8th Liquid Matter Conference September 6-10, 2011 Wien, Austria ...

P2.24Tue 611:23-14:00Study of supramolecular structures in aqueous solutionsof diolsZiyoyev Gafurdjan 1 and Mirzaev Sirojiddin 11 Heat Physics Department, Uzbek Academy of Sciences, Katartal 28, 100135, Tashkent,UzbekistanWe have studied sound attenuation in solutions 2, 3-butandiole-water and 2, 3-dimethylbutandiole-2, 3-water in order obtain direct information about kinetics of supramolecular structures. At theconcentration of diols 0.1 mol fractions were found relaxation process characterizing formationof pseudo-clathrate structures. Such structures in which the hydrophobic part of guest moleculesenclathrated in almost spherical cavities in ice-like lattices made up of hydrogen-bonded watermolecules and hydroxyl group of guest molecules participate in formation of hydrogen latticeshave been named pseudo-clathrate structure. Diol molecule is one of a few guests that formpseudo-clathrate structure in aqueous solutions. Characteristic relaxation time and effective energyof activation of the process monotonically decrease with reducing diol concentration up to0.1 mol fraction in solution. Properties of aqueous solution of nonelectrolytes, which stabilizethe structure of water in molecular scale, are a key point for obtaining long-life gaseous clathrateallow us understand formation of clathrate on molecular level and develop new model approach.The work has been supported by Grant FA-F082 Academy of Sciences of Uzbekistan.24