Dokument-ID Dokumenttyp Autoren/innen Persönliche Herausgeber/innen Haupttitel Abstract Auflage Verlagsort Verlag Herausgeber (Institution) Erscheinungsjahr Titel des übergeordneten Werkes Jahrgang/Band ISBN Veranstaltung Veranstaltungsort Beginndatum der Veranstaltung Enddatum der Veranstaltung Ausgabe/Heft Erste Seite Letzte Seite URN DOI Lizenz Datum der Freischaltung OPUS4-886 Zeitschriftenartikel Kautek, Wolfgang; Conradi, Andrea; Sahre, Mario; Fabjan, Ch.; Drobits, J.; Bauer, G.; Schuster, P. In Situ Investigations of Bromine-Storing Complex Formation in a Zinc-Flow Battery at Gold Electrodes Pennington, NJ Electrochemical Society 1999 Journal of the electrochemical society 146 9 3211 3216 2016-02-19 OPUS4-994 Zeitschriftenartikel Kautek, Wolfgang; Conradi, Andrea; Fabjan, Ch.; Bauer, G. In situ FTIR spectroscopy of the Zn-Br battery bromine storage complex at glassy carbon electrodes Kidlington Elsevier Science 2000 Electrochimica acta 45 5 815 823 2016-02-19 OPUS4-630 Zeitschriftenartikel Kautek, Wolfgang; Pentzien, Simone; Conradi, Andrea; Krüger, Jörg; Brzezinka, Klaus-Werner Pulsed-laser deposition and boron-blending of diamond-like carbon (DLC) thin films Amsterdam North-Holland 1996 Applied surface science 106 158 165 2016-02-19 OPUS4-1583 Beitrag zu einem Tagungsband Kautek, Wolfgang; Handrea-Haller, Marlene; Sahre, Mario; Conradi, Andrea; Neubauer, A.; Sleytr, U.B. Electrochemistry of nano-scale bacterial surface protein layers on gold Frankfurt a.M. DECHEMA International Society of Electrochemistry 2002 Electrochemistry in molecular and microscopic dimensions 53th Annual meeting of the International Society of Electrochemistry Düsseldorf, Germany 2002-09-15 2002-09-20 1(?) 2016-02-19 OPUS4-5989 Zeitschriftenartikel Kautek, Wolfgang; Pentzien, Simone; Conradi, Andrea; Leichtfried, D.; Puchinger, L. Diagnostics of parchment laser cleaning in the near-ultraviolet and near-infrared wavelength range: a systematic scanning electron microscopy study A detailed diagnostic study of the interaction of nanosecond laser pulses from the near-ultraviolet to 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 and computer-aided handling can only be verified when physico-chemical diagnostics guarantee destructionless processing. Scanning electron microscopy data are correlated with chemical degradation and morphological changes dependent on the laser fluence and wavelength. It is also shown how transmission electron microscopy, diffuse reflectance infrared Fourier transform spectroscopy, and pyrolysis capillary gas chromatography 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. Paris Elsevier 2003 Journal of cultural heritage 4 sup.1 179s 184s 10.1016/S1296-2074(02)01195-0 2016-02-19 OPUS4-17974 Beitrag zu einem Sammelband Pentzien, Simone; Conradi, Andrea; Krüger, Jörg; Wurster, R. M. Castillejo, ; P. Moreno, ; M. Oujja, ; R. Radvan, ; J. Ruiz, Monitoring of the laser cleaning process of artificially soiled paper Laser cleaning of soiled paper is a challenging task due to the fact that a contamination has to be removed and a fragile organic material has to be preserved. The ejection of particles forms a significant channel for the removal of unwanted surface contaminations and can be exploited for an in-situ monitoring of the cleaning procedure. 532-nm-nanosecond single and multi pulse laser cleaning of artificially soiled Whatman© paper was performed. Particles were registered with a dust monitor. These in-situ experiments were combined with ex-situ investigations of cleaning and substrate damage thresholds by means of light and scanning electron microscopic techniques. The cleaning efficiency measured by a multi-spectral imaging system was compared to the in-situ particle monitoring. Additionally, possible color changes of the paper substrate were evaluated. Taylor & Francis 2008 LACONA VII International Conference, "Lasers in the Conservation of Artworks", September 17-21, 2007, Madrid, Spain (Proceedings) 978-0-415-47596-9 LACONA VII International Conference, "Lasers in the Conservation of Artworks" Madrid, Spain 2007-09-17 2007-09-21 345 351 2016-02-19 OPUS4-14467 Zeitschriftenartikel Wurster, R.; Pentzien, Simone; Conradi, Andrea; Krüger, Jörg Characterization of laser-generated microparticles by means of a dust monitor and SEM imaging Nanosecond laser (1064 nm wavelength) cleaning of artificially soiled paper as a model sample simulating a real-world artwork was performed. During the cleaning process, the ejection of