A5045402908- Physics of Superconductivity and Magnetism
- Magnetic and transport properties of perovskites and related materials
- Advanced Condensed Matter Physics
- Superconductivity in MgB2 and Alloys
- ZnO doping and properties
- Magnetic properties of thin films
- Iron-based superconductors research
- Electronic and Structural Properties of Oxides
- Magnetic Properties and Applications
- Superconducting Materials and Applications
- Copper Interconnects and Reliability
- Thermal and Kinetic Analysis
- High-pressure geophysics and materials
- Microwave Dielectric Ceramics Synthesis
- Ferroelectric and Piezoelectric Materials
- Catalytic Processes in Materials Science
- Magnesium Alloys: Properties and Applications
- Semiconductor materials and devices
- Surface and Thin Film Phenomena
- Radioactive element chemistry and processing
- Microstructure and mechanical properties
- Quantum and electron transport phenomena
- Acoustic Wave Resonator Technologies
- Rare-earth and actinide compounds
- Catalysis and Oxidation Reactions
Technical University of Denmark
2016-2025
University of Copenhagen
2007-2014
Institute of Semiconductor Physics
2012
Nordic Laboratory for Luminescence Dating
1999-2011
Centre for Sustainable Energy
2003-2010
Roskilde University
2007
University of Geneva
1993-1999
KTH Royal Institute of Technology
1999
HES-SO Genève
1996
Geneva College
1993
Abstract Enzyme immobilization is an established method for the enhancement of enzyme stability and reusability, two factors that are great importance industrial biocatalytic applications. Immobilization can be achieved by different methods on a variety carrier materials, both organic inorganic. Inorganic materials provide advantage high long service life which, together with prolonged immobilized enzyme, benefit process economy. However, increased often come at cost decreased activity. The...
Abstract Doping is a crucial strategy to enhance the performance of various organic electronic devices. However, in many cases, random distribution dopants conjugated polymers leads disruption polymer microstructure, severely constraining achievable Here, it shown that by ion‐exchange doping polythiophene‐based P[(3HT) 1‐x ‐stat‐(T) x ] ( = 0 (P1), 0.12 (P2), 0.24 (P3), and 0.36 (P4)), remarkably high electrical conductivity >400 S cm −1 power factor >16 µW m K −2 are achieved for...
Zinc containing mixed metal oxides and supported zinc oxide are stable selective methanol synthesis catalysts at temperatures where a subsequent to hydrocarbons reaction can occur directly. This work provides fundamental insights into ZnO-based high temperature catalysts. A pronounced support effect was observed, ZrO2 provided beneficial while SiO2 exerted detrimental compared bulk ZnO. Preparing co-precipitated ZnO-ZrO2 showed that the initial activity correlated with amount of amorphous...
The electronic structure of binary titanate La2Ti2O7 has been studied by x-ray photoelectron spectroscopy. Spectral features valence band and all constituent element core levels have considered. Auger parameters titanium oxygen in are determined as αTi = 872.4 αO 1042.3 eV. Chemical bonding effects discussed with binding energy (BE) differences ΔTi (BE O 1s − BE Ti 2p3/2) 71.6 eV ΔLa La 3d5/2 1s) 304.7 eV key comparison those several titanium- lanthanum-bearing oxides.
In this study, micro- and nano-spectroscopic techniques were used to examine the aerial epidermis of barley crop leaf cuticle determine if there is a correlation between morphological features their chemistry. We believe understanding could provide insights into engineering nanoparticles (NP) with improved controlled NP–plant interaction potential application as foliar nanofertilizers. compared three different Raman excitation wavelengths – NIR, Vis, UV evaluated possibilities like...
The various fabrication and reaction processes leading to multifilamentary Bi,Pb(2223) tapes with high transport are described. In air, the phase in pressed powders is found be formed by nucleation, following complete decomposition of Bi,Pb(2212) intermediate phase. this work, precise formation conditions Pb-free Bi(2223) described for first time. It shown that presence Pb leads a lowering melting temperature from 879 `transient liquid' . latter after 2-layer compound necessary 3-layer...
The morphological transformations occurring in the precursor powders during formation of phase were investigated by scanning electron microscopy performed on same location surface a pellet, which underwent several heat treatments at for various times. Following evolution given group grains we have found that crystals occurs simultaneously with gradual decomposition intermediate phase. This result was confirmed microprobe analysis as well x-ray diffraction samples. As main result, conclude...
An experimental study of the effect MgO content in MgB2 powder used for ex situ made composite wires was carried out. Two single-core MgB2/Fe/Cu were using commercial powders from Alfa Aesar containing different fraction MgO. Critical temperature and critical currents as-deformed heat-treated measured. The differences between are discussed correlated with content. It found that by increasing amount MgO, inter-grain connectivity worsens, but well distributed low size particles improve flux pinning.
A new route has been found for producing the Bi2Sr2CaCu2Oy, phase with Pb substituted part of Bi (denoted Bi,Pb(2212)). By this novel route, Bi,Pb(2212) prepared in air at 860 degrees C. For comparison, also argon 740 C by previously known route. transforms from a tetragonal to an orthorhombic structure as content grows. Once was obtained nominal composition Bi2-xPbxSr2CaCu2Oy, contents x=0, 0.2, 0.4 and 0.6, Bi(2223) formed starting Bi(2212) Bi,Pb(2212). Single-phase samples were after two...
The reaction of the precursor powders necessary for formation final Bi(2223) phase was investigated with and without presence an Ag sheath by means differential thermogravimetry (DTA/DTG). nature endothermic peaks observed DTA as well influence on their positions are discussed. By X-ray diffraction energy dispersive analysis (EDX) oil-quenched Ag-sheathed tapes it is shown that Bi(2212) originally present in undergoes a structural modification which can be associated dissolution Pb. This...
Intensive investigations have been conducted to develop epitaxial oxide thin films with superior electromagnetic performance by low-cost chemical solution deposition routes. In this paper, a novel propionate-based precursor without involving any other additive was proposed and employed grow superconducting YBa2Cu3O7−δ (YBCO) on LaAlO3 (LAO) single crystals. The solutions are stable long shelf life of up several months. Since the primary compositions propionates after evaporating solvent,...
In previously reported low-fluorine MOD-YBCO studies, the lowest F/Ba mole ratio of precursor solution was 4.5. Further lowering would bring benefits for environment, thick film deposition, and an understanding heat treatment process. On other hand, must be at least 2 full conversion Ba-precursor to BaF2 avoid formation BaCO3, which is detrimental superconducting performance YBCO films. this study, a with 2:1 developed, fluorine content approximately only 10.3% that used in conventional...
Preparation and characterization of a biaxially textured Gd2Zr2O7 Ce0.9La0.1O2 − y (CLO, cap)/Gd2Zr2O7 (GZO, barrier) buffer layer stack by the metal–organic deposition route are reported. YBa2Cu3O7 d (YBCO) superconductor films were deposited pulsed-laser (PLD) technique to assess efficiency such novel stack. Biaxial texture quality morphology layers YBCO fully characterized. The surface crystallinity is studied electron backscatter diffraction technique. It revealed that post-annealing GZO...