Molecular structure and adsorption of dimethyl sulfoxide at the surface of aqueous solutions

Article Abstract:

Dimethyl sulfoxide (DMSO) is examined at the solution surface by means of surface vibrational sum frequency generation spectroscopy. In the spectral region examined, the DMSO methyl symmetric stretch from surface DMSO gradually blue shifts with decreasing DMSO concentration. The blue shift is correlated with a destabilization of the sulfur-CH electronic interaction with decreasing surface concentration. Observations of surface tension data show that surface partitioning of DMSO in water clearly occurs over all concentration ranges.

Measurement, Adsorption, Dimethyl sulfoxide, Surface tension

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Probing the structure of water molecules at an oil/water interface in the presence of a charged soluble surfactant through isotopic dilution studies

Article Abstract:

The structure of water molecules in an oil/water interface was examined through vibrational sum frequency generation techniques in the presence of a charged soluble surfactant. Stretched hydroxide modes were used as samples for the study. Further analysis revealed that ice-like molecules were more predominant in the samples and were arranged in a tetrahedral fashion. This was attributed to the influence of the nonpolar oil phase on the interfacial water molecules whether in the presence or absence of charged soluble surfactants.

Surface active agents, Surface chemistry, Hydroxides, Water analysis

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Investigations of the structure and hydrogen bonding of water molecules at liquid surfaces by vibrational sum frequency spectroscopy

Article Abstract:

The structure and hydrogen bonding of water molecules at liquid surfaces was studied using vibrational sum frequency spectroscopy. Results showed that the structure and hydrogen bonding of water molecules at the neat air/water interface are significantly different than those of the CCl4/water interface. The neat air/water interface contains contributions from OH peaks, while the CCl4/water interface contains only the OH-SS-S peak.

Hydrogen bonding, Hydrogen bonds

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