PVA hydrogel as polymer electrolyte for electrochemical impedance analysis on archaeological metals - 25/04/19

Doi : 10.1016/j.culher.2018.09.017

Francesca Di Turo ^a,^⁎ , Pietro Matricardi ^b, Chiara Di Meo ^b, Franco Mazzei ^b, Gabriele Favero ^b, Daniela Zane ^c,^⁎
^a Department of Earth Sciences, Sapienza University of Rome, P. le Aldo Moro 5, Rome, Italy
^b Department of Chemistry and Drug Technologies, Sapienza University of Rome, P. le Aldo Moro 5, Rome, Italy
^c Istituto per lo Studio dei Materiali Nanostrutturati (ISMN), CNR, Via del Castro Laurenziano 7, 00161 Rome, Italy

^⁎Corresponding authors.

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Highlights

•	It is proposed the poly(vinyl alcohol) for punctual and in-situ EIS analysis.
•	An electrochemical cell is built in order to place the self-consistent disk of PVA.
•	The conductivity of PVA is tested.
•	EIS spectra are obtained employing PVA instead of traditional solution.
•	PVA polymer electrolyte membranes perform likely electrolytic solutions.

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Abstract

The development of an electrochemical cell based on poly(vinyl alcohol) (PVA) hydrogel as polymer electrolyte for electrochemical impedance spectroscopy analysis (EIS) is discussed. PVA hydrogel is prepared with different cycles of freeze/thawing (F/T) employing distillated and mineral water as solutions. The PVA-disks obtained are compared for their conductivities in order to employ it in an appropriate cell for diagnostic purposes, reducing the invasiveness of the analysis on the sample. The test of the self-consistent disk of PVA is carried out on a modern sample of copper and on an archaeological bronze coin, obtaining an alternative of the classical electrochemical cell for EIS measurements on ancient metals.

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Keywords : Hydrogels, Ancient metals, Cultural heritage, EIS, PVA

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Introduction

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Materials and methods

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Preparation and characterization of PVA membranes

Application of PVA cell on real samples

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Vol 37

P. 113-120 - mai 2019 Retour au numéro

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PVA hydrogel as polymer electrolyte for electrochemical impedance analysis on archaeological metals - 25/04/19

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