particles was monitored in situ by means of a dust monitor (8 size classes, ranging from 0.3 µm to >2 µm) and ex situ using a mini-cascade impactor (MKI, 5 stages). The cleaning result was analyzed by scanning electron microscopy (SEM) considering possible laser-induced damages to the substrate. Size distributions of emitted particles were measured depending on the processing parameters: laser fluence, F, and pulse number per spot, N. High numbers of large (>2 µm) particles were collected by the mini-cascade impactor indicating a gas dynamical liftoff process. Obviously, these particles were not affected by the laser-matter interaction. The different methods (SEM, MKI, and dust monitor) are compared with respect to their usefulness for a proper interpretation of the cleaning results. London Harwood Academic Publ. 2006 Laser chemistry 2006 Article ID 31862 1 5(?) 10.1155/2006/31862 2016-02-19 OPUS4-17331 Zeitschriftenartikel Krüger, Jörg; Pentzien, Simone; Conradi, Andrea Cleaning of artificially soiled paper with 532-nm nanosecond laser radiation Cleaning of paper is a challenging task due to the fact that a contamination should be removed and a fragile organic original material has to be preserved. Pulsed laser cleaning of artificially soiled Whatman© filter paper samples serving as models for historical paper was performed. Different cleaning strategies employing 8-ns laser pulses at 532 nm wavelength were applied to clean paper avoiding undesired effects like discoloration (yellowing) and mechanical deterioration of the substrate. Multi shot experiments with low-energy pulses were compared with single pulse investigations utilizing high pulse energies achieving a constant energy load incident on the samples in both cases. The cleaning efficiency and possible yellowing effects were evaluated by means of a multi spectral imaging system. An extensive microscopic analysis of the cleaned parts of the samples provided insight into the remaining soiling on the surface and in the bulk of the paper material after laser treatment. As a reference, a hard and a soft eraser were used to clean the samples. Berlin Springer 2008 Applied physics A 92 1 179 183 10.1007/s00339-008-4476-4 2016-02-19 OPUS4-20398 Beitrag zu einem Sammelband Pentzien, Simone; Conradi, Andrea; Lussky, K.; Engel, P.; Krüger, Jörg Engel, Patricia Laser cleaning of artificially soiled paper Laser cleaning for works of art on paper might be a supplemental, noncontact method to overcome some of the limitations of traditional dry cleaning techniques. Three different types of paper (pure-cellulose filter paper, rag paper, and wood-pulp paper) were mechanically soiled with pulverized charcoal in a standardized procedure to make model samples. These samples were characterized microscopically and by means of lightness measurements using a multi-spectral imaging system. A prototype laser workstation with Laser Class I conditions for the operator was used for the cleaning experiments. For 10-ns laser pulses at a wavelength of 532 nm, a set of laser parameters was established for a successful cleaning of the samples avoiding damage to the paper substrate. Single- and multi-pulse illumination conditions were tested. An extensive microscopic analysis after laser treatment of the cleaned parts of the samples provided insight into the remaining soiling on the surface and in the bulk of the paper material. Wien, Austria Berger Horn 2009 Research in book and paper conservation in Europe - a state of the art 978-3-85028-490-5 171 188 2016-02-19 OPUS4-23634 Beitrag zu einem Tagungsband Pentzien, Simone; Conradi, Andrea; Krüger, Jörg The influence of paper type and state of degradation on laser cleaning of artificially soiled paper Lasers can be a supplemental tool for restorers to overcome some of the limitations of traditional dry cleaning techniques for works of art on paper. The laser working range has to be optimized allowing for safe removal of contamination and limitation of damage to the substrate. This paper addresses the influence of paper type and state of degradation on laser working range. Three types of new paper (pure cellulose, bleached pulp paper, rag paper) were degraded and characterized with respect their degree of polymerization. Laser-induced damage thresholds of new and degraded paper were determined using SEM and viscometry. Additionally, artificially soiled model samples were made using two kinds of soiling, namely pulverized charcoal and soot-blackened standard test dust. Cleaning thresholds of soiled paper samples were evaluated. A working range for all combinations of paper and soiling between 0.05 J/cm2 and 0.5 J/cm2 was found for the application of 8-ns laser pulses at 532 nm wavelength. London, UK Taylor & Francis 2011 LACONA VIII - Lasers in the conservation of artworks (Proceedings) 978-0-415-58073-1 LACONA VIII - Lasers in the Conservation of Artworks VIII Sibiu, Romania 21.09.2009 25.09.2009 59 65 2016-02-19 OPUS4-20059 Beitrag zu einem Sammelband Krüger, Jörg; Pentzien, Simone; Conradi, Andrea; Lußky, Katharina; Engel, P. Günter Wiedemann, ; Udo Klotzbach, ; Ulrich Bauer-Bornemann, Laserreinigung von künstlich verschmutzten europäischen Papieren des 19. Jahrhunderts Diese Arbeit beschreibt die Laserreinigung von gebräuchlichen Papieren des 19. Jahrhunderts in Kombination mit zwei Schmutzvarianten. Aufgrund der weiten Verbreitung in Bibliotheken und Kunstsammlungen wurden Hadernpapier und holzhaltiges Papier ausgewählt. Als Referenz diente Whatman-Filterpapier. Zur künstlichen Verschmutzung wurden Zeichenkohle oder Standardschmutz (Standard Test Dust SAE J 726 fine, mit Flammruß im Verhältnis 20:1 gemischt) mit Hilfe von Pinsel und Staubsauger jeweils auf die drei Papierarten aufgetragen und in den Faserverbund eingesaugt. Die Nutzung von Modellproben erweist sich für grundlegende Untersuchungen als vorteilhaft, da das Vorhandensein hinreichend großer Flächen (gleichartiger Objekte) für einen Vergleich mit Ergebnissen klassischer Reinigungstechniken unabdingbar ist. Die preiswerten Proben erlauben darüber hinaus auch die Anwendung zerstörender Analysetechniken. Für die Laserreinigungsexperimente wurde ein Nd:YAG-Laser mit Impulsdauern in der Größenordnung von 10 ns bei 532 nm Wellenlänge und einer Repetitionsrate von 500 Hz verwendet. Die Laser-Bearbeitungsstation erlaubt die flächige Bearbeitung von Objekten, wobei der Laserstrahl bewegt wird. Der Laser wird mittels Computer ferngesteuert und unter Klasse-1-Sicherheitsbedingungen betrieben. Bei der Untersuchung der Modellproben wurde jeweils die Anzahl der Impulse pro Probenstelle sowie die Laser-Energiedichte variiert. Ziel der Arbeiten war die Ermittlung eines Laser-Arbeitsbereiches für die Reinigung der verschiedenen Papierproben. Die Modellobjekte wurden vor und nach der Laserbehandlung mittels lichtmikroskopischer, rasterelektronenmikroskopischer und colorimetrischer Analysemethoden untersucht. Stuttgart Fraunhofer IRB Verl. Deutsche Bundesstiftung Umwelt (DBU) 2009 Laseranwendung in Restaurierung und Denkmalpflege - Grundlagen - Chancen - Perspektiven 978-3-8167-8106-6 Tagung "Laseranwendung in Restaurierung und Denkmalpflege" Osnabrück, Deutschland 2009-01-30 2009-01-31 177 189 2016-02-19 OPUS4-22155 Zeitschriftenartikel Pentzien, Simone; Conradi, Andrea; Koter, Robert; Krüger, Jörg Cleaning of artificially soiled paper using nanosecond, picosecond and femtosecond laser pulses Cleaning of cultural assets, especially fragile organic materials like paper, is a part of the conservation process. Laser radiation as a non-contact tool offers prospects for that purpose. For the studies presented here, paper model samples were prepared using three different paper types (pure cellulose, rag paper, and wood-pulp paper). Pure cellulose serves as reference material. Rag and woodpulp paper represent essential characteristics of the basic materials of real-world artworks. The papers were mechanically soiled employing pulverized charcoal. Pure and artificially soiled paper samples were treated with laser pulses of 28 fs (800 nm wavelength) and 8-12 ns (532 nm) duration in a multi pulse approach. Additionally, the cellulose reference material was processed with 30 ps (532 nm) laser pulses. Damage and cleaning thresholds of pure and soiled paper were determined for the different laser regimes. Laser working ranges allowing for removal of contamination and avoiding permanent modification to the substrate were found. The specimens prior and after laser illumination were characterized by light-optical microscopy (OM) and scanning electron microscopy (SEM) as well as multi spectral imaging analysis. The work extends previous nanosecond laser cleaning investigations on paper into the ultra-short pulse duration domain. Berlin Springer 2010 Applied physics A 101 2 441 446 10.1007/s00339-010-5809-7 2016-02-19 OPUS4-23705 Beitrag zu einem Tagungsband Pentzien, Simone; Conradi, Andrea; Koter, Robert; Krüger, Jörg Engel, P.; Schirò, J.; Larsen, R.; Moussakova, E.; Kecskeméti, I. Cleaning