Mohamed Khairy Abdel-Fattah Omran

Benha University · Department of Chemistry

This study looks at the structural, optical properties, and comparative visible light photocatalytic activity of Ag/Au-TiO2 doped nanotubes and the impact of embedding them in rGO. The studied materials were characterized using XRD, SEM, TEM, XPS, BET, Raman spectra, diffuse reflectance spectroscopy (DRS), electrochemical impedance spectroscopy (EI...

In this work, paste@TiO2 nanocomposite was manufactured via an ultrasonication process, and the obtained nanomaterials were investigated using various characterization techniques (XRD, BET, SEM, and FTIR). The findings indicated a high crystallinity of the paste@TiO2 nanocomposite material with a crystallite size of 12.16 nm and a specific surface...

The present work was designed to study several functions of Silk coated with polyaniline (PANI), graphene oxide (GO), and a composite of PANI@GO. The samples were characterized by XRD, SEM, FTIR, and thermal analysis. The investigated fabrics' resistivity, weight gain, tensile strength, elongation, and antimicrobial efficiency were monitored accord...

Mn3O4/graphene nanocomposites with different ratios (M1G1, M1G3 and M3G1) were successfully synthesized by a deposition-solvothermal process. The composites were well characterized with different tools such as TEM-SAED, XRD, FTIR, Raman techniques, and N2 adsorption. The electrochemical characteristics of the nanocomposites were evaluated using cyc...

We report on synthesizing rare-earth yttrium oxide-doped ZnO nanoparticles through high-energy planetary milling approach. The impact of varying dopant content in the 3.0, 5.0 to 7.0 wt% range on microstructural, optical and electrical properties of ZnO nanoparticles has been successfully explored. The XRD data showed the existence of a hexagonal w...

Activated carbon (AAC), NiFe2O4, and binary nanocomposites of NiFe2O4 and AAC electrodes have been prepared for supercapacitor applications. Nickel ferrite (NiFe2O4) was prepared using four different ways: electrospinning, hydrothermal, sol–gel, and green method. The samples were characterized by XRD, FT-IR, SEM, TEM, and BET techniques. The result...

The nanocrystalline ZnMn2-xCrxO4 (x= 0, 1, 2) were successfully synthesized by combustion method. The products were characterized by XRD, FTIR, SEM, and TEM. XRD results revealed the formation of cubic phase spinel structure for ZnCr2O4 and ZnMnCrO4 as well as tetragonal spinel crystal structure for ZnMn2O4. The FT-IR data displayed two absorption...

Nanoparticle materials have received increasing attention in the functional modification of textiles. In this work, pure TiO 2 , Ag-doped TiO 2 , Fe-doped TiO 2 , and graphene oxide nanoparticles were used to impart the anti-bacterial and adsorptive properties of nanoparticles to cotton fabric. The treated fabric materials were investigated by X-ra...

Herein, TiO2@ZnO nanocomposites were prepared via ultra-sonication using gelatin as a stabilizing agent. The structural characterization revealed the development of a rutile TiO2 phase that monotonically increased with TiO2 loading as confirmed by the Raman active modes. The micrographs indicated reduced size spherical structures endorsing the XRD...

In this paper, Sn-doped TiO 2 nanomaterials with varying concentrations were manufactured through a simple procedure. The fabricated TiO 2 and Sn loaded on TiO 2 nanoparticles were studied using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, energy dispersive X-rays, Fourier transform infrared spectroscopy, and r...

Graphene nanosheets (G), polyaniline (PANI), nanocrystallites of V-doped Li 4 Ti 5 O 12 (V-LTO), and LiMn 2 O 4 (LMO) were synthesized to be used as electrodes in supercapacitors and hybrid BatCap. The composite electrode material (LTO-T) containing PANI was prepared through the polymerization process. Materials were characterized by XRD, XPS, FT-I...

Multifunctional cotton textile nanocomposites are well developed by the functionalization of cotton with pure TiO 2 , Ag-, Fe-doped TiO 2 , and graphene oxide nanoparticles via sol-gel and modified Hummer methods. The treated fabrics materials are investigated by XRD, FT-IR, and SEM. The obtained treated fabrics have been used as an adsorbent for t...

