Mobility of thermal cations in liquids of n-alkanes, n-pentane to n-tetradecane: effect of viscosity and comparison to neutral molecule diffusion

Abstract

The cation mobility μ+ was measured in n-pentane at 295 K and in n-C6 to C11 and n-C14 alkanes from ~295 K to their normal boiling points. The dependence on viscosity [Formula: see text] was reexamined and the best fit occurred with p = 1.0. The ratio of diffusion coefficients of neutral molecules to analogous cations was ~3 because of the stronger interaction of ions with the fluid molecules (electrostriction). The dependence of μ+ on free volume is illustrated. Keywords: thermal cation mobility, n-alkane solvents, viscosity effects