TY - GEN A1 - Schmidt, Birgit Angelika T1 - Decontamination of biocidal loaded wooden artworks by means of laser and plasma processing N2 - Many wooden artworks are contaminated by DDT (dichlorodiphenyltrichloroethane) as a result of a surface treatment by means of Hylotox-59©. The liquid preservative was used until the end of the 80s. DDT crystal structures are formed on the wood surfaces by the "blooming" of chlorine compounds. Contaminated waste wood with natural biocide ageing, gilded and wood carved elements of an old picture frame and wooden samples with paint layers were provided by the Schlossmuseum Sondershausen. The removal of DDT was evaluated employing femtosecond and nanosecond laser radiation and cold atmospheric plasma technique using different working gases (air, nitrogen, and argon). Before laser application, a chlorine measurement is done by X-ray fluorescence (XRF) analysis as reference. After laser processing, the XRF analysis is used again at the same surface position to determine depletion rates. Additionally, a documentation and characterization of the sample surface is done before and after laser and plasma treatment using optical microscopy. For plasma processing with various systems a chlorine measurement is done by gas chromatographic-mass spectrometry (GCMS) analysis. For laser treatment a depletion of the chlorine concentration of 55-70% and 75% was achieved for 1064-nm nanosecond pulses and 800-nm femtosecond pulses, respectively. For the application of 30-fs laser pulses, no crystalline DDT residues remain on the sample surfaces. This holds also for the plasma processing with nitrogen as working gas. T2 - Conference on Lasers in the Conservation of Artworks (LACONA XI) CY - Krakow, Poland DA - 19.09.2016 KW - Decontamination KW - Wood KW - DDT KW - Laser cleaning KW - Plasma treatment PY - 2016 UR - https://opus4.kobv.de/opus4-bam/frontdoor/index/index/docId/38903 AN - OPUS4-38903 AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany