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

Abstract

. Can. 3. Chem. 67, 27 (1989).The cation mobility p + was measured in n-pentane at 295 K and in n-C6 to C,, and n-CI4 alkanes from -295 K to their normal boiling points. The dependence on viscosity p + a q-P was reexamined and the best fit occurred with p = 1 .O. 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 p + on free volume is illustrated.Key words: thermal cation mobility, n-alkane solvents, viscosity effects NORMAN GEE et GORDON R. FREEMAN. Can. 3. Chem. 67, 27 (1989).OpCrant dans le pentane 21 295 K de mCme que dans les alcanes n-C6 21 Cl et n-C14 de 295 K jusqu'h leurs points d'tbullition normaux, on a mesurC les mobilitC cationiques p + . On a rttvaluC la relation qui existe entre p + et q -P et on a dttermine que la meilleure corrtlation se produit lorsque p = 1 ,O. Le rapport des coefficients de diffusion des molCcules neutres et ceux des cations analogues est d'environ 3; ce fait est le resultat de I'interaction plus forte des ions avec les moltcules de fluide (Clectrostriction). On donne une illustration de la relation qui existe entre p + est le volume libre.Mots clPs : mobilitC cationique themique, solvants des alcanes-n, effets de viscositt [Traduit par la revue]

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