Positron annihilation in and compressibility of liquid water plus tert-butyl alcohol mixtures

Aqueous solutions of tert-butyl alcohol (2-methyl-2-propanol) were investigated using sound velocity and positron annihilation methods. The results are interpreted in terms of changing the structure of the solution, especially the formation of clathrate-like hydrates. The annihilation method was found to be applicable for investigating the structure of aqueous solutions of nonelectrolytes; the lifetime and intensity of the long-lived component of the annihilation spectrum were found to be sensitive for structural rearrangements in liquid.