Comparison of Surface and Net Charge Densities of Poly(acrylonitrile) Membranes Grafted with Ionic Monomers: Hydrophilic and Hydrophobic Effects of Graft Chain

Passive Transport of Ionic Drugs through Membranes with pH-Dependent Fixed Charges

“…These fluxes can now be compared directly with the experimental data (Figs. 3-5) and reproduce some of the observed trends when the membrane fixed charge concentration and pK a values obtained in previous independent experimental studies (9)(10)(11) are introduced into the model.…”

“…Single-charged PAN membranes were prepared by graft polymerization with the initiation of a redox system, i.e., FeSO 4 -H 2 O 2 for AAc (AAc-grafted PAN) and NaHSO 3 -(NH 4 ) 2 S 2 O 8 for DMAPAA (DMAPAA-grafted PAN) (9)(10)(11). For amphoteric-charged PAN membranes, graft polymerization was performed by a radical reaction in an aqueous solution containing both AAc and DMAPAA monomers, where the feed monomer ratio of AAc to DMAPAA was 60/40.…”

Effect of Proton Concentration on Membrane Potential across a Weak Amphoteric Polymer Membrane

“…As a result of curve fitting, the ratio of positive charge concentration and negative charge concentration was also determined to be 0.34/0.66 (=0.52). This ratio did not deviate much from the value of 0.40/0.60 (=0.67) by Jimbo et al which was determined by ζ -potential measurement (8)(9)(10)(11).…”

“…The following values were used for the calculation. K P and K N are 6.4 and 4.2, respectively, which were given by Jimbo et al (8)(9)(10)(11) …”

“…In the Original Theoretical Model, the concentrations (c 1∼4 (O), c 1∼4 (d)) of four ions (i = 1 for salt cations (Na + ), i = 2 for salt anions (Cl − ), i = 3 for hydrogen ions (H + ), and i = 4 for hydroxide ions (OH − )) in the membrane were calculated from Eqs. [8], [9], [10a], and [10b], the activities of four ions in membrane were calculated. In the Original Theoretical Model, the mobility ω i of each ion in calculating a diffusion potential is deduced from literature data in aqueous solution.…”