Electrochemical behavior and analytical utility of a controlled porosity cellulose acetate film bearing 2,6-dichlorophenolindophenol
Φόρτωση...
Ημερομηνία
Συγγραφείς
Florou, A. B.
Prodromidis, M. I.
Karayannis, M. I.
Tzouwara-Karayanni, S. M.
Τίτλος Εφημερίδας
Περιοδικό ISSN
Τίτλος τόμου
Εκδότης
WILEY-VCH Verlag
Περίληψη
Τύπος
Είδος δημοσίευσης σε συνέδριο
Είδος περιοδικού
peer reviewed
Είδος εκπαιδευτικού υλικού
Όνομα συνεδρίου
Όνομα περιοδικού
Electroanalysis
Όνομα βιβλίου
Σειρά βιβλίου
Έκδοση βιβλίου
Συμπληρωματικός/δευτερεύων τίτλος
Περιγραφή
Glassy carbon electrodes coated with a cellulose acetate film incorporating 2,6-dichlorophenoiindophenol (CA/DCPI) were developed. At this multifunctional coating DCPI serves as a mediator for the electron transfer kinetics and in conjunction with the cellulose acetate's size exclusion properties it results in a chemical sensor with great selectivity and stability. Access to the surface can be manipulated via controlled hydrolysis of the film in KOH or ZnCl2 solutions. Different permeabilities are obtainable by hydrolyzing the him over different time periods. Diffusion coefficients D-app of these films for analytes of different molecular sizes were determined with double step chronocoulometry. The electrochemical characteristics of the immobilized DCPI were explored using cyclic voltammetry. The formal potentials of the immobilized DCPI coating hydrolyzed in KOH, ZnCl2 and with ZnCl2 in the casting solution were found to be 70, 75, and 79 mV (vs. Ag/AgCl/ 3M KCl), respectively, at pH 6.5. The dissociation constants of the DCPI redox couple were found to be 5.2 +/- 0.1 (pKr) and 7.4 +/- 0.05 (pKo). The electrochemical rate constant k(o) of the of DCPI redox couple within the film was also evaluated. The behavior of the sensor towards different reducing compounds was investigated. The sensors showed good operational and storage stability.
Περιγραφή
Λέξεις-κλειδιά
controlled porosity cellulose acetate film, 2,6-dichlorophenolindophenol, permselectivity studies, electrochemical study, chemically modified electrodes, electrocatalytic oxidation, polymer-films, nicotinamide coenzymes, carbon-paste, sensors, linearity, membranes, systems, enzymes
Θεματική κατηγορία
Παραπομπή
Σύνδεσμος
<Go to ISI>://000086392100007
http://onlinelibrary.wiley.com/store/10.1002/(SICI)1521-4109(20000301)12:5<361::AID-ELAN361>3.0.CO;2-E/asset/361_ftp.pdf?v=1&t=h0dzruq6&s=f95b89270e347d209cde50c1f79cb6f7897b4c54
http://onlinelibrary.wiley.com/store/10.1002/(SICI)1521-4109(20000301)12:5<361::AID-ELAN361>3.0.CO;2-E/asset/361_ftp.pdf?v=1&t=h0dzruq6&s=f95b89270e347d209cde50c1f79cb6f7897b4c54
Γλώσσα
en
Εκδίδον τμήμα/τομέας
Όνομα επιβλέποντος
Εξεταστική επιτροπή
Γενική Περιγραφή / Σχόλια
Ίδρυμα και Σχολή/Τμήμα του υποβάλλοντος
Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας