Abstract
Surface tension and Raman spectra containing hydrogen bonding in acetonitrile aqueous solutions with different mole ratios were obtained. Varied surface tension and hydrogen bonding in the mixed solution were discussed. For this purpose, the OH stretching bands were fitted into three Gaussian components to which different hydrogen-bonded water samples were assigned. Furthermore, the microstructures of binary solution were analyzed. The results indicated that the surface tension decreases dramatically with the enhancement of hydrogen bonds in the mixture. A spectroscopic method for studying the macroscopic properties of aqueous solutions was employed. The direct experiment results provided the relationship between surface tension and microstructure in aqueous solutions.
Highlights
Water, as the most common solvent, is widely used in the chemistry, biology, medicine, and life sciences [1,2,3,4,5]
It was similar to the ice with a complex structure [11]. e interaction of hydrogen bonds in mixture increased the solubility of the solute [12, 13]. e results indicated that the DMSO aqueous solution with the antifreeze effect was better than pure DMSO solutions [14]
Surface tension is a kind of physical phenomenon that is limited to the special stress state between thin layers of liquid surface, which is a representation of intermolecular force
Summary
As the most common solvent, is widely used in the chemistry, biology, medicine, and life sciences [1,2,3,4,5]. It was found that water is the simple substance with peculiar physical and chemical properties, the density in solid water was brought being smaller than it in liquid water [5] It is the change of water substructure that distinguished from the metallic and nonmetallic materials due to the change of water substructure from the structure of chain and/or cyclic annular to a stable three-dimensional network structure in the transformation of state through hydrogen-bonding interaction. It is of great significance to study the effect of intermolecular microinteraction on surface tension for understanding surface tension and its applications Meantime, it made us take intense interest because macroscopic properties were affected by the microcosmic interaction of hydrogen bonds in aqueous solutions. A Gauss deconvolution method was used to fit the Raman peak of the OH bond in the acetonitrile-water binary aqueous solution, and the change in the solution structure resulting from the interaction in the mixture and surface tension was discussed. An attempt which is relevant to the basic experimental data for studying the relationship between microstructure and macroscopic properties of aqueous solutions can be taken
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