Spectroscopy Department / Physics Division
National Research Centre
A.M. Abdelghany, H.A. El-Batal, F.M. EzzEl-Din, N. ElAlialy, A. Okasha, D. Atta, A.M. Ismail, M. Abdelbaky, M.A. Aboelwafa, and W. Awad Elsevier BV
E. Elesh, Kareem T. Abul-Nasr, A.M. Abdelghany, and D.G. El- Damhogi Elsevier BV
Monira G. Ghoniem, Fatima A. Adam, Babiker Y. Abdulkhair, A. M. Abdelghany, and Elkenany B. Elkenany Springer Science and Business Media LLC
Ashraf Abou ElReash, Mohamed Grawish, Walied Abdo, Amr M. Abdelghany, Luo Junsi, Xie Xiaoli, and Hamdi Hamama Springer Science and Business Media LLC
AbstractThis comparative study was conducted to assess the intramedullary bone tissue reaction of an ion-releasing resin modified glass-ionomer cement with claimed bioactivity (ACTIVA bioactive resin) restorative material versus Mineral Trioxide Aggregate High Plasticity (MTA HP) and bioceramic putty iRoot BP Plus. Fifty-six adult male Wistar rats were assigned into 4 equal groups (14 rats each). A surgical intramedullary bi-lateral tibial bone defects were performed in rats of the control group I (GI) and left without any treatment to be considered as controls (n = 28). The rats of groups II, III and IV were handled as group I except that the tibial bone defects were filled with ACTIVA, MTA HP and iRoot BP, respectively. In all groups, rats were euthanized after one month and specimens were processed to histological investigation, SEM examination and EDX elemental analysis. In addition, semi-quantitative histomorphometric scoring system was conducted for the following parameters; new bone formation, inflammatory response, angiogenesis, granulation tissue, osteoblasts and osteoclasts. The clinical follow-up outcome of this study revealed the recovery of rats after 4 days post-surgical procedure. It was observed that the animal subjects returned to their routine activities, e.g., walking, grooming and eating. The rats showed normal chewing efficiency without any weight loss or postoperative complications. Histologically, the control group sections showed scanty, very thin, new bone trabeculae of immature woven type located mostly at the peripheral part of the tibial bone defects. These defects exhibited greater amount of thick bands of typically organized granulation tissue with central and peripheral orientation. Meanwhile, bone defects of ACTIVA group showed an empty space surrounded by thick, newly formed, immature woven bone trabeculae. Moreover, bone defects of MTA HP group were partially filled with thick newly formed woven bone trabeculae with wide marrow spaces presented centrally and at the periphery with little amount of mature granulation tissue at the central part. The iRoot BP Plus group section exhibited an observable woven bone formation of normal trabecular structures with narrow marrow spaces presented centrally and at the periphery showed lesser amount of well-organized/mature granulation tissue formation. Kruskal Wallis test revealed total significant differences between the control, ACTIVA, MTAHP and iRoot BP Plus groups (p < 0.05). Meanwhile, Mann–Whitney U test showed significant difference between control and ACTIVA groups, Control and MTA HP groups, control and iRoot BP Plus groups. ACTIVA and MTA HP groups, ACTIVA and iRoot BP Plus (p ˂ 0.05) with no significant difference between MTA HP and iRoot BP Plus (p > 0.05). The elemental analysis outcome showed that the lesions of the control group specimens were filled with recently created trabecular bone with limited marrow spaces. EDX tests (Ca and P analysis) indicated a lower degree of mineralization. Lower amounts of Ca and P was expressed in the mapping analysis compared with other test groups. Calcium silicate-based cements induce more bone formation when compared to an ion-releasing resin modified glass-ionomer restoration with claimed bioactivity. Moreover, the bio-inductive properties of the three tested materials are likely the same. Clinical significance: bioactive resin composite can be used as a retrograde filling.
M. Abdelbaky, A. M. Abdelghany, A. H. Oraby, E. M. Abdelrazek, and M. M. Rashad Springer Science and Business Media LLC
AbstractThe photo-Fenton process is an appropriate method of the Advanced Oxidation Process that is used in the photocatalysis of organic dyes like crystal violet (CV). La3+ ion substituted gadolinium zirconium oxide Gd(2−x)La(x)Zr2O7 nanopowders (x = 0.1, 0.2, 0.3, and 0.5) have been successfully prepared by using sol–gel auto-combustion method to be used for the efficient photocatalysis of CV with photo-Fenton process. The well-crystallized defect-fluorite, structured with space group: Fm-3m, was detected using X-ray diffraction analysis. The lattice parameters were found to increase with the evaluated La3+ ion concentration. The grain size of the synthesized powders increased with the increase in La3+ ion content. The SAED patterns depicted fluorite structured fluorite. UV/Vis. spectrophotometer was used for the determination of band gap energy of Gd(2−x)La(x)Zr2O7 nanopowders which increased with increasing La3+ ion content. It was found to enhance from 4 to 3.6 eV. The visible spectrophotometer was used for determining unknown concentrations during the photocatalysis process to assure the effectiveness of the process. Overall, results illustrate that the photo-Fenton reaction on Gd(2−x)La(x)Zr2O7 performed excellently in removing crystal violet (CV). The photo-remediation ratio of CV reached 90% within 1 h.
