A5008749355- Graphene research and applications
- Topological Materials and Phenomena
- 2D Materials and Applications
- Luminescence Properties of Advanced Materials
- Glass properties and applications
- Magnetic Properties and Synthesis of Ferrites
- ZnO doping and properties
- Crystal Structures and Properties
- Ultrasound and Cavitation Phenomena
- Multiferroics and related materials
- Phase-change materials and chalcogenides
- Copper-based nanomaterials and applications
- Magnetic properties of thin films
Al-Azhar University
2010-2025
Al-Azhar University
2021
The periodic herringbone reconstruction on the surface of Au(111) consists alternating face-centered-cubic (fcc) and hexagonal-closed-packed (hcp) sites separated by dislocation lines elbows. This well-known arrangement acts as an electronic superlattice for surface-state electrons, creating a mini-gapped band structure with modulated density. rich fascinating geometrical landscape has countless times served platform molecular self-assembly on-surface synthesis carbon-based nanoarchitectures...
Engineering quantum phenomena of two-dimensional nearly free electron states has been at the forefront nanoscience studies ever since first creation a corral. Common strategies to fabricate confining nanoarchitectures rely on manipulation or applying supramolecular chemistry principles. The resulting nanostructures do not protect engineered electronic against external influences, hampering potential for future applications. These restrictions could be overcome by passivating with chemically...
Mixed ferrite system of com position Nix Fe3−x O4 Where (x= 1,1.25,1.5,2) (inverse spinel) has been prepared in nano form. Ni and Fe nitrates are mixed shacked thoughrly, then NaOH used as a precipitating agent. Obtained samples were washed by the ionized water ethanol. Finally dried at 70°C for one day ingots have annealed different temperatures. XRD ME spectra measured. It was found that particle size increases increasing annealing temperature. All T ⩽ 650°C show superparamagnetic effects....
In this study ZnO nanoparticles have been prepared by sonochemical method (also known as sonochemitry).The aim of using is the simplicity obtaining in small times and without any heating to initiate chemical reaction.Different with other traditional methods, based on acoustic cavitations.The formation, growth collapse bubbles liquid were generating localized hot spots very high temperatures 5000-25,000 K.These are enough reaction.ZnO sizes range (28-24 nm) obtained changing time sonication,...
In the present study ZnO nanoparticles have been synthesized using sonochemical technique at different ultrasonic exposure power.The powers were 20%, 40% and 60% of total power generator (operating 20 kHz with a maximum output 250 W).The experimental procedures carried out in Ultrasonic Lab, National Institute for Standards, Egypt.ZnO samples investigated by X-ray diffraction (XRD), Transmission Electron Microscope (TEM), UV visible Absorption Fourier Transform Infrared Spectroscopy...
Abstract Glasses doped with transition metal (TM) ions exhibit rich optical transitions spanning the entire ultraviolet, visible, and infrared spectral regimes. Here we utilize melt-quenching techniques to synthesis binary-TM-doped borate glasses of composition x CuO-(75- )B 2 O 3 - 24.7Li 0.3Cr , = 0, 0.2, 1.0 2.0 mol %. We identify several from Cr 3+ 6+ Cu 2+ ions, latter manifests at longer wavelengths gains higher intensity additives. Despite concentration being fixed, peaks are quenched...