Cobalt ferrite (CoFe 2 O 4 ) nanoparticles were synthesized through three different routes (chemical co-precipitation, ceramic, and sol-gel). The products were characterized by XRD, SEM, TEM, Raman spectroscopy, FTIR, photoluminescence (PL), BET, XPS, vibrating sample magnetometer (VSM). The X-ray analysis validates the spinel structure of the samp...

A comparison was made between the structure and electrochemical properties of CuFe2O4 nanoparticles prepared by five different preparation methods, involving the co-precipitation, green sol–gel, green hydrothermal, auto-combustion, and microwave. The obtained ferrites were characterized by FT-IR, XRD, BET, SEM, and TEM techniques. A spinel crystal...

Nanocrystallites of pure and mixed ternary ferrites, NiFe2O4 (NiF), CuFe2O4 (CuF), CoFe2O4 (CoF), Ni0.5Cu0.5Fe2O4 (CuNiF), Ni0.5Co0.5Fe2O4 (NiCoF), and Cu0.5Co0.5Fe2O4 (CuCoF) were prepared using the auto-combustion method employing urea as a fuel. The obtained materials were investigated by Fourier transform infrared spectroscopy (FTIR), X-ray dif...

Polyaniline (PANI), and nanocrystallites of pure Li4Ti5O12 (LTO) and V-doped Li4Ti5O12 (V-LTO) spinel structure have been synthesized. The pure and doped Li4Ti5O12 was synthesized by solid-state reaction, whereas the samples containing PANI were prepared by the in-situ oxidation polymerization method. As-prepared materials were characterized by XRD...

Silver decorated copper doped zinc oxide nanoparticles (Ag@Cu-ZnO) were successfully prepared via sol gel method. X-ray diffraction analysis revealed ZnO wurtzite crystalline structure with the existence of minor peaks attributed to Cu and Ag. The presence of Cu and Ag in addition to ZnO lattice was supplementary verified by EDS data while the shif...

Ba-doped ZnO nanostructures (0.8–4 mmol) were successfully fabricated by the co-precipitation method. X-ray diffraction analysis indicated that all samples exhibited a typical hexagonal wurtzite ZnO structure with the emergence of BaO phase. Moreover, the incorporation of Ba resulted in an increase of crystallite size and lattice parameter while mi...

A liquid precipitation method was used to prepare zinc oxide nanoparticles in three diverse media: water, methanol, and ethylene glycol. The studied materials were examined by scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, and ultraviolet-visible spectroscopy. X-ray diffraction patterns showed a hexagonal...

An approach involving ultrasonic irradiation/hydrothermal route was employed for fabricating a series of ZnO nanospheres-carbon nanotubes (Z/CNT) and reduced graphene oxides (Z/GO) nanocomposites, at different weight % ratios of both. The synthesized catalysts were tested in heterogeneous photocatalytic degradation of 4-nitrophenol (4-NP, 10 ppm) v...

The solubility of nickel ferrite and zinc ferrite in an aqueous solution of acetic acid was studied gravimmetrically by varying the concentration of acetic acid at different temperatures ranging from 25 to 45 °C. The molar solubility and thermodynamic parameters of nano nickel and nano zinc ferrites have been evaluated. In this work, we observed ho...

The effect of particle size and morphological structure on the electrical and electrochemical properties of ZnO (nanowires, nanorods, and nanospheres) prepared by two various routes: soft-wet and dry methods were investigated. The electrochemical performance is analyzed by cyclic voltammetric and galvanostatic charge–discharge measurements in 1 M K...

Due to the undesirable consequences of using platinum in direct methanol fuel cells, including high cost and voltage loss due to CO poisoning, new metals, such as silver, palladium, and nickel, have been examined. These new metals have shown promising results as electrocatalysts in methanol oxidation. The mechanistic aspects of these nonplatinum me...

A simple deposition method for synthesizing different loadings of Ag2O@Ag (0.4%–8.5%) coated oxygen functionalized carbon nanotubes (CNT); using a triblock copolymer template, is adopted followed by annealing at different temperatures (250 °C and 400 °C). These synthesized materials are characterized by XRD, TEM-SAED, N2 sorptiometry, XPS and photo...

Nickel ferrite (NiFe2O4) nanoparticles are prepared through different routes (microwave, co-precipitation, and pyrolysis) and tested for water purification applications through adsorption removal of an acid red dye B as a model organic pollutant. The characterizations of the prepared samples were done using XRD, FT-IR, SEM, TEM, BET, UV-Vis absorba...

