A5051434344- Bone Tissue Engineering Materials
- Calcium Carbonate Crystallization and Inhibition
- Inorganic Chemistry and Materials
- Rare-earth and actinide compounds
- Iron-based superconductors research
- Conducting polymers and applications
- Quantum Dots Synthesis And Properties
- Mesoporous Materials and Catalysis
- Gold and Silver Nanoparticles Synthesis and Applications
- Crystal Structures and Properties
- Copper-based nanomaterials and applications
- Advanced Electron Microscopy Techniques and Applications
- X-ray Diffraction in Crystallography
- Collagen: Extraction and Characterization
- Catalytic Processes in Materials Science
- Chalcogenide Semiconductor Thin Films
- Orthodontics and Dentofacial Orthopedics
- Polymer Surface Interaction Studies
- Transition Metal Oxide Nanomaterials
- Force Microscopy Techniques and Applications
- ZnO doping and properties
- Advanced Thermoelectric Materials and Devices
- Molecular Junctions and Nanostructures
- 2D Materials and Applications
- Gas Sensing Nanomaterials and Sensors
Max Planck Institute for Chemical Physics of Solids
2013-2025
Max Planck Society
2015-2024
Helmholtz Institute Jena
2022-2023
Friedrich Schiller University Jena
2022-2023
Johannes Gutenberg University Mainz
1991-2019
Technion – Israel Institute of Technology
2019
Seoul National University
2019
TU Dresden
1992-2012
Leibniz Institute of Polymer Research
2008
St Petersburg University
2008
A convenient route at ambient conditions was employed to prepare narrow-dispersed ZnO nanorods in terms of size and morphology. Transmission electron microscopy X-ray diffraction were used characterize the structurally uniform well-proportioned products. The as-prepared specimen exhibits strong ultraviolet exciton emission 385 nm disappearance visible defect emission.
We present a facile and reproducible method for synthesizing monodisperse platinum (Pt) spheres with sizes ranging from 10 to 100 nm in diameter exceptionally small standard deviations of 3% large spheres. The reaction takes place aqueous solution using multistep seed-mediated approach. Pt nanospheres consist several crystallites resulting surface roughness 5-10 nm. Extinction spectra are measured particles dispersed water calculated single which found be excellent agreement. obtain linear...
Reverse microemulsions, consisting of heptane, nonionic surfactants, and aqueous salt solutions, were used to synthesize BiOX (X = Cl, Br, I) nanoparticles. The reverse micelles act as nanoscale templates for the ionic precipitation process. size can be tailor particles. BiOCl nanoparticles synthesized in a range 3−22 nm (diameter); BiOBr BiOI, was 5.5−22 4−18 nm, respectively. microemulsions characterized by dynamic light scattering. X-ray diffraction patterns particles isolated from...
Look, no hands! Non-supported macroscopic aerogels are fabricated from platinum, gold, and silver, bimetallic mixtures of gold/silver platinum/silver. The hydrogels consist voluminous porous networks particles or wires that only a few nanometers thick. These entirely new structures have tremendous potential for applications in catalysis nanophotonics.
Abstract The mesocrystal system fluoroapatite—gelatine grown by double-diffusion is characterized hierarchical composite structure on a mesoscale. In the present work we apply solid state NMR to characterize its molecular level and provide link between structural organisation mesoscale atomistic computer simulations. Thus, find that individual nanocrystals are composed of crystalline fluorapatite domains covered thin boundary apatite-like layer. latter in contact with an amorphous layer,...
Solvent-induced aggregation of regioregular head-to-tail poly(3-alkylthiophene)s (PATs) have been studied by means AFM and UV−vis spectroscopy. In hexane, which is a good solvent for alkyl side chains but poor polythiophene backbones, PAT molecules undergo ordered main-chain collapse driven solvophobic interaction. Well-pronounced concentration-independent red shift λmax resolved fine vibronic structure in the electronic absorption spectra observed upon addition hexane indicate that...
A new form of P: The crystal structure a fibrous type red phosphorus was solved using single-crystal X-ray diffraction methods and transmission electron microscopy. It consists double tubes (see picture) is closely related to the Hittorf's phosphorus. Density functional calculations confirm experimental results.
We present a systematic study on p-type doping of zinc-phthalocyanine by tetrafluoro-tetracyano-quinodimethane as an example controlled thin organic films cosublimation matrix and dopant. The layers are prepared both in polycrystalline amorphous phase variation the sublimation conditions. electrically characterized situ temperature dependent conductivity Seebeck field-effect measurements. In addition to previous work, we show that also phthalocyanine can be doped, i.e., their increases...
