Ultrafast dynamics of water–AOT–octane microemulsions

Patzlaff, T.; Janich, Martin A.; Seifert, G.; Graener, H.

doi:10.1016/s0301-0104(00)00287-1

Cited by 37 publications

(39 citation statements)

References 31 publications

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“…This partitioning of water molecules into two sub-ensembles makes the reverse micelle an excellent model for interfacial water (in small, d = 1 nm micelles the fraction of border-effected water is more than 80%) and almost bulk-like water (in large d = 10 nm diameter micelles the fraction of core water approaches 90%). The separation of water into two sub-ensembles is also supported by the results of previous IR nonlinear experiments on the reverse micelles; 38,39,43,44,[52][53][54] however, some deviations from the core-shell model have also been reported. 55,56 Earlier studies of water vibrational dynamics in AOT reverse micelles 38,39 were focused on verifying the core-shell model in the case of H 2 O molecules where OH stretches are strongly coupled.…”

Section: Introductionsupporting

confidence: 76%

Reduced coupling of water molecules near the surface of reverse micelles

Bakulin

Pshenichnikov

2011

Phys. Chem. Chem. Phys.

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Section: Introductionsupporting

confidence: 76%

Reduced coupling of water molecules near the surface of reverse micelles

Bakulin

Pshenichnikov

2011

Phys. Chem. Chem. Phys.

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“…In the only other reported ultrafast IR studies on RMs, Graener and co-workers 60,61 have investigated the transient spectra in the OH stretching region of water following IR excitation in that spectral region in AOT RMs. Their result is different from those typically observed because they find that the relaxation time is shorter for smaller micelles.…”

Section: A Ver and Other Dynamics In Reverse Micellesmentioning

confidence: 99%

Vibrational energy relaxation of aqueous azide ion confined in reverse micelles

Zhong

Baronavski

Owrutsky

2003

The Journal of Chemical Physics

114

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Vibrational energy relaxation (VER) times have been measured by ultrafast infrared spectroscopy near 2000 cm−1 for the antisymmetric stretching ν3 band of azide ion in water pools of nonionic reverse micelles (RM). The water pool radii were varied in the 1–3 nm range by adjusting the water-to-surfactant molar ratio, ω=[H2O]/[surfactant]. Compared to the value measured in this work for bulk water (0.81±0.06 ps), the VER decay times are about three times longer (2.5±0.2 ps) for the smallest RM studied (ω=1) and become shorter with increasing ω and RM size but do not reach the bulk value at the largest ω studied. Solvent shifts of the azide vibrational band in RMs have been previously reported [Langmuir 18, 7401 (2002)], and in a manner similar to the VER rates, tend toward the bulk water value with increasing ω. Studies of the VER dynamics of azide ion in RMs are used to investigate confinement effects on solvation and to explore the effects of continuously modifying the solute–solvent interaction by varying ω in the RMs.

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“…Recently, various treatments have been used to infer water intermolecular interactions and structure from the shape of the water OH band and its dependence on reverse micelle radius, e.g. Gaussian sub-band analysis [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] and time-resolved IR spectroscopy [18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%