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Light Scattering m Binary Liquid Mixtures. II. Anisotropic Scattering

Gj. Deželić ; Andrija Stampar School of Public Health, Medical Faculty, University of Zagreb
N. Šegudović ; Department of Physical Chemistry, Institute »Ruder Boskovic«, 41000 Zagreb, Croatia, Yugoslavia

Sažetak

Anisotropic light scattering in liquid mixtures of small nonelectrolyte
molecules was measured at the wavelengths 546 and 436
nm. The mixtures of cyclohexane, n-heptane and carbon tetrachloride
(component 1) with benzene and carbon disulfide (component 2)
were examined. The optical anisotropy terms were determined from
experimental data and their concentration dependence was analysed.
So was validity of the additivity principle of optical anisotropy.
It has been concluded that deviation from linearity of the
effective molecular anisotropy plots indicates changes in the orientational
correlations of molecules in mixtures. By analysing the
excess thermodynamic functions of the same mixtures it has been
concluded that such plots describe molecular interactions and thek
changes in dependence of concentration. Existing theoretical formulae
in which orientational correlations effects have been considered,
are discussed. It is emphasized that the parameters needed
are concentration dependent and that explanation of their physical
meaning is not possible at present. In testing methods for determining
molecular anisotropies of isolated molecules based on the
determination at infinite dilution it has been found that the intermolecular interactions between solute and solvent molecules, if the
molecules are of comparable size, are always so strong that the
anisotropy of isolated molecules cannot be determined by such
methods.

Ključne riječi

Hrčak ID:

197036

URI

https://hrcak.srce.hr/197036

Datum izdavanja:

30.6.1973.

Posjeta: 728 *