Nanoscale Structural Phase Transitions in Aqueous Solutions of Organic Molecules

Author:

Bunkin Nikolai1ORCID,Sabirov Leonard2,Semenov Denis2ORCID,Ismailov Faxriddin2,Khasanov Muxriddin2

Affiliation:

1. Department of Fundamental Sciences, Bauman Moscow State Technical University, Moscow 105005, Russia

2. Institute of Engineering Physics, Samarkand State University, Samarkand 140104, Uzbekistan

Abstract

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

Publisher

MDPI AG

Subject

Condensed Matter Physics,Electronic, Optical and Magnetic Materials

Reference35 articles.

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5. Distinctive features of the phase diagram of a glycerin-quaiacol solution;Krivokhizha;JETP Lett.,1994

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