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Ion movements in cellulose acetate membranes
Author(s) -
Horigome Shinkichi,
Taniguchi Yoshio
Publication year - 1977
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1977.070210204
Subject(s) - membrane , ionic radius , ion , divalent , aqueous solution , cellulose acetate , chemistry , radius , ionic bonding , hydrodynamic radius , polymer , intermolecular force , chemical physics , materials science , molecule , organic chemistry , micelle , computer security , biochemistry , computer science
The behavior of ions in a cellulose acetate membrane was discussed from the standpoint of mobilities obtained from the membrane potentials. The mobilities of univalent ions larger in radius or divalent ions relative to Na + ion mobility in the membrane are much different from those in aqueous solutions. The order of the mobilities of ions in the membrane is shown quantitatively. The mobilities of the ions with radii larger than a certain value in the membrane decrease with increase in their size. This could be explained by the physical friction between the ion and the membrane wall. This friction is of importance as the ionic radius comes close to the intermolecular gaps between polymer chains. The mobilities of Na + anyd 1 − ions in the membrane are (2–3) × 10 −7 cm 2 /sec‐V and are about three to four orders of magnitude less than those in aqueous solutions.