TY - CONF A1 - Maierhofer, Christiane A1 - Brink, Arne A1 - Röllig, Mathias A1 - Wiggenhauser, Herbert T1 - Impulse Thermography for locating voids and honeycombing in concrete structures supported by numerical simulations T2 - 11. Bauklimatisches Symposium ; 11th Symposium of Building Physics CY - Dresden, Germany DA - 2002-09-26 PY - 2002 SP - 242 EP - 252 PB - TU CY - Dresden AN - OPUS4-1828 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Maierhofer, Christiane A1 - Brink, Arne A1 - Röllig, Mathias A1 - Wiggenhauser, Herbert ED - Binda, L. T1 - Transient thermography for non-destructive investigation of building structures in the near surface region T2 - RILEM TC 177-MDT Workshop on On-Site Control and Non-Destructive Evaluation of Masonry Structures CY - Mantova, Italy DA - 2001-11-12 KW - Non-destructive testing KW - Masonry KW - Concrete KW - Impulse thermography KW - Plaster KW - Laminates PY - 2003 SN - 2-912143-34-9 N1 - Serientitel: RILEM proceedings – Series title: RILEM proceedings IS - 26 SP - 251 EP - 261 PB - RILEM Publications CY - Bagneux, France AN - OPUS4-1829 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Helmerich, Rosemarie A1 - Niederleithinger, Ernst A1 - Milmann, Boris A1 - Wöstmann, Jens A1 - Röllig, Mathias A1 - Feldmann, Rüdiger A1 - Täljsten, B. ED - Masoud Motavalli, T1 - Near surface mounted CFRP-rods - preparation of reinforcing measures and quality control by means of non-destructive testing T2 - 4th International Conference on FRP Composites in Civil Engineering (CICE2008) CY - Zurich, Switzerland DA - 2008-07-22 PY - 2008 SN - 978-3-905594-50-8 SP - 1 EP - 6 AN - OPUS4-17747 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Walter, Keven A1 - Hoch, Dominik P. A1 - Hertweck, Leon A1 - Balasubramanian, Kannan A1 - Geisler, Jonas A1 - Röllig, Mathias A1 - Neubert, Tilmann J. A1 - Börner, Hans G. T1 - Unlocking the Essence of Lignin: High‐Performance Adhesives That Bond via Thiol‐Catechol Connectivities and Debond on Electrochemical Command N2 - AbstractThe next generation of adhesives requires effective debonding capabilities that can be triggered on demand to enable advanced circular repair and recycling strategies. A new class of lignin‐inspired, two‐component (2K) structural adhesives offers bonding strengths of up to 20 MPa and clean, on‐command electrochemical debonding within 5–30 min. The debonding is induced by a distinct electrochemical oxidation of thiol‐catechol connectivities (TCCs) within the entire adhesive network, enforcing rapid and clean adhesive failure on the cathodic substrate side. The TCC‐functionalities are formed during curing by a thiol‐quinone Michael‐type polyaddition, reacting polyester‐based trithiols with tris‐quinones as lignin‐inspired minimal building blocks. The structural adhesive can be fine‐tuned by adjusting the formulation. The addition of carbon black and ionic liquids facilitates the desired electrochemical transformation of TCC‐catechols to TCC‐quinones. Applying only 9 V for 5–30 min, leads to clean debonding with 72–86% loss of shear strength. A comprehensive study of curing, bonding, and debonding behavior by rheological, spectroscopic, and electrochemical investigations reveals the debonding mechanism by correlating catechol oxidation to adhesive performance. The electrochemical debonding capability of TCC‐structural adhesives is demonstrated in a functional prototype, where on‐command detachment of a cover glass from a display device is achieved within 6.5 min. KW - Lignin-inspired KW - Electrochemical-Debonding KW - Thiol-Catechol-Connectivity (TCC) KW - Michael-Type Polyaddition KW - On-Demand Adhesive Failure PY - 2025 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-639674 DO - https://doi.org/10.1002/adma.202510463 SN - 0935-9648 SP - 1 EP - 10 PB - Wiley VHC-Verlag CY - 69451 Weinheim AN - OPUS4-63967 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Tobias, Charlie A1 - Gehrenkemper, Lennart A1 - Bernstein, Thomas A1 - Schlau, Sven A1 - Simon, Fabian A1 - Röllig, Mathias A1 - Meermann, Björn A1 - von der Au, Marcus T1 - Development of a fully automated slurry sampling introduction system for GF-AAS and its application for the determination of cadmium in different matrices N2 - element analysis, offering high sensitivity and precision. However, its effectiveness is limited by sample preparation challenges for solid samples like soils and microplastics. Traditional methods include sample preparation, such as digestion, which is time-consuming and involves reagents, like acids, contributing to measurement uncertainty and higher carbon footprints. Slurry sampling allows direct analysis of suspensions, offering a more efficient alternative. However, maintaining suspension stability is challenging, requiring robust autosampler systems to streamline the process and enhance analytical performance. Results: We present a novel autosampler extension for slurry sample introduction into GF-AAS. This system ensures suspension stability with a stirring device and closed vessels to prevent evaporation and contamination, incorporating a cooling unit to reduce solvent and analyte losses. It installs and removes in minutes without additional connections. Validation with cadmium analysis in BAM-U110 (Soil) and BAM-H010 (ABS) showed high reliability. For BAM-U110 (Soil), we achieved recovery rates of 94 % ± 13 % in water suspension. The recovery rate for BAM-H010 (ABS) was 104 % ±11 % in acetonitrile suspension. These results demonstrate the system’s robustness, versatility, and accuracy for different matrices. Significance: The autosampler extension helps solve key problems in trace element analysis of solid samples, making the process faster and more accurate. It works well with complex materials, making it useful for areas like microplastic or nanoparticle analysis. This improvement also helps meet regulations for monitoring environ mental and polymer samples, offering a reliable and flexible tool for high-throughput analysis with fewer errors. KW - Slurry AAS KW - Soil KW - Cd PY - 2025 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-618531 DO - https://doi.org/10.1016/j.aca.2024.343460 SN - 0003-2670 VL - 1335 SP - 1 EP - 7 PB - Elsevier BV AN - OPUS4-61853 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Kühnemund, Lutz A1 - Kautek, Wolfgang A1 - Röllig, Mathias ED - Plieth, W. T1 - Pulse Laser Depassivation at 532 nm of Titanium in NaCl Electrolytes T2 - Jahrestagung. Gesellschaft Deutscher Chemiker, Fachgruppe Angewandte Elektrochemie CY - Freiberg, Germany DA - 1999-09-29 KW - Pulsed-Laser-Depassivated Titanium PY - 2000 SN - 3-924763-85-2 N1 - Serientitel: GDCh-Monographien – Series title: GDCh-Monographien IS - 18 SP - 117 EP - 124 PB - Ges. Deutscher Chemiker CY - Frankfurt am Main AN - OPUS4-842 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Tang, Chi-Long A1 - Seeger, Stefan A1 - Röllig, Mathias T1 - Improving the comparability of FFF-3D printing emission data by adjustment of the set extruder temperature N2 - Fused filament fabrication (FFF) is a material extrusion-based technique often used in desktop 3D printers. Polymeric filaments are melted and are extruded through a heated nozzle to form a 3D object in layers. The extruder temperature is therefore a key parameter for a successful print job but also one of the main emission driving factors as harmful pollutants (e.g., ultrafine particles) are formed by thermal polymer degradation. The awareness of potential health risks has increased the number of emission studies in the past years. However, studies usually refer their calculated emission data to the printer set extruder temperature for comparison purposes. In this study, we used a thermocouple and an infrared camera to measure the actual extruder temperature and found significant temperature deviations to the displayed set temperature among printer models. Our result shows that printing the same filament feedstocks with three different printer models and with identical printer set temperature resulted in a variation in particle emission of around two orders of magnitude. A temperature adjustment has reduced the variation to approx. one order of magnitude. Thus, it is necessary to refer the measured emission data to the actual extruder temperature as it poses a more accurate comparison parameter for evaluation of the indoor air quality in user scenarios or for health risk assessments. KW - Ultrafine particles KW - Infrared thermography KW - Thermocouple KW - Indoor air quality KW - FFF-3D printer PY - 2023 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-572842 DO - https://doi.org/10.1016/j.aeaoa.2023.100217 VL - 18 SP - 100217 PB - Elsevier Ltd. CY - Amsterdam, Niederlande AN - OPUS4-57284 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Röllig, Mathias T1 - Thermografie zur Vergleichbarkeit von Emissionsmessung im 3D-Druck N2 - Die Bedeutung der Extrudertemperatur bei kleinen Desktop 3D Druckern der Fused Filament Fabrication (FFF) Technologie auf die Emission von ultrafeinen Partikeln im Druckbetrieb ist nicht zu unterschätzen. Allerdings zeigen kommerzielle 3D Drucker häufig eine systematische Temperaturabweichung zum Sollwert, d.h. die eingestellte Temperatur weicht von der tatsächlichen Temperatur ab. Da die Partikelemission meist temperaturabhängig ist, ist eine genaue Messung der tatsächlichen Extrudertemperatur für den Vergleich von Emissionsdaten aus unterschiedlichen Druckermodellen relevant. T2 - DGZfP Jahrestagung 2025 CY - Berin, Germany DA - 26.05.2025 KW - Thermografie KW - Fused Filament Fabrication (FFF) KW - Ultrafeine Partikel KW - Extrudertemperatur KW - Temperaturmessung PY - 2025 AN - OPUS4-63328 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Maierhofer, Christiane A1 - Harrer, Andrea A1 - Nies, Daniel A1 - Pulz, Robert A1 - Röllig, Mathias A1 - Rehmer, Birgit T1 - Untersuchung von Transport- und Schädigungsprozessen in Keramiken und mineralischen Baustoffen mit lokal und global angeregter aktiver Thermografie N2 - In diesem Beitrag wird die Entwicklung eines aktiven Thermografieverfahrens zur zeit- und ortsaufgelösten in-situ und Echtzeit-Visualisierung von Transport- und Schädigungsprozessen für Anwendungen in Industrie und Umwelt vorgestellt. Das Verfahren ermöglicht unter Verwendung verschiedener thermischer Anregungsquellen u.a. die Bestimmung der thermischen Materialeigenschaften von Keramiken und trockenen und feuchten mineralischen Baustoffen. Schädigungsprozesse in Keramiken können in-situ visualisiert werden. Weiterhin werden Messergebnisse vorgestellt, die während des kapillaren Feuchtetransports in Naturstein erfasst wurden und diesen abbilden können. T2 - Sensoren und Messsysteme 2010 - 15. ITG/GMA-Fachtagung CY - Nürnberg, Deutschland DA - 2010-05-18 PY - 2010 SN - 978-3-8007-3260-9 IS - Paper 116 SP - 658 EP - 663 PB - VDE Verlag GmbH CY - Berlin, Offenbach AN - OPUS4-21949 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Maierhofer, Christiane A1 - Krankenhagen, Rainer A1 - Röllig, Mathias A1 - Rehmer, Birgit A1 - Gower, M. A1 - Baker, G. A1 - Lodeiro, M. A1 - Aktas, A. A1 - Knaszovicka, L. A1 - Blahut, A. A1 - Monte, C. A1 - Adibekyan, A. A1 - Gutschwager, B. T1 - Characterisation of artificial defects in CFRP and GFRP sheets designed for energy applications using active thermography N2 - The increased use of fibre-reinforced plastic (FRP) composites for improved efficiency and reliability in energy related applications e.g. wind and marine turbine blades, nacelles, oil and gas flexible risers, also increases the demand for innovative non-destructive testing technologies. Thus, in order to achieve increased acceptance of suited and optimized non-destructive testing (NDT) methods in industry, the European Metrology Research Programme (EMRP) project ENG57 Validated Inspection Techniques for Composites in Energy Applications (VITCEA) deals with the development and validation of innovative NDT technologies. In this contribution, results concerning thermographic investigations at test specimens during tensile loading and active thermography testing after tensile loading are presented. Additionally, the determination of the optical properties (relative transmittance and directional spectral emissivity) of CFRP and GFRP test specimens is described. T2 - Conference QIRT 2016 CY - Gdansk, Poland DA - 04.07.2016 KW - Active thermography KW - CFRP KW - GFRP KW - Validation of methods PY - 2016 UR - http://qirt.gel.ulaval.ca/archives/qirt2016/papers/076.pdf DO - https://doi.org/10.21611/qirt.2016.076 SN - 2371-4085 SP - Paper 076, 527 EP - 536 CY - Quebec, Canada AN - OPUS4-37512 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Maierhofer, Christiane A1 - Reischel, Mercedes A1 - Krankenhagen, Rainer A1 - Myrach, Philipp A1 - Steinfurth, Henrik A1 - Röllig, Mathias T1 - Anwendungsbereiche und Grenzen der Blitzthermografie - Entwicklung eines anwendungsnahen Standards N2 - Ein anwendungsnaher Standard zur aktiven Thermografie mit Blitzanregung soll die Auswahl und Bewertung der geeigneten Messtechnik, die Durchführung der Messungen sowie die Auswertung und Darstellung der Messdaten in Abhängigkeit vom Prüfproblem festlegen. In diesem Beitrag werden zum einen Möglichkeiten zur Charakterisierung der Blitzlichtanregung sowie alternative Anregungstechniken vorgestellt. Zum anderen wurden für verschiedene Prüfprobleme Referenzprobekörper entwickelt, die systematische Untersuchungen zur Optimierung der Messparameter ermöglichten. T2 - DACH Jahrestagung 2012 CY - Graz, Österreich DA - 17.09.2012 PY - 2012 AN - OPUS4-32798 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Maierhofer, Christiane A1 - Krankenhagen, Rainer A1 - Röllig, Mathias T1 - Application of thermographic testing for the characterization of impact damage during and after impact load N2 - Low-velocity impact damages were monitored in-situ using an infrared camera before, during and after Impact load. Thermal images were recorded as a function of time at the front side (impact) as well as at the rear side of the plates using a high frame rate. In CFRP and GFRP specimens with different thicknesses and made of various types of fibers and matrix materials, different kind of damages were observed. The sizes of the heated areas being related to the damages and the amount of energy dissipated into heat was determined quantitatively as a function of impact energy and are a measure of the resistance of the different materials against impact load. KW - Laminates KW - Impact behaviour KW - NDT KW - Thermal analysis PY - 2019 DO - https://doi.org/10.1016/j.compositesb.2019.106899 SN - 1359-8368 SN - 1879-1069 VL - 173 SP - 106899, 1 EP - 17 PB - Elsevier AN - OPUS4-48881 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -