TY - CHAP
T1 - Removal of simulated dust from acrylic paints by laser irradiation at IR, Vis and UV wavelengths
AU - Westergaard, Mette
AU - Pouli, Paraskevi
AU - Theodorakopoulos, Charis
AU - Zafiropulos, Vassilis
AU - Bredal-Jørgensen, Jørn
AU - Staal Dinesen, Ulrik
PY - 2007
Y1 - 2007
N2 - This study aims to investigate whether laser cleaning may be a valuable method for the removal of soiling from water-based acryclic emulsion paints in comparison to traditional cleaning methods. Acrylic-grounded canvas was painted with three different paints (yellow ochre, titanium white and red alizarin) in a poly-butyl-acrylate and methyl methacrylate binder. An acrylic binder was used as a reference. The samples were covered with carbon, SiO2 and soot. Cleaning process ablation rate studies were carried out with a Q-switched Nd:YAG laser at 1064, 532 and 355 nm and a KrF Excimer laser at 248nm. The energy densities varied from 0.03 to 0.69 Jcm-2. The irradiated tests at 248nm were monitored by LIBS analysis. On the samples irradiated at 1064nm, various analytical methods were carried out. A determined alteration of the titanium white paint resulted in a marked decrease in the glass transition temperature (Tg). Furthermore, discoloration (yellowing) occurred on the binder and titanium white paint. The ochre darkened slightly but the alizarin was unchanged. When compared with the samples cleaned with water-based solvents, the samples cleaned with laser appeared cleaner. However, SEM/EDX and ATR showed that SiO2 was still present on the surface after laser cleaning at the tested conditions.
AB - This study aims to investigate whether laser cleaning may be a valuable method for the removal of soiling from water-based acryclic emulsion paints in comparison to traditional cleaning methods. Acrylic-grounded canvas was painted with three different paints (yellow ochre, titanium white and red alizarin) in a poly-butyl-acrylate and methyl methacrylate binder. An acrylic binder was used as a reference. The samples were covered with carbon, SiO2 and soot. Cleaning process ablation rate studies were carried out with a Q-switched Nd:YAG laser at 1064, 532 and 355 nm and a KrF Excimer laser at 248nm. The energy densities varied from 0.03 to 0.69 Jcm-2. The irradiated tests at 248nm were monitored by LIBS analysis. On the samples irradiated at 1064nm, various analytical methods were carried out. A determined alteration of the titanium white paint resulted in a marked decrease in the glass transition temperature (Tg). Furthermore, discoloration (yellowing) occurred on the binder and titanium white paint. The ochre darkened slightly but the alizarin was unchanged. When compared with the samples cleaned with water-based solvents, the samples cleaned with laser appeared cleaner. However, SEM/EDX and ATR showed that SiO2 was still present on the surface after laser cleaning at the tested conditions.
UR - https://librarysearch.northumbria.ac.uk:443/northumbria:default_scope:44UON_ALMA5132960590003181
UR - https://librarysearch.northumbria.ac.uk:443/northumbria:default_scope:44UON_ALMA5132960590003181
M3 - Chapter
SN - 9783540721291
VL - 116
T3 - Springer Proceedings in Physics
SP - 269
EP - 280
BT - Lasers in the Conservation of Artworks
PB - Springer
CY - London
T2 - Lasers in Conservation of Artworks
Y2 - 1 January 2007
ER -