Universidad Complutense de Madrid
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On the fixed charge concentration and the water electroosmotic transport in a cellulose-acetate membrane

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Barragán García, Vicenta María and Rueda Sánchez, Cristóbal and Ruiz Bauzá, Carlos (1995) On the fixed charge concentration and the water electroosmotic transport in a cellulose-acetate membrane. Journal of Colloid and Interface Science, 172 (2). pp. 361-367. ISSN 0021-9797

Official URL: http://pdn.sciencedirect.com/science?_ob=MiamiImageURL&_cid=272564&_user=144492&_pii=S0021979785712659&_check=y&_origin=article&_zone=toolbar&_coverDate=15-Jun-1995&view=c&originContentFamily=serial&wchp=dGLzVlB-zSkWb&md5=03f99b1c7a70f9bea1d1020296b0b544&


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Abstract

The ionic permeselectivity of a cellulose acetate membrane prepared in our laboratory has been studied from membrane potential and electroosmotic flux measurements. The obtained results show that, at low values of the external salt concentration, the membrane behaves in a cationic-exchange way. The membrane fixed charge concentration has been estimated from the membrane potential measurements as similar to 10(-2) mol/liter. Electroosmotic transport decreases notably when the concentration increases, even reversing its sign at concentrations higher than similar to 10(-1) mol/liter. The weak cationic selective character of the membrane and the fact that the anion mobility is higher than the cation mobility in the membrane phase are both considered responsible for the observed significant sign reversal of the electroosmotic permeability.


Item Type:Article
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© 1995 Academic Press

Uncontrolled Keywords:Membrane Potential, Electroosmosis, Ion-Exchange Membranes, Fixed Charge Concentration.
Subjects:Sciences > Physics > Thermodynamics
ID Code:21169
Deposited On:13 May 2013 12:04
Last Modified:02 Mar 2016 16:27

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