FTIR-ATR study of water uptake and diffusion through ion-selective membranes based on poly(acrylates) and silicone rubber

Fredrik Sundfors, Tom Lindfors, Lajos Höfler, Róbert Bereczki, R. Gyurcsányi

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

For the first time, FTIR-ATR spectroscopy was used to study the water uptake and its diffusion in ion-selective membranes (ISMs) based on poly(acrylates) (PAs) and silicone rubber (SR), which are emerging materials for the fabrication of ISMs for ultratrace analysis. Three different types of PA membranes were studied, consisting of copolymers of methyl methacrylate with n-butyl acrylate, decyl methacrylate, or isodecyl acrylate. Numerical simulations with the finite difference method showed that in most cases the water uptake of the PA and SR membranes could be described with a model consisting of two diffusion coefficients. The diffusion coefficients of the PA membranes were approximately 1 order of magnitude lower than those of plasticized poly(vinyl chloride) (PVC)-based ISMs and only slightly influenced by the membrane matrix composition. However, the simulations indicated that during longer contact times, the water uptake of PA membranes was considerably higher than that for plasticized PVC membranes. Although the diffusion coefficients of the SR and plasticized PVC membranes were similar, the SR membranes had the lowest water uptake of all membranes. This can be beneficial in preventing the formation of detrimental water layers in all-solid-state ionselective electrodes. With FTIR-ATR, one can monitor the accumulation of different forms of water, i.e., monomeric, dimeric, clustered, and bulk water.

Original languageEnglish
Pages (from-to)5925-5934
Number of pages10
JournalAnalytical Chemistry
Volume81
Issue number14
DOIs
Publication statusPublished - Jul 15 2009

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Ion selective membranes
Acrylates
Silicone Elastomers
Membranes
Water
Polyvinyl Chloride
Methacrylates
Vinyl Chloride
Finite difference method
Copolymers
Spectroscopy

ASJC Scopus subject areas

  • Analytical Chemistry

Cite this

FTIR-ATR study of water uptake and diffusion through ion-selective membranes based on poly(acrylates) and silicone rubber. / Sundfors, Fredrik; Lindfors, Tom; Höfler, Lajos; Bereczki, Róbert; Gyurcsányi, R.

In: Analytical Chemistry, Vol. 81, No. 14, 15.07.2009, p. 5925-5934.

Research output: Contribution to journalArticle

Sundfors, Fredrik ; Lindfors, Tom ; Höfler, Lajos ; Bereczki, Róbert ; Gyurcsányi, R. / FTIR-ATR study of water uptake and diffusion through ion-selective membranes based on poly(acrylates) and silicone rubber. In: Analytical Chemistry. 2009 ; Vol. 81, No. 14. pp. 5925-5934.
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