Filtern
Erscheinungsjahr
Dokumenttyp
- Zeitschriftenartikel (25)
- Beitrag zu einem Tagungsband (14)
- Beitrag zu einem Sammelband (2)
- Corrigendum (1)
- Posterpräsentation (1)
Schlagworte
- Ringversuch (7)
- Gefahrgut (5)
- Gefahrstoff (5)
- Prüfmethode (5)
- Qualitätssicherung (5)
- Interface (4)
- Validierung (4)
- Adhäsion (3)
- Dangerous goods (3)
- Haftung (3)
- Hazardous substances (3)
- Quality assurance (3)
- Reibung (3)
- Spurenverunreinigungen (3)
- Test method (3)
- Validation (3)
- Verbundwerkstoffe (3)
- Cell proliferation (2)
- Exocytosis (2)
- Femtosecond laser ablation (2)
- Gold nanoparticles (2)
- Incorrect classification (2)
- Interlaboratory test (2)
- Measurement uncertainty (2)
- NEXAFS (2)
- NO2 (2)
- Quantum dots (2)
- Thermoplast (2)
- Uptake studies (2)
- Verstärkungsfaser (2)
- 1,3,4-Oxadiazole (1)
- Adhesion (1)
- Azodicarbonamid (1)
- CCS (1)
- CO2-storage (1)
- Calcium cobaltite (1)
- Carbon (1)
- Carbon capture and storage (1)
- Carbon fibers (1)
- Carbon fibres (1)
- Carbon nanotube CNT (1)
- Coating (1)
- Coherent scattering (1)
- Contact angle (1)
- Coordination polymers (1)
- Corrosion (1)
- Crystal structure (1)
- DLS (1)
- Deflagrationen (1)
- Deflagrationsgeschwindigkeit (1)
- Discotic liquid crystals (1)
- Druckanstiegsrate (1)
- Electron microscopy (1)
- FT-IR-Spektroskopie (1)
- Fiber properties (1)
- Fibre - matrix bond (1)
- Fluorescence (1)
- Fluorescence labeling (1)
- Fluorination (1)
- Fluorination kinetics (1)
- Free electron lasers (1)
- Functionalized Au nanoparticles (1)
- Gas phase fluorination of PE (1)
- Gaschromatographie (1)
- Geschlossenes System (1)
- Heat treatment (1)
- Hydrogen bonds (1)
- IR (1)
- Interfacial strength (1)
- Interlaboratory comparison (1)
- LTCC (1)
- Laser-induced periodic surface structures (1)
- Layer-by-layer deposition (1)
- Liquid crystal (1)
- Messmethode (1)
- Metal matrix (1)
- Metallo-supramolecular chemistry (1)
- Methan (1)
- Methodenvalidierung (1)
- Meßverfahren (1)
- Molecular conformation (1)
- Molecular dynamics simulation (1)
- Molecular-dynamics (1)
- Multilayer (1)
- Nano-materials (1)
- New and emerging technologies and materials (1)
- OMBD (1)
- Oxygen-containing functionalities (1)
- Passive components and circuits (1)
- Phase shifter (1)
- Photoelectron spectroscopy (XPS) (1)
- Pipeline (1)
- Polymer matrix (1)
- Pressure-assisted sintering (1)
- Pull-out (1)
- Pull-out test (1)
- Purification (1)
- Raman imaging (1)
- Raman spectroscopy (1)
- Reinforced composites (1)
- Round robin test (1)
- SEM (1)
- Scherfestigkeit (1)
- Schubfestigkeit (1)
- Self-assembly (1)
- Semiconductor (1)
- Shark profile (1)
- Shark profiles (1)
- Shear strength (1)
- Silicon (1)
- Simulation (1)
- Steel (1)
- Structural characterization (1)
- Surface area (1)
- Surface functional groups (1)
- TEM (1)
- Tensile test inside a TEM (1)
- Thermoelectric oxide (1)
- Thermoplaste (1)
- Time-resolved coherent XUV scattering (1)
- ToF-SIMS (1)
- Tunable antenna (1)
- UV-vis (1)
- Verifizierung (1)
- Vesicles (1)
- Weathering (1)
- X-ray Absorption Spectroscopy (1)
- XPS (1)
Organisationseinheit der BAM
- 2 Prozess- und Anlagensicherheit (6)
- 2.0 Abteilungsleitung und andere (6)
- 1 Analytische Chemie; Referenzmaterialien (2)
- 1.2 Biophotonik (2)
- 2.1 Sicherheit von Energieträgern (1)
- 2.2 Prozesssimulation (1)
- 5 Werkstofftechnik (1)
- 5.4 Multimateriale Fertigungsprozesse (1)
- 6 Materialchemie (1)
- 6.6 Physik und chemische Analytik der Polymere (1)
To study the mechanical interface behavior of single-walled carbon nanotubes (CNTs) embedded in a noble metal, we performed CNT-metal pull-out tests with in situ scanning electron microscope experiments. Molecular dynamics (MD) simulations were conducted to predict force-displacement data during pull-out, providing critical forces for failure of the system. In MD simulations, we focused on the influence of carboxylic surface functional groups (SFGs) covalently linked to the CNT. Experimentally obtained maximum forces between 10 and 102 nN in palladium and gold matrices and simulated achievable pulling forces agree very well. The dominant failure mode in the experiment is CNT rupture, although several pull-out failures were also observed. We explain the huge scatter of experimental values with varying embedding length and SFG surface density. From simulation, we found that SFGs act as small anchors in the metal matrix and significantly enhance the maximum forces. This interface reinforcement can lead to tensile stresses sufficiently high to initiate CNT rupture. To qualify the existence of carboxylic SFGs on our CNT material, we performed analytical investigation by means of fluorescence labeling of surface species and discuss the results. With this contribution, we focus on a synergy between computational and experimental approaches involving MD simulations, nano scale testing, and analytics (1) to predict to a good degree of accuracy maximum pull-out forces of single-walled CNTs embedded in a noble metal matrix and (2) to provide valuable input to understand the underlying mechanisms of failure with focus on SFGs. This is of fundamental interest for the design of future mechanical sensors incorporating piezoresistive single-walled CNTs as the sensing element.
A simple method of creating defined PMMA and poly (MMA-co-Cz) electrocoatings on carbon fibres is described. The electrodeposition of poly methylmethacrylate (PMMA) onto unsized, unmodified carbon fibres was performed by simple constant current electrolyses of methylmethacrylate (MMA) monomer in dimethylformamide (DMF) solutions and the pure liquid monomer using sodium nitrate and lithium perchlorate as supporting electrolytes. The presence of polymeric coatings successfully attached to the carbon fibres was verified by scanning electron microscopy and photoelectron spectroscopy (XPS).
Performing the electrolysis in dilute MMA in DMF solutions ([MMA] < 5 M) results in the deposition of powder-like polymer on the carbon fibre electrodes. Increasing the MMA concentration in the DMF solution results in a homogeneous PMMA coating of the carbon fibres. The degree of grafting or coating increases with increasing MMA concentration, except when pure MMA is used without solvent.
The adhesive strength between the electrocoated carbon fibres and a PMMA matrix was determined using the single fibre pull-out test. It was found that the interfacial fracture behaviour of all carbon fibre/PMMA model composites is rather brittle. The adhesion strength between the unmodified carbon fibres and the PMMA matrix was equal to the cohesive strength of the polymer matrix itself. Nevertheless, the electrodeposition of thin and homogeneous PMMA coatings resulted in much improved adhesion strengths.