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Journal of Chemistry
Volume 2017, Article ID 3475659, 10 pages
https://doi.org/10.1155/2017/3475659
Research Article

Vibrational Spectroscopies and Chemometry for Nondestructive Identification and Differentiation of Painting Binders

1Department of Chemistry “Ugo Schiff”, University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy
2The European Laboratory for Non-Linear Spectroscopy (LENS), Via N. Carrara 1, 50019 Sesto Fiorentino (FI), Italy

Correspondence should be addressed to Marilena Ricci; ti.ifinu@iccir.aneliram

Received 1 February 2017; Accepted 15 March 2017; Published 25 May 2017

Academic Editor: Ewa Schab-Balcerzak

Copyright © 2017 Serena Carlesi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A comprehensive dataset of vibrational spectra of different natural organic binding media is presented and discussed. The binding media were applied on a glass substrate and analyzed after three months of natural ageing. The combination of Raman and FT-NIR spectroscopies allows for an improved identification of these materials as Raman technique is more informative about the skeletal vibrations, while FT-NIR spectroscopy is more sensitive to the substituents and polar groups. The experimental results are initially discussed in the framework of current spectral assignment. Then, multivariate analysis (PCA) is applied leading to differentiation among the samples. The two major principal components allow for a complete separation of the different classes of organic materials. Further differentiation within the same class is possible thanks to the secondary components. The loadings obtained from PCA are discussed on the basis of the spectral assignment leading to clear understanding of the physical basis of this differentiation process.