Zinc oxide (ZnO) nanocrystallites with different weight ratios are incorporated into carbon nanotubes (ZnO/CNTs) or graphene oxide (ZnO/GO) nanohybrids using ultrasonication/hydrothermal approach. The produced nanohybrids were tested in heterogeneous photocatalytic degradation of methylene blue dye (MB) under visible light illumination and in-situ...

Nanocomposites of hexagonal ZnO nanorods incorporated into carbon nanotube-graphene (ZnO/CNT-GO) were prepared using a simple hydrothermal approach. The structure, light absorption, surface texturing, and morphology characterizations have established the strong interaction between ZnO, carbon nanotubes, and graphene oxide components because of the...

[email protected] 2 O/RGO nanocomposites with different loads of Ag (0.4%–8.5%) were synthesized using a simple deposition method in the presence of a triblock copolymer template at different annealing temperatures (250 °C and 400 °C). All samples were characterized with various techniques such as XRD, FTIR, Raman, TEM-SAED, N 2 sorptiometry and UV...

Nano-crystalline cupper ferrites (CuFe2O4) were synthesized by co-precipitation, solid-state reaction, thermal decomposition, sol-gel, and solution auto combustion methods. The samples were characterized by several techniques including XRD, FT-IR, SEM, TEM, and BET. Differences in crystallinity, surface area, particle size, magnetic parameters and...

Various energy devices with enhanced performance can be fabricated based on nanostructured carbons and conducting polymeric electrolytes. For instance, supercapacitors are attractive energy storage devices due to their high power density. In the present work, supercapacitors are fabricated using synthesized carbon aerogel as an active electrode in...

In this work, the effect of graphene and nitrogen doping on the performance of dye-sensitized solar cells of pure TiO2 was studied. Pure and N-doped TiO2 nanoparticles were synthesized using a hydrothermal method, while graphene was prepared through the reduction of graphene oxide. The materials were characterized using x-ray diffraction (XRD), x-r...

A simple hydrothermal route assisted by a triblock copolymer was used to synthesize Ag 2 O/Ag nanoparticles on a robotic support consists of functionalized MWCNTs and graphene composite (Ag 2 O/Ag/CNT-graphene). The composites together with the individual analog of Ag/CNT and Ag/graphene were characterized by means of XRD, TEM-SAED, N 2 sorptiometr...

The synthesis of nitrogen, boron, and nitrogen–boron-codoped graphenes was attained via mixing solutions of GO with urea, boric acid, and a mixture of both, respectively, followed by drying in vacuum and annealing at 900 °C for 10 h. These materials were thoroughly characterized employing XRD, TEM, FTIR, Raman, UV–vis, XPS, IPCE%, and electrical co...

A novel hetero-junction anode composed of NiWO4/WO3, formed at various metal molar ratios (Ni/W) and fabricated hydrothermally via simple salt solution addition method using polyethylene glycol, was characterized using XRD, TEM-SAED, N2 sorptiometry, UV–Vis diffuse reflectance and FTIR spectrometry. Increasing NiO especially at the Ni/W ratio of 4...

Graphene nanosheets, polyaniline (PANI), and nanocrystallites of transition metal ferrite {Fe3O4 (Mag), NiFe2O4 (NiF), and CoFe2O4 (CoF)} have been prepared and characterized via XRD, FTIR, SEM, TEM, UV–vis spectroscopy, cyclic voltammetry, galvanostatic charge discharges, and impedance spectroscopy. Electrochemical measurements showed that superca...

Graphene nanosheets (G) and pure, as well as doped Mg-, Mn-, V-Li4Ti5O12, spinel structure have been synthesized. As-prepared materials were characterized by X-ray powder diffraction (XRD), FT-IR, scanning electron microscopy (SEM), cyclic voltammetry, and constant current discharge methods. The physical properties, as well as the possible role of...

Cu and N-doped TiO2 photocatalysts were synthesized from titanium (IV) isopropoxide via a microwave-assisted sol-gel method. The synthesized materials were characterized by X-ray diffraction, UV-Vis diffuse reflectance, photoluminescence (PL) spectroscopy, SEM, TEM, FT-IR, Raman spectroscopy, photocurrent measurement technique, and nitrogen adsorpt...

PMMA/ZnO nanocomposites with different concentrations of nano-ZnO were prepared by in situ polymerization method. The effect of ZnO on the morphology, optical properties and thermal degradation kinetics of PMMA was investigated by means of XRD, TEM, FTIR, TG–DSC, photoluminescence (PL) spectra and UV–visible absorption spectra. The introduction of...

Titanate-SWCNT; synthesized via exploiting the interaction between TiO2 anatase with oxygen functionalized SWCNT, supported Ag nanoparticles and Ag/titanate are characterized using XRD, TEM-EDX-SAED, N2 adsorption, Photoluminescence, Raman and FTIR spectroscopy. These samples are tested for methanol electrooxidation via using cyclic voltammetry (CV...

Nano-sized aluminates of Nix Co1−x Al2O4 (0 ≤ x ≤ 1) were synthesized by sol gel-combustion method using cetyltrimethyl ammonium bromide (surfactant) and polyethylene glycol as templates and glycine as a fuel. The samples were characterized for their structural, surface morphological, optical and magnetic properties by means of X-ray diffractions (...

Abstract Bi2O3-SnO2 nanocomposites formed at a nominal molar ratio of 3:1 and loaded with Pd/Pt nanoparticles synthesized by a sol gel-hydrothermal method with the aid of a template were thoroughly characterized by X-ray diffraction, TEM-EDX, N2 sorptiometry, diffuse reflectance UV-Vis, FTIR, photoluminescence and electrical conductivity. It has be...

M-doped TiO2 nanoparticles (M = Cu, Zn) were prepared by the sol–gel method. X-ray diffraction (XRD), scanning electron microscopy (SEM), FT-IR and UV–vis spectroscopy techniques were used to characterize the samples. Photocatalytic activities of samples for methyl orange (MO) degradation and the chemical oxygen demand (COD) were investigated. XRD...

Nano-sized magnetite (Fe3O4) was prepared using dry and wet chemical methods in presence of surfactants as capping agents. The synthesized materials were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The X-ray diffraction patt...

Zn0.2Mn0.8Fe2O4 ferrite nanoparticles coated with polyaniline, forming a composite structure, were synthesized by in situ chemical oxidation polymerization at different ferrite weight ratio (PANI/ZnMn ferrite = 30% and 50%). The ZnMn ferrite nanoparticles were prepared by the sol-gel combustion method using metal nitrates as precursors. The structu...

The aim of this study was to determine the thermodynamics of the solvation of Pb(NO3)2in mixed propanol-H2O solvents , which is very toxic heavy metal salt at different temperatures. The Gibbs free energies as very important thermodynamic property were evaluated for Pb(NO3)2 in mixed propanol-H2O solvents at different temperature from the experimen...

Nickel ferrite (NiFe2O4) nanoparticles were prepared using sol–gel technique; while Polyaniline (PANI)/NiFe2O4 nanocomposites were synthesized via chemical oxidative polymerization of aniline monomer (ANI) in the presence of various ferrite amounts (nickel ferrite/ANI = 2.5, 5, 25 and 50 wt%). The morphology, structure, magnetic, electrical and mic...

The molal solubility for nano zinc oxide (ZnO) , copper (2%) doped ZnO , Fe(2%) doped ZnO , Ti(2%) doped ZnO , Ag (25) doped ZnO in 50%DMF and 50% DMSO, (v/v), volume to volume were measured at 293.15, 303.15 , 313.15, 323.15K .The thermodynamic parameters, Gibbs free energy of solvation, enthalpies and entropies of solvation were evaluated for nan...

Polyaniline-NiFe2O4 nanocomposites (PANI-NiFe2O4) with different contents of NiFe2O4 (2.5, 5 and 50 wt %) were prepared via in situ chemical oxidation polymerization, while the nanoparticles nickel ferrite were synthesized by sol-gel method. The prepared samples were characterized using some teqniques such as Fourier transforms infrared (FTIR), X-r...

Nano-crystalline CoFe2O4 particles were synthesized through thermal decomposition of cobalt tartrate- ferric tartrate at 250, 450, 750 and 1050oC. The samples were characterized by XRD, DSC-TG, SEM, TEM and FT-IR. The XRD analysis showed that the sample calcined at 1050 oC exhibit pure spinel phase. The crystallite sizes lie in the range of 30 – 61...

