A5045955741- Diamond and Carbon-based Materials Research
- Metal and Thin Film Mechanics
- Advanced Surface Polishing Techniques
- Semiconductor materials and devices
- Force Microscopy Techniques and Applications
- Electrohydrodynamics and Fluid Dynamics
- Advanced materials and composites
- Membrane Separation Technologies
- Electrospun Nanofibers in Biomedical Applications
- High-pressure geophysics and materials
- Ion-surface interactions and analysis
- Electronic and Structural Properties of Oxides
- Laser Material Processing Techniques
- Lubricants and Their Additives
- Nanowire Synthesis and Applications
- Laser-Ablation Synthesis of Nanoparticles
- Supercapacitor Materials and Fabrication
- Carbon Nanotubes in Composites
- Silicon Nanostructures and Photoluminescence
- Surface Modification and Superhydrophobicity
- Enhanced Oil Recovery Techniques
- Biodiesel Production and Applications
- Petroleum Processing and Analysis
- Advanced Fiber Laser Technologies
- Solar-Powered Water Purification Methods
Aswan University
2015-2024
Kyushu University
2015-2024
Egypt-Japan University of Science and Technology
2023-2024
National Institute of Advanced Industrial Science and Technology
2022
Ion Exchange (India)
2021
North Carolina State University
2020
Owing to bio-polymer's low-cost, environmental friendliness and mechanically stable nature, calcium alginate microcapsules have attracted much interest for their applications in numerous fields. Among the common production methods, Electrospraying technique has shown a great potential due smaller shape capsule ease of control independent affecting parameters. Although one factor at time (OFAT) can predict trends parameter effect on size sphericity, it is inefficient explaining complex...
Abstract Nanofluids for enhanced oil recovery offer a breakthrough solution towards tertiary and consequently higher production. Their ability to reduce interfacial tension, alteration of formation’s wettability, adsorption capacity, acceleration disjoining pressure makes them excellent candidates recovery. The main objective this paper is investigate the effect polymers on zinc oxide (ZnO) nanofluids (EOR) role played by chemical modification using polymer stabilizers nanoparticle stability...
Nitrogen-incorporated ultrananocrystalline diamond/hydrogenated amorphous carbon composite (UNCD/a-C:H) films were synthesized in nitrogen and hydrogen mixed gas atmospheres by coaxial arc plasma deposition. The temperature dependence of electrical resistivity implies that carriers are transported hopping conduction. Heterojunctions comprising 3 at. % nitrogen-doped p-Si substrates exhibited a typical rectifying action. expansion depletion region into the film side was confirmed from...
Ultrananocrystalline diamond/hydrogenated amorphous carbon films were synthesized by coaxial arc plasma deposition. The morphological and structural evolutions of the driven laser irradiation (ArF, 193 nm, 20 ns) are examined at different energies (0.4–1 J cm−2). Up on irradiation, revealed hydrogen effusions accompanied transformation sp3 into sp2-hybridization carbon. However, film irradiated 0.8 cm−2 exhibited higher fractions, which can be attributed to that: a specific value energy...
Diamond is one of the fascinating films appropriate for optoelectronic applications due to its wide bandgap (5.45 eV), high thermal conductivity (3320 W m-1·K-1), and strong chemical stability. In this report, we synthesized a type diamond film called nanocrystalline (NCD) by employing physical vapor deposition method. The synthesis process was performed in different ratios nitrogen hydrogen mixed gas atmospheres form nitrogen-doped (n-type) NCD films. A high-resolution scanning electron...
n-Type (phosphorus-doped) diamond is a promising material for diamond-based electronic devices. However, realizing good ohmic contacts phosphorus-doped diamonds limits their applications. Thus, the search non-conventional has become hot topic many researchers. In this work, nanocarbon electrodes with enhanced carrier collection efficiency were deposited by coaxial arc plasma deposition. The fabricated extensively examined in terms of specific contact resistance and corrosion resistance....
Chitosan microcapsules draw attention due to their biodegradability, biocompatibility, antibacterial behavior, low cost, easy processing, and the capability be used for different applications. This study utilized electrospraying technique chitosan formulation. As a novel cross-linking agent, mixture of oxalic acid sodium phosphate dibasic was as collecting solution first time in microcapsules. Scanning Electron Microscopy (SEM) optimize spherical morphology size experimentally obtained The...
Abstract Nitrogen-doped ultra-nanocrystalline diamond/hydrogenated amorphous carbon composite films prepared in hydrogen and nitrogen mixed-gas atmospheres by coaxial arc plasma deposition with graphite targets were studied electrically chemical-bonding-structurally. The electrical conductivity was increased doping, accompanied the production of n-type conduction. From X-ray photoemission, near-edge absorption fine-structure, forward-scattering, Fourier transform infrared spectral results,...
A laser-induced doping method was employed to incorporate phosphorus into an insulating monocrystalline diamond at ambient temperature and pressure conditions. Pulsed laser beams with nanosecond duration (20 ns) were irradiated on the substrate immersed in a phosphoric acid liquid, turns, thin conductive layer formed its surface. Phosphorus incorporation depth range of 40–50 nm below surface confirmed by secondary ion mass spectroscopy (SIMS). Electrically, areas exhibited ohmic contacts...
We report the fabrication of p-n+ diamond homojunction through an innovative approach laser irradiation in liquid-ambient. A shallow phosphorus-doped layer with a high electric conductivity is processed on top p-type substrate to form homojunction. The current–voltage measurements at room temperature confirmed induced n+ and showed exceptional rectification properties ideality factor 1.07, excellent low on-resistance 3.7 × 10−2 Ωcm2, current density over 260 Acm−2 forward-biasing 10 V....
Abstract We report on negative bias-enhanced growth of quenched-produced diamond films titanium using hybrid coaxial arc plasma deposition at room temperature. Optimizing the bias voltage to −40 V resulted in a spontaneous formation carbide interfacial layer, which caused significant increase adhesion strength from 16 48 N. Selective etching undesired sp 2 –C bonded atoms and ultrafast quenching energetic carbon ions (C + ) promoted dense 3 atoms, achieving superhardness 96 GPa, comparable...
Abstract In this work, we demonstrate the first achievement in heteroepitaxial growth of β -Ga 2 O 3 thin films on single crystalline diamond (111) wafers using RF magnetron sputtering. A monoclinic ( -phase) structure with a monofamily { <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mover> <mml:mn>2</mml:mn> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> 01} plane was obtained. XRD pole figure shows <mml:mover accent="true"> <mml:mrow> </mml:mrow>...
Abstract 3 at. % nitrogen-doped ultrananocrystalline diamond/hydrogenated amorphous carbon composite (UNCD/a-C:H) films were synthesized by coaxial arc plasma deposition. Optically, the possess large absorption coefficients of more than 10 5 cm −1 at photon energies from to eV. The optical band gap was estimated be 1.28 This value is smaller that undoped films, which might attributable increased sp 2 fractions. temperature dependence electrical conductivity implies carrier transport follows...