A5079178508- Metallic Glasses and Amorphous Alloys
- Microstructure and mechanical properties
- Glycosylation and Glycoproteins Research
- Material Dynamics and Properties
- nanoparticles nucleation surface interactions
- Phase-change materials and chalcogenides
- Aluminum Alloys Composites Properties
- Glass properties and applications
- Shape Memory Alloy Transformations
- Intermetallics and Advanced Alloy Properties
- Theoretical and Computational Physics
- Metal and Thin Film Mechanics
- High Entropy Alloys Studies
- Advanced Materials Characterization Techniques
- Quasicrystal Structures and Properties
- Aluminum Alloy Microstructure Properties
- Nerve injury and regeneration
- Nanoporous metals and alloys
- Metallurgical and Alloy Processes
- Quantum Dots Synthesis And Properties
- Neuroblastoma Research and Treatments
- Galectins and Cancer Biology
- Microstructure and Mechanical Properties of Steels
- Axon Guidance and Neuronal Signaling
- Caveolin-1 and cellular processes
University of Münster
2016-2025
University of Hohenheim
1999-2016
University of Stuttgart
1975-2009
Karlsruhe Institute of Technology
2003-2009
Western University
2006-2007
Center for NanoScience
2007
FZI Research Center for Information Technology
1999-2006
Ramkhamhaeng University
2006
Institut für Medizinische Biometrie, Informatik und Epidemiologie
2006
Heinrich Heine University Düsseldorf
2006
We report a macroscopic shrinkage by up to 30 vol % during electrochemical dealloying of Ag-Au. Since the original crystal lattice is maintained process, we suggest that formation nanoporous gold in our experiments accompanied creation large number defects and local plastic deformation.
Nanoporous gold, prepared by electrochemical dissolution of Ag from commercial white gold leaf, was investigated HAADF-STEM tomography. The three-dimensional reconstruction shows a fully connected network structure composed single-crystalline ligaments and pores. We have applied stereological analyses to characterize the pore volume fraction, specific surface area, mean curvature. exhibits broad distributions in as well ligament size, convex significant microstructural anisotropy. contain...
Quantitative density measurements from electron scattering show that shear bands in deformed Al88Y7Fe5 metallic glass exhibit alternating high and low regions, ranging -9% to +6% relative the undeformed matrix. Small deflections of band main propagation direction coincide with switches higher lower than matrix vice versa, indicating faster slower motion (stick slip) occurs during propagation. Nanobeam diffraction analyses provide clear evidence changes are accompanied by structural changes,...
In a rat model, nerve regeneration was evaluated across 2-cm defect in the median by using resorbable artificial conduit. The aim of this study to develop an artificial, biocompatible guide induce peripheral nervous system.The authors compared conduit trimethylenecarbonate-co-epsilon-caprolactone (TMC/CL) filled with autologous Schwann cells both empty hollow and graft. Animals that did not undergo surgery served as control group. Nerve grasping test, histological analysis nerve, muscle...
Abstract It is well known that a high pressure ω-phase formed in Ti at pressures the range between 2 and 8 GPa. This martensitic-type transformation demonstrates very large hysteresis, hence can be retained material after release of pressure. Additionally, applied shear stresses are to facilitate α → ω transformation. paper describes an investigation on formation torsion under wide strains by means X-ray diffraction transmission electron microscopy. We show forms upon deformation 300 s 3...
Abstract Bulk nanostructured—or ultrafine‐grained materials are often fabricated by severe plastic deformation to break down the grain size dislocation accumulation. Underlying spectacular property enhancement that forms basis for a wide range of potential applications is modification volume fraction boundaries. Yet, along with enhancements, several important questions arise concerning accommodation external stresses if dislocation‐based processes not longer dominant at small sizes. One...
Abstract Single‐crystal, 1D nanostructures are well known for their high mobility electronic transport properties. Oxide‐nanowire field‐effect transistors (FETs) offer both optical transparency and large mechanical conformability which essential flexible transparent display applications. Whereas the “on‐currents” achieved with nanowire channel already sufficient to drive active matrix organic light emitting diode (AMOLED) displays; it is shown here that incorporation of...
Plastic deformation of metallic glasses performed well below the glass transition temperature leads to formation shear bands as a result localization. It is believed that banding originates from individual stress concentrators having quadrupolar symmetry. To elucidate underlying mechanisms band formation, microstructural investigations were carried out on sheared zones using transmission electron microscopy. Here we show evidence characteristic signature present in manifested form sinusoidal...
Two distinct enthalpic states were induced in a Pd40Ni40P20 bulk metallic glass through cyclic annealing at 473 K (0.81Tg) and 558 (0.96Tg), targeting individual β or α relaxation modes, here referred to as the so-called shadow transition (SGT) enthalpy recovery, respectively. Fluctuation electron microscopy (FEM) was employed systematically investigate medium-range order (MRO) within amorphous structure post-annealed state subsequent quenching after SGT. Comparing results with literature...
A method for the reliable fabrication of less than 200 nm thick, free-standing purified-SWNT films having large surface areas exceeding several cm2 is described. Films were characterized using a variety optical, microscopic and spectroscopic methods. The procedure was also used to prepare thin as-prepared, acid-cut octadecylamine (ODA) functionalized SWNTs. Such samples allow facile transmission measurements SWNT derived solids.
Nanowires are created by nucleation of nanometer-scaled noble metal particles on microtubules formed from highly ordered protein assemblies. The periodic functional groups amino acids serve as active sites for and binding the metallic nanoparticles to form patterns particles, which, further particle growth, generate quasi-continuous coatings (see Figure).
Defect structures of plastically deformed nanocrystalline Pd investigated by high-resolution transmission electron microscopy are presented. Material with an average grain size about 15 nm was prepared inert-gas condensation, and this cold rolling up to a true strain 0.32 at rate 0.3 s−1. Abundant deformation twinning on {111} planes found Shockley partial dislocations identified. Remarkably, in each grain, occurs only single set parallel planes. This implies that one out the five...