A5101537722- Linguistic Education and Pedagogy
- Linguistic research and analysis
- Advanced Cellulose Research Studies
- Nuclear Physics and Applications
- Advanced X-ray Imaging Techniques
- Advanced Electron Microscopy Techniques and Applications
- Wood Treatment and Properties
- Second Language Learning and Teaching
- Pragmatism in Philosophy and Education
- X-ray Diffraction in Crystallography
- High-pressure geophysics and materials
- Metal and Thin Film Mechanics
- Titanium Alloys Microstructure and Properties
- Natural Fiber Reinforced Composites
- Intermetallics and Advanced Alloy Properties
- Bone Tissue Engineering Materials
- Calcium Carbonate Crystallization and Inhibition
- Solid-state spectroscopy and crystallography
- nanoparticles nucleation surface interactions
- Cultural Heritage Materials Analysis
- Ion-surface interactions and analysis
- Advanced ceramic materials synthesis
- Lignin and Wood Chemistry
- Critical Theory and Philosophy
- Catalytic Processes in Materials Science
Kiel University
2009-2025
Helmholtz-Zentrum Hereon
2015-2024
Heinz Maier-Leibnitz Zentrum
2021-2024
Fachhochschule Kiel
2003-2024
Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)
2022
München Klinik
2021
Philips (United Kingdom)
2013-2019
Krankenhaus Lindenbrunn
2016
Max Planck Society
2014
Art Research Centre of the Slovak Academy of Sciences
2010
Plant fibers such as linen are remarkably stiff materials in the longitudinal direction of fiber. As plant cell walls composites made cellulose nanocrystals, so-called microfibrils, embedded a disordered matrix, those nanocrystals should exhibit an even higher elastic modulus G. We have determined properties microfibrils via sound velocities measured by inelastic X-ray scattering (IXS). The IXS technique is particularly sensitive to crystal discriminating contribution material. A strong...
The Imaging Beamline (IBL) P05 is operated by the Helmholtz-Zentrum Geesthacht and located at DESY storage ring PETRA III. IBL dedicated to X-ray full field imaging consists of two experimental end stations. A micro tomography station equipped for spatial resolutions down 1 µm a nano 100 nm. in user operation since 2013 offers with absorption contrast, phase enhanced contrast methods. We report here on current status developments including technical descriptions show examples research performed P05.
Abstract Designing an efficient, durable, and inexpensive bifunctional electrocatalyst toward oxygen evolution reactions (OER) reduction (ORR) remains a significant challenge for the development of rechargeable zinc‐air batteries (ZABs). The generation vacancies plays vital role in modifying surface properties transition‐metal‐oxides (TMOs) thus optimizing their electrocatalytic performances. Herein, H 2 /Ar plasma is employed to generate abundant at surfaces NiCo O 4 nanowires. Compared...
Detergent extracts of microsomal fractions from suspension cultured cells Rubus fruticosus (blackberry) were tested for their ability to synthesize in vitro sizable quantities cellulose UDP-glucose. Both Brij 58 and taurocholate effective yielded a substantial percentage microfibrils together with (1-->3)-beta-d-glucan (callose). The extracts, which did not require the addition Mg(2+), most efficient, yielding roughly 20% cellulose. This was characterized after callose removal by methylation...
Zirconia microparticles produced by sol–gel synthesis have great potential for photonic applications. To this end, identifying synthetic methods that yield reproducible control over size uniformity is important. Phase transformations during thermal cycling can disintegrate the particles. Therefore, understanding parameters driving these essential enabling high-temperature Particle morphology expected to influence particle processability and stability. Yttria-doping should improve stability...
Abstract Load-displacement curves measured during indentation experiments on thin films depend non-homogeneous intrinsic film microstructure and residual stress gradients as well their changes indenter penetration into the material. To date, microstructural local concentrations resulting in plastic deformation fracture were quantified exclusively using numerical models which suffer from poor knowledge of size dependent material properties unknown gradients. Here, we report first in-situ...
The imaging beamline (IBL/P05) operated by Helmholtz Zentrum Geesthacht (HZG) at the DESY PETRA III storage ring consists of two experimental stations: A micro tomography and a nano end station. Here an overview setups data acquisition will be given. In addition some first results out wide range applications using station P05 shown. Furthermore, we present These were obtained with x–ray microscopy setup, which currently operates energies 17.4 30 keV polymer compound refractive lenses (CRLs)...
Abstract Single tension-wood fibres from poplar were investigated using a synchrotron radiation X-ray microbeam. The resulting diffraction patterns are highly resolved (smallest d -spacing 0.11 nm). In the gelatinous layer, cellulose microfibrils of high perfection found in almost ideal parallel alignment. Their cross-section is approximately four-fold greater than that S2 layer same wood cell. results discussed terms influence encrusting cell wall polymers and biosynthesis on structure...
Abstract Parallel and concentric alignment of microscopic building blocks into several orders magnitude larger structures is commonly observed in nature. However, if similarly aligned are artificially produced their thickness generally limited to just about one or two more than the dimensions smallest element. We show that sedimentation provides a promising approach manufacture solid materials consisting well-aligned platelet-shaped particles while being 30 000 times thicker individual...
Hard X-ray nanotomography enables 3D investigations of a wide range samples with high resolution (<100 nm) both synchrotron-based and laboratory-based setups. However, the advantage setups is flux, enabling time resolution, which cannot be achieved at laboratory sources. Here, setup imaging beamline P05 PETRA III presented, offers not only in absorption but for first also Zernike phase contrast. Two test are used to evaluate image quality contrast modalities based on quantitative analysis...
High-resolution X-ray nanotomography is a quantitative tool for investigating specimens from wide range of research areas. However, the quality reconstructed tomogram often obscured by noise and therefore not suitable automatic segmentation. Filtering methods are required detailed analysis. most filters induce blurring in tomograms. Here, machine learning (ML) techniques offer powerful alternative to conventional filtering methods. In this article, we verify that self-supervised denoising ML...
The collective dynamics of methane and xenon hydrate in the energy range $\ifmmode\pm\else\textpm\fi{}20\mathrm{meV}$ Q $1.5--11{\mathrm{nm}}^{\ensuremath{-}1}$ has been investigated by inelastic x-ray scattering compared to results from neutron experiments lattice dynamical calculations. experiment focused on low--frequency phonon dispersion curves that were found point towards existence an avoided crossing between acoustic phonons localized guest modes. calculations reproduce experimental...
Due to the present shortage of 3He and associated tremendous increase its price, supply large neutron detection systems with becomes unaffordable. Alternative concepts, therefore, have been invented based on solid 10B converters. These concepts require development in thin film deposition technique regarding high adhesion, thickness uniformity chemical purity converter coating area substrates. We report sputter highly uniform large-area 10B4C coatings up 2 μm a deviation below 4% using...
The ambitious instrument suite for the future European Spallation Source whose civil construction started recently in Lund, Sweden, demands a set of diverse and challenging requirements neutron detectors. For instance, unprecedented high flux expected on samples to be investigated diffraction or reflectometry experiments requires detectors that can handle counting rates, while investigation sub-millimeter protein crystals will only possible with large-area achieve position resolution as low...
A novel routine is developed to produce nanostructured ceramic-based composites with enhanced mechanical properties and tailored magnetic behavior.
Supercrystalline nanocomposite materials with micromechanical properties approaching those of nacre or similar structural biomaterials can be produced by self-assembly organically modified nanoparticles and further strengthened cross-linking. The strengthening these nanocomposites is controlled via thermal treatment, which promotes the formation covalent bonds between interdigitated ligands on nanoparticle surface. In this work, it shown how extent mechanical enhancement solvent used during...
Supercrystalline nanocomposites deform plastically like atomic crystals, even after a boost in strength, and feature compaction.
Highly oriented native cellulose fibres (flax) and softwood (pine) have been investigated by means of X-ray diffraction. Local structural information was obtained using microbeams. Tensile tests were performed in situ, revealing a change orientation microfibrils materials with tensile strain. In flax fibres, the rotate during first percent stretching, into more parallel respect to fibre axis. For wood, decrease onset strain hardening is found for time.