Dielectric properties of acetone—benzene solutions in a super-high frequency field and concentration fluctuations

Summary

• 1. Values of ∈' and ∈" for acetone—benzene solutions were determined over wide ranges of temperature and concentration at λ=3.21 cm.

• 2. Average macroscopic and average local values of the dielectric constant and loss are presented in the form of Cole curves.

• 3. The macroscopic relaxation times τ, characteristic dipole relaxation times τ^* and τ ^* _l , and the ratios of relaxation time to viscosity were calculated for various temperatures.

• 4. The free energies of activation ΔF, ΔFΔH _l , heats the activation of dipole relaxation ΔH, ΔH _l , and entropies of activation of dipole relaxation TΔS, TΔɛ _l were calculated.

• 5. Analysis of experimental data on dielectric constants and losses in acetone—benzene solutions in superhigh frequency fields shows that the hypothesis of molecular association of acetone in such solutions cannot account for all the experimental facts. Our experimental results are satisfactorily explained if the influence of concentration fluctuations on ∈' and ∈" is taken into consideration.