The electrospinning technique was used successfully to fabricate one-dimensional arrays of Au nanoparticles within nanofibers in which the intrinsic nature semicrystalline polymer poly(ethylene oxide) (PEO) employed as a template for controlled nanoscale organization nanoparticles. Differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy, UV−visible electron microscopy, atomic force and transmission microscopy (TEM) were performed characterize resulting electrospun...
Transparent luminescent nanocomposites were obtained using the bulk polymerization of transparent dispersions containing manganese-doped ZnS nanoparticles with a crystallite size 2 nm in mixture methyl methacrylate and acrylic acid. The effective diameter monomer is 22 as determined dynamic light scattering depends on composition continuous phase but significantly higher than primary ZnS:Mn initially from precipitation reaction. are stable up to 8 months. Deprotonated carboxylate groups...
Based on the biomimetic approaches present work describes a straightforward technique to mimic not only architecture (the morphology) but also chemistry composition) of lowest level hierarchical organization bone. This uses an electrospinning (ES) process with polyvinyl alcohol (PVA) and hydroxyapatite (HAp) nanoparticles. To determine morphology, crystalline structures thermal properties resulting electrospun fibers pure PVA PVA/HAp nanocomposite (NC) before various techniques were...
Form follows the ion: The morphogenesis of fluorapatite–gelatine nanocomposites is studied from both electron microscopy and atomistic simulation revealing ion impregnation effects on growth mechanisms. Depending ionic species used for pre-treatment organic component dramatic changes mesoscopic structuring are observed.
Impressive progress has been made in the processing and exploration of new material on an atomic scale (nanomaterials). However, characterization such materials by usual transmission electron microscopy (TEM) techniques suffers from drawback that phase object-modulated wave is virtually lost recorded intensity images. Electron holography opened possibilities for analyzing both amplitude wave, hence giving access to object information encoded phase. Examples include intrinsic electric...
Living templates: Gold, silver, platinum, and palladium nanoparticles are synthesized. The as-obtained citrate-stabilized solutions used as growth media for a variety of fungi. partly assemble onto the mycelia, leading to hybrid structure which consists biological template covered with nanoparticles. Supercritical drying these structures conserves three-dimensional tubular shape. Supporting information this article is available on WWW under...
Tibia trabeculae and vertebrae of rats as well human femur were investigated by high-resolution TEM at the atomic scale in order to reveal snapshots morphogenetic processes local bone ultrastructure formation. By taking into account reflections hydroxyapatite for Fourier filtering appearance individual alpha-chains within triple-helix clearly shows that bears feature an intergrowth composite structure extending from nanoscale, thus representing a molecular collagen apatite. Careful analysis...
Raman spectra of sodium niobate (NaNbO3) were obtained in all phases and revealed a significant disorder the high-temperature U, T2 T1 ac omplicated folding Brillouin zone at transitions into modulated S, R, P N associated with competitive zone-boundary soft mode s( in-phase out-of phase octahedral tilts) along M–T–R line. An extensive study combined x-ray diffraction (XRD) dielectric measurements confirmed presence incommensurate (INC) niobate. XRD experiments invar effect temperature...
The seeder of the pack: electrical potential distribution (see phase image an electron hologram) around basal plane close to prism faces a hexagonal fluorapatite–gelatine nanocomposite seed influences growth nanocomposite. consists elementary dipoles on nanometer scale, which all have same orientation along c axis composite seed. Further form development leads fractal patterns.
Sub-micrometer-sized hollow tantalum oxide (Ta2O5) spheres with tunable shell thickness and void size have been fabricated exploiting beta-diketone-functionalized polystyrene (PS) beads as sacrificial templates in a sol-gel process. First, controlled precipitation of Ta2O5 nanoparticles was carried out on the template surface by hydrolyzing ethoxide (Ta(OEt)5) at room temperature, subsequently, polymer core removed either via chemical treatment toluene or calcination 650 degrees C. The...
We report the synthesis and characterization of transparent nanocomposites consisting YVO4 : Eu nanoparticles in polymer matrices. The composite materials are made by situ polymerization particle dispersions methyl methacrylate (MMA) lauryl acrylate (LA). Two different pathways for preparation these their presented. first method, based on reverse microemulsions, yields a dispersion MMA. microemulsion droplets function as space-confined containers precipitation reaction hydrodynamic diameter...