Characterization of the outmost surface of ion-selective solvent polymeric PVC membranes and protein adsorption

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Abstract

Highly plasticized PVC is the most commonly used membrane matrix of ion-selective sensors. Chemical, physical, and morphological features of plasticized PVC surfaces have been investigated by AFM, TOF-SSIMS and contact angle measurement. The results show chemical, physical and topographical differences depending on the sample preparation procedure as well as the type and amount of plasticizer used. The surfaces of thin films and thick membranes are markedly different, despite the same nominal bulk composition Bovine serum albumin (BSA) adsorption on a typical Ca2+-selective membrane surface is evident from electrical impedance observations while AFM finds no BSA clusters on the membrane surface.

Original languageEnglish
Pages (from-to)729-734
Number of pages6
JournalElectroanalysis
Volume11
Issue number10-11
DOIs
Publication statusPublished - Jul 1999

Keywords

  • Atomic force microscopy
  • Bovine serum albumin
  • Electrical impedance
  • Plasticized PVC membranes
  • Thin and thick membranes

ASJC Scopus subject areas

  • Analytical Chemistry
  • Electrochemistry

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