Non-equilibrium thermodynamic studies of electro—kinetic effects—XI. Studies with aqueous dioxane

• Published in: Electrochimica acta 1978, Vol.23 (6), p.533-537
• Main Authors: Blokhra, R.L., Parmar, M.L., Sharma, V.P.
• Format: Article
• Language: English
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/0013-4686(78)85032-4

Experimental results for the measurements of electro—osmosis, electro—osmotic pressure difference, streaming potential for dioxane—water (DH 2O) mixtures (30%, 40%, 50% and 60% by mass of dioxane) using Pyrex sintered disc ( G 3) at 25° and at voltages of 40 V to 300 V are reported. The data are analysed in the light of the theory of non-equilibrium thermodynamics. It has been found that the validity of the phenomenological relations describing electro—kinetic effects increases with the decrease in the dielectric constant of the mixture. Second-order coefficients estimated from the electro—osmosis and electro—osmotic pressure difference are reported. Onsager's reciprocity relations have been found to hold good for all the mixtures. It has been found that the concentration dependence of L 22 and L 21 do not conform to the Spiegler's frictional model. Efficiency of electro—kinetic energy conversion (η e) for electro—osmotic flows has been calculated and it is found that for different composition of dioxane—water mixtures η max was obtained at half the value of the electro—osmotic pressure difference.