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サイズ選択された水性ナノドロップのイオン:水分子の連続結合エネルギーと,イオン光に水の影響
William A Donald1, Ryan D Leib, Maria Demireva
1Department of Chemistry, University of California, Berkeley, California 94720-1460, USA.
Journal of the American Chemical Society
|October 18, 2011
まとめ
水を調査する.
科学分野:
- 物理化学 物理化学
- スペクトル顕微鏡検査です.
- ナノテクノロジー ナノテクノロジー
背景:
- イオン水分化の理解は,様々な化学的,生物学的プロセスにおいて極めて重要です.
- イオンの光物理的性質は,周囲の溶媒分子によって著しく影響を受けます.
- 以前の研究では,イオンと水の相互作用が調査されていますが,制御されたナノドロップレットにおける結合エネルギーの直接的な測定は困難です.
研究 の 目的:
- 水がイオン光に及ぼす影響を調査する.
- ナノドロップの水素イオンへの平均連続水分子結合エネルギーを測定する.
- ナノドロップの光物理的性質が,大量溶液の光物理的性質を模倣するかどうかを判断する.
主な方法:
- イオンナノカロメトリーは結合エネルギーを測定するために使用されました.
- 特定のイオン (ロダミン染料,Ce(3+),TrpH(+),[KYK + 2H](2+)) と水分子を含んだナノドロップが作成されました.
- 光を誘発するために248nmの興奮が用いられ,放射波長が記録された.
主要な成果:
- ナノドロップのロダミン染料とCe ((3+) は,大量溶液に似た光を示した.
- 光量子収量は,ナノドロップのイオンに対して,≥8個の水分子を含有して,~1に近づきました.
- 水酸化イオンの平均連続水分子結合エネルギーが決定され,TrpH ((+) と[KYK + 2H] ((2+) の非対称値に近付いた.
結論:
- ナノドロップのイオンの光物理的性質は,比較的小さなクラスターサイズの完全に水素化されたイオンの性質に近い.
- イオンナノカロメトリーは,イオン-水相互作用と結合エネルギーを研究するための敏感な方法を提供します.
- これらの発見は,これらの制御されたナノドロップレット環境における水の液体のような構造を示唆しています.
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