキサカルボニル (W(CO) 6) を使用した.
- 周波数-周波数相関関数 (FFCF) によるスペクトル拡散の分析.
主要な成果:
- AOT・ラメラー・フェーズとBC・フェーズにおけるFFCFは,ビクエポネンショナルの衰退を示している (速い~12.5ps,遅い~150ps).
- オーダーされたAOTフェーズのダイナミクスは,液体EHSアナログ (速い~5ps,遅い~80ps) よりも著しく遅い.
- AOTのラメラー相における水分化の増加は,W (((CO) 6.6の振動寿命の減少につながります.
結論:
- AOTメソフェーズにおける分子動態は,非イオン性液体とは異なる.
- 水分レベルは,AOTの構造内の地元の環境とダイナミクスを調節する役割を果たします.
- この研究は,表面活性物質のメソフェーズの構造的進化とダイナミクスの洞察を提供します.
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