of soiled paper model samples using short and ultrashort laser pulses Paper is one of the most important materials representing and witnessing human culture particularly as a carrier medium for text and image. As soiling hampers the reception of information, paper cleaning techniques are needed. Traditional mechanical and chemical cleaning methods are used by conservator-restorers. In some cases, a classical cleaning procedure of paper objects yields unsatisfactory results or a conventional treatment is even impossible. Especially, fragile paper objects cause problems due to mechanical instabilities. Laser cleaning as a non-contact method might be a way to overcome some of the limitations of classical cleaning techniques. Laser parameters have to be chosen to achieve removal of the soiling without influencing the artwork. Any immediate as well as long-term effects causing an irreversible change of the artwork have to be avoided. At present, most laser applications are found in stone and metal conservation, while laser treatment of complex organic materials like paper is still not fully developed for application in conservators' workshops. This contribution describes recent work of pulsed laser cleaning of soiled model samples. Pure cellulose, rag paper and wood-pulp paper were mechanically soiled with pulverized charcoal in a standardized procedure to make model samples representing essential characteristics of contaminated real-world artworks. Afterwards, model samples were cleaned using short and ultrashort laser pulses in the nanosecond and femtosecond time domain, respectively. An extensive analysis of the model samples after laser treatment using an optical microscope and a multi-spectral imaging system allows a comparison of the cleaning results obtained with both laser sources. Vienna, Austria Verlag Berger, Horn 2011 Conference 'New Approaches to Book and Paper Conservation - Restoration' (Proceedings) 978-3-85028-518-6 Conference 'New Approaches to Book and Paper Conservation - Restoration' Horn, Austria 09.05.2011 11.05.2011 519 532 2016-02-19 OPUS4-43526 Beitrag zu einem Tagungsband Schmidt, Birgit Angelika; Pentzien, Simone; Conradi, Andrea; Krüger, Jörg; Roth, C.; Beier, O.; Hartmann, A.; Grünler, B. Decontamination of biocidal loaded wooden artworks by means of laser and plasma processing Many wooden artworks are contaminated by DDT (dichlorodiphenyltrichloroethane) as a result of a surface treatment by means of the liquid preservative Hylotox-59©. It was used until the end of the 1980s. DDT crystal structures are formed on the wood surfaces by the "blooming" of chlorine compounds. In addition to an aesthetic disturbance, it is assumed that DDT represents a health risk. Even decades after applying, the toxins in the wood preservatives are still detectable because they are of low volatility in many wood samples. 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. Non-contact procedures using laser and plasma appear reasonable to remove the DDT crystals. During the experiments, health and safety issues for the operator have to be taken into account. The removal of DDT was evaluated employing femtosecond and nanosecond laser radiation and cold atmospheric plasma techniques with different working gases (air, nitrogen, and argon). Before laser application, a chlorine measurement representing the DDT density on the wooden surface 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 the depletion rate. Additionally, a documentation and characterization of the sample surface is performed before and after laser and plasma treatment using optical microscopy (OM). For plasma processing with various systems a chlorine measurement is done by gas chromatographic-mass spectrometry (GCMS) analysis. Toruń NCU Press 2017 Proceedings of the International Conference LACONA XI 978-83-231-3875-4 11th Conference on Lasers in the Conservation of Artworks Kraków, Poland 20.09.2016 23.09.2016 241 251 10.12775/3875-4.17 2017-12-21 OPUS4-42564 Zeitschriftenartikel Schmidt, Birgit Angelika; Pentzien, Simone; Conradi, Andrea; Krüger, Jörg Femtosecond and nanosecond laser decontaminations of biocidal-loaded wooden artworks Until the end of the 1980s many wooden artworks underwent surface treatment by liquid preservatives, e.g. Hylotox-59. DDT (dichlorodiphenyltrichloroethane) crystal structures are formed on the wooden surfaces by the "blooming" of chlorine compounds by time. In addition to an aesthetic disturbance, it