Comparison of shear and dielectrics in highly viscous liquids
Abstract
A relation between shear and dielectric spectra is derived for highly viscous liquids with a small rotational contribution ε to the dielectric constant. It is valid if the shear fluctuations and the electric dipole fluctuations have the same spectrum. The comparison to literature data, taken under carefully controlled conditions to ensure samples from the same charge and the same temperature control in both measurements, indicates that the relation may be fulfilled or not depending on the substance. The connection to recent work on strong correlations is discussed.
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