TY - CONF A1 - Günzel, Stephan A1 - Mair, Georg T1 - Safety assessment of hydrogen gas storage systems N2 - In this lecture, the safety assessment of hydrogen gas storage systems is presented using the example of composite pressure vessels. The main element is a probabilistic approval approach based on five steps. Firstly, the testing and evaluation of properties at the beginning of life are shown. Secondly, methods for artificial aging and the effect on the residual strength are presented. Thirdly, testing against dedicated accidents is introduced. Fourthly, effects on the surveillance of production quality are discussed. Finally, degradation and the end of life are estimated. Background information and examples are given for each step. The assessment presented is a method applicable for many safety-related systems. T2 - Joint European Summer School 2021 on Fuel Cell, Electrolyser, and Battery Technologies CY - Online meeting DA - 12.09.2021 KW - Safety KW - Hydrogen KW - Wasserstoff KW - Bewertung KW - Assessment PY - 2021 AN - OPUS4-59905 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Neitsch, Marcel T1 - Die Gefahrgutregeln der BAM - Wichtige Handlungsanleitungen für die Praxis rund um Verpackungen, IBC und Großverpackungen für den Transport gefährlicher Güter N2 - Im Vortrag werden die Gefahrgutregeln der BAM vorgestellt, die für den Bereich Verpackungen, Großpackmittel und Großverpackungen relevant sind. Es wird ein Ausblick auf zukünftige Entwicklungen gegeben. T2 - 18. Gefahrgut-Technik-Tage CY - Berlin, Germany DA - 18.11.2021 KW - BAM-GGR KW - Gefahrgutregeln KW - Gefahrgutverpackungen PY - 2021 AN - OPUS4-58896 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Fini, E. H. A1 - Poulikakos, L. A1 - de Claville Christiansen, J. A1 - Schmidt, Wolfram A1 - Parast, M. M. T1 - Toward sustainability in the built environment: An integrative approach N2 - The built environment significantly impacts the health of individuals and populations in various ways. The health and durability of the built environment are intertwined with availability ofnaturally occurring and man-made resources and their supply chains. Therefore, resource con­ servation is a key to ensure sustainability of built environments. Many industrial wastes can be turned into valuable resources for reuse in construction of the built environment. For instance, biowaste (woody/ leafy biomass and animal waste) have been used to make construction adhesives (Fini et al., 2011), some urban wastes have been used in road construction (Poulikakos et al., 2017; Schmidt et al., 2021), end of life plastics and polymers have made their way to roadway construction, bio-oils and algae harvested from wastewater treatment plants has been used to make antiaging for outdoor building elements to mitigate UV aging (Kabir et al., 2021); sulfur has been used as an extender in asphalt and recycled mineral powders such as silica and alumina have been used to increase strength and durability against acidic compounds (Fini et al., 2019). These are just a few examples of recycling venues with beneficial uses in the built environment. The construction and operation of the built environment and the traffic that it attracts or facilitates significantly contribute to the emis­ sion of greenhouse gasses (GHG) and cause air pollution. The direct and indirect impacts of GHG and air pollutants on the environment and so­ cieties have been weil established. The built environment can be used as a powerful platform not only for recycling and resource conservation but also to remove near-ground gaseous contaminants. This can be done via tailored design and engineering of adsorptive construction materials via recycling of waste materials. For instance, advanced sorbent systems can be made for removing C02, H2S, and formaldehyde from air. This re­ quires tailored sorbent design, topology optimization, and catalytic conversion of collected gaseous compounds to name a few. This special issue covers innovative materials, methods, and man­ agement practices which aim to simultaneously address durability ofthe built environment, air quality, resource conservation, and supply chain resilience. Such innovative materials, methods, and management prac­ tices will transform the built environment into not only an active contributor to no waste, no pollution