TY - JOUR
T1 - A study on the heat distribution and oxidative modification of aged dammar films upon Er:YAG laser irradiation
AU - Chillé, Chiara
AU - Sala, Fernando
AU - Wu, Qiang
AU - Theodorakopoulos, Charis
N1 - Funding Information:
The authors acknowledge Ed Teppo (founder and president of former Enterprise Big Sky Laser Technologies) for lending the Fotona Fidelis XS Er:YAG laser to the Northumbria University Art Conservation Laboratory. Special thanks also go to the PerkinElmer London Lab for their time and input during the acquisition of diffuse reflectance parameter with the Mid-IR Integrating sphere. Thanks also go to Mr W. D. Carswell, Department of Chemistry, Durham University, for the Differential Scanning Calorimetry (DSC) data. This research is sponsored by RDF Northumbria Research Support.
Publisher Copyright:
© 2020, © 2020 Icon, The Institute of Conservation.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020
Y1 - 2020
N2 - This work shows the impact of one Er:YAG laser pulse to both the surface and bulk of aged dammar varnishes. Tests were performed in fluences ranging from 0.56 to 2.4J/cm2 and pulse durations of 100 and 300μs. Temperature changes upon irradiation were examined by (a) live recordings with an infrared thermal camera, and (b) determining the optical properties of the varnish, which allowed for estimates of the linear absorption coefficient and the temperature rise associated with the laser irradiation. Transmission and Fourier Transform Infrared (FTIR) spectroscopy studies captured increased energy transmissions through varnish films, as well as registering a reduction of hydroxides and carbon–hydrogen bonding as a function of fluence, respectively. FTIR and Differential Scanning Calorimetry (DSC) experimentally determined the absorption coefficient and the specific heat capacity of dammar films, and an overview of laser spots was carried out with Scanning Electron Microscopy (SEM). Evidence on the varnish response to Er:YAG laser irradiation is provided.
AB - This work shows the impact of one Er:YAG laser pulse to both the surface and bulk of aged dammar varnishes. Tests were performed in fluences ranging from 0.56 to 2.4J/cm2 and pulse durations of 100 and 300μs. Temperature changes upon irradiation were examined by (a) live recordings with an infrared thermal camera, and (b) determining the optical properties of the varnish, which allowed for estimates of the linear absorption coefficient and the temperature rise associated with the laser irradiation. Transmission and Fourier Transform Infrared (FTIR) spectroscopy studies captured increased energy transmissions through varnish films, as well as registering a reduction of hydroxides and carbon–hydrogen bonding as a function of fluence, respectively. FTIR and Differential Scanning Calorimetry (DSC) experimentally determined the absorption coefficient and the specific heat capacity of dammar films, and an overview of laser spots was carried out with Scanning Electron Microscopy (SEM). Evidence on the varnish response to Er:YAG laser irradiation is provided.
KW - Er:YAG lasers
KW - analysis
KW - dammar varnish
KW - modelling
KW - thermal effects
KW - transmission
UR - http://www.scopus.com/inward/record.url?scp=85079150553&partnerID=8YFLogxK
U2 - 10.1080/19455224.2019.1707699
DO - 10.1080/19455224.2019.1707699
M3 - Article
SN - 1361-8113
VL - 43
SP - 59
EP - 78
JO - Icon (London, England)
JF - Icon (London, England)
IS - 1
ER -