Nanoscale Structural Phase Transitions in Aqueous Solutions of Organic Molecules

Adiabatic compressibility βS of the 4-methylpyridine + water solution is investigated in a wide concentration and temperature variation interval using Mandelstam–Brillouin scattering spectroscopy. The adiabatic minimum caused by microinhomogeneous structure experimentally established at 0.06 molar fractions solution. results investigations allow construction diagram possible states continuous three-dimensional hydrogen bond network water. experimental study excessive hypersound absorption acetone 3-methylpyridine solutions are discussed based on conclusions theory high-frequency sound near critical point (developed Chaban) Landau theory. These described within framework Chaban theories explained existence two different with thermodynamic stability