Ahmed R. Ghazy, B. M. Elmowafy, A. M. Abdelghany, T. M. Meaz, R. Ghazy, and R. M. Ramadan Springer Science and Business Media LLC
AbstractBorate glasses (BG) doped with different amounts of ZnO (0–0.6 mol%) were formed by the traditional melt quenching technique. The different glasses so made were characterized using different characterization techniques such as X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), and UV–Vis absorption optical properties. The XRD patterns showed an amorphous structure with one broad peak at 2θ = 29°, while the phonons bands were studied in terms of the FTIR bands. Optical properties of the glasses were studied using UV–Vis absorption spectra in the range 190–1100 nm, in which the prominent band lies at about 261.5 nm of peak position, from which the bandgab (Eg) was calculated from its edge using Tauc’s plot, with Eg ~ 3.5 eV. The laser irradiation showed no significant changes in the absorption bands, despite a significant change observed in the amorphous behavior in the XRD pattern. The cell viability was performed for two samples of the BG and 0.6 mol% ZnO doped using 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide (MTT) assay method. The result showed better cell viability and low toxicity. So, ZnO doped BG can be used in various biomedical applications.
A. M. Abdelghany, M. S. Meikhail, A. H. Oraby, and M. A. Aboelwafa Springer Science and Business Media LLC
AbstractChitosan/Polyvinyl pyrrolidone (CS/PVP) semi-natural polymeric blend involving gradient concentrations of ZnS nanoparticles (ZnS-NPS) was prepared via a simple casting method. In conjunction with computational density functional theory approaches (DFT), prepared samples were characterized by UV/Vis spectrophotometric studies and Fourier transform infrared measurements (FTIR) to take into account a detailed description of the different reaction mechanisms within the polymeric matrices. To conduct all calculations, the Becke three-parameter hybrid functional (B3LYP) correlation function used with the electron core potential basis set LANL2DZ was used. A detailed study of different reaction regimes was studied and reaction via Oxygen was observed to be preferred and compatible with that of the experimental data. UV/vis. Absorption experimental data were used to calculate the optical energy gap using the Mott-Davis equation and observed data was found to follow an indirect transition route.
M. A. Madshal, A. M. Abdelghany, Amal Behairy, and G. El-Damrawi Springer Science and Business Media LLC
Hanan Al-Ghamdi, Norah A. M. Alsaif, F. Afaneh, Z. Y. Khattari, A. M. Abdelghany, and Y. S. Rammah Springer Science and Business Media LLC
W. Awad, Hanan Al-Ghamdi, Norah A. M. Alsaif, Y. S. Rammah, A. M. Abdelghany, and G. O. Rabiea Springer Science and Business Media LLC
M.A. Madshal, A.M. Abdelghany, M.I. Abdelghany, and G. El-Damrawi Elsevier BV
M. Abdelbaky, A. M. Abdelghany, A. H. Oraby, E. M. Abdelrazek, and M. M. Rashad Springer Science and Business Media LLC
Abstract The demand for clean water free of pollution has become an urgent priority for humanity. Gd2Zr2O7 nanoparticles were successfully synthesized via sol–gel auto combustion as a type of pyrochlore to be used in the dye phytoremediation using a Fenton-like approach. Gd2Zr2O7 nanoparticles have been successfully prepared using a sol–gel auto-combustion strategy. The annealing process was performed in a furnace at 1100 °C for 2 h to form defect-fluorite structured Gd2Zr2O7 with space group Fm-3m. XRD analysis revealed that synthesized Gd2Zr2O7 nanoparticles were found to have crystallite sizes with lattice parameters of 28.5 nm and 10.524 + 0.02 Å, respectively. TEM micrographs showed the presence of a cubic-like structure with a size of about 17 nm. The band gap energy of the synthesized powders was found to be 3.8 eV relating to the impact of the crystallite size. The generated nanoparticles finally show a significant photo Fenton catalytic activity with an efficiency of 90% for the photocatalysis of crystal violet dye after 60 min. It was determined that the substantial absorption of Gd2Zr2O7 in the visible-light region, which was synergistically activated by both Gd3+ and Zr4+ ions, was the cause of the large surface area of the scattered microstructure and reactive OH. formation.
I. S. Elashmawi, A. M. Ismail, and A. M. Abdelghany Springer Science and Business Media LLC
AbstractUsing the solution casting method, a blend of polyvinyl alcohol/chitosan (PVA/Cs) blend was prepared with different amounts of polypyrrole (PPy) to enhance the structural and electrical conductivity of the films. The miscibility and interaction between PVA/Cs were confirmed by FT-IR measurements by shifting and disappearing some bands suggesting that the PVA functional group interacted with every other functional group on the Cs side chain. For PVA/Cs/PPy, some band intensities varied, indicating the interaction between PPy and PVA/Cs. XRD showed that the addition of PPy to the blend leads to a noticeable decrease in the intensity of the diffraction peak at 2θ = 20.0° confirming the interactions have occurred between the PVA/Cs mixture and PPy. The UV–visible spectra indicate that increasing the amