Structure of liquid mixtures studied by positron annihilation and sound velocity: Water+tert-butanol

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 structure of solution, especially formation of clathrate-like hydrates. The annihilation method was found to be applicable for investigating the structure of aqueous solutions of non-electrolytes. Resolution of annihilation spectrum into three components (instead of two) yield non-physical parameters, suggesting that the short-lived mechanisms of annihilation of positrons are too close to be separated.