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- W2065532052 startingPage "506208" @default.
- W2065532052 abstract "Solvation of ions in a liquid tends to reduce the extent of intermolecular hydrogen bonding. This changes the effective dipolar orientation correlation factor, g, in most alcohols and in water, and hence the equilibrium permittivity εs, but not the relaxation time, τ. An increase in temperature has a similar effect on εs, but the relaxation time also decreases. Here we study the dielectric relaxation spectra of two concentrations of LiClO4 solutions in 5-methyl-2-hexanol, and compare the findings against those for the pure liquid. We also compare the effect of the ions against that observed in a similar study of 1-propanol (Power et al 2002 J. Chem. Phys. 116 4192). εs decreases by ∼7% on adding 1 mol% LiClO4 at 173 K but increases by ∼12% at 223 K, and there is similar change in the strength of the Debye relaxation process. This may occur partly as a result of the changing ion–ion pair equilibrium with temperature. Initial addition of LiClO4 (0.5 mol% solution) increases the dc conductivity, σdc, far more than further addition. The addition of electrolyte also causes the slowest relaxation to depart from the Debye process, but its characteristic relaxation rate does not change. Variation in σdc with τ does not follow the Debye–Stokes–Einstein relation for either the pure liquid or the LiClO4 solutions, which indicates that diffusion of ions does not follow the Brownian diffusion of molecules." @default.
- W2065532052 created "2016-06-24" @default.
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- W2065532052 date "2007-11-19" @default.
- W2065532052 modified "2023-09-27" @default.
- W2065532052 title "The effect of ions on the permittivity and dielectric relaxation of an uncrystallizable heptanol" @default.
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- W2065532052 doi "https://doi.org/10.1088/0953-8984/19/50/506208" @default.
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