Automated characterization of varnishes photo-degradation using portable T-controlled Raman spectroscopy

Osticioli, I. and Ciofini, D. and Mencaglia, A.A. and Siano, S. (2017) Automated characterization of varnishes photo-degradation using portable T-controlled Raman spectroscopy. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 172. pp. 182-188. ISSN 1386-1425

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In this work, a portable-Raman device (excitationwavelength 1064 nm)was employed for the first time for continuously monitoring the complex molecular dynamics of terpenoid resins (dammar, mastic, colophony, sandarac and shellac), which occur during their ageing under artificial light exposure. The instrumentation was equipped with a pyroelectric sensor allowing for temperature control of the sample's irradiated surface while the acquisition of spectra occurs by setting fixed maximum temperature and total radiant exposure. Resins were dropped into special pits over a dedicated rotating wheelmoved by a USB motor. The rotation allowed samples sliding between the positions designated for the acquisition of the Raman spectra and that for artificial ageing. Samples were exposed to artificial light for 45-days and almost 400 spectra for each resin sample were collected. The exposure to artificial light led to significant changes allowing the characterization of the alteration process. The automated acquisition of a large number of spectra overtime during light-exposure has given the possibility to distinguish fast dynamics,mainly associated to solvent evaporation, fromthose slower due to resins photo-degradation processes.

Item Type: Article
Uncontrolled Keywords: Molecular spectroscopy; Ageing; Resins; Terpenoid; Dynamics; Portable
Subjects: 500 Scienze naturali e Matematica > 540 Chimica e scienze connesse
Depositing User: Dr. iacopo osticioli
Date Deposited: 10 Jun 2019 15:05
Last Modified: 10 Jun 2019 15:05

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