Premium
Water Transport in Poly( n ‐butyl acrylate) Ion‐Selective Membranes
Author(s) -
AppiahKusi Charles,
Kew Simon J.,
Hall Elizabeth
Publication year - 2009
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200904636
Subject(s) - membrane , diffusion , fourier transform infrared spectroscopy , acrylate , chemistry , ionic bonding , ion , facilitated diffusion , chemical engineering , condensation , phase (matter) , analytical chemistry (journal) , polymer , chromatography , organic chemistry , thermodynamics , biochemistry , engineering , physics , monomer
Water transport across poly( n ‐butyl acrylate) membranes is a critical process in the mechanism of operation for the ion‐selective layers used in the construction of electrodes that detect ionic species. We report the results from a hologram‐membrane composite which was used to characterize the rate of water transport through the ion‐selective membrane. A diffusion coefficient, D app ≈10 −6 cm 2 s −1 was estimated from holographic data and confirmed by FTIR data. An osmotic pressure driven mechanism was rejected and Case II diffusion of water vapor was indicated, suggesting low condensation within the membrane itself. FTIR spectroscopy was also used to characterize the water species at an interface with the membrane revealing composition‐dependent water transport equilibria.