Amir Elzwawy | National Research Centre (original) (raw)
Papers by Amir Elzwawy
Polymer bulletin, Jun 13, 2024
Scientific reports, Jan 31, 2024
In the current report, we have successfully synthesized nanocomposites of PMMA incorporating diff... more In the current report, we have successfully synthesized nanocomposites of PMMA incorporating different doping of CeO 2 through a chemical approach. XRD results reflects decent matching for CeO 2 nanoparticles with 29 nm crystallite size. FTIR spectroscopy demonstrates the characteristic functional groups validating the successful formation of the composite. The optical study of PMMA and the nanocomposites has proven that the optical properties such as band gap, refractive index, optical permittivity, and loss tangent factor are affected by adding CeO 2 to the PMMA matrix.The peak residing around 420 nm by UV measurements is allocated to occurring electrons photoexcitation from the valence to conduction band inherent in CeO 2. The dielectric measurements were achieved using broadband dielectric spectroscopy upon a wide span of frequencies (10-1-10 7 Hz) and within temperatures from − 10 to 80 °C with a step of 10 °C. The permittivity decreases by adding CeO 2 and the dielectric parameters are thermally enhanced, however, the temperature influence is based on CeO 2 content, the higher the CeO 2 amount, the higher the influence of temperature. The results of the nanocomposites revealed antibacterial activity counter to gram-positive bacteria strain (S. aureus, and B. subtilis), and gram-negative bacteria (E. coli, and K. pneumoniae), yeast (C. albicans, as well as fungi (A. niger). Inherently, the change in CeO 2 concentration from 0.01 to 0.1 wt% delivers maximum influence against gram-negative bacteria. These PMMA CeO 2-doped composites are beneficial for optoelectronic areas and devices. The research is evolving rapidly to provide enhanced life conditions regarding the industrial and biomedical areas for numerous aspects. Nanotechnology and related nanoscale composites promote versatile characteristics that could not be accomplished for their counterpart coarse grains. The conjugation of polymers and inorganic 0D-3D nanoparticles in the nanocomposite structure offers a desirable set of physical and chemical merits based on their confinement size. Likewise, this conjugation paves the route for varied optimization in the optical, electrical, thermal, and biomedical specifications 1. Nanocomposites explicitly engineered for several biomedical applications are regularly stated as "biomedical nanocomposites". There exists a multitude of probable biomedical nanocomposites, which can be characterized into many interconnected classifications. The foremost biological practices for these biomedical nanocomposites encompass the delivery of drugs, wound dressings, antibacterial assets, tissue engineering, stem cell remedy, cancer treatment, cardiac prosthesis, peripheral organs, biosensors, artificial blood vessels, as well as enzyme immobilization 2. Polymethyl methacrylate (PMMA) is an amorphous polymer material that provides significant specifications due to its high transparency, increased mechanical properties, environmental safety, reduced cost, and feasible
Iranian Journal of Science
Scientific Reports, Jun 14, 2022
This article investigates the effect of Ni 2+ content on structural (XRD, XPS), morphological (TE... more This article investigates the effect of Ni 2+ content on structural (XRD, XPS), morphological (TEM), and magnetic behaviors of silica magnesium zirconium copper nanoceramics calcined at 800 °C. The solgel route is followed for the silica magnesium zirconium copper/(0.0-0.7) Ni 2+ samples preparation. X-ray photoelectron spectroscopy is employed to analyze the chemical states of elements for the samples. The three representative binding energy magnitudes for O, Ni, and Cu reside at 534, 857, and 979 eV, consecutively. The saturation magnetization constricts with the elevation of Ni 2+ content, while the magnetic hysteresis loop resembles the superparamagnetic attitude. The optical spectra present the possibility of direct and indirect transitions in the prepared nanoceramics. Energy gap (value and type), refractive index, and real and imaginary dielectric constant were extracted. The energy gap approaches 3.75 eV and 3.71 eV for direct and indirect transitions correspondingly with (0.7) Ni 2+. The antimicrobial and the toxicity performance of all inspected nanocomposites were conducted against pathogenic microbes. The attained results evidenced that SMZC-0.7Ni possesses energetic antimicrobial potential against all targeted microbes. The investigated SMZC-0.7Ni nanocomposite functioned to eradicate frequent waterborne pathogens in wastewater at an appropriate dose (100 mg/L), demonstrating that SMZC can be utilized as a competent disinfectant in the municipal wastewater decontamination process. Inherently, SMZC-0.7Ni can be employed as an excellent nano-weapon against multiple dangerous microorganisms. Water is amongst the necessities of human civilization and other life forms in the universe, as it is utilized in various daily activities. Industrial development significantly contributes to the creation of sewage, which is often dumped untreated into bodies of water, resulting in pollution 1. Due to rising costs of freshwater resources, increasing population, and a range of climatic and environmental challenges, it is estimated that over 1.1 M people have no access to an appropriate water supply 2. Likewise, pathogenic microbes encompassing bacteria, viruses, fungi, protozoa, and rickettsia, trigger 80% of the total illnesses in underdeveloped countries, representing a severe hazard to public health and claiming millions of lives each year around the world 3. The management of wastewater could be a dormant solution to pollution reduction; yet, typical treatment procedures are insufficient to eliminate new pollutants and meet stringent water quality criteria entirely. The chlorination process is employed to inactivate pathogenic microorganisms in wastewater treatment plant effluents (WWTPs) before the point of discharge. Chlorination and ultraviolet (UV) irradiation are the most frequently applied disinfecting techniques 4. Nevertheless, the difficulties these two approaches encounter, such as the
Physica Scripta
In this work, the structural, optical, ligand field, and antibacterial properties of Cr2O3, ZnO a... more In this work, the structural, optical, ligand field, and antibacterial properties of Cr2O3, ZnO and Na2O borosilicate glasses were studied. A glass system of the compositions 70B2O3−14.8 SiO2-(15-x)Na2O-0.2Cr2O3-xZnO, where x = 0, 3, 5 and 7 mol% was prepared via melt-quenching technique. In this study, X-ray diffraction (XRD) spectra were used to check the amorphous state of the prepared glass specimens. Infrared (IR) spectra were used to study the internal structure of the formed units and groups within the glass matrix. Moreover, the optical absorbance spectra were used to study the optical parameters, such as optical band gap and ligand field parameters. Furthermore, the antibacterial activities of the glass samples were investigated against different antibiofilm activities, for example, Staphylococcus aureus and Escherichia coli. The optical studies showed that Eg values increased from 3.06 to 3.62 with further ZnO doping. Furthermore, 10 Dq values increased and B values decrea...
Journal of Materials Science: Materials in Electronics
Journal of Nanoparticle Research
Water treatment applications are in high demand recently. In this work, the titania nanotube (TNT... more Water treatment applications are in high demand recently. In this work, the titania nanotube (TNT) was successfully grown onto the outer surface of the carbon nanotubes (CNTs) via the hydrothermal method. The resultant prepared composite was doped with different ratios of nitrogen. The structural and morphological merits of the composites displayed the successful composition of the matrices, as well as the particle size of the composite within the nanoscale. The optical specifications of the composites demonstrate successful direct and indirect transitions with a high energy gap (> 3 eV). The testing of different oils in the water/oil separation exhibited a high rate of success to split oil and water (> 95%). In this regard, CNT-TNT 1.0 sample reflects the highest efficiency. Compared to other researchers that demonstrate the highest efficiency of their proposed structure, our membrane offers a decent separation efficiency. The proposed composite might provide a feasible and c...
Materials Today Communications
Micro and Nano Engineering
Journal of Materials Science: Materials in Electronics
The uprising era of technological applications seeks solutions that facilitate daily life activit... more The uprising era of technological applications seeks solutions that facilitate daily life activities. Sensors with their different types provide fast and reliable information. The employment of graphene oxide in these sensors complies with the general requirement for sensor's functionalization and easily achieves the purpose for which the sensor was prepared. In this report, we have synthesized rGO/SnO2/Co3O4 composite with a star-like structure through a facile chemical route. The mentioned structure was employed as a temperature sensor within a temperature range of 25–125 °C and a wide span of relative humidity values. In order to assess the quality of preparation and the sensing ability, the composite was inspected by the following techniques: XRD, FTIR, SEM, and thermal analysis in addition to the sensing measurements. The XRD results affirmed the successful incorporation of the SnO2/Co3O4 onto the rGO with 18 nm average crystallite size. The SEM results revealed the charact...
Emergent Materials
Magnetic Co (0.8-x) Zr x Na 0.2 Fe 2 O 4 nanocomposites (NCs) with controlled size were successfu... more Magnetic Co (0.8-x) Zr x Na 0.2 Fe 2 O 4 nanocomposites (NCs) with controlled size were successfully synthesized by a facile low-temperature sol–gel method. The morphological and chemical properties of Co (0.8-x) Zr x Na 0.2 Fe 2 O 4 NCs were controlled by (0.1–0.4) Zr content and particle size have been analyzed. The X-ray photoelectron spectroscopy (XPS) confirmed the chemical states for magnetic nanocomposites. Moderate saturation and coercivity (~ 200–500 Oe) of the nanocomposites remark the plausible soft magnetic behavior with adjustable factors. Here, glassy carbon electrode (GCE) was covered by a thin film of the prepared Co (0.8-x) Zr x Na 0.2 Fe 2 O 4 NCs, and 5% Nafion in ethanol was applied on the glassy carbon electrode (GCE) to obtain the desired 4-aminophenol (4-AP) sensor and was applied to electrochemical analysis in detail in the phosphate buffer (pH = 7.0). A plot of current versus concentration of 4-AP is found linear in the concentration of 0.1 nM ~ 0.01 mM labeled as the dynamic range (LDR) for the detection and the resulting plot is known as calibration curve. The slope of the calibration curve divided by a cross-section of GCE (0.0316 cm 2 ) results in the sensitivity (10.5665 µA µM −1 cm −2 ) of the 4-AP sensor. Using the signal-to-noise ratio (S/N ~ 3), the lower limit of detection (98.45 ± 4.92 pM) of the sensor is calculated. The 4-AP sensor exhibited substantial characteristics in terms of analytical parameters concluding response time, sensitivity, reproducibility, response time, and long-term stability in phosphate buffer. It is also evaluated in the detection of 4-AP with Co 0.4 Zr 0.4 Na 0.2 Fe 2 O 4 NCs/GCE sensor in real environmental and extracted samples by applying the electrochemical approach. For environmental toxin monitoring, this noble approach might be potential in the development of future sensor technology with doped nanocomposite material by electrochemical approach on a broad scale.
Diamond and Related Materials
The Electrochemical Society, Dec 20, 2021
Environmental Nanotechnology, Monitoring & Management, 2022
Egyptian Journal of Chemistry, 2021
Materials Science and Engineering: B, 2021
Abstract Among the most dangerous concerns for public health is a nosocomial bacterial infection ... more Abstract Among the most dangerous concerns for public health is a nosocomial bacterial infection of burn wounds. Nanocomposites with strong antibacterial activity have developed as a feasible candidate for these potential infects. Nix/SiO2 co-doped NiAl(1-x)CoFe2O4 nanocrystallites (sampled S0-S3) were prepared through the sol–gel method and calcined at 650 °C. Direct and/or indirect transition can be experienced in the prepared nanocrystallites with increased probability of direct type. Both the direct and indirect transition energy increase with Ni content increase. Further, the antibacterial activity against four nosocomial pathogens was evaluated through analysis of zone of inhibition, minimum inhibitory concentration (MIC), and some physiological changes. The S3 nanocomposites revealed excellent antibacterial activity against all studied nosocomial strains. Besides, it prevents bacterial growth and releases massive amounts of bacterial proteins compared to the others. Results demonstrated that it can fight nosocomial pathogens, especially those that infect the wounds and delay wound healing.
Silicon, 2021
Nano-sized nickel magnesium copper zircon silicate (1MgO: 2CuO: 4SiO2: 2.3ZrO2:0.7 NiO) nanocompo... more Nano-sized nickel magnesium copper zircon silicate (1MgO: 2CuO: 4SiO2: 2.3ZrO2:0.7 NiO) nanocomposite was prepared using sol-gel alkoxide precursors and calcined at 700 °C. The characterization for the prepared nano-sized by various analytical techniques confirmed the biphasic nature with the tetragonal zirconium silicate (ZrSiO4) dominant phase and a homogeneous inter-dispersion for the obtained nanocrystallites. The UV-Vis optical analysis in the range of 200–2500 nm was operated to check the optical energy gap (Eg), optical constants (n and k), optical density (OD), skin depth (δ), optical conductivity (σ), and the optical electronegativity (η) of the 1MgO: 2CuO: 4SiO2: 2.3 ZrO2:0.7 NiOnanocomposite. The magnetic behavior for the nanocomposite sample was investigated. The antibacterial potential of 1MgO: 2CuO: 4SiO2: 2.3 ZrO2:0.7 NiOagainst four foodborne bacterial pathogens was appraised. Results revealed that the inhibitory consequences of tested 1MgO: 2CuO: 4SiO2: 2.3 ZrO2:0.7 NiO were greater in Gram-negative species than Gram-positive species. Results unveiled that the toxicity assay of the tested nanocomposite is biocompatible and safe for food security application. Thus, the prepared1MgO: 2CuO: 4SiO2: 2.3 ZrO2:0.7 NiOis recommended to be applied in food packaging and processing due to their high thermal stability, biocompatible and potent antimicrobial agents, and can suppress the dissemination of foodborne pathogens during food manufacturing.
Applied Surface Science, 2021
Applied Physics A, 2021
The current study reveals the robust and facile microwave-assisted synthesis of graphene oxide–ca... more The current study reveals the robust and facile microwave-assisted synthesis of graphene oxide–carbon nanotubes–manganese oxide ternary hybrids (GO-CNTs-MnO2). The structural, magnetic, and morphological specifications of the as-prepared samples were explored and studied via versatile apparatus. The results reveal the diminish of D and G bands which corresponds to the existence of a thick layer of MnO2 that covers both CNTs and GO sheets entirely where no Raman signals for the carbon materials are noticed. X-ray diffraction (XRD) results demonstrate the limited crystallinity degree of the combinations. The scanning electron micrscope (SEM) results display the formation of The present CNTs-GO-MnO2 with an average diameter of 90 nm for the CNTs. Magnetic specifications of different combinations demonstrate that the combination of CNTs with GO reduces the saturation values to 0.5 emu/g where both approach saturation at relatively low fields around 5 kG deprived of any noteworthy change in the coercivity value. These hybrids demonstrate possibilities for enhanced magnetic and structural specifications for the benefit of the applied physics sector such as renewable energy storage, supercapacitors, and sensing applications.
Polymer bulletin, Jun 13, 2024
Scientific reports, Jan 31, 2024
In the current report, we have successfully synthesized nanocomposites of PMMA incorporating diff... more In the current report, we have successfully synthesized nanocomposites of PMMA incorporating different doping of CeO 2 through a chemical approach. XRD results reflects decent matching for CeO 2 nanoparticles with 29 nm crystallite size. FTIR spectroscopy demonstrates the characteristic functional groups validating the successful formation of the composite. The optical study of PMMA and the nanocomposites has proven that the optical properties such as band gap, refractive index, optical permittivity, and loss tangent factor are affected by adding CeO 2 to the PMMA matrix.The peak residing around 420 nm by UV measurements is allocated to occurring electrons photoexcitation from the valence to conduction band inherent in CeO 2. The dielectric measurements were achieved using broadband dielectric spectroscopy upon a wide span of frequencies (10-1-10 7 Hz) and within temperatures from − 10 to 80 °C with a step of 10 °C. The permittivity decreases by adding CeO 2 and the dielectric parameters are thermally enhanced, however, the temperature influence is based on CeO 2 content, the higher the CeO 2 amount, the higher the influence of temperature. The results of the nanocomposites revealed antibacterial activity counter to gram-positive bacteria strain (S. aureus, and B. subtilis), and gram-negative bacteria (E. coli, and K. pneumoniae), yeast (C. albicans, as well as fungi (A. niger). Inherently, the change in CeO 2 concentration from 0.01 to 0.1 wt% delivers maximum influence against gram-negative bacteria. These PMMA CeO 2-doped composites are beneficial for optoelectronic areas and devices. The research is evolving rapidly to provide enhanced life conditions regarding the industrial and biomedical areas for numerous aspects. Nanotechnology and related nanoscale composites promote versatile characteristics that could not be accomplished for their counterpart coarse grains. The conjugation of polymers and inorganic 0D-3D nanoparticles in the nanocomposite structure offers a desirable set of physical and chemical merits based on their confinement size. Likewise, this conjugation paves the route for varied optimization in the optical, electrical, thermal, and biomedical specifications 1. Nanocomposites explicitly engineered for several biomedical applications are regularly stated as "biomedical nanocomposites". There exists a multitude of probable biomedical nanocomposites, which can be characterized into many interconnected classifications. The foremost biological practices for these biomedical nanocomposites encompass the delivery of drugs, wound dressings, antibacterial assets, tissue engineering, stem cell remedy, cancer treatment, cardiac prosthesis, peripheral organs, biosensors, artificial blood vessels, as well as enzyme immobilization 2. Polymethyl methacrylate (PMMA) is an amorphous polymer material that provides significant specifications due to its high transparency, increased mechanical properties, environmental safety, reduced cost, and feasible
Iranian Journal of Science
Scientific Reports, Jun 14, 2022
This article investigates the effect of Ni 2+ content on structural (XRD, XPS), morphological (TE... more This article investigates the effect of Ni 2+ content on structural (XRD, XPS), morphological (TEM), and magnetic behaviors of silica magnesium zirconium copper nanoceramics calcined at 800 °C. The solgel route is followed for the silica magnesium zirconium copper/(0.0-0.7) Ni 2+ samples preparation. X-ray photoelectron spectroscopy is employed to analyze the chemical states of elements for the samples. The three representative binding energy magnitudes for O, Ni, and Cu reside at 534, 857, and 979 eV, consecutively. The saturation magnetization constricts with the elevation of Ni 2+ content, while the magnetic hysteresis loop resembles the superparamagnetic attitude. The optical spectra present the possibility of direct and indirect transitions in the prepared nanoceramics. Energy gap (value and type), refractive index, and real and imaginary dielectric constant were extracted. The energy gap approaches 3.75 eV and 3.71 eV for direct and indirect transitions correspondingly with (0.7) Ni 2+. The antimicrobial and the toxicity performance of all inspected nanocomposites were conducted against pathogenic microbes. The attained results evidenced that SMZC-0.7Ni possesses energetic antimicrobial potential against all targeted microbes. The investigated SMZC-0.7Ni nanocomposite functioned to eradicate frequent waterborne pathogens in wastewater at an appropriate dose (100 mg/L), demonstrating that SMZC can be utilized as a competent disinfectant in the municipal wastewater decontamination process. Inherently, SMZC-0.7Ni can be employed as an excellent nano-weapon against multiple dangerous microorganisms. Water is amongst the necessities of human civilization and other life forms in the universe, as it is utilized in various daily activities. Industrial development significantly contributes to the creation of sewage, which is often dumped untreated into bodies of water, resulting in pollution 1. Due to rising costs of freshwater resources, increasing population, and a range of climatic and environmental challenges, it is estimated that over 1.1 M people have no access to an appropriate water supply 2. Likewise, pathogenic microbes encompassing bacteria, viruses, fungi, protozoa, and rickettsia, trigger 80% of the total illnesses in underdeveloped countries, representing a severe hazard to public health and claiming millions of lives each year around the world 3. The management of wastewater could be a dormant solution to pollution reduction; yet, typical treatment procedures are insufficient to eliminate new pollutants and meet stringent water quality criteria entirely. The chlorination process is employed to inactivate pathogenic microorganisms in wastewater treatment plant effluents (WWTPs) before the point of discharge. Chlorination and ultraviolet (UV) irradiation are the most frequently applied disinfecting techniques 4. Nevertheless, the difficulties these two approaches encounter, such as the
Physica Scripta
In this work, the structural, optical, ligand field, and antibacterial properties of Cr2O3, ZnO a... more In this work, the structural, optical, ligand field, and antibacterial properties of Cr2O3, ZnO and Na2O borosilicate glasses were studied. A glass system of the compositions 70B2O3−14.8 SiO2-(15-x)Na2O-0.2Cr2O3-xZnO, where x = 0, 3, 5 and 7 mol% was prepared via melt-quenching technique. In this study, X-ray diffraction (XRD) spectra were used to check the amorphous state of the prepared glass specimens. Infrared (IR) spectra were used to study the internal structure of the formed units and groups within the glass matrix. Moreover, the optical absorbance spectra were used to study the optical parameters, such as optical band gap and ligand field parameters. Furthermore, the antibacterial activities of the glass samples were investigated against different antibiofilm activities, for example, Staphylococcus aureus and Escherichia coli. The optical studies showed that Eg values increased from 3.06 to 3.62 with further ZnO doping. Furthermore, 10 Dq values increased and B values decrea...
Journal of Materials Science: Materials in Electronics
Journal of Nanoparticle Research
Water treatment applications are in high demand recently. In this work, the titania nanotube (TNT... more Water treatment applications are in high demand recently. In this work, the titania nanotube (TNT) was successfully grown onto the outer surface of the carbon nanotubes (CNTs) via the hydrothermal method. The resultant prepared composite was doped with different ratios of nitrogen. The structural and morphological merits of the composites displayed the successful composition of the matrices, as well as the particle size of the composite within the nanoscale. The optical specifications of the composites demonstrate successful direct and indirect transitions with a high energy gap (> 3 eV). The testing of different oils in the water/oil separation exhibited a high rate of success to split oil and water (> 95%). In this regard, CNT-TNT 1.0 sample reflects the highest efficiency. Compared to other researchers that demonstrate the highest efficiency of their proposed structure, our membrane offers a decent separation efficiency. The proposed composite might provide a feasible and c...
Materials Today Communications
Micro and Nano Engineering
Journal of Materials Science: Materials in Electronics
The uprising era of technological applications seeks solutions that facilitate daily life activit... more The uprising era of technological applications seeks solutions that facilitate daily life activities. Sensors with their different types provide fast and reliable information. The employment of graphene oxide in these sensors complies with the general requirement for sensor's functionalization and easily achieves the purpose for which the sensor was prepared. In this report, we have synthesized rGO/SnO2/Co3O4 composite with a star-like structure through a facile chemical route. The mentioned structure was employed as a temperature sensor within a temperature range of 25–125 °C and a wide span of relative humidity values. In order to assess the quality of preparation and the sensing ability, the composite was inspected by the following techniques: XRD, FTIR, SEM, and thermal analysis in addition to the sensing measurements. The XRD results affirmed the successful incorporation of the SnO2/Co3O4 onto the rGO with 18 nm average crystallite size. The SEM results revealed the charact...
Emergent Materials
Magnetic Co (0.8-x) Zr x Na 0.2 Fe 2 O 4 nanocomposites (NCs) with controlled size were successfu... more Magnetic Co (0.8-x) Zr x Na 0.2 Fe 2 O 4 nanocomposites (NCs) with controlled size were successfully synthesized by a facile low-temperature sol–gel method. The morphological and chemical properties of Co (0.8-x) Zr x Na 0.2 Fe 2 O 4 NCs were controlled by (0.1–0.4) Zr content and particle size have been analyzed. The X-ray photoelectron spectroscopy (XPS) confirmed the chemical states for magnetic nanocomposites. Moderate saturation and coercivity (~ 200–500 Oe) of the nanocomposites remark the plausible soft magnetic behavior with adjustable factors. Here, glassy carbon electrode (GCE) was covered by a thin film of the prepared Co (0.8-x) Zr x Na 0.2 Fe 2 O 4 NCs, and 5% Nafion in ethanol was applied on the glassy carbon electrode (GCE) to obtain the desired 4-aminophenol (4-AP) sensor and was applied to electrochemical analysis in detail in the phosphate buffer (pH = 7.0). A plot of current versus concentration of 4-AP is found linear in the concentration of 0.1 nM ~ 0.01 mM labeled as the dynamic range (LDR) for the detection and the resulting plot is known as calibration curve. The slope of the calibration curve divided by a cross-section of GCE (0.0316 cm 2 ) results in the sensitivity (10.5665 µA µM −1 cm −2 ) of the 4-AP sensor. Using the signal-to-noise ratio (S/N ~ 3), the lower limit of detection (98.45 ± 4.92 pM) of the sensor is calculated. The 4-AP sensor exhibited substantial characteristics in terms of analytical parameters concluding response time, sensitivity, reproducibility, response time, and long-term stability in phosphate buffer. It is also evaluated in the detection of 4-AP with Co 0.4 Zr 0.4 Na 0.2 Fe 2 O 4 NCs/GCE sensor in real environmental and extracted samples by applying the electrochemical approach. For environmental toxin monitoring, this noble approach might be potential in the development of future sensor technology with doped nanocomposite material by electrochemical approach on a broad scale.
Diamond and Related Materials
The Electrochemical Society, Dec 20, 2021
Environmental Nanotechnology, Monitoring & Management, 2022
Egyptian Journal of Chemistry, 2021
Materials Science and Engineering: B, 2021
Abstract Among the most dangerous concerns for public health is a nosocomial bacterial infection ... more Abstract Among the most dangerous concerns for public health is a nosocomial bacterial infection of burn wounds. Nanocomposites with strong antibacterial activity have developed as a feasible candidate for these potential infects. Nix/SiO2 co-doped NiAl(1-x)CoFe2O4 nanocrystallites (sampled S0-S3) were prepared through the sol–gel method and calcined at 650 °C. Direct and/or indirect transition can be experienced in the prepared nanocrystallites with increased probability of direct type. Both the direct and indirect transition energy increase with Ni content increase. Further, the antibacterial activity against four nosocomial pathogens was evaluated through analysis of zone of inhibition, minimum inhibitory concentration (MIC), and some physiological changes. The S3 nanocomposites revealed excellent antibacterial activity against all studied nosocomial strains. Besides, it prevents bacterial growth and releases massive amounts of bacterial proteins compared to the others. Results demonstrated that it can fight nosocomial pathogens, especially those that infect the wounds and delay wound healing.
Silicon, 2021
Nano-sized nickel magnesium copper zircon silicate (1MgO: 2CuO: 4SiO2: 2.3ZrO2:0.7 NiO) nanocompo... more Nano-sized nickel magnesium copper zircon silicate (1MgO: 2CuO: 4SiO2: 2.3ZrO2:0.7 NiO) nanocomposite was prepared using sol-gel alkoxide precursors and calcined at 700 °C. The characterization for the prepared nano-sized by various analytical techniques confirmed the biphasic nature with the tetragonal zirconium silicate (ZrSiO4) dominant phase and a homogeneous inter-dispersion for the obtained nanocrystallites. The UV-Vis optical analysis in the range of 200–2500 nm was operated to check the optical energy gap (Eg), optical constants (n and k), optical density (OD), skin depth (δ), optical conductivity (σ), and the optical electronegativity (η) of the 1MgO: 2CuO: 4SiO2: 2.3 ZrO2:0.7 NiOnanocomposite. The magnetic behavior for the nanocomposite sample was investigated. The antibacterial potential of 1MgO: 2CuO: 4SiO2: 2.3 ZrO2:0.7 NiOagainst four foodborne bacterial pathogens was appraised. Results revealed that the inhibitory consequences of tested 1MgO: 2CuO: 4SiO2: 2.3 ZrO2:0.7 NiO were greater in Gram-negative species than Gram-positive species. Results unveiled that the toxicity assay of the tested nanocomposite is biocompatible and safe for food security application. Thus, the prepared1MgO: 2CuO: 4SiO2: 2.3 ZrO2:0.7 NiOis recommended to be applied in food packaging and processing due to their high thermal stability, biocompatible and potent antimicrobial agents, and can suppress the dissemination of foodborne pathogens during food manufacturing.
Applied Surface Science, 2021
Applied Physics A, 2021
The current study reveals the robust and facile microwave-assisted synthesis of graphene oxide–ca... more The current study reveals the robust and facile microwave-assisted synthesis of graphene oxide–carbon nanotubes–manganese oxide ternary hybrids (GO-CNTs-MnO2). The structural, magnetic, and morphological specifications of the as-prepared samples were explored and studied via versatile apparatus. The results reveal the diminish of D and G bands which corresponds to the existence of a thick layer of MnO2 that covers both CNTs and GO sheets entirely where no Raman signals for the carbon materials are noticed. X-ray diffraction (XRD) results demonstrate the limited crystallinity degree of the combinations. The scanning electron micrscope (SEM) results display the formation of The present CNTs-GO-MnO2 with an average diameter of 90 nm for the CNTs. Magnetic specifications of different combinations demonstrate that the combination of CNTs with GO reduces the saturation values to 0.5 emu/g where both approach saturation at relatively low fields around 5 kG deprived of any noteworthy change in the coercivity value. These hybrids demonstrate possibilities for enhanced magnetic and structural specifications for the benefit of the applied physics sector such as renewable energy storage, supercapacitors, and sensing applications.