A study on the heat distribution and oxidative modification of aged dammar films upon Er:YAG laser irradiation

Chiara Chillé; Fernando Sala; Qiang Wu; Charis Theodorakopoulos

doi:10.1080/19455224.2019.1707699

A study on the heat distribution and oxidative modification of aged dammar films upon Er:YAG laser irradiation

Chiara Chillé^*, Fernando Sala, Qiang Wu^*, Charis Theodorakopoulos^*

^*Corresponding author for this work

Mathematics, Physics and Electrical Engineering

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

43 Downloads (Pure)

Abstract

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.

Original language	English
Pages (from-to)	59-78
Number of pages	20
Journal	Icon (London, England)
Volume	43
Issue number	1
Early online date	4 Feb 2020
DOIs	https://doi.org/10.1080/19455224.2019.1707699
Publication status	Published - 2020

Keywords

Er:YAG lasers
analysis
dammar varnish
modelling
thermal effects
transmission

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10.1080/19455224.2019.1707699

NRL_42032Accepted author manuscript, 443 KB

Cite this

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title = "A study on the heat distribution and oxidative modification of aged dammar films upon Er:YAG laser irradiation",

abstract = "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.",

keywords = "Er:YAG lasers, analysis, dammar varnish, modelling, thermal effects, transmission",

author = "Chiara Chill{\'e} and Fernando Sala and Qiang Wu and Charis Theodorakopoulos",

note = "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: {\textcopyright} 2020, {\textcopyright} 2020 Icon, The Institute of Conservation. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.",

year = "2020",

doi = "10.1080/19455224.2019.1707699",

language = "English",

volume = "43",

pages = "59--78",

journal = "Icon (London, England)",

issn = "1361-8113",

publisher = "International Committee for the History of Technology",

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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.

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A study on the heat distribution and oxidative modification of aged dammar films upon Er:YAG laser irradiation

Abstract

Keywords

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£37,200 - XpeCAM X02 Evaluation

£44,640 - Partnership with XpectralTEK LDA, Portugal

£649,250 Sponsorship Ed Teppo

Cite this

A study on the heat distribution and oxidative modification of aged dammar films upon Er:YAG laser irradiation

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Activities

£37,200 - XpeCAM X02 Evaluation

£44,640 - Partnership with XpectralTEK LDA, Portugal

£649,250 Sponsorship Ed Teppo

Cite this