for healthy environment, but also a medium that converts the waste and pollution into beneficial products for use in the built environment, thereby promoting resource conser­ vation. Followings are examples of topics that the special issue is interested in: • Venuses to advance resource conservation specifically via novel ap­ proaches in the built environment. • Innovative construction materials for passive or active adsorption of harmful gaseous emissions to conserve air, energy, and water. • Advanced materials, methods, and management practices to pro­ mote well-being of the built environment. • Smart buildings to promote resource conservation. • Research convergence in the built environment for zero waste, zero pollution economy. KW - Impacts KW - Resource PY - 2021 U6 - https://doi.org/10.1016/j.resconrec.2021.105676 VL - 172 SP - 1 EP - 2 PB - Elsevier AN - OPUS4-58402 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Weinel, Kristina A1 - Hesse, René A1 - Agudo Jacome, Leonardo A1 - Gonzalez-Martinez, I. T1 - Complex artificial features on a TEM transparent membrane N2 - The phenomenon of expelling nanomaterial from microparticles of different materials, such as Au, WO3 or B2O3 under the influence of a convergent electron beam (CB) of a transmission electron microscope (TEM) was reviewed by Ignacio Gonzalez-Martinez [1]. Converging the e-beam in a TEM means that a high amount of energy enters the microparticle at a very local place and interact with the matter. Obviously, during the convergent beam protocol, no imaging with the electron beam is possible, but at the end, nanoparticles with different appearances lie down next to the microparticle while its size is reduced. Hence, there is a blind spot in the observation, which we want to fill, as we want to help clarify the nature of the expelling phenomenon. One hypothesis that explains the phenomenon is the so-called damage (of the microparticle) induced by an electric field (DIEF). Within this theory, the material is ionized and expelled in form of ionic waves. Our aim is therefore to fabricate specimens with artificial microlandscapes, as schematically exemplified in figure 1a), using the focused ion beam (FIB) and micromanipulators, as experimental setups to follow the paths of the expelled material. As a first step towards the fabrication of such specimen, we make experimental feasibility studies for each fabrication method, FIB structuring with Ga+ ion beam and micromanipulated microparticle deposition. Bridges (gray regions in Fig. 1) are created by milling a commercially available electron transparent membrane (silicon oxide or carbon) of a Cu-TEM grid. Platinum or carbon walls (blue features in Fig. 1) are built to stand on those bridges. Microparticles (yellow sphere in Fig. 1) of gold or other material are deposited in the center of the bridges. Figure 2a) shows four square holes (black area) and between them the residual silicon oxide membrane bridges (dark grey). On top of the bridges, walls (light grey) are deposited. The width of the bridges is different, the walls overlap the holes as well as the distance between the walls is very small, so these and other parameters need to be optimized. Figure 2b) shows a square hole (black) with bridges (white) on the right side on top of a carbon membrane (grey). There are still some obstacles which needs to be eliminated. For instance, the deposition process of the walls is not reliable as visible at the wall on top where a hole arises instead of a wall. These studies are still in progress and the results are further discussed in terms of the applicability for the DIEF experiment in the TEM. T2 - 4th EuFN and FIT4NANO Joint Workshop / Meeting CY - Vienna, Austria DA - 27.09.2021 KW - Transmission electron microscope (TEM) KW - Sample preparation KW - Micromanipulation KW - Focussed ion beam growth KW - Nano-landscape PY - 2021 AN - OPUS4-58259 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Franco de Carvalho, J. M. A1 - Defàveri, K- A1 - Castro Mendes, J. A1 - Schmidt, Wolfram A1 - Kühne, Hans-Carsten A1 - Fiorotti Peixoto, R. A. T1 - Influence of particle size-designed recycled mineral admixtures on the properties of cement-based composites N2 - In this work, engineered recycled mineral admixtures were obtained from four different industrial residues: basic oxygen furnace slag, iron ore tailings, quartz mining tailings and quartzite mining tailings. The grinding performance was evaluated in two different programs and the characterization included chemical and mineralogical composition, particle morphology, and physical properties. Performance evaluations were carried out in blended pastes and mortars, including flow properties, hydration kinetics, soundness, pozzolanic activity, and compressive strength. Coarser-than-cement admixtures allowed better flow performance, greater dimensional stability and more economical production, while finer-thancementn admixtures improved mechanical performance by both filler effect and cementing activity. KW - Engineered recycled mineral admixtures KW - Rheology KW - Hydration kinetics KW - Basic oxygen furnace slag KW - Iron ore tailings KW - Mining tailings PY - 2021 U6 - https://doi.org/10.1016/j.conbuildmat.2020.121640 SN - 0950-0618 VL - 272 SP - 1 EP - 13 PB - Elsevier Ltd. AN - OPUS4-58255 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Muth, Thilo T1 - MassIVE MSV000089620 - Critical Assessment of MetaProteome Investigation (CAMPI): A multi-lab comparison of established workflows N2 - Metaproteomics, the study of the collective proteome within a microbial ecosystem, has substantially grown over the past few years. This growth comes from the increased awareness that it can powerfully supplement metagenomics and metatranscriptomics analyses. Although metaproteomics is more challenging than single-species proteomics, its added value has already been demonstrated in various biosystems, such as gut microbiomes or biogas plants. Because of the many challenges, a variety of metaproteomics workflows have been developed, yet it remains unclear what the impact of the choice of workflow is on the obtained results. Therefore, we set out to compare several well-established workflows in the first community-driven, multi-lab comparison in metaproteomics: the critical assessment of metaproteome investigation (CAMPI) study. In this benchmarking study, we evaluated the influence of different workflows on sample preparation, mass spectrometry acquisition, and bioinformatic analysis on two samples: a simplified, lab-assembled human intestinal sample and a complex human fecal sample. We find that the same overall biological meaning can be inferred from the metaproteome data, regardless of the chosen workflow. Indeed, taxonomic and functional annotations were very similar across all sample-specific data sets. Moreover, this outcome was consistent regardless of whether protein groups or peptides, or differences at the spectrum or peptide level were used to infer these annotations. Where differences were observed, those originated primarily from different wet-lab methods rather than from different bioinformatic pipelines. The CAMPI study thus provides a solid foundation for benchmarking metaproteomics workflows, and will therefore be a key reference for future method improvement. [doi:10.25345/C5SX64D9M] [dataset license: CC0 1.0 Universal (CC0 1.0)] KW - Benchmarking KW - Data set PY - 2021 U6 - https://doi.org/10.25345/c5sx64d9m PB - University of California CY - San Diego AN - OPUS4-58087 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Wilke, Olaf T1 - Harmonised test standard EN 16516 - common approach for all building products for interiors N2 - The presentation gives general information about the European Standard EN 16516 “Construction products – Assessment of release of dangerous substances – Determination of emissions into indoor air”. This test standard was developed based on the mandate M/366 of the European commission and is a horizontal reference method for the determination of volatile organic compounds (VOC) from different classes of construction (building) products. Specific test conditions are to be selected by the product TCs (technical committees) in a way that a product is tested under its intended condition of use. The test is based on the use of emission test chambers which are operated at constant air change rate and climate (23°C, 50 % r.h.) over 28 days. The standard defines the conditions and requirements for the measurement including loading factor, air change rate, sampling, analysis and calculation of emission rates of the substances. A 30 m³ reference room is