The electrical properties of the ternary ionic conducting glass system xAgI–(1 – x)[0.67Ag2O–0.33B2O3], where x = 0.4 , 0.5, 0.6, 0.7 and 0.8, were studied for emphasizing the influence of silver iodide concentration on the transport properties in the based borate glasses. The glasses were prepared by melt quenching technique and characterized usin...

A nanoparticle size disperse dye treated with ultrasound has been applied on polyester fabric without using a carrier. Various dyeing and process parameters used are studied in detail, such as K/S values, dye particle size, dye exposure to ultrasound waves, printing paste pH, steaming conditions of prints, morphological study using SEM and TEM of d...

Nano-sized magnetite (Fe3O4) nanoparticles were prepared using dry and wet chemical methods in presence of surfactants as capping agents. The samples were characterized by X-ray diffraction, FT-IR, thermal analysis (DTA and TG), Electron microscopy (SEM) as well as (TEM), dynamic laser scattering analyzer (DLS) and vibrating sample magnetometer (VS...

Silver nanoparticles and silver/silica nanocomposite were prepared by a chemical reduction method in presence of dispersing agents. The samples were characterized by XRD, SEM, TEM and UV-vis spectroscopy. The results revealed that the silver nanoparticles are in the size range of 36 -61 nm. The mean sizes and shapes of the nanoparticles can be fine...

The chemical wet processing of textiles continues to expand each year using new technologies. The driving force being the need for cleaner, cost-effective and value added textile products. It is well known that, wool fabrics can be colored easily with acid, basic, direct, metal complex and reactive dyes while disperse dyes are used to colorate poly...

Nanosized Fe0.1Zn0.9Mn2O4 particles were prepared by hydrothermal method in absence and presence of surfactants. Transmission electron microscopy (TEM), scanning electron microscopy (SEM) and powder x-ray diffraction (XRD) techniques were employed for the characterization of the nanoparticles. Photocatalytic activity and electrical properties (DC-...

The kinetics of thermal decomposition of Ca(II)-, Sr(II)- and Ba(II)- cross-linked metal–alginate biopolymeric complexes as biocatalysts have been studied using thermogravimetric (TG) and differential thermogravimetric (DTG) techniques in static air. The TG curves showed three stages of weight loss, whereas the DTG indicated the presence of a serie...

Nanosized Cu0.1Zn0.9Mn2O4 were prepared by hydrothermalmethod in absence and presence of surfactants. The samples were characterized using XRD, SEM and TEM. All samples showed spinel crystal structure with crystallite sizes depending on the preparation method and lay in the range of 17-89 nm. Electrical conductivity as a function of frequency and t...

Nano Co0.1Zn0.9Mn2O4 samples were prepared by hydrothermal method in absence and presence of surfactants. The samples were characterized using XRD, SEM and TEM. Magnetic and electrical properties (DC- and AC-conductivity) were studied. Influences of gamma radiation on the properties studied were investigated. All samples showed tetragonal spinel cr...

Nano zinc manganite (ZnMn2O4) samples have been prepared using hydrothermal method in presence and absence of surfactants. The samples were characterized by XRD, FT-IR, and electron microscopy (SEM) as well as (TEM). Catalytic activity for investigated samples as well as, dc- and ac-electrical conductivity as a function of frequency and temperature...

The micro-mesoporous TiO2 materials obtained from hydrothermal crystallization of polyols (xylitol, glucose and sorbitol)/TiCl4/acetylacetone/H2O systems were characterized; and compared with VOx/TiO2, by N2-sorption, TG/DTA, X-ray diffraction, IR and scanning electron microscope. Through comparison of the results, it was found that glucose assembl...

Nano-structured titanium dioxide materials were synthesized hydrothermally (TiCl4, 353 K, 5 days) via assembling through cationic surfactants in particular cetyltrimethylammonium bromide (CTAB) and cetylpyridinum bromide (CPB). The bulk chemical and phase compositions, crystalline structure, particle morphology, thermal stability and surface textur...

Nanostructured titanium dioxide and vanadium oxide supported over titanium dioxide was synthesized using a template synthesis route method under hydrothermal conditions (at 353 K for 5 days) via sodium dodecyl sulfate surfactant. The influence of pH (2.0–9.0) and thermal treatment (623 and 773 K) on the structural, surface acidity and textural prop...