Tipo di tesi
Tesi di dottorato di ricerca
Titolo
Ageing and fading of organic pigments in art: a multi-analytical study based on mass spectrometric techniques
Settore scientifico disciplinare
CHIM/01 - CHIMICA ANALITICA
Corso di studi
SCIENZE CHIMICHE E DEI MATERIALI
Parole chiave
- ageing
- liquid chromatography
- mass spectrometry
- Synthetic organic dyes and pigments
Data inizio appello
07/03/2019
Riassunto (Italiano)
Organic dyes and pigments are among the most unstable and labile molecules in work of arts. The sensitivity of these compounds to light exposure can lead to drastic changes in the appearance of Ancient and Contemporary artworks.
This thesis aims at investigating the fading and degradation processes, mainly due to photo-oxidation effects, of several synthetic organic pigments, poorly investigated until now. The ageing phenomena were mainly investigated by means of Liquid Chromatography coupled with Diode Array and Fluorescence Detector or high-resolution mass spectrometry (LC-DAD-FD, LC-HRMS). Nevertheless, several other techniques such as colorimetry, Infrared spectroscopy and electrochemical methods were applied for better describing the degradation phenomena.
The thesis outline is as follows: state of the art, materials and methods, Nitro dyes and pigments, Monoazo pigments, β-naphthol and naphthol AS dyes and pigments, Xanthene dyes and pigments, Triarylmethine dyes and pigments, Case study of “Composizione-Superficie lunare” by Giulio Turcato, ageing of wool-degradation of the textile matrix.