described which is used to calculate air concentrations from the determined emission rates. The standard EN 16516 enables the evaluation of construction products regarding their emissions into indoor air under defined and comparable conditions. The evaluation includes the determination of identified target compounds, non-identified target compounds, volatile carcinogenic compounds and the sum values TVOC, TSVOC and R. T2 - UBA Conference - Limiting health impacts of construction products regarding VOC CY - Online meeting DA - 20.04.2021 KW - Building products KW - EN 16516 KW - Emisson testing KW - Construction products PY - 2021 AN - OPUS4-58079 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Kapoor, M. A1 - Sørensen, J. D. A1 - Ghosh, S. A1 - Thöns, Sebastian T1 - Decision theoretic approach for identification of optimal proof load with sparse resistance information N2 - Proof load testing may be performed to confirm the reliability of the bridge for an existing classification or to prove the reliability for a higher classification. In this paper, a probabilistic decision analysis approach is applied to the scenario for the evaluation of target proof load in the situation where information on the bridge resistance model is lacking. In this case, the resistance model is established by proof loading and taking very basic prior knowledge into account. The decision scenario is modelled in the context of the proof load test planner who shall choose the required load level for assessment of a bridge. The choice of the load level depends on the risks due to the testing and the expected benefit gain from the test. Information acquired about the loading response from monitoring during the proof load testing is modelled by taking basis in the model uncertainty formulation. The optimal proof load level for classification of a single lane, simply supported bridge of 8m span subjected to live load from very heavy (gross weight > 80 tons) transport vehicles was calculated. The optimal proof load level was identified as leading to a positive expected benefit gain to the decision maker while also satisfying target reliability criteria for remaining service life. The analysis was performed for the evaluation of bridge performance with respect to five classifications of very heavy transport vehicles with different vehicle weights and configurations. T2 - 10th International Conference on Bridge Maintenance, Safety and Management (IABMAS) CY - Sapporo, Japan DA - 11.04.2021 KW - Proof load testing KW - Probabilistic decision analysis KW - Bridge resistance model PY - 2021 SN - 978-0-429-27911-9 U6 - https://doi.org/10.1201/9780429279119-104 SP - 789 EP - 797 PB - CRC Press CY - Boca Raton, Florida AN - OPUS4-57879 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Brasse, Y. A1 - Colbus, A. A1 - Tavernaro, Isabella A1 - Kraegeloh, Annette T1 - Delivery of macromolecular drugs via coated silica particles N2 - Modified silica particles are of great interest in biomedical applications, since they can be used e.g. as drug carriers, fluorescent sensors, or multimodal labels in bioimaging. Here we present novel approaches for drug labeled and loaded silica nanoparticles. T2 - NanoMedicine International Conference 2021 CY - Milan, Italy DA - 20.10.2021 KW - Silica nanoparticles KW - Drug delivery KW - Particle modification KW - Cell studies PY - 2021 AN - OPUS4-57728 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Prager, Jens A1 - Lugovtsova, Yevgeniya A1 - Bulling, Jannis A1 - Held, Mathias A1 - Klärner, M. A1 - Winkler, T. A1 - Kroll, L. T1 - Akustische Bestimmung der Werkstoffparameter faserverstärkter Kunststoffe mittels geführter Wellen N2 - Akustische Verfahren eignen sich hervorragend zur Bestimmung der Werkstoffeigenschaften. Die Verfügbarkeit derartiger Verfahren ist vor allem für Kunststoffe wichtig, da deren Eigenschaften stark abhängig vom jeweiligen Herstellungsprozess und vom Alterungszustand sind. Exakte und vollständige Werte sind daher in Datenbanken oder von Herstellern nur begrenzt zu finden. Insbesondere die Entwicklung von Methoden zur Charakterisierung faserverstärkter Kunststoffe (FKV) ist nach wie vor Gegenstand der Forschung. Hier müssen anisotropiebedingt mehrere Kennwerte bestimmt werden. Da FKV zumeist als dünnwandige Bauteile zum Einsatz kommen, können die