Water dynamics at the interface in AOT reverse micelles.
Water dynamics at the interface in AOT reverse micelles.
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DOI：
10.1021/jp902004r
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发表时间：
2009-06-25
期刊：
影响因子：
--
通讯作者：
Fayer MD
中科院分区：
文献类型：
--
作者：
Moilanen DE;Fenn EE;Wong D;Fayer MD
利用超快红外光谱研究了大气溶胶- ot （AOT）反胶束中水分子在界面处的取向动力学。在大的反胶束（直径约9纳米或更大）中，大量的纳米级水离界面足够远，从而显示出块状特征。然而，一些水分子与界面相互作用，具有不同于一般水的振动吸收光谱和动力学。这些界面水的不同特征使得它们对数据的贡献可以从整体中分离出来。对OD拉伸的红外吸收光谱进行了分析，发现界面水分子的光谱峰在2565 cm−1附近，而体积水分子的光谱峰在2509 cm−1附近。建立了一个双分量模型，该模型同时描述了界面水光谱区OD拉伸的种群松弛和取向动力学。该模型提供了两种观测值的一致描述，并证明了与界面相互作用的水具有较慢的振动松弛和取向动力学。界面水分子的取向弛豫发生在18±3ps，而体积水的弛豫值为2.6 ps。
The orientational dynamics of water molecules at the interface in large Aerosol-OT (AOT) reverse micelles are investigated using ultrafast infrared spectroscopy of the OD stretch of dilute HOD in H2O. In large reverse micelles(~9 nm diameter or larger), a significant amount of the nanoscopic water is sufficiently distant from the interface that it displays bulk-like characteristics. However, some water molecules interact with the interface and have vibrational absorption spectra and dynamics distinct from bulk water. The different characteristics of these interfacial waters allow their contribution to the data to be separated from the bulk. The infrared absorption spectrum of the OD stretch is analyzed to show that the interfacial water molecules have a spectrum that peaks near 2565 cm−1 in contrast to 2509 cm−1 in bulk water. A two component model is developed that simultaneously describes the population relaxation and orientational dynamics of the OD stretch in the spectral region of the interfacial water. The model provides a consistent description of both observables and demonstrates that water interacting with the interface has slower vibrational relaxation and orientational dynamics. The orientational relaxation of interfacial water molecules occurs in 18 ± 3 ps in contrast to the bulk water value of 2.6 ps.
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影响因子：
56.9
作者：
Laage, D;Hynes, JT
通讯作者：
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影响因子：
4.4
作者：
Asbury, JB;Steinel, T;Fayer, MD
通讯作者：
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影响因子：
3.3
作者：
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通讯作者：
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影响因子：
8.6
作者：
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通讯作者：
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DOI：
10.1073/pnas.0603239103
发表时间：
2006-10-17
影响因子：
11.1
作者：
Dokter, Adriaan M.;Woutersen, Sander;Bakker, Huib J.
通讯作者：
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