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Abs mbr+touzi 2003


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Abs mbr+touzi 2003

  1. 1. Titre du Document Grafting of anion exchanging groups on SiO2/Si structures for anion detection in waters Auteur(s) TOUZI H. ; SAKLY N. ; KALFAT R. ; ... Résumé Here, we report results of anion exchanger film, based on quaternary ammonium, obtained by grafting EPTMAC (glycidyltrimethyl-ammonium chloride) on silica transducer using AEAPTS (3-(2-aminoethyl-amino)propyltrimethoxysilane) coupling agent. The grafting product was characterized by 1H, 13C, 29Si solid state NMR spectroscopy. Anion exchange on grafted SiO2/Si structures was monitored by impedance measurements: studying the flat band potential shift and the variation of capacitance in accumulation mode versus concentration of anionic species in solution. The grafted membrane exhibits a good affinity for different anions like CO32-, F, I-, dye-SO3- with a detection limit of 10-7 M. Applying sitebinding model, the affinity constant of the anion species towards quaternary ammonium group is found to be 107 M-1. The size of the anion limits the sensitivity of the grafted SiO 2/Si structures. Editeur Elsevier; Elsevier; Elsevier Identifiant ISSN : 0925-4005 Source Sensors and actuators. B, Chemical A. 2003, vol. 96, n° 1-2, pp. 399-406 [8 pages] Langue Anglais