Wydział Chemii

Kazimierz Jerie

Andrzej Baranowski

Stan Koziol

Jacek Gliński

Andrzej Burakowski

2005

Chemical Physics

309

277-282

10.1016/j.chemphys.2004.09.015

Naukowa

Angielski

Artykuł

We report the results of acoustic and positron annihilation measurements in aqueous solutions of acetonitrile (CH₃CN). Hydrophobicity of the solute is discussed, as well as the possibility of describing the title system in terms of hydrophobic solvation. A new method of calculating the “ideal” positronium lifetimes is proposed, based on the mean volume of cavities (holes) in liquid structure available for positronium pseudoatom. The results are almost identical with those obtained from molar volumes using the concept of Levay et al. On the other hand, the same calculations performed using the “bubble” model of annihilation yield very different results. It seems that either acetonitrile forms with water clathrate-like hydrates of untypical architecture, or it is too weak hydrophobic agent to form clathrate-like hydrates at all. The former interpretation seems to be more probable.

Water, Aqueous solutions, Acetonitrile, Hydrophobic solvation, Hydration, Sound velocity, Density, Positron annihilation

https://doi.org/10.1016/j.chemphys.2004.09.015

http://www.elsevier.com