Influence of water on the orientation of cations at the surface of a room-temperature ionic liquid: A sum frequency generation vibrational spectroscopic study

Article Abstract:

Sum frequency generation vibrational spectroscopy is used to determine the orientation of the cations in a room-temperature ionic liquid at the air-liquid interface. The ionic liquid studied was 1-butyl-3-methylimidazolium bis-triflouromethylsulfonimade, [BMIM](super +)[imide](super -). At water pressures below 10(super -4) Torr, the imidazolium ring was oriented parallel to the surface plane.

Thermal properties, Ionic solutions, Vibrational spectra

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Very small bubble formation at the solid-water interface

Article Abstract:

The formation of very small gas bubbles at structured solid-water interfaces is studied using the tapping mode atomic force microscopy imaging technique (TMAFM). Bubbles formed on rough, methylated surfaces were larger and less densely distributed than those on a smooth surface of a similar hydrophobicity. The process of bubble coalescence was observed as a function of time.

Atomic force microscopy, Bubbles

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A kinetic study of the reactions of sulfate radicals at the silica nanoparticle-water interface

Article Abstract:

Sulfate radicals, SO4(super .-), are generated using flash photolysis of aqueous S2O(sub 8)(super 2- ) solutions and the reactions of the inorganic radicals with the surface of suspended silica nanoparticles (NP) investigated. A kinetic analysis of the experimental results indicates that SO4(super .-) radicals are absorbed on the NP surface.

Sulfates, Aqueous solution reactions, Photolysis

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