is assumed that DDT represents a health risk. Therefore, the removal of DDT crystals from the surfaces is requested. Contaminated wood with natural biocide ageing, gilded and wood carved elements and wooden samples with paint layers were provided by the Schlossmuseum Sondershausen, Germany. Laser cleaning on selected surface areas on the objects was done by means of femtosecond and nanosecond laser pulses. For the same object, cleaning results using 30-fs laser pulses at 800 nm wavelength are compared to findings utilizing 10-ns laser pulses at 1064 nm wavelength. Before and after laser treatment, chlorine measurements at the same surface position were done by X-ray fluorescence analysis (XRF) as an indicator for the presence of DDT. In this way, pointwise chlorine depletion rates can be obtained for the different pulse duration regimes and wavelengths. Additionally, the object surfaces were examined using optical microscopy and multi spectral imaging analysis. Springer 2017 Applied Physics A 123 EMRS Spring Meeting 2017, Symposium X “New frontiers in laser interaction: from hard coatings to smart materials" Strasbourg, France 22.05.2017 26.05.2017 11 Article 696, 1 9 10.1007/s00339-017-1316-4 2017-10-19 OPUS4-58821 Zeitschriftenartikel Pérez Blanes, H.; Ghiasi, Pouria; Sandkühler, J.; Yesilcicek, Yasemin; Pentzien, Simone; Conradi, Andrea; Prinz, Carsten; Al-Sabbagh, Dominik; Thünemann, Andreas; Özcan Sandikcioglu, Özlem; Witt, Julia High CO2 reduction activity on AlCrCoCuFeNi multi-principal element alloy nanoparticle electrocatalysts prepared by means of pulsed laser ablation Noble metal-free nanoparticles (NPs) based on multi-principal element alloys (MPEAs) were synthesized using a one-step pulsed laser ablation in liquids (PLALs) method for the electrochemical reduction of CO2. Laser ablation was performed in pure water or poly-(diallyldimethylammonium chloride) (PDADMAC)-containing an aqueous solution of Al8Cr17Co17Cu8Fe17Ni33 MPEA targets. Transmission electron microscopy (TEM) measurements combined with energy dispersive X-ray (EDX) mapping were used to characterize the structure and composition of the laser-generated MPEA nanoparticles (MPEA-NPs). These results confirmed the presence of a characteristic elemental distribution of a core-shell phase structure as the predominant NP species. The electrocatalytic performance of the laser-generated MPEA-NPs was characterized by linear sweep voltammetry (LSV) demonstrating an enhanced electrocatalytic CO2 activity for PDADMAC-stabilized NPs. The findings of these investigations indicate that MPEAs have great potential to replace conventional, expensive noble metal electrocatalysts. Elsevier B.V. 2023 Journal of Materials Research and Technology 24 9434 9440 urn:nbn:de:kobv:b43-588218 10.1016/j.jmrt.2023.05.143 https://creativecommons.org/licenses/by/4.0/deed.de 2023-11-15 OPUS4-59401 Zeitschriftenartikel Pérez Blanes, H.; Ghiasi, P.; Sandkühler, J.; Yesilcicek, Yasemin; Pentzien, Simone; Conradi, Andrea; Prinz, Carsten; Al-Sabbagh, Dominik; Thünemann, Andreas.F.; Ozcan, Ozlem; Witt, Julia High CO2 reduction activity on AlCrCoCuFeNi multi-principal element alloy nanoparticle electrocatalysts prepared by means of pulsed laser ablation Noble metal-free nanoparticles (NPs) based on multi-principal element alloys (MPEAs) were synthesized using a one-step pulsed laser ablation in liquids (PLALs) method for the electrochemical reduction of CO2. Laser ablation was performed in pure water or poly-(diallyldimethylammonium chloride) (PDADMAC)-containing an aqueous solution of Al8Cr17Co17Cu8Fe17Ni33 MPEA targets. Transmission electron microscopy (TEM) measurements combined with energy dispersive X-ray (EDX) mapping were used to characterize the structure and composition of the laser-generated MPEA nanoparticles (MPEA-NPs). These results confirmed the presence of a characteristic elemental distribution of a core-shell phase structure as the predominant NP species. The electrocatalytic performance of the laser-generated MPEA-NPs was characterized by linear sweep voltammetry (LSV) demonstrating an enhanced electrocatalytic CO2 activity for PDADMAC-stabilized NPs. The findings of these investigations indicate that MPEAs have great potential to replace conventional, expensive noble metal electrocatalysts. Elsevier BV 2023 Journal of Materials Research and Technology 24 9434 9440 urn:nbn:de:kobv:b43-594018 10.1016/j.jmrt.2023.05.143 https://creativecommons.org/licenses/by/4.0/deed.de 2024-01-23