Effect of the Temperature on the Electroosmotic Permeability of a Cation-Exchange Membrane

✍ Scribed by V.M. Barragán; C. Ruı́z-Bauzá

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 152 KB
• Volume: 195
• Category: Article
• ISSN: 0021-9797
• DOI: 10.1006/jcis.1997.5145

✦ Synopsis

It can practically be said that the electroosmosis phenome-

The water electroosmotic flux, J V , through a cation exchange non may exist in all kinds of membranes. It can be originated membrane has been measured as a function of the temperature, by the existence of charged groups caused by the adsorption T, with various values of the electrolyte concentration and for of one or more ionic species of the solution on the walls of different current densities. From these measurements the electhe membrane pores or by the existence of a fixed charge troosmotic permeability, W , of the membrane has been deterconcentration in the own membrane structure, as is the case mined under different experimental conditions. In the studied of the membrane used in this work. temperature range, 282 K °T °308 K, a clear dependence of All the measurements of the water electroosmotic trans-W on T was observed, so that, W decreases when T increases at port show that it decreases when the external solution conthe lowest values of T, whereas the opposite behavior occurs at the highest values of T . For this reason the ( T, W ) curves show centration increases and when the water content of the mema minimum in most of the studied cases. The position of this brane decreases as well. Special attention has been paid to minimum as well as the value of the minimum of the electroosthe study of the dependence of the electroosmotic permeabilmotic permeability depends clearly on the concentration and the ity on the current density, I, although in this case a controcurrent density. ᭧ 1997 Academic Press versy exists and no definitive conclusions have been reached.