6.7 Materialsynthese und Design
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Schlagworte
- Spectroscopic ellipsometry (16)
- Haftfestigkeit (8)
- Oxygen evolution reaction (7)
- Centrifugal Adhesion Testing (CAT) (6)
- Klebfestigkeit (6)
- Electron probe microanalysis (EPMA) (5)
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- Electron microscopy (2)
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- Faser-Bragg Gitter (2)
- Friction (2)
- GUM-compliance (2)
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- Hydrogen economy (2)
- Härteprüfung (2)
- IIT (2)
- ISO 14577 (2)
- Instrumented Indentation Testing (2)
- Instrumented indentation testing (2)
- Iridium-titanium mixed oxides (2)
- Kleb- und Haftfestigkeit (2)
- Laser-induced periodic surface structures (LIPSS) (2)
- Magneto-optischer Sensor (2)
- Mapping modifizierter Oberflächen (2)
- Mechanical properties (2)
- Mehr-Proben-Prüfung (2)
- Mehrprobenprüfung (2)
- Mesoporous iridium oxides films (2)
- Mesoporous thin films (2)
- Messtechnik (2)
- Messunsicherheit (2)
- Methodology in metrology (2)
- Methodology in testing (2)
- Mikroskaliert (2)
- Modelling (2)
- Müller-Matrix-Ellipsometrie (2)
- NanoSIMS (2)
- Nanoskaliert (2)
- Normung (2)
- Oberflächenanalytik (2)
- Oberflächengeometrie (2)
- Oberflächenmesstechnik (2)
- Particle morphology (2)
- Polymers (2)
- Porous thin films (2)
- Prüftechnik (2)
- Reference procedures (2)
- Selbstkalibrierung (2)
- Silicon (2)
- Stand der Normung (2)
- Structural anomalies (2)
- Structural inhomogenities (2)
- TCO (2)
- 3D coherence scanning interferometry (CSI) (1)
- ALD-Beschichtung (1)
- Abbildende Ellipsometrie (IE) (1)
- Ablation (1)
- Acidic oxygen evolution reaction (1)
- Adhesion (1)
- Adhesive ALD interlayer (1)
- Adhesive strength determination (1)
- Adhesives (1)
- Adhesives - Determination (1)
- Ageing (1)
- Aluminium (1)
- Anwendung von Kohlenstoffschichten (1)
- Atomic layer deposition (1)
- Auger Electron Spectroscopy (1)
- Automated analysis (1)
- Bacterial adhesion (1)
- Bestimmung der Messunsicherheit (1)
- Bimetallic noble metal nanoparticles (1)
- Biofilm (1)
- Biofilm quantification (1)
- Bulk material (1)
- CAT (1)
- CAT – Technology (1)
- CAT-technology (1)
- Centrifugal Adhesion Testing (CAT) Technologie (1)
- Centrifugal Force (1)
- Centrifugal adhesion testing (1)
- Centrifugal adhesion testing (CAT) (1)
- Certified standards (1)
- Coatings (1)
- Complementary methodology and metrology (1)
- Composite strength (1)
- Compound strength (1)
- Compressive Stress (1)
- Corrosion (1)
- Crystallization (1)
- Curved surfaces (1)
- DIN 50989 Parts 1 – 6 (1)
- DIN 50989, Teile 1 bis 6 (1)
- DIN EN 15870 (1)
- DIN EN ISO/IEC 17025 (1)
- DIN EN ISO/IEC 17025:2018 (1)
- DIN EN ISO/IEC 17025:2018 und GUM Kompatibilität (1)
- Data science (1)
- Decorative coatings on polymer substrates (1)
- Deliberate particle implementation (1)
- Depolarization contrast imaging (DCI) (1)
- Dielectric spectroscopy (1)
- Direct laser interference patterning (1)
- Direct laser writing (1)
- Dynamic testing (1)
- Dünne Schichten (1)
- ECD NiFe-layer (1)
- EN 15870 (1)
- Electrochemistry (1)
- Ellipsometric metrology (1)
- Ellipsometric porosimetry (1)
- Ellipsometrie-Norm (1)
- Epoxy (1)
- Fabrication parameters (1)
- Failure pattern (1)
- Faser-Bragg-Gitter (FBG) (1)
- Femtosecond Laser (1)
- Femtosecond laser processing (1)
- Ferrihydrite (1)
- Fiber Bragg grating (FBG) (1)
- Fiber- Bragg-gratings (FBG) (1)
- Functional coatings (1)
- Functionalization (1)
- Gas monitoring (1)
- Gekrümmte Oberflächen (1)
- Glass transition (1)
- Gleitlinien (1)
- Glue (1)
- Heating oil tanks (1)
- Hematite (1)
- Hierarchical structures (1)
- High pressure (1)
- Hybrid metrology measurement (1)
- Hydrogen evolution reaction (1)
- Härte (1)
- Härteverlauf Schweißnaht (1)
- ISO 23131: 2021 (1)
- Imaging ellipsometry(IE) (1)
- Imaging modifizierter Oberflächen (1)
- In situ AFM (1)
- Instrumented Indentation (IIT) (1)
- Instrumented Indentation Testing (IIT) (1)
- Instrumentierte Eindringprüfung (1)
- Instrumentierte Eindringprüfung (IIT) (1)
- Interlaboratory comparision (1)
- Intrinsic OER activity (1)
- Iron oxide (1)
- Kalottenverfahren (1)
- Klassifizierung von Kohlenstoffschichten (1)
- Klebfestigkeit von Stumpfklebungen (1)
- Kompaktierbarkeit (1)
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- Laborvergleich Härte (1)
- Lateral surface pattern (1)
- Layer thickness of transparent coatings (1)
- Loss module (1)
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- Magneto-optical coupling (MOC) (1)
- Magnetostrictive coating (1)
- Manufacturing (1)
- Material-binding Peptides (1)
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- Mehr-Proben-Prüfverfahren (1)
- Mesoporous films (1)
- Mesoporous iridium-titanium mixed oxides (1)
- Mesoporous mixed metal oxide films (1)
- Messunsicherheit ellipsometrischer Messungen (1)
- Metal coatings (1)
- Metallographie (1)
- Metrology (1)
- Microscopy (1)
- Microstructure (1)
- Mixed Oxides (1)
- Mueller-Matrix Ellipsometry (1)
- Multi-functional coatings for sensors (1)
- Multiple-sample bonding (MSB) (1)
- Multiple-sample handling (MSH) (1)
- Müller-Matrix Ellipsometrie (MM-IE) (1)
- NAP-XPS (1)
- Nano characterization (1)
- Nanoindentation (1)
- Nanoparticle structure (1)
- Niedrigenergie-Polymeren (1)
- Non-destructive ambient analysis (1)
- Normung Ellipsometrie (1)
- Oberflächenprüftechnik (1)
- Optical Constants (1)
- Optical characterization (1)
- Optical fibers (1)
- Optical films (1)
- Optische Konstanten (1)
- Ordered mesoporous carbon (1)
- Oxidation (1)
- PVD-coatings (1)
- PVD-processes (1)
- PVME (1)
- Particles as add-on features (1)
- Particles as imperfections (1)
- Particulate distributions (1)
- Peptide Library (1)
- Phase transitions (1)
- Physical vapour deposition (PVD) (1)
- Plasma activation (1)
- Plasma diagnostics (1)
- Plasma-assisted ALD modification (1)
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- Plastics (1)
- Platinum-ruthenium colloid (1)
- Polarization spectroscopy (1)
- Polycarbonate (1)
- Polyethylene (1)
- Polymer-binding Peptides (1)
- Polypropylene (1)
- Porosity (1)
- Porous layers (1)
- Porous materials (1)
- Primer (1)
- Prüfgeschwindigkeiten (1)
- Pull-off test (1)
- Quality Control (1)
- Rauheit (1)
- Re-crystallization (1)
- Reactive sputtering (1)
- Reference materials (1)
- Reference samples (1)
- Resins (1)
- Ringversuch (1)
- Ringversuch Ellipsometrie (1)
- Round robin test (1)
- Rroughness and step heights (1)
- SEM/EDS (1)
- SEM/EDS/STRATAGem (1)
- SIMS (1)
- SZ2080 negative photo-resist (1)
- Scanning white light interferometry (1)
- Schichtdicke (1)
- Schichtdicken (1)
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- Service life (1)
- Soft-templated mesoporous films (1)
- Solid-binding Peptides (1)
- Spectroscopic Imaging (1)
- Spectroscopy (1)
- Spektrale Ellipsometrie (SE) (1)
- Standardization of Ellipsometry (1)
- Standardization of ellipsometry (1)
- Statistischen Untersuchung (1)
- Storage module (1)
- Structural Health Monitoring (SHM) (1)
- Structural health monitoring (SHM) (1)
- Structural precision (1)
- Stumpfklebungen (1)
- Surface Activation (1)
- Surface analysis (1)
- Surface analytics (1)
- Surface functionalization (1)
- Surface plasmon resonance enhanced ellipsometry (SPREE) (1)
- Surface texture (1)
- Temperature dependent ellipsometry (1)
- Tensile Stress (1)
- Tensile strength of coatings (1)
- Tensile strength of laminates (1)
- Tensile testing machine (TTM) (1)
- Thin epoxy-based films (1)
- Thin film technology (1)
- Titanium (1)
- Titanium dioxide (1)
- ToF SIMS (1)
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- Topometry (1)
- Transmission electron microscopy (1)
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- Validation (1)
- Validation concepts of ellipsometric measurements (1)
- Validierung (1)
- Validierungskonzepte ellipsometrischer Messungen (1)
- Visco-elastic (1)
- Water (1)
- Wear (1)
- Weißlichtinterferenzmikroskopie (WLIM, 3D) (1)
- White Light Interference Microscopy (1)
- White light interference microscopy (1)
- White light interference microscopy(WLIM) (1)
- White light interferometry microscopy (1)
- XRD (1)
- Zirconia: yttria stabilized (1)
- Zugprüfung mittels Zentrifugentechnologie (1)
- Zugprüfung mittels Zugprüfmaschine (1)
- Zweistichproben t Test: (ZPM) (1)
- mechanical properties (1)
- nanoindentation (1)
- performance test (1)
- product specification (1)
- uncertainty (1)
Organisationseinheit der BAM
- 6 Materialchemie (111)
- 6.7 Materialsynthese und Design (111)
- 6.1 Oberflächen- und Dünnschichtanalyse (25)
- 6.2 Material- und Oberflächentechnologien (11)
- 6.6 Physik und chemische Analytik der Polymere (11)
- 8 Zerstörungsfreie Prüfung (6)
- 8.6 Faseroptische Sensorik (6)
- 5 Werkstofftechnik (5)
- 5.1 Mikrostruktur Design und Degradation (4)
- 8.1 Sensorik, mess- und prüftechnische Verfahren (4)
Paper des Monats
- ja (1)
Eingeladener Vortrag
- nein (61)
AbstractTwo‐photon polymerization (2PP) additive manufacturing (AM) utilizes feedstocks of ceramic nanoparticles of a few nanometers in diameter, enabling the fabrication of highly accurate technical ceramic design with structural details as small as 500 nm. The performance of these materials is expected to differ from conventional AM ceramics, as nanoparticles and three‐dimensional printing at high resolution introduce new microstructural aspects. This study applies 2PP‐AM of yttria‐stabilized zirconia to investigate the mechanical response behavior under compressive load, probing the influence of smallest structural units induced by the line packing during the printing process, design of sintered microblocks, and sintering temperature and thereby microstructure. We find a dissipative mechanical response enhanced by sintering at lower temperatures than conventional. The pursued 2PP‐AM approach yields a microstructured material with an increased number of grain boundaries that proposedly play a major role in facilitating energy dissipation within the here printed ceramic material. This microplastic response is further triggered by the filigree structures induced by hollow line packing at the order of the critical defect size of ceramics. Together, these unique aspects made accessible by the 2PP‐AM approach contribute to a heterogeneous nano‐ and microstructure, and hint toward opportunities for tailoring the mechanical response in future ceramic applications.
With the increasing production of renewable energy and concomitant depletion of fossil resources, the demand for efficient water splitting electrocatalysts continues to grow. Iridium (Ir) and iridium oxides (IrOₓ) are currently the most promising candidates for an efficient oxygen evolution reaction (OER) in acidic medium, which remains the bottleneck in water electrolysis. Yet, the extremely high costs for Ir hamper a widespread production of hydrogen (H₂) on an industrial scale. Herein, the authors report a concept for the synthesis of electrode coatings with template-controlled mesoporosity surface-modified with highly active Ir species. The improved utilization of noble metal species relies on the synthesis of soft-templated metal oxide supports and a subsequent shape-conformal deposition of Ir species via atomic layer deposition (ALD) at two different reaction temperatures. The study reveals that a minimum Ir content in the mesoporous titania-based support is mandatory to provide a sufficient electrical bulk conductivity. After ALD, a significantly enhanced OER activity results in dependency of the ALD cycle number and temperature. The most active developed electrocatalyst film achieves an outstanding mass-specific activity of 2622 mA mg(Ir)⁻¹ at 1.60 V(RHE) in a rotating-disc electrode (RDE) setup at 25 °C using 0.5 m H₂SO₄ as a supporting electrolyte.
The performance of functional coatings relies strongly on the stability of the polymer-metal interface. The increasing utilization of multi-material structures in the automotive and aerospace industry necessitates a fundamental understanding of the processes leading to interface degradation for the development of novel strategies to increase corrosion and delamination resistance.
The aim of this project is to investigate the corrosion processes at the buried interface of thin film coated aluminium alloy AA2024-T3 under corrosive and coupled corrosive-mechanical load. A spin coating procedure was developed to synthesize epoxy-like coatings and their nanofiller loaded composites with controlled thickness by layer-by-layer deposition of poly[(o-cresyl glycidyl ether)-co-formaldehyde] and poly-(ethylenimine) bi-layers. Our results indicate that the incorporation of graphene into the epoxy-based coatings leads to the improvement of mechanical and barrier properties. Furthermore, the functional groups play important roles in the interfacial bonding between polymer matrix and the nanofillers. Atomic force microscopy (AFM) results indicate very homogeneous and dense films with a thickness of ~25 nm per bi-layer and the successful integration of the nanofillers into the composite coatings. Ellipsometry measurements of film thickness verified a proportional film growth with the number of deposited layers.
The degradation and delamination behavior of the coating systems was characterized by means of in situ AFM corrosion experiments. Complementary energy dispersive X-ray spectroscopy (EDX) analysis was used to correlate the corrosion and delamination behavior with the different intermetallic particle chemistries and distributions. The presentation will summarize our results on the effect of coating composition and build-up on the local corrosion processes on thin film covered AA2024-T3 aluminium alloys.
The paper addresses the “Functional coatings for mechanical applications: characterization and standardization” and the following points are discussed in more detail:
1. Mechanic alapplications (coatings for tools and components, system features vs. material parameters)
2. Mechanical characterization (instrumented indentation testing (IIT), centrifugal adhesion testing (CAT), state of standardization)
3. Topometric characterization (white light interference microscopy (WLIM, 3D), mechanical stylus (MS, 2D), state of standardization)
4. Optical characterization (spectroscopic ellipsometry (SE), inter-laboratory comparison, state of standardization)
Ellipsometry-based approach for the characterization of mesoporous thin films for H2 technologies
(2021)
Porous thin layer materials are gaining importance in different fields of technology and pose a challenge to the accurate determination of materials properties important for their function. In this work, we demonstrate a hybrid measurement technique using ellipsometry together with other independent methods for validation. Ellipsometry provides information about the porosity of different mesoporous films (PtRuNP/OMC = 45%; IrOx = 46%) as well as about the pore size (pore radius of ca. 5 nm for PtRuNP/OMC). In addition, the electronic structure of a material, such as intraband transitions of a mesoporous IrOx film, can be identified, which can be used to better understand the mechanisms of chemical processes. In addition, we show that ellipsometry can be used as a scalable imaging and visualization method for quality assurance in production. These require accurate and traceable measurements, with reference materials playing an important role that include porosity and other related properties. We show that our novel analytical methods are useful for improving analytical work in this entire field.
Der DIN Ringversuch weist nach, dass die CAT Technologie zur ZPM Prüfung statistisch nicht unterscheidbare Prüfergebnisse liefert, so dass lediglich eine Ergänzung der DIN EN 15870 unter Berücksichtigung der CAT-Technologie (mit Bezug auf äquivalente Kraft und Weg zunahmen) als zweiter normativer Prüfmethode sinnvoll erscheint.
Vorstellung des Revisionsvorschlages im CEN TC 193 am 08.04.2021 mit dem Beschluss, eine Umfrage unter Verwendung des unveränderten deutschen Revisionsvorschlages durchzuführen.
The round robin test proves that the CAT-Technology provides statistically indistinguishable test results compared to TTM. A supplement to DIN EN 15870 taking into account CAT-Technology (with reference to equivalent increases of load and displacement) as second normative test method appears to make sense.
A presentation of a revision proposal at CEN TC 193 has been introduced with the decision to conduct a survey using the unchanged German revision proposal.
Hydrogen production via water electrolysis will be an essential cornerstone in development of sustainable, fossil-free fuel and chemical production on a global scale. The activity and stability of each catalyst is highly dependent on the properties of the coating, i.e., phase composition, crystallinity, accessible surface area, and many other factors. The key to developing improved catalysts is a better understanding of the relationships between their performance, stability, and physicochemical properties. However, these relationships can be complex and are also strongly influenced by the reaction environment. Therefore, operando analysis of the catalyst material during catalysis at realistic potentials and current densities is highly desirable. However, many analytical techniques cannot be applied in liquid environments at realistic potentials and current densities.
We propose environmental ellipsometric analysis in a dedicated electrochemical flow cell as a method to evaluate gas evolution reactions operando under realistic working conditions. Figure 1 illustrates schematically the developed technique. Key factors to success are highly active model-type catalysts, a suitable sample environment, and a deep understanding of the appropriate model development, as well as concise cross validation with numerous other analytical techniques.
The method was developed and validated by analyzing a calcination series (300 – 600 °C) of mesoporous templated IrOx films ex-situ and operando under oxygen evolution reaction (OER) conditions. The employed environmental electrochemical spectroscopic ellipsometric (ECSE) analysis revealed during OER the change of optical and electronic properties, i.e. the dielectric functions, resistivity and band-to-band transitions (p-d band transitions). Film thickness and porosity were validated by means of scanning electron microscopy (SEM), X-ray reflectometry (XRR) or ellipsometric porosimetry (EP), electrical and electronic properties by means of conductivity measurements, X-ray photoelectron spectroscopy (XPS) or UV-Vis-NIR absorption spectroscopy. The electronic structures of the catalysts from valence electron energy loss spectra (VEELS) derived from ε1 and ε2 from SE measurements reveal a direct correlation with electrochemical activities in OER.
In the presentation reversible and irreversible potential-dependent changes of the catalyst properties during operation will be discussed along with the dynamics of gas formation, transport and dissolution at different potentials.