Abstract
Abstract The direct current ionic conductivity σdc of sixteen dipolar liquids having broad range of static permittivity (es ~ 2 to 170), and their binary mixtures with amides as one of the constituent over the entire composition range were investigated at 30 °C. It has been observed that the σdc values of pure dipolar liquids increase with the increase of their es values. The σdc values of the dipolar liquids having es value less than 50 are found in the range of 10− 5 to 10− 7 S/cm. Further an increase of two orders of magnitude in σdc is observed with the increase of es value from 50 to 170. Comparatively low σdc value of 1,4‐dioxane (3.06 × 10− 10 S/cm) is found due to its weak dipolar behaviour. The binary mixtures consisting of nearly equal ionic conductivity constituents show either a small deviation in their σdc values from the ideal behaviour or a linear behaviour with concentration variation. A significant deviation in σdc values from the ideality has been found for the binary mixtures when the mixture constituents have a difference of more than one order of magnitude in their pure liquid state ionic conductivities. It was revealed that the σdc values of such binary mixtures are governed by the constituent having high ionic conductivity over a broad composition range.
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