In this work, we studied an ion-exchange membrane based on an inert polymer skeleton in which it is dispersed and anchored a molecule with charged groups able to discriminate and bind positive or negatively charged ions present in a sample. In order to be ready to work, electromembranes need a complex procedure called activation or conditioning. Although most of the known literature looks at the subject from an electrochemical point of view, we put forward a structural approach. Membrane conditioning, in fact, is considered a required step to improve sensor performances and to allow the collection of reproducible data. Even if this operation is carefully followed by all the operators working with sensors equipped with a membrane, it looks like that a thoroughly explanation of the working mechanism and a detailed balance of cost and gains has still not been carried out. As a consequence, we suggest a bulk or membrane approach, where the landscape is mainly characterized by the long-range structure of the membrane itself. Our findings suggest that membrane conditioning has to be carried out carefully and the advantages of this pre-treatment can be appreciated especially for very low concentration measurements. The need for the conditioning mainly results from the necessity of a complete permeation of all the different tortuous channels constituting the membrane itself. RI Punzo, Francesco/A-4921-2011; Li Destri, Giovanni/C-8807-2012; Toro, Roberta/F-8157-2013 OI Punzo, Francesco/0000-0003-4212-8064; Li Destri, Giovanni/0000-0001-6195-659X; Toro, Roberta/0000-0002-5423-2881

Polymeric membranes conditioning for sensors applications: mechanism and influence on analytes detection

PUNZO, FRANCESCO;LI DESTRI NICOSIA, GIOVANNI
2012-01-01

Abstract

In this work, we studied an ion-exchange membrane based on an inert polymer skeleton in which it is dispersed and anchored a molecule with charged groups able to discriminate and bind positive or negatively charged ions present in a sample. In order to be ready to work, electromembranes need a complex procedure called activation or conditioning. Although most of the known literature looks at the subject from an electrochemical point of view, we put forward a structural approach. Membrane conditioning, in fact, is considered a required step to improve sensor performances and to allow the collection of reproducible data. Even if this operation is carefully followed by all the operators working with sensors equipped with a membrane, it looks like that a thoroughly explanation of the working mechanism and a detailed balance of cost and gains has still not been carried out. As a consequence, we suggest a bulk or membrane approach, where the landscape is mainly characterized by the long-range structure of the membrane itself. Our findings suggest that membrane conditioning has to be carried out carefully and the advantages of this pre-treatment can be appreciated especially for very low concentration measurements. The need for the conditioning mainly results from the necessity of a complete permeation of all the different tortuous channels constituting the membrane itself. RI Punzo, Francesco/A-4921-2011; Li Destri, Giovanni/C-8807-2012; Toro, Roberta/F-8157-2013 OI Punzo, Francesco/0000-0003-4212-8064; Li Destri, Giovanni/0000-0001-6195-659X; Toro, Roberta/0000-0002-5423-2881
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11769/41579
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