Chemical surface, diffusional, electrical and elastic characterizations of two different dense regenerated cellulose membranes

A comparison of NaCl transport across two dense cellulosic membranes from different suppliers is presented. Hydraulic and diffusional permeabilities were determined from volume flow–applied pressure and concentration–time relationships, while cation transport number and membrane conductivity were determined from electromotrice force and impedance spectroscopy measurements, respectively. Chemical surface differences between both membranes are correlated to transport parameters and morphology, but differences in elastic properties of both membranes might also be considered in order to get a more complete picture of membrane behaviors and to obtain structural–transport parameters correlations.

Permeability–concentration dependence (left) and strain–stress curves (right) at two time instants (t=0t=0 and t=10 mint=10 min).Figure optionsDownload as PowerPoint slide