A5012391991- GaN-based semiconductor devices and materials
- Glass properties and applications
- X-ray Spectroscopy and Fluorescence Analysis
- Semiconductor materials and devices
- Cultural Heritage Materials Analysis
- Semiconductor materials and interfaces
- Recycling and utilization of industrial and municipal waste in materials production
- Adsorption and biosorption for pollutant removal
- Metal and Thin Film Mechanics
- Iron oxide chemistry and applications
- Environmental remediation with nanomaterials
- ZnO doping and properties
- Chromium effects and bioremediation
- Arsenic contamination and mitigation
- Luminescence Properties of Advanced Materials
- Copper Interconnects and Reliability
- Electron and X-Ray Spectroscopy Techniques
- Copper-based nanomaterials and applications
- Characterization and Applications of Magnetic Nanoparticles
- Ion-surface interactions and analysis
- Geological and Geochemical Analysis
- Ga2O3 and related materials
- Gas Sensing Nanomaterials and Sensors
- Nuclear materials and radiation effects
- Bone Tissue Engineering Materials
Aristotle University of Thessaloniki
2014-2024
University of Crete
2008
The development of a single-phase Fe/Mn oxy-hydroxide (δ-Fe0.76Mn0.24OOH), highly efficient at adsorbing both As(III) and As(V), is reported. Its synthesis involves the coprecipitation FeSO4 KMnO4 in kilogram-scale continuous process, acidic strongly oxidizing environments. produced material was identified as manganese feroxyhyte which tetravalent homogeneously distributed into crystal unit, whereas second-order hollow spherical morphology favored. According to this structuration, maintains...
The glass matrix of composition: 55SiO2–10B2O3–25Na2O-5BaO-5ZrO2 was incorporated with 10 to 40 wt% UO3 by melt quenching technique. Neutron diffraction and Reverse Monte Carlo simulations revealed that the borosilicate network consists SiO4, BO3 BO4 units; upon adding % B-O coordination increases from 3.08 3.86 subsequently decreases a further in increase content. X-ray absorption near edge Extended studies U exist 5+ 6+ oxidation states U-O numbers 8 6 respectively. thermal stability...
We apply near-edge x-ray absorption fine structure spectroscopy, at the N K edge, in order to identify signature of implantation-induced defects partial density empty states GaN implanted with O, Mg, and Si ions. The dose range was 1014–1018 cm−2. It is found that two introduce characteristic resonances (hereafter called RL1 RL2) spectra. appears 1.7 eV below its formation independent projectile implantation dose, attributed nitrogen interstitials. RL2, which about 1.0 above generated when...
Borosilicate glasses will be used to stabilize the high-level radioactive wastes for disposal in a geological repository. Understanding effects of actinide addition borosilicate glass matrix is great importance view waste immobilization. Lanthanides were considered as chemical surrogates actinides. The local structures Ce3+, Nd3+ and Eu3+ ions glass, have been investigated by synchrotron radiation based techniques. atomic parameters, such bond lengths coordination environments derived from...
Iron oxide magnetic nanoparticles (MNPs) are promising candidates in particle hyperthermia (MPH) applications. However, MPH often initiates the oxidation process of magnetite to maghemite, thus modifying properties and heating efficiency MNPs. Here, we report on degree iron-oxide MNPs parallel their spatial distribution order understand behavior extent aggregation upon application. The micrometric an agarose gel matrix was addressed using two-dimensional μ-X-ray fluorescence (XRF) elemental...
Cu3N layers with a thickness of 40 nm were deposited by reactive sputtering using Ar: 10% N2 and 100% N2, after which they annealed under NH3/H2 between 300 500 °C. These exhibited distinct maxima in differential transmission at ∼2.46, 2.30, 2.05, 1.9 eV on picosecond time scale, as shown ultrafast pump-probe spectroscopy. We show that the 2.05 correspond to M R direct energy band gaps bulk Cu3N. In contrast, higher 2.46 2.30 are related occurrence strained vicinity surface due oxidation...
Earlymost Villafranchian fossil bones of an artiodactyl and a perissodactyl from the Milia excavation site in Grevena, Greece, were studied order to evaluate diagenetic effects. Optical microscopy revealed different bone types (fibro-lamellar Haversian, respectively) two fragments their good preservation state. The spatial distribution apatite soil-originating elements was using micro-X-ray fluorescence (µ-XRF) mapping scanning electron microscopy. approximate value Ca/P ratio 2.2, as...
Abstract In the present study, ability of a modified CaCl 2 zeolite (Ca-Z) to both increase Se(IV) availability and restrict Se(VI) mobility in soils is examined. As it was resulted from batch experiments verified by X-ray absorption fine structure (XAFS) fluorescence (XRF) spectroscopies, higher amounts Se species adsorbed on Ca-Z compared natural (Z-N) forming outer-sphere complexes while oxidation state did not alter during agitation samples. Thereafter, incorporated six Greek soils,...