TY - CONF A1 - Kautek, Wolfgang A1 - Puchinger, L. A1 - Leichtfried, D. A1 - Pentzien, Simone ED - Meunier, M. T1 - Laser interaction with parchment in the near-ultraviolet and near-infrared wavelength range N2 - A detailed diagnostic study of the interaction of nanosecond laser pulses from the near-ultraviolet into the near-infrared wavelength range with various types of contemporary and ancient parchments is presented. The advantages of laser cleaning due to the absence of chemical agents, spectroscopic selectivity, micro-precision, computer-aided handling can only be verified when physico-chemical diagnostics guarantee destructionless processing. Scanning Electron Microscopy (SEM) data are correlated with morphological changes in dependence on the laser fluence and wavelength. The question, to what extent the chemical degradation of collagen is affected by various laser treatment parameters, could be resolved by Transmission Electron Microscopy (TEM) of collagen fibres collected from the outermost laser-exposed surface layer. It is also shown how Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFT), and Pyrolysis Capillary Gaschromatography (PY-CGC) can be employed in the chemical diagnostics of laser cleaning of parchment. This study suggests that the ageing status of parchment artefacts plays a major role in assessing the laser cleaning limits. T2 - Symposium D - European Materials Research Society CY - Strasbourg, France DA - 2002-06-18 PY - 2002 UR - http://www.emrs-strasbourg.com/files/pdf/2002_SPRING/02_Prog_Dv2.pdf N1 - Serientitel: Applied surface science – Series title: Applied surface science VL - 208/209.2003,1 IS - 1 SP - 1(?) PB - Elsevier CY - Amsterdam AN - OPUS4-1590 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Pentzien, Simone A1 - Rabin, Ira A1 - Hahn, Oliver A1 - Krüger, Jörg A1 - Kleber, F. A1 - Hollaus, F. A1 - Diem, M. A1 - Sablatnig, R. T1 - Can modern technologies defeat nazi censorship? KW - Laser cleaning KW - Multispectral imaging KW - Image enhancement KW - Ancient manuscripts KW - Image restoration PY - 2010 SN - 1556-4673 VL - 2 IS - 3, Article 1 SP - 1 EP - 16 PB - Association for Computing Machinery CY - New York, NY, USA AN - OPUS4-25651 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Rabin, Ira A1 - Schütz, R. A1 - Kohl, Anka A1 - Wolff, Timo A1 - Tagle, R. A1 - Pentzien, Simone A1 - Hahn, Oliver A1 - Emmel, S. T1 - Identification and classification of historical writing inks in spectroscopy: a methodological overview N2 - The identification of the type of ink should be among the primary goals of manuscript description. Several techniques of instrumental analysis are available, and new tools have been appearing on the market, the main development having been to more portability and user friendliness. In this article, we would like to give an overview of several existing methods and of their respective advantages and the results (on the example of a Coptic manuscript) that can be obtained with their help. KW - Archaeometry KW - Non-destructive testing KW - Spectroscopy KW - Manuscript studies PY - 2012 SN - 2078-3841 VL - 3 SP - 26 EP - 30 PB - ESF CY - Strasbourg AN - OPUS4-26940 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CHAP A1 - Bonse, Jörn A1 - Höhm, S. A1 - Hartelt, Manfred A1 - Spaltmann, Dirk A1 - Pentzien, Simone A1 - Koter, Robert A1 - Marschner, S. A1 - Rosenfeld, A. A1 - Krüger, Jörg ED - König, K. ED - Ostendorf, A. T1 - Femtosecond laser-induced surface nanostructures for tribological applications N2 - Laser-induced periodic surface structures (LIPSS) were generated on two types of steel (100Cr6, X30CrMoN15-1) and two types of titanium (Ti, Ti6A14V) surfaces upon irradiation with multiple linear polarized femtosecond laser pulses in air environment (pulse duration 30 fs, central wavelength 790 nm, pulse repetition rate 1 kHz, Gaussian beam shape). Teh conditions (laser fluence, spatial spot overlap) were optimized in a sample-scanning geometry for the processing of large surface areas covered homogeneously by two different types of LIPSS - either near wavelength or sub-100 nm structures. The tribological performance of the nanostructured surfaces was characterized under reciprocating sliding at 1 Hz against a ball of hardened steel using different lubricants and normal forces. After 1000 cycles the corresponding wear tracks were characterized by optical and scanning electron microscopy. For specific conditions, the wear was strongly reduced and laser-generated nanostructures endured the tribological treatment. Simultaneously, a significant reduction of the friction coefficient was observed in the laser-irradiated LIPSS-covered areas, indicating the benefit of laser surface structuring for tribological applications. The spatially Gaussian shaped beam used for the laser processing was transformed via beam shaping into a top hat distribution at the surface of the samples for optimization. The tribological performance of the laser-induced nanostructures is discussed on the basis of different physical and chemical mechanisms. PY - 2015 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-332647 SN - 978-3-11-033718-1 SN - 978-3-11-035432-4 DO - https://doi.org/10.1515/9783110354324-011 SP - Chapter 7, 141 EP - 156 PB - De Gruyter AN - OPUS4-33264 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -