TY - CONF A1 - Omar, Hassan T1 - Probing Nanoscale Relaxation Behavior in Thin Polymer Films N2 - The investigations into the complicated effects of film thickness on bulk properties of thin polymer films has yielded conflicting results. The reduction in molecular mobility, and with it an increase in the glass transition temperature, for thin films of poly (bisphenol A carbonate) (PBAC) was assigned to the formation of an adsorbed layer. The adsorbed layer was obtained by washing away the loosely bounded chains using a good solvent. Next, using atomic force microscopy (AFM), the thickness of each sample was measured after annealing for various times at three different annealing temperatures. The growth of this adsorbed layer was shown to deviate from the previously reported 2-step mechanism seen for other polymers. For PBAC, after very long annealing times at high temperatures the thin films were dewetted, where segments of the adsorbed layer were removed from the substrate. T2 - Royal Society of Chemistry (RSC) Poster CY - Online meeting DA - 28.02.2023 KW - Thin films KW - Adsorbed Layer KW - Broadband dielectric spectroscopy KW - Atomic force microscopy KW - Growth Kinetics PY - 2023 AN - OPUS4-57196 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Fontana, P. T1 - Healthier life with eco-innovative components for housing constructions N2 - The project has developed a variety of new multifunctional and flexible building components for a healthier indoor environment. [H] house solutions are durable, energy efficient, safe and affordable. They are suitable for use in new buildings and for renovation. [H] house solutions cover aspects of long service life, reduced maintenance and long-term improvement of energy efficiency. T2 - H-House Abschluss-Kolloquium, Dauerausstellung am Demonstrator-Gebäude CY - Warsaw, Poland DA - 23.08.2017 KW - Building materials KW - Beton KW - UHPC PY - 2017 AN - OPUS4-43003 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rachmatulin, Natalia A1 - Gardei, André A1 - von Werder, Julia A1 - Meng, Birgit A1 - Süßmuth, J. A1 - Gerdes, A. T1 - Funktionalisierung von Polymerfasern - ein Beitrag der Tensidchemie für dauerhafte zementgebundene Werkstoffe N2 - Im Gegensatz zur Druckfestigkeit weisen zementgebundene Werkstoffe i. a. nur geringe Zugfestigkeiten auf. Ein Weg, Zugfestigkeiten zementgebundener Werkstoffe zu erhöhen und Rissbildung aufgrund von Zugspannungen zu verringern, besteht in der Einarbeitung von Fasern, die diese Spannungen aufnehmen. Häufig eingesetzt werden Stahlfasern, obwohl synthetische Polymerfasern leichter und meist beständiger gegenüber chemischen Angriffen und Korrosion sind. Die Polymerfasern zeigen allerdings meist einen deutlich schwächeren Haftverbund, was an der hydrophoben Faseroberfläche liegt. Um nun eine Anbindung der Fasern an die mineralische Matrix zu erreichen, müssen die Faseroberflächen modifiziert werden, ohne dass die mechanischen Eigenschaften negativ beeinflusst werden. Eine Herausforderung besteht somit in einer Oberflächenmodifikation durch eine schonende Behandlung der Fasern zur Erzeugung von anbindungsfähigen Gruppen. Durch eine Behandlung von modifizierten Fasern mit geeigneten Polymerlösungen werden die Oberflächeneigenschaften verändert und erlauben eine Anbindung an die Zementsteinmatrix. Der Einsatz von Tensiden als grenzflächenaktive Verbindungen ermöglicht in diesem Zusammenhang eine Vermittlung zwischen Polymeroberflächen und mineralischen Werkstoffen. T2 - HighTechMatBau CY - Berlin, Germany DA - 31.01.2018 KW - Zementgebundene Baustoffe KW - Lichtmikroskopie KW - Röntgen-3D-Computertomographie KW - Einzelfaserdurchzugsversuch KW - Windkanal KW - Fasermodifikation KW - Oberflächenfunktionalisierung KW - Grenzflächenaktive Verbindung PY - 2018 AN - OPUS4-44652 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Werner, Tiago T1 - Structural integrity of cold spray repaired aerospace components N2 - Components in aircrafts are usually replaced when critical defects are present. An alternative approach is repairing using gas dynamic cold spraying: metal particles are shot at a surface at supersonic speeds to selectively rebuild damaged material. Compared to other material-deposition techniques, its advantage is the small thermal impact on the component, preserving its mechanical properties. Component-repair can save considerable amounts of energy and resources. However, its industrial application at large scale needs reproducible, good repair-material properties to guarantee a safe component life. The aim of this project is the development of safe, automatized repair-procedures considering the mechanical fatigue properties of the repair. T2 - ICEAF VII Conference 2023 CY - Spetses, Greece DA - 21.06.2023 KW - Cold Spray KW - Repair KW - Fatigue KW - Fatigue Crack Growth KW - Slow Strain Rate Testing PY - 2023 AN - OPUS4-57784 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Kolmangadi, Mohamed Aejaz T1 - Confinement induced relaxations and phase behavior of a nanoconfined ionic liquid crystal N2 - Liquid crystalline mesophases in nanoconfinement exhibit intriguing phase transition behaviors and relaxation dynamics. Here in, we investigate the molecular dynamics and electrical conductivity of a linear shaped guanidinium based ILC confined in self-ordered nano porous alumina oxide membranes of pore size ranging from 180nm down to 25nm by employing broadband dielectric spectroscopy (BDS) and calorimetry. Calorimetric investigation reveals a complete suppression of the columnar – isotropic transition, while the plastic crystalline – columnar transition temperature decreases with inverse pore size and deviates from the Gibbs – Thomson equation. For the bulk case, BDS detects two relaxation modes in the crystalline phase, the  relaxation and the α1 relaxation, and two relaxation modes in the columnar phase, the α2 and α3 relaxation. For the confined case, all relaxation modes slow down compared to the bulk. However, for the least pore size (25 nm), the α2 relaxation is absent. We discuss the possible molecular origins of the different relaxation modes observed. For the bulk ILC, a clear jump of 4 orders of magnitude in the absolute values of DC conductivity occurs at the transition from the plastic crystalline to hexagonal columnar phase, for the confined ILC, this transition is smooth. DC conductivity is reduced for the confined case, except for the 25nm, where the values is similar to the bulk. T2 - 11th IDS conference 2022 CY - San Sebastian, Spain DA - 03.09.2022 KW - Ionic Liquid crystals KW - Nanoconfinement KW - Conductivity PY - 2022 AN - OPUS4-55879 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rübner, Katrin T1 - Investigation on the structure of silica/polyurethane nanocomposites N2 - Inorganic-organic nanocomposites are synthesised from polyethylene glycol with an average molar mass of 600 g/mol containing colloidal silica (silicic acid) and diphenyl methane diisocyanate as compact and foamed materials according to the European patent EP1414880. Beside the macroscopic properties, the pore structure and the structure of the polymer matrix of the silica/polyurethane nanocomposites with varying silica contents were studied. T2 - 8th International Symposium on the Characterisation of Porous Solids CY - Edinburgh, Scotland DA - 11.06.2008 PY - 2008 AN - OPUS4-16445 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rübner, Katrin T1 - Pore structure of concrete with recycling aggregates N2 - Processed building rubble containing about 90 % of crushed concrete can be used as recycling aggregates. The reuse for the production of new high-grade concrete requires a knowledge of the engineering properties as well as the pore structure of These materials. Two recycling aggregates and the concretes made with them were studied. T2 - 33th International Geological Congress (IGC) Symposium on Mineral Resources - Constructions Materials (MRC) CY - Oslo, Norway DA - 06.08.2008 PY - 2008 AN - OPUS4-16778 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Jakubcová, Petra T1 - Leichtgranulate aus heterogenem Bauschutt zur Herstellung von Beton N2 - Untersucht wird die Entwicklung einer Technologie zur Herstellung hochwertiger Leichtgranulate (Blähgranulate) mit definierten Produkteigenschaften aus heterogenen Bau- und Abbruchabfällen, Anwendung der Granulate als leichte Gesteinskörnung im Beton und die Möglichkeit des rohstofflichen Recyclings mineralischer Bauabfälle T2 - r2- Statusseminar 2011, "Innovative Technologien für Ressourceneffizienz - rohstoffintensive Produktionsprozesse, Fraunhofer-Institut CY - Berlin, Germany DA - 26.10.2011 PY - 2011 AN - OPUS4-24717 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schwettmann, K. T1 - Post carbon road - The endless cycle of bitumen reuse N2 - In Germany, the reuse of asphalt has a long tradition. Since the 1980s, the reclaimed asphalt has been recycled achieving a reuse rate of around 90% and thus a very high value in the last years. In the future, instead of the amount, the quality of the reclaimed asphalt will be more important because the recycled asphalt will be reused again and again. Thus, these asphalt mixes are in the second or even third cycle of reuse. Concerning this situation, the question arises if asphalt can be reused several times without any loss in quality. An important factor affecting the asphalt quality is the binder bitumen. During the production, construction and service life, the ageing of this binder occurs causing a hardening of the bitumen. To compensate this hardening, additives for the reclaimed asphalt in terms of rejuvenation agents (rejuvenators) gain in importance. With these rejuvenators, the physical properties of bitumen can be modified e.g. the hardness and the stiffness reduced. However, the mechanism of the rejuvenation agents and the effects of the bitumen chemistry are largely unknown because the composition of the products varies very strongly. But with growing knowledge about these mechanisms and effects of the rejuvenation agents, the chemical composition and thus the physical and ageing behavior of bitumen can be targeted modified by the use of suitable rejuvenators. In this work, the actual results of the project Postcarbone road should be presented including investigations about the chemical and physical mechanisms as well as the efficiency of different rejuvenators. Further, a model for the cyclic reuse of bitumen should be developed. Based on this model, the choice of a suitable rejuvenation agent for the considered bitumen or rather asphalt should be possible. The project Postcarbone road (392670763) is funded by the German Research Foundation (DFG). T2 - 7th Eurasphalt and Eurobitume Congress CY - Online meeting DA - 15.06.2021 KW - Bitumen KW - Multiple ageing and rejuvenation KW - Conventional testing KW - DSR KW - BBR KW - FTIR KW - Asphaltene content KW - Column chromatography PY - 2021 AN - OPUS4-53489 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Reinsch, Stefan T1 - A new robot-assisted compositional screening method N2 - The system Na2O.B2O3-SiO2 (NBS) is the basis of many industrial glass applications and therefore one of the most studied systems at all. Glass formation is possible over a wide compositional range, but the system also contains ranges of pronounced phase separation and crystallization tendency. Despite its importance, experimental data are limited to few compositional areas. The general understanding and modelling of glass formation, phase separation, and crystallization in this system would therefore be easier if small step melt series could be studied. The efficient melting of such glass series is now possible with the new robotic glass melting system at the Federal Institute for Materials Research and Testing (BAM, Division Glasses). Using three exemplary joins within this NBS system, the small step changes of glass transition temperature (Tg), crystallization behavior as well as glass density (Roh) was studied. Additionally, experimental Tg and Roh data were compared with their modeled counterparts using SciGlass and a newly developed DFT model, respectively. T2 - Annual meeting of the French Union for Science and Glass Technology (USTV) and the 96th Annual Meeting of the German Society of Glass Technology - USTV-DGG joint meeting. CY - Orléans, France DA - 22.05.2023 KW - Robot-assisted galss melting KW - Sodiumborosilicate glasses KW - Density KW - Glass transformation temperature KW - Property simulation PY - 2023 AN - OPUS4-58724 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Arendt, F. A1 - de Camargo, Andrea Simone Stucchi A1 - Chen, Y.-F. A1 - Gogula, S. A1 - Kilo, M. A1 - Waurischk, Tina T1 - GlasDigital N2 - Der aktuelle Stand des MateriaDigital Projektes GlasDigital wird vorgestellt. Hierbei wird allgemein die Problem- und Zielstellung präsentiert, als auch auf 2 separaten Postern die Ergebnisse. Diese beinhalten zum Einen die smarte Gestaltung der robotergestützten Glasschmelzanlage der BAM inkl. Analytik und zum Anderen die Digitalisierungsbestrebungen im Bereich Glas, d.h. ML-gestützte C-S-P-Simulation, Ontologie für den Werkstoff Glas, Digitaler Zwilling des Gießprozesses. T2 - PMD Vollversammlung 2023 CY - Karlsruhe, Germany DA - 21.09.2023 KW - GlasDigital KW - Ontologie KW - Bildanalyse KW - Simulation KW - Roboter KW - Digitalisierung PY - 2023 AN - OPUS4-58734 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Eggert, Lara T1 - Möglichkeiten im Meerwasserlabor N2 - Das Meerwasserlabor am Eidersperrwerk wurde vorgestellt. Dabei lag der Fokus auf die elektrochemischen Versuchsmöglichkeiten, Monitoring von Versuchsparametern, atmosphärische Korrosion und der Bewuchs an getauchten Prüfkörpern. T2 - H2Mare-Verbundprojekttreffen PtX-Wind & TransferWind CY - Bremerhaven, Germany DA - 09.07.2025 KW - Meerwasserlabor KW - Maritime Korrosion PY - 2025 AN - OPUS4-63766 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Munzke, Dorit T1 - Zustandsüberwachung von Composite-Druckgefäßen mit faseroptischer Sensorik N2 - Funktionsweise, Integration und Messergebnisse von opt. Fasern zur Zustandsüberwachung von Composite-Druckgefäßen. T2 - 3. Workshop Themenfeld Material CY - Berlin, Germany DA - 12.10.2016 KW - Faseroptik KW - Zustandsüberwachung KW - Composite-Druckgefäße PY - 2016 AN - OPUS4-39097 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Waurischk, Tina T1 - New device for inert crack growth measurements in ultra-strong glasses N2 - The practical strength of glasses under ambient conditions is substantially lower compared to its intrinsic strength because of sub-critical crack growth (SCCG) from microscopic flaws. While SCCG is related to the humidity of the ambient atmosphere, leading to stress corrosion phenomena, the detailed kinetics are still not fully understood. To get better insight to the contribution of water on the crack-tip, highly water bearing glasses will be investigated by a new device for inert SCCG-measurements using double cantilever beam (DCB) geometry specimens. This device was designed to investigate the stress intensity factor in modus I and crack velocity in vacuum, but different atmospheres can also be introduced. For validation of the new device, first experiments were performed on microscope slides as well as on a soda-lime silicate and a borosilicate crown glass. The results achieved will be presented in comparison to the published results of Wiederhorn. T2 - 91. Glastechnische Tagung CY - Weimar, Germany DA - 29.05.2017 KW - Double cantilever beam KW - DCB KW - Crack intensity factor KW - Crack growth velocity KW - Glass PY - 2017 AN - OPUS4-40680 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Müller, Ralf T1 - High-temperature laser profilometry N2 - Advanced methods for 3D green density characterization like computed tomography and 3D FE sinter modeling can be utilized for increasing the reliability of sintered components. The experimental in situ observation of sintering, however, is currently restricted to silhouette methods, i.e. heating microscopy. For complex shaped samples, in situ shape screening during shrinkage would allow much better validation of 3D sinter simulation models. Further, by revealing temporary sinter warpage, 3D high-temperature shape screening allows to locate potential defects of complex sintered components. Against this background, BAM developed a testing device for in situ 3D high-temperature shape screening for ceramic and glass-ceramic tapes up to 1000°C [1-3]. Current work is focused on dropping this restriction in sample shape and temperature. The poster illustrates the current state of this work and possible applications of the method e.g. in detecting sinter warpage of metallized glass-ceramic LTCC tapes. T2 - SGT Centenary Conference, & ESG 2016 CY - Sheffield, UK DA - 04. 09. 2016 KW - Laser profilometry KW - 3D High-temperature shape screening KW - Sintering PY - 2016 AN - OPUS4-38320 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Welter, T. T1 - Glass structures with low helium and hydrogen permeability N2 - An efficient energy provision using fuel cells is linked to effecitve hydrogen storage capabilities. Because of its low intrinsic hydrogen permeability, glass has a huge potential in modern concepts of hydrogen storage. Previous studies on oxidic glasses showed an empirical connection between glass composition and gas permeation, which was mainly derived from the behavior of silica glass. In this study we focus on the relationship between topologic (free volume; network polymerization) and thermodynamic (configurational entropy) parameters. The comparison of three glasses within the meta (earth-) alkaline alumino silicate system to silica glass shows that an increase of the atomic packing factor (APF) does not necessarily decrease the permeability. Furthermore, the results suggest a connection between ΔCp at Tg and hydrogen permeability of the glass. All experiments were performed assuming that chemical hydrogen solubiltity in glass is negligible at temperatures well below the glass transition temperature. T2 - 91. Glastechnische Tagung CY - Weimar, Germany DA - 29.05.2017 KW - Hydrogen permeability KW - Glass composition KW - Atomic packing factor KW - Configurational entropy KW - Diffusion coefficient PY - 2017 AN - OPUS4-40488 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marzok, Ulrich T1 - 3D High-temperature laser profilometry during sintering N2 - Most crucial for components of complex shape or heterogeneous micro structure, precise control of sintering has decisive influence on dimensional accuracy, mechanical integrity and reliability of sintered components. In these cases, only in situ 3D high-temperature shape screening during shrinkage would allow revealing temporary sinter warpage and hereby caused potential defects. Against this background, nokra Optische Prüftechnik und Automation GmbH, HTM Reetz GmbH and BAM developed a testing device for in situ 3D shape screening for ceramic and glass-ceramic tapes up to 1000°C by means of high-temperature laser profilometry. The local repeatability of the sample-sensor distance (sample height profile) is 10 µm at 1000°C. Current work is focused on dropping these restrictions in sample shape and temperature. In a second testing device, currently being in development, samples up to 5 cm x 5 cm x 5 cm can be measured at temperatures up to 1500°C.The presentation illustrates the current state of this work and possible applications of the method. T2 - 92. DKG Jahrestagung CY - Berlin, Germany DA - 19. 03. 2017 KW - Laser profilometry KW - 3D High-temperatue shape screening KW - Sintering PY - 2017 AN - OPUS4-40449 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marzok, Ulrich T1 - Measurement of H2 permeability of glasses with VHE powder method N2 - The development of glassy hydrogen barriers requires the determination of low H2 permeabilities. Previous studies and numerical simulations have shown that the VHE powder method (vacuum hot extraction with mass spectrometric gas detection) is suitable for this purpose. The measured isothermal gas emission is fitted to a classical diffusion model for spherical particles from which the diffusion coefficient of the glass is calculated. The H2 permeability is determined by means of the solubility determined from the same measurement data. This presentation is referring to the optimization of the method regarding sample preparation and measurement data evaluation using suitable experimentally determined particle size distributions is reported. For quartz glass, it is shown that the accuracy of classical measuring methods is achieved with the VHE powder method. Furthermore, other examples of substantially gas-tighter glasses are given. T2 - 91. Glastechnische Tagung CY - Weimar, Germany DA - 29.05.2017 KW - Hydrogen permeation KW - Glass KW - Vacuum hot extraction KW - Powder method KW - Diffusion coefficient PY - 2017 AN - OPUS4-40441 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Waurischk, Tina T1 - New device for inert sub-critical crack growth: measurements in crystallized glasses N2 - Compared to its intrinsic strength, the practical strength of glasses is substantially lowered by microscopic flaws. Their sub critical growth from the surface is strongly affected by ambient humidity. A new device was designed to enable the observation of sub critical crack growth (SCCG) in vacuum and controlled atmosphere. It allows measurements in transparent and semi-transparent materials in double cantilever beam (DCB) geometry. The aim of the present work is to study the effect of crystals on crack growth. T2 - 12th International Symposium on Crystallization in Glasses and Liquids CY - Segovia, Spain DA - 10.09.2017 KW - Double cantilever beam KW - DCB KW - Crack intensity factor KW - Crack growth velocity KW - Glass KW - Glass ceramic PY - 2017 AN - OPUS4-41995 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Müller, Thoralf A1 - Rosemann, Paul T1 - Influence of the post-weld surface treatment on the corrosion resistance of duplex stainless steel 1.4062 N2 - The duplex stainless steel 1.4062 (X2CrNiN22-2) is used as alternative material to austenitic stainless steels in the construction industry. The corrosion resistance of welded seams is influenced by the base material, the weld filler material, the welding process and also by the final surface treatment. The scale layer next to the weld seam can be removed by grinding, pickling, electro-polishing or blasting depending on the requested corrosion resistance. Blasted surfaces are often used in the industrial practice due to the faster and cheaper manufacturing process compared to pickled or electro-polished surfaces. Furthermore blasting with corundum-grain is more effective than blasting with glass-beads which also lower the process costs. In recent years, stainless steel surfaces showed an unusually high susceptibility to pitting corrosion after grinding with corundum. For this reason, it is now also questioned critically whether the corrosion resistance is influenced by the applied blasting agent. This question was specifically investigated by comparing grinded, pickled, corundum-grain- and glass-bead-blasted welding seams. Results of the SEM analyses of the blasting agents and the blasted surfaces will be presented and correlated with the results of different corrosion tests (KorroPad-testing and pitting potentials). T2 - Eurocorr 2017 CY - Prague, Czech Republic DA - 03.09.2017 KW - Duplexstahl KW - Korrosion KW - Nichtrostender Stahl KW - Oberflächenbearbeitung KW - Schweißen KW - Strahlen PY - 2017 AN - OPUS4-41915 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -