
S.h. KenawyNational Research Centre | NRC · Department of Ceramics and Building Materials
S.h. Kenawy
Professor
About
102
Publications
17,494
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
579
Citations
Introduction
The current researches are dealing with synthesis and characterization of nano-ceramic and ceramic composites via wet precipitation and plasma coating methods. The synthesized nano-ceramic materials and composites have wide applications in the field of biomedical (Especially Treatment of cancer), Treatment of water pollution and structural applications.
The prepared nano-materials characterized by different techniques such as XRD, XPS, SEM and EDX, TEM, FTIR , Particle size analyzer, thermal expansion, DTA and Microhardness.
Publications
Publications (102)
Developing and evaluating enhanced biocomposites for medication delivery and bone regeneration is the main goal of this research. A unique wet precipitation chemical process was used to create calcium silicate (CaO–SiO₂) biocomposites, with different amounts of calcium hexaboride (CaB₆) incorporated as an additive. The biocomposite samples were sub...
Recently, there is an increasing interest to investigate the efficiency of porous ceramic composite materials. There are many products made of porous ceramic; such as membranes, catalytic substrates and filters. This is due to their excellent properties in terms of high temperature stability, high permeability, excellent catalytic activity and low...
Nanomaterials exhibit distinct characteristics from conventional materials as a result of their extensive surface area and condensed dimensions. Additionally, it possesses unique and outstanding functionalities that render it a valuable addition to asphalt pavement. The optimal production process parameters were determined by the characteristics of...
Bacterial infections that cause chronic wounds provide a challenge to healthcare worldwide because they frequently impede healing and cause a variety of problems. In this study, loaded with tungsten oxide (WO3), Magnesium oxide (MgO), and graphene oxide (GO) on chitosan (CS) membrane, an inexpensive polymer casting method was successfully prepared...
Spin-polarized density functional theory (DFT) calculations are employed to investigate the catalytic activity of the Al decorated C 2 N monolayer (Al@C 2 N) as a single atom catalyst for carbon monoxide (CO) oxidation. The binding energy of the Al atom in Al@C 2 N (-4.18 eV) is more than the cohesive energy of bulk Al system (-3.39 eV/atom), confi...
Two organoselenium thiourea derivatives, 1-(4-(methylselanyl)phenyl)-3-phenylthiourea (DS036) and 1-(4-(benzylselanyl)phenyl)-3-phenylthiourea (DS038) were produced and categorized using FTIR and NMR (¹H and ¹³C). The effectiveness of the above two compounds as C-steel corrosion inhibitors in molar HCl was evaluated using the potentiodynamic polari...
The aqueous basic systems NiSO4·6H2O/K2S2O8 (pH = 14) and NiSO4·6H2O/KBrO3 (pH = 11.5) were investigated for the catalytic conversion of benzyl alcohol and some para-substituted benzyl alcohols to their corresponding acids in 75–97% yields at room temperature. The active species was isolated and characterized using scanning electron microscopy (SEM...
A simple and eco-friendly electrochemical sensor for the anti-inflammatory diclofenac (DIC) was developed in a chitosan nanocomposite carbon paste electrode (M-Chs NC/CPE). The M-Chs NC/CPE was characterized with FTIR, XRD, SEM, and TEM for the size, surface area, and morphology. The produced electrode showed a high electrocatalytic activity to use...
Mixed ligand complexes of Pd(II) and Cd(II) with N-picolyl-amine dithiocarbamate (PAC-dtc) as primary ligand and tertiary phosphine ligand as secondary ligands have been synthesized and characterized via elemental analysis, molar conductance, NMR (1H and 31P), and IR techniques. The PAC-dtc ligand displayed in a monodentate fashion via sulfur atom...
The calcium silicate composite doped with ZnO presented a good resolution of tramadol-induced seizures accompanied by detoxification of blood, indicating its potential for application in such cases. Further studies are required
Background
Seizures are considered to be the most common symptom encountered in emergency- rushed tramadol-poisoned patients; accounting for 8% of the drug-induced seizure cases. Although, diazepam clears these seizures, the risk of central respiratory depression cannot be overlooked. Henceforth, three adsorbing composites were examined in a tramad...
Metal oxide like zinc oxide (ZnO) is recognized to be one of the versatile inorganic compounds due to its physical properties. Crystalline compositions, morphology, particle size, and chemical bonds of pure hydroxyapatite (HA) and ZnO/HA were characterized by x-ray diffraction (XRD), Scanning and transmission electron microscopy (SEM and TEM), Four...
Metal oxide like zinc oxide (ZnO) is recognized to be one of the versatile inorganic compounds due to its physical properties. Crystalline compositions, morphology, particle size, and chemical bonds of pure hydroxyapatite (HA) and ZnO/HA were characterized by X-ray diffraction (XRD), Scanning and transmission electron microscopy (SEM and TEM), Four...
In the present work; the impact of the solar and electrical energy on microstructures, crystalline phases and mechanical properties in the binary aluminum borate/alumina ceramic composite, prepared by wet method were studied. Solar and electrical energy were employed by sintering the prepared samples at 1400 °C then thermally shocked at 1200 °C and...
Background
Seizures are considered to be the most common symptom encountered in emergency- rushed tramadol-poisoned patients; accounting for 8% of the drug-induced seizure cases. Although, diazepam clears these seizures, the risk of central respiratory depression cannot be overlooked. Henceforth, three adsorbing composites were examined in a tramad...
The aim of this work is to study the effect of various talc rocks for the preparation of talc-based cordierite ceramics. Raw talc and sintered cordierite-based ceramic samples (1000-1375ºC for 2 h) were characterized using XRD, XRF, TGA-DTG, laser PSDs, Archimedes method, SEM-EDAX and dielectric relaxation spectrometer (DRS). Results show that impu...
The aim of this work is to study the effect of various talc rocks for the preparation of talc-based cordierite ceramics. Raw talc and sintered cordierite-based ceramic samples (1000-1375ºC for 2h) were characterized using XRD, XRF, TGA-DTG, laser PSDs, Archimedes method, SEM-EDAX and dielectric relaxation spectrometer (DRS). Results show that impur...
Textiles are now used in a wide range of industries and purposes, including the medical field. The medical, hygiene,
and health sector is a rapidly growing and vital component of the textile industry.
Growth can be attributed to the expansion and advancement of technology in both the textile and medical sectors
at the same time. Surgical gowns are...
The aim of the present research is to investigate the role of three composites samples based on ZrSiO4/Al2O3 ratios (ZA91, ZA73, and ZA55) on the attenuation of gamma rays and fast neutrons. The sintering of the samples at 1450 °C/3h show the formation of composite of zircon and corundum and their microstructure varying from irregular and directed...
The biocompatibility, antimicrobial activity, and dielectric properties of hydroxyapatite (HA) doped with different percentages of ZnO were studied. Hydroxyapatite was developed in samples heat-treated at 900°C/4 h; not affected by the addition of ZnO. The microstructure showed euhedral and subhedral hydroxyapatite crystals dispersed singly or accu...
Calcium silicate/calcium hexaboride (CaB6) composites were prepared via the wet precipitation chemical method. High quartz, calcium silicate (CaSi2O5), calcium hexaboride with weak cristobalite are the phases detected by XRD after heat-treatment at 550 °C/2h. The thermal behavior shows clear exotherms at 821-889 °C and 950 °C which reflect the deco...
Objective
To evaluate bioactivity and osteogenic potential of calcium silicate (CS)-doped iron oxide (Fe2O3) nanoparticles versus pure CS in the reconstruction of induced critical-sized mandibular defects.
Design
CS-doped Fe2O3 was prepared; morphological and microstructure identification of nanoparticles were made. An in vivo randomised design wa...
Partial substitution of ZnO for CaO in the wollastonite formula was performed via wet precipitation. The effects of ZnO/CaO replacement on the structure, porosity, morphology, optical, and mechanical properties of the CaO-SiO 2 ceramic were examined. Structural results and Fourier transform infrared (FTIR) spectra indicated the existence of mixed p...
Synthesis and characterization of biocomposite materials of hydroxyapatite (HA) and yttrium oxide (Y2O3) were investigated. HA
nanoparticles powder was obtained from mussel shells via a wet chemical precipitation routine. HA powder was doped with 1 and
2 wt% of Y2O3. For microstructural examination, X-ray diffraction (XRD), Fourier transform infrar...
This work aims to valorize a considerable part of solid waste that accumulates in the environment as well as the safe reuse of the treated wastewater. A non-woven fabric of polyethylene terephthalate (PET) was coated with a thin layer of a nano-ceramic material. The inhibitory effect of the nano-ceramic material was evaluated against gram +ve (Stap...
Waste rubber composes a burden on the environment. Consumed rubber does not degrade easily, and disposing of this waste is not a facile process. Worn out tire rubber forms a considerable section of the urban waste materials. It is able to be ground and known as ground tire rubber (GTR). It is favored to be devulcanized before being blended with org...
Based on kaolin and talc, cordierite was prepared through melt quench and ceramic process of two compositions. The sintering process of ceramics between 1000 and 1300 °C shows mainly the manifestation of cordierite with little ratios of spinel, enstatite, mullite and cristobalite. However, the sintering of their corresponding glasses between 1100 a...
The influence of adding 10, 20 and 30% molar ratio of silicon carbide (SiC) separately to a composite of wollastonite (W) with a fixed content of 10%Fe2O3 prepared by wet precipitation method was studied. The crystal structure of the annealed composite powders was inspected by X-ray diffraction (XRD); revealing multi-phase structure. The highest es...
The influence of adding 10, 20 and 30% molar ratio of silicon carbide (SiC) separately to a composite of wollastonite (W) with a fixed content of 10%Fe 2 O 3 prepared by wet precipitation method was studied. The crystal structure of the annealed composite powders was inspected by X-ray diffraction (XRD); revealing multi-phase structure. The highest...
Wollastonite with/without maghemite [(Fe 2 O 3), 0, 3 and 10 wt%] was prepared by facile wet precipitation method. Effect of Fe 2 O 3 presence in the obtained nano-ceramics on physical structure, morphology, size and the mechanical features was evaluated using X-ray diffraction, transmission electron microscope, and universal testing machine. Moreo...
Abstract
Purpose: Praziquantel (PZQ) is a well-known drug accredited by the World Health Organization (WHO) for the treatment of schistosomiasis. It shows poor efficiency in patients during the earliest infection phases. Therefore, the search for new alternative drugs was the intention of many researchers.
The results declare that CS-5% CuO exhibi...
In this study physical properties were determined for ceramic whiskers based on the Al2O3-CaB6 system. Through a wet method and a sintering process between 1400 °C and 1500 °C, aluminium borate (Al18B4O33) was developed from the binary Al2O3 (95-85 %)-CaB6 (5-15 %) system. The whisker microstructure from interlocked fibres (between 8 and 30 µm in w...
In this study physical properties were determined for ceramic whiskers based on the Al2O3-CaB6 system. Through a wet method and a sintering process between 1400 °C and 1500 °C, aluminium borate (Al18B4O33) was developed from the binary Al2O3 (95-85 %)-CaB6 (5-15 %) system. The whisker microstructure from interlocked fibres (between 8 and 30 µm in w...
Ceramics result from combinations and structural arrangements of inorganic substrates for metals and nonmetals. They bind covalently forming ceramic with distinctive properties. Advanced ceramics can be applied in progressive applications. They comprise advanced heat engines for communication and energy transmission. They are developing among the r...
Plants with medicinal properties possess beneficial influences on health and disease. Different plant parts and extracts carry valuable active ingredients with pharmacological properties that lead to developing new drugs. Terminalia bellirica is among those plants that have been formulated as pharmaceutical products. This is attributed to its biolo...
Three-dimensional (3D)-printed systems and nanosystems are highly progressive and
evolving technologies that are rapidly etching their position in the realm of drug delivery
and tissue engineering.
Three-dimensional printing is rapidly forging its niche as an advanced and transformative
build technology holding significant application in pharmaceut...
Hydroxyapatite (HA) nanoparticles derived from mussel shells were prepared using the wet precipitation method and were tested on human mesenchymal and epithelial cells. Shells and HA powder were characterized via X-ray diffraction analysis (XRD) and scanning electron microscopy along with energy dispersive X-ray spectroscopy (SEM/EDX), high resolut...
Hydroxyapatite (HA) nanoparticles derived from mussel shells were prepared using the wet precipitation method and were tested on human mesenchymal and epithelial cells. Shells and HA powder were characterized via X-ray diffraction analysis (XRD) and scanning electron microscopy along with energy dispersive X-ray spectroscopy (SEM/EDX), high resolut...
Water pollution is a serious environmental problem. Methylene blue is among the dyes that may exist in waste water. Adsorption is an effective process to remove dyes from contaminated water. Hybrid membranes based on clay-polymer; namely kaolin and polystyrene were prepared to absorb the present methylene blue in aqueous solution. These membranes w...
Textile fabrics possess multitude applications and a wide variety of highly technical uses. Microfiber is one of the most popular synthetic fibers. Its popularity is a result of special properties such as good resiliency, heat resistance, light weight, water proof and durability. In the present work, two woven fabrics were synthesized from polyeste...
Textile fabrics possess multitude applications and a wide variety of highly technical uses. Microfiber is
one of the most popular synthetic fibers. Its popularity is a result of special properties such as good
resiliency, heat resistance, light weight, water proof and durability. In the present work, two woven
fabrics were synthesized from polyeste...
Mechanical properties of three-dimensional (3D) scaffolds are critical for their biomedical applications. Several methods have been utilized to augment the mechanical properties of the 3D-printed scaffolds. The current chapter focuses on potential techniques that are applicable for the augmentation of mechanical properties of 3D-printed scaffolds....
Cesium-137 (137Cs) and europium-152+154 (152+154Eu) are the main species found in radioactive liquid wastes. Consequently, the study of their removal from wastewater was essential. For this purpose, hydroxyapatite (HA) nanoparticles were produced from calcium-rich bio-wastes (mussel shells) by a wet chemical precipitation technique. The physicochem...
It is important to develop novel, highly bioactive implants with suitable magnetic properties. Nanostructure wollastonites (calcium silicate) with various concentrations of hematite (Fe2O3) up to7% prepared by wet precipitation method and sintered up to (1273 K) were investigated. The developed phases were CaSiO3 of a monoclinic nanocrystalline str...
The present invention relates to the preparation and use of aluminum oxide and silicon carbide composites for the manufacture of a nuclear reactor cladding with a hot-pressing technique. The composites were made of a mixture of alpha-aluminum oxide with a with a mean particle size of less than 100 μm of silicon carbide in the form of granules, plat...
In the original publication of the article, Figs. 8, 9 and 10 were published incorrectly as linear regression.
The sorption process of Co(II) onto nanoparticles of calcium silicate doped with 5% CuO treated by humic acid was evaluated using batch technique. This process follows the second order kinetic model. Equilibrium isotherm models of Co(II) sorp-tion onto the modified composite was 208.91 mg/g. Negative value of free energy change (ΔG 0), confirms the...
The sorption process of Co(II) onto nanoparticles of calcium silicate doped with 5% CuO treated by humic acid was evaluated using batch technique. This process follows the second order kinetic model. Equilibrium isotherm models of Co(II) sorp-tion onto the modified composite was 208.91 mg/g. Negative value of free energy change (ΔG 0), confirms the...
Immigration of radioisotopes in radioactive wastes into the ground water is strongly affected by sorption in the geologic media. A batch technique was used to evaluate the sorption behavior of 60Co radionuclide onto calcium silicate nanoparticles doped with 5% CuO and modified by humic acid. Sorption process follow the second order kinetic model. E...
Highly porous nanofibrillated cellulose aerogel fibers (NFCA) prepared from bagasse pulp was used as a template for in situ preparation of alumina nanorods. NFCA was soaked in aluminum nitrate aqueous solution followed by soaking in ammonium hydroxide solution to generate aluminum hydroxide within the porous structure and at surface of NFCA. Sinter...
Synthesis of silicon carbide (SiC) nanoparticles was carried out using dense plasma focus technology with great potential for future industrial applications. The present work presents the synthesis and coating of aluminum metal with SiC nanoparticles using silica gel and acetylene gas. it also discusses the effects of molar ratio as well as the num...
Purpose: Different compositions of copper oxide (CuO)-doped calcium silicate clusters were used to treat the cancer cells.
Methods: The influence of CuO content on the morphology, drug delivering ability,
physicochemical properties and cytotoxicity was investigated.
Results: The microcrystalline structure revealed the decrement of the size from (20...
Purpose: Different compositions of copper oxide (CuO)-doped calcium silicate clusters were used to treat the cancer cells.
Methods: The influence of CuO content on the morphology, drug delivering ability, physicochemical properties and cytotoxicity was investigated.
Results: The microcrystalline structure revealed the decrement of the size from (20...
Ceramic matrix composites have attracted attention in advanced structural and tribological applications for several decades. Advanced structural ceramics are presently used in diverse tribological applications such as tips for ballpoint pens, precision instrument bearings and cutting tool inserts. Design and selection of ceramics for these applicat...
In this project, single crystal aluminum oxide ceramic was synthesized and characterized in the form of high purity tubes and rods in nano size scale. The preparation technique was based on using a cost effective method and agricultural wastes.
Purpose: Different compositions of copper oxide (CuO)-doped calcium silicate clusters were used to treat the cancer cells. Methods: The influence of CuO content on the morphology, drug delivering ability, physicochemical properties and cytotoxicity was investigated. Results: The microcrystalline structure revealed the decrement of the size from (20...
Mullite powder was chemically synthesized by the sol–gel method and analyzed using SEM and X-ray diffraction. Sorptive removal of cesium and strontium ions from an aqueous solution using the synthetic mullite powder was investigated using the batch technique. Factors expected to influence the sorption process were experimentally examined. Sorption...
Mullite powder was chemically synthesized by the sol–gel method and analyzed using SEM and X-ray difraction. Sorptive
removal of cesium and strontium ions from an aqueous solution using the synthetic mullite powder was investigated using
the batch technique. Factors expected to inluence the sorption process were experimentally examined. Sorption ra...
Mullite powder was chemically synthesized by the sol–gel method and analyzed using SEM and X-ray
diffraction. Sorptive removal of cesium and strontium ions from an aqueous solution using the synthetic
mullite powder was investigated using the batch technique. Factors expected to influence the sorption
process were experimentally examined. Sorption...
A nominal calcium silicate was prepared through wet route and investigated as sorbent for the removal of long-lived radionuclides 134 Cs and 152 þ 154 Eu from aqueous solutions. The physico-chemical properties of the prepared nanomaterial such as FT-IR, SEM, XRD and TEM were examined. Sorption of both 134 Cs and 152 þ 154 Eu onto the nanomaterial f...
Wollastonite clusters doped with/without CuO (0.0-10.0 g/100 g nominal CaSiO 3) were prepared via precipitation route. This method is suitable for the development of wollastonite clusters, as ingenious compared with other costly methods. Wollastonite was developed after heat-treatment at 550°C/2 h, as rounded to sub rounded nano-crystals at the siz...
Whisker-like microstructured ceramic was synthesized using bauxite [Al(OH)3] raw material and boric acid (H3BO3). Stoichiometric (Al18B4O33) and non-stoichiometric compositions were prepared through a ceramic route or a solid reaction method, respectively. The suggested compositional design resulted in two crystalline phases: aluminum borate (Al20B...
A wet method technique was used to prepare nano wollastonite ceramic material doped with 5 % CuO. The gel was fired up to 550 °C. The powder was examined using XRD, HRTEM and SEM supplemented with EDAX. X-ray diffraction analysis (XRD) showed the development of quartz, wollastonite and olivine with/without tenorite. The antibacterial and antifungal...
Wollastonite clusters doped with/without CuO (0.0-10.0 g/100 g nominal CaSiO3) were prepared via precipitation route. This method is suitable for the development of wollastonite clusters, as ingenious compared with other costly methods. Wollastonite was developed after heat-treatment at 550°C/2 h, as rounded to sub rounded nano-crystals at the size...
Copper (Cu) doped calcium silicate nanoparticles were synthesized by a wet precipitation method as an economical bone fracture filler. The aim was to improve the overall physicochemical properties, bioactivity and biological performance of the bone fracture filler prepared herein. The synthesized nanoparticles were evaluated using X-ray diffraction...
Carbon nanotubes (CNTs) are very attractive materials for several potential applications due to their exceptional lightness, extraordinary mechanical, and thermal properties. Ceramics have high stiffness and good thermal stability with a relatively low density, and they are an important constituent in the fabrication of advanced composites where hi...
The synthesis of carbon nanotubes and their different biomedical applications
Nano-particles, within 29-45 nano-meters, based on wollastonite were prepared with/without CuO through wet method. The adsorption process was occurred on nano-particles powder ceramic at different conditions (pH, contact time and dose) for removing of cadmium ions from waste water. The SEM of nano-particles after treatment of waste water revealed t...
Copper oxide nanoparticles doped calcium silicate ceramic were synthesized via co-precipitation method, the particle size could be ranged from 29 - 45 nm. The ceramic doped by copper nanoparticles prepared by the proposed co-precipitation technique was examined to hinder accumulation and reduce the diameter of the particles. The adsorption process...
In the present work, we describe the use of a multi-gamma lines source to determine the linear attenuation coefficient of ceramic material. A high precision germanium detector is used to assess gamma ray transmission. Geometry is adopted to enhance detection of 210Pb gamma-ray line at 46.2 keV. Cascade summing was followed up. The effective density...
The most mutual form of crystalline silica found in workstations is quartz, on the other hand cristobalite and mullite are also present as other forms of crystalline silica. Mullite (3Al2O3.2SiO2) is a well-known, stable compound in the alumina-silica system. Due to its structural advantage, it is the most desirable phase in alumina ceramics. The m...
In the present work, we describe the use of a multi-gamma lines source to determine the linear attenuation coefficient of ceramic material. High precision germanium detector is used to assess gamma-ray transmission. Geometry is adopted to enhance detection of ²¹⁰Pb gamma-ray line at 46.2 keV. Cascade summing was followed up. The effective density o...