Applied Surface Science, Vol.422, 475-481, 2017
HCl, KCl and KOH solvation resolved solute-solvent interactions and solution surface stress
An incorporation of the hydrogen bond (O:H-O or HB) cooperativity notion, contact angle detection, and the differential phonon spectrometrics (DPS) has enabled us to gain refined information on the HCl, KCl and KOH solvation resolved solute-solvent molecular interactions and the solution surface stresses. Results show that ionic polarization stiffens the solvent H-O bond phonon from 3200 to 3480 cm(-1) in the hydration shells. The HO- in alkaline solution, however, shares not only the same H-O phonon redshift of compressed water from 3200 to < 3100 cm(-1) but also the dangling bonds of H2O surface featured at 3610 cm(-1). Salt and alkaline solvation enhances the solution surface stress by K+ and Cl(-)ionic polarization. The excessive H+ proton in acid solution forms a H <-> H anti-HB that depresses the solution surface stress, instead. The solute capability of transforming the fraction of the O:H-O bonds of the solvent matrix is featured by: f(H) = 0 and f(x) alpha 1-exp(-C/C-0) (x = HO-, K+ and Cl-) towards saturation. Exercises not only confirm the presence of the H < > H anti-HB point fragilization, the O:double left right arrow:O super-HB point compression, and ionic polarization dominating the performance of the respective HCl, KOH, and KCl solutions, but also demonstrate the power of the DPS that enables high resolution of solute-solute-solvent interactions and correlation between HB relaxation and solution surface stress. (C) 2017 Elsevier B.V. All rights reserved.