Concentration Dependence of Transport Coefficients of Binary and Ternary Mixtures Through Inactive Membranes

Abstract

An experimental investigation on the electrokinetic transport of ternary and binary mixtures through inactive membranes is described. Pyrex glass and quartz were used to perform the porous membranes. The phenomenological equations between the thermodynamic fluxes and forces were always found to be linear. The geometric parameters of the porous membranes were found to be independent on the composition of the mixture. The concentration dependence of the coefficients L 21 and L 22 in the Pyrex-binary mixture systems was non-linear. A similar dependence was found for D/T? (D, dielectric constant; τ?, absolute viscosity) with the composition of the binary mixture. The concentration dependence of the L n and L 22 coefficients was linear for the quartz-ternary mixture systems. Similar trends were found for the reciprocal of the absolute viscosity (η"" 1 ) and the specific electrical conductivity (λ) of the ternary mixtures. Onsager's reciprocity relation was experimentally verified and found to be obeyed within the experimental error. The variations of the coefficients L 12 and L 21 with the composition of the ternary mixtures was non-linear, although less pronounced than that obtained for the binary mixtures. The results confirm the decisive influence of the physical properties of the liquid mixture on the actual values of the electrokinetic transport coefficients.

Anomalous Electroosmotic Flow Through a Heteroporous Ion-Exchange Membrane. A Test Based Upon the Reciprocity Relations

“…The experimental devices and procedures for hydrodynamic permeability, streaming potential and electroosmosis measurements were the same as those described earlier [12][13]. The interruption technique described by Lakshminarayanaiah [1], was followed in the determination of electroosmotic flux.…”

On the Concentration Dependence of Second-Order Phenomenological Coefficients of Electrokinetic Phenomena

“…Instead of driving the liquid through the plug with a Mariotte tube, this was done with nitrogen, following a procedure similar to that used for the measurements of streaming potentials. Details of this experimental setup can be found in [1,3].…”

“…Several of these papers analyse the dependence of the first order phenomenological coefficients L tj with the composition of the liquid mixture employed ( [1] and references therein). However, papers considering the concentration dependence of the second order coefficients L ijk are very scarce.…”

“…Our aim in this paper is the investigation of the influence of the properties (dielectric constant, absolute viscosity, electrical conductivity) of the liquid permeant, and of the C-potential of the solid-liquid interface on the second order phenomenological coefficients. In a previous paper [1], the same study was carried out for the first order coefficients L tj .…”

Dependence of the Electrophoretic Coefficient of Polystyrene Model Colloids on the Solvent Composition

“…However, there are considerable According to De Groot et al (27), the linear phenomenodiscrepancies in the literature on the electrokinetic properties logical equations for sedimentation and electrophoresis are: of those mixtures. Thus, some authors (4-7) have found linear dependences, while other authors (7)(8)(9)(10)(11)(12) obtained…”