Werkstoffparameter aus den Dispersionseigenschaften der Lamb-Wellen, die sich in diesen Strukturen ausbreiten, abgeleitet werden. Dazu ist eine räumliche Abtastung des sich ausbreitenden Schallfelds erforderlich. In der vorliegenden Untersuchung wird dieser Ansatz für die relativ neue Werkstoffklasse der faserverstärkten Thermoplaste angewendet. Diese zeichnet ein ausgeprägtes Dämpfungsverhalten und eine Anisotropie der Materialparameter aus. Dazu wurde das Schallfeld im Ultraschallbereich mit einem Laser-Doppler-Vibrometers vermessen. Rechnerisch bestimmte Dispersionskurven wurden dann an die gemessenen Werte angepasst, womit die richtungsabhängigen Materialparameter bestimmt werden konnten. Im Vortrag wird das Messverfahren vorgestellt und auf spezielle Probleme, die sich z.B. aus dem Dämpfungsverhalten des Werkstoffs ergeben, eingegangen. Ausgewählte gemessene Werte werden mit den Ergebnissen von Referenzverfahren verglichen. T2 - DAGA 2021 - 47. Jahrestagung für Akustik CY - Vienna, Austria DA - 15.08.2021 KW - Ultraschall KW - Composites KW - Thermoplastische Kunststoffe PY - 2021 AN - OPUS4-57344 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Prager, Jens A1 - Lugovtsova, Yevgeniya A1 - Bulling, Jannis A1 - Held, Mathias A1 - Klärner, M. A1 - Winkler, T. A1 - Kroll, L. T1 - Akustische Bestimmung der Werkstoffparameter faserverstärkter Kunststoffe durch Auswertung der Dispersionseigenschaften geführter Wellen N2 - Akustische Verfahren eignen sich hervorragend zur Bestimmung der Werkstoffeigenschaften. Die Verfügbarkeit derartiger Verfahren ist vor allem für Kunststoffe wichtig, da deren Eigenschaften stark abhängig vom jeweiligen Herstellungsprozess und vom Alterungszustand sind. Exakte und vollständige Werte sind daher in Datenbanken oder von Herstellern nur begrenzt zu finden. Insbesondere die Entwicklung von Methoden zur Charakterisierung faserverstärkter Kunststoffe (FKV) ist nach wie vor Gegenstand der Forschung. Hier müssen anisotropiebedingt mehrere Kennwerte bestimmt werden. Da FKV zumeist als dünnwandige Bauteile zum Einsatz kommen, können die Werkstoffparameter aus den Dispersionseigenschaften der Lamb-Wellen, die sich in diesen Strukturen ausbreiten, abgeleitet werden. Dazu ist eine räumliche Abtastung des sich ausbreitenden Schallfelds erforderlich. In der vorliegenden Untersuchung wird dieser Ansatz für die relativ neue Werkstoffklasse der faserverstärkten Thermoplaste angewendet. Diese zeichnet ein ausgeprägtes Dämpfungsverhalten und eine Anisotropie der Materialparameter aus. Dazu wurde das Schallfeld im Ultraschallbereich mit einem Laser-Doppler-Vibrometers vermessen. Rechnerisch bestimmte Dispersionskurven wurden dann an die gemessenen Werte angepasst, womit die richtungsabhängigen Materialparameter bestimmt werden konnten. Im Vortrag wird das Messverfahren vorgestellt und auf spezielle Probleme, die sich z.B. aus dem Dämpfungsverhalten des Werkstoffs ergeben, eingegangen. Ausgewählte gemessene Werte werden mit den Ergebnissen von Referenzverfahren verglichen. T2 - DAGA 2021 - 47. Jahrestagung für Akustik CY - Vienna, Austria DA - 15.08.2021 KW - Ultraschall KW - Composites KW - Thermoplastische Kunststoffe PY - 2021 SP - 52 EP - 55 PB - Deutsche Gesellschaft für Akustik (DEGA) CY - Berlin AN - OPUS4-57340 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Heinekamp, Christian A1 - Emmerling, Franziska A1 - Braun, Thomas T1 - Metal fluoride surfaces by protonation with surface immobilized HF N2 - Lewis-acidic zirconium or chromium fluoride surfaces on different aluminium oxide or fluoride substrates. T2 - CRC 1349 Symposium 2021 CY - Berlin, Germany DA - 25.11.2021 KW - HF KW - Heterogeneous catalysis PY - 2021 AN - OPUS4-57226 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Kühne, Hans-Carsten A1 - Hüsken, Götz A1 - Mundra, Shishir A1 - Sander, C. A1 - Obermann, S. T1 - Die Betondickglasfenster des Glockenturms am Eiermannbau der Kaiser-Wilhelm-Gedächtniskirche N2 - Die Kaiser-Wilhelm-Gedächtniskirche (KWG) gilt als eine der wichtigsten Sehenswürdigkeiten Berlins in der City West und als ein herausragendes Beispiel für die „Dalle de Verre“ Verglasungen in sakralen Gebäuden. Der vorliegende Beitrag widmet sich der Fassade und den Glasfenstern des neuen Glockenturms, wobei die beschriebenen Szenarien aufgrund der annähernd gleichen Bauweise der restlichen neuen Baukörper in weiten Teilen starke Analogien aufweisen und insofern übertragbar sind. T2 - Workshop Kulturguterhaltung - Vom Dampfkessel zu Nanomaterialien CY - Berlin, Germany DA - 17.11.2021 KW - Kaiser-Wilhelm-Gedächtniskirche KW - Betondickglasfenster KW - Instandsetzung KW - Elektrochemische Realkalisierung PY - 2021 VL - 3 SP - 125 EP - 140 PB - Druckerei G. Bohm CY - Berlin AN - OPUS4-57092 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Kühne, Hans-Carsten T1 - Die Kandelaber des Ensembles am Charlottenburger Tor N2 - Auf der Charlottenburger Brücke entstand mit dem Charlottenburger Tor und den beiden Kandelabern von 1905 bis 1908 ein repräsentatives Ensemble von Einzelbauwerken. Für die architektonische Wirkung des Charlottenburger Tores waren die beiden ca. 22 Meter hohen Kandelaber auf der Charlottenburg zugewandten Seite des Tores bedeutsam. Die Stiftung Denkmal ließ die Kandelaber seit Mai 2007 mit dem Ziel rekonstruieren, dem Tor, seiner Umgebung und der Straße des 17 Juni den historischen Gesamteindruck wiederzugeben. Im Rahmen der Rekonstruktion wurde die Grundsatzentscheidung getroffen, dass die Wiederherstellung der komplett zerstörten und auch nicht mehr in Fragmenten vorhandenen Kandelaber nicht unter Anwendung der Bautechnik von 1900 durchgeführt werden sollte. Die Zielsetzung war viel mehr, mit moderner Bautechnik die Anmutung der Kandelaber von 1903 wiederherzustellen, die in Verbindung mit anderen baulichen Elementen, wie der Charlottenburger Brücke und des Charlottenburger Tores, den historischen Gesamtkomplex bilden. T2 - Workshop Kulturguterhaltung - Vom Dampfkessel zu Nanomaterialien CY - Berlin, Germany DA - 17.11.2021 KW - Charlottenburger Tor KW - Kunststein KW - Hydrophobierung KW - Bildhauerbeton PY - 2021 VL - 3 SP - 97 EP - 105 PB - Druckerei G. Bohm CY - Berlin AN - OPUS4-57091 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Mangoufis-Giasin, I. A1 - Piqué, O. A1 - Khanipour, Peyman A1 - Mayrhofer, K. J. J. A1 - Calle-Vallejo, F. A1 - Katsounaros, I. T1 - Different promoting roles of ruthenium for the oxidation of primary and secondary alcohols on PtRu electrocatalysts N2 - This study shows remarkably different features between the oxidation of secondary and primary C₃-C₅ alcohols. The oxidation of primary alcohols is controlled by the oxidative removal of blocking adsorbates, such as CO, formed after the dissociative adsorption of alcohol molecules. Conversely, secondary alcohols do not undergo dissociative adsorption and therefore their oxidation is purely controlled by the energetics of the elementary reaction steps. In this respect, a different role of ruthenium is revealed for the electrooxidation of primary and secondary alcohols on bimetallic platinum-ruthenium catalysts. Ruthenium enhances the oxidation of primary alcohols via the established bifunctional mechanism, in which the adsorption of (hydr)oxide species that are necessary to remove the blocking adsorbates is favored. In contrast, the oxidation of secondary alcohols is enhanced by the Ru-assisted stabilization of an O-bound intermediate that is involved in the potential-limiting step. This alternative pathway enables the oxidation of secondary alcohols close to the equilibrium potential. KW - Electrocatalysis KW - Electrochemical energy conversion KW - Direct alcohol fuel cells KW - Alcohol electrooxidation KW - Secondary alcohols KW - 2-propanol oxidation KW - Electrochemical real-time mass spectrometry KW - Density functional theory PY - 2021 U6 - https://doi.org/10.1016/j.jcat.2021.05.028 SN - 0021-9517 VL - 400 SP - 166 EP - 172 PB - Elsevier CY - San Diego, Calif. AN - OPUS4-56999 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Sobisch, Lydia-Yasmin A1 - Schreiber, Frank T1 - Biocide resistance evolution of corrosion causing sulfate reducing bacteria N2 - SRB are environmentally and industrially important microorganisms. The disadvantage of their metabolic activity (e.g. sulfate reduction) results in the formation of toxic sulfide that leads to microbial influenced corrosion. SRB have been responsible for biocorrosion of ferrous metal. One of mitigation strategy is the use of biocides. However, it has been shown that various bacteria develop antimicrobial resistance due to excessive use of biocides. Thus, a deeper understanding of the evolution of biocide resistance of SRB is necessary. Three commonly used biocides, THPS, BAC, and GLUT were applied to investigate the susceptibility of Desulfovibrio alaskensis G20.The minimum inhibitory and bactericidal concentration and the killing kinetics of the three biocides was determined. These results will be used to conduct evolution experiments to determine the evolution of resistance towards biocides of SRBs. The outcome of this work can be helpful to improve the management of MIC treatments. T2 - Panel, Pitch & Popcorn by EUROMIC CY - Online meeting DA - 21.06.2021 KW - Biocide KW - Evolution KW - Mircobially influcenced corrosion KW - Sulfate reducing bacteria PY - 2021 AN - OPUS4-56940 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Mitu, M. A1 - Razus, D. A1 - Schröder, Volkmar T1 - Laminar burning velocities of hydrogen-blended methane-air and natural gas-air mixtures, calculated from the early stage of p(t) records in a spherical vessel N2 - The flammable hydrogen-blended methane–air and natural gas–air mixtures raise specific safety and environmental issues in the industry and transportation; therefore, their explosion characteristics such as the explosion limits, explosion pressures, and rates of pressure rise have significant importance from a safety point of view. At the same time, the laminar burning velocities are the most useful parameters for practical applications and in basic studies for the validation of reaction mechanisms and modeling turbulent combustion. In the present study, an experimental and numerical study of the effect of hydrogen addition on the laminar burning velocity (LBV) of methane–air and natural gas–air mixtures was conducted, using mixtures with equivalence ratios within 0.90 and 1.30 and various hydrogen fractions rH within 0.0 and 0.5. The experiments were performed in a 14 L spherical vessel with central ignition at ambient initial conditions. The LBVs were calculated from p(t) data, determined in accordance with EN 15967, by using only the early stage of flame propagation. The results show that hydrogen addition determines an increase in LBV for all examined binary flammable mixtures. The LBV variation versus the fraction of added hydrogen, rH, follows a linear trend only at moderate hydrogen fractions. The further increase in rH results in a stronger variation in LBV, as shown by both experimental and computed LBVs. Hydrogen addition significantly changes the thermal diffusivity of flammable CH4–air or NG–air mixtures, the rate of heat release, and the concentration of active radical species in the flame front and contribute, thus, to LBV variation. KW - Hydrogen KW - Methane KW - Natural gas KW - Laminar burning velocity (LBV) KW - Closed vessel combustion PY - 2021 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:b43-569083 SN - 1996-1073 VL - 14 IS - 22 SP - 1 EP - 16 PB - MDPI CY - Basel AN - OPUS4-56908 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Kinne, R. W. A1 - Gunnella, F. A1 - Kunisch, E. A1 - Heinemann, S. A1 - Nies, B. A1 - Maenz, S. A1 - Horbert, V. A1 - Illerhaus, Bernhard A1 - Huber, R. A1 - Firkowska-Boden, I. A1 - Bossert, J. A1 - Jandt, K. D. A1 - Sachse, A. A1 - Bungartz, M. A1 - Brinkmann, O. T1 - Performance of calcium phosphate cements in the augmentation of sheep vertebrae - An ex vivo study N2 - Oil-based calcium phosphate cement (Paste-CPC) shows not only prolonged shelf life and injection times, but also improved cohesion and reproducibility during application, while retaining the advantages of fast setting, mechanical strength, and biocompatibility. In addition, poly(L-lactideco-glycolide) (PLGA) fiber reinforcement may decrease the risk for local extrusion. Bone defects (diameter 5 mm; depth 15 mm) generated ex vivo in lumbar (L) spines of female Merino sheep (2–4 years) were augmented using: (i) water-based CPC with 10% PLGA fiber reinforcement (L3); (ii) Paste-CPC (L4); or (iii) clinically established polymethylmethacrylate (PMMA) bone cement (L5). Untouched (L1) and empty vertebrae (L2) served as controls. Cement performance was analyzed using micro-computed tomography, histology, and biomechanical testing. Extrusion was comparable for Paste-CPC(-PLGA) and PMMA, but significantly lower for CPC + PLGA. Compressive strength and Young’s modulus were similar for Paste-CPC and PMMA, but significantly higher compared to those for empty defects and/or CPC + PLGA. Expectedly, all experimental groups showed significantly or numerically lower compressive strength and Young’s modulus than those of untouched controls. Ready-to-use Paste-CPC demonstrates a performance similar to that of PMMA, but improved biomechanics compared to those of water-based CPC + PLGA, expanding the therapeutic arsenal for bone defects. O, significantly lower extrusion of CPC + PLGA fibers into adjacent lumbar spongiosa may help to reduce the risk of local extrusion in spinal surgery. KW - Sheep KW - PMMA KW - Calcium phosphate bone cement KW - Oil-based KW - Ready-to-use KW - Water-based KW - Micro-CT KW - Compressive strength KW - Young’s modulus PY - 2021 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:b43-569072 SN - 1996-1944 VL - 14 IS - 14 SP - 1 EP - 12 PB - MDPI CY - Basel AN - OPUS4-56907 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Harsha, A. P. A1 - Wäsche, Rolf A1 - Joyce, T. J. T1 - Friction and wear of two polyethylenes under different tribological contact conditions N2 - Tribological properties of ultrahigh-molecular weight polyethylene (UHMWPE) and cross-linked polyethylene (XLPE) were studied in two different wear modes. Firstly, reciprocating sliding wear studies under non-conformal contact investigated the effects of counterface surface roughness (polished, lapped and ground) of Ti6Al4V on the friction and wear of the polyethylenes. Secondly, two-body abrasive wear studies in conformal contact against different abrasive grit size papers were also carried out to ascertain the wear sensitivity of the polyethylenes under these adverse conditions. Wear mechanisms were studied using optical and scanning electron micrographs. The results of the reciprocating sliding wear studies showed that surface roughness of the counterface influenced friction and wear characteristics although no correlation was found between the coefficient of friction and specific wear rate. XLPE demonstrated wear sensitivity, particularly under severe abrasive wear condition. The results indicated that the performance of the polyethylenes greatly depends upon the tribological system under which it is operating. KW - Abrasive wear KW - Polyethylene KW - Reciprocating sliding wear KW - Surface roughness KW - Wear mechanism PY - 2021 U6 - https://doi.org/10.1177/0967391120920130 SN - 0967-3911 SN - 1478-2391 VL - 29 IS - 5 SP - 393 EP - 404 PB - Sage Publishing CY - London AN - OPUS4-56903 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Zhang, Kun A1 - Pan, L. A1 - Li, J. A1 - Lin, C. T1 - What is the mechanism of the fiber effect on the rheological behavior of cement paste with polycarboxylate superplasticizer? N2 - Compared with most common construction materials, fiber reinforced cementitious materials are well known to exhibit better physical, working and mechanical properties. In this study, three fibers were selected: polypropylene fiber (PPF) and polyvinyl alcohol fiber (PVAF), which represented synthetic fibers, and sisal fiber (SF), which represented natural fibers. Effects of these fibers on the flowability, rheological properties, and adsorption behavior of the cement paste with polycarboxylate superplasticizer (PCE) were investigated. Furthermore, the above experimental results were verified by measuring the contact angle of the fiber with water and PCE solution and the apparent morphology of the fiber. Results revealed that the addition of fibers significantly reduces the fluidity of the cement paste, while the yield stress and plastic viscosity of the cement paste increase with the addition of fibers. From the contact angle and scanning electron microscope, the surface of SF was relatively rough, and the contact angle of SF with water or PCE solution was the smallest. It can be concluded that the plant fiber has a significant influence on the fluidity and rheology of cement paste. KW - Cement paste KW - Polycarboxylate superplasticizer KW - Polypropylene fiber KW - Polyvinyl alcohol fiber KW - Sisal fiber KW - Rheological property KW - Fluidity KW - Adsorption PY - 2021 U6 - https://doi.org/10.1016/j.conbuildmat.2021.122542 SN - 0950-0618 VL - 281 SP - 1 EP - 11 PB - Elsevier CY - Amsterdam AN - OPUS4-56893 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -