title: Hydration of alcohol clusters in 1-propanol-water mixture studied by quasielastic neutron scattering and an interpretation of anomalous excess partial molar volume.
abstract: Quasielastic neutron scattering measurements have been made for 1-propanol-water mixtures in a range of alcohol concentration from 0.0 to 0.167 in mole fraction at 25 degrees C. Fraction alpha of water molecules hydrated to fractal surface of alcohol clusters in 1-propanol-water mixture was obtained as a function of alcohol concentration. Average hydration number N(ws) of 1-propanol molecule is derived from the value of alpha as a function of alcohol concentration. By extrapolating N(ws) to infinite dilution, we obtain values of 12-13 as hydration number of isolated 1-propanol molecule. A simple interpretation of structural origin of anomalous excess partial molar volume of water is proposed and as a result a simple equation for the excess partial molar volume is deduced in terms of alpha. Calculated values of the excess partial molar volumes of water and 1-propanol and the excess molar volume of the mixture are in good agreement with experimental values.
authors.affiliation: Institute of Science and Technology, Niigata University, Niigata 950-2181, Japan. misawa@chem.sc.niigata-u.ac.jp
authors.forename: M
authors.initials: M
authors.lastname: Misawa
authors.forename: Y
authors.initials: Y
authors.lastname: Inamura
authors.forename: D
authors.initials: D
authors.lastname: Hosaka
authors.forename: O
authors.initials: O
authors.lastname: Yamamuro