Depolarized Rayleigh scattering by nitrobenzene in binary and ternary combination with acetone and isopropanol

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Ultraviolet Spectra, Brillouin And Rayleigh Scattering, Other Light Scattering

Scientific paper

The depolarized Rayleigh linewidth Γ, integrated depolarized scattering intensity Io, and viscosity ɛ of solutions of nitrobenzene in acetone and isopropanol were studied as a function of temperature at different nitrobenzene concentrations. In all systems studied Γ-1 is linear in (ɛ/T). The extrapolated value of Γ-1 at ɛ/T-->0 is zero for the interactive solvents which we studied. Relative intensity measurements indicate that Io does not depend strongly on temperature. Comparison is made with the studies of Alms et al. [J. Chem. Phys. 59, 5310 (1973)] on Γ for nitrobenzene in nonpolar solvents. From these and associated studies it appears that in nonpolar solvents a ''slip'' hydrodynamic model is applicable, but in polar solvents the appropriate boundary conditions are closer to ''stick'' and vary from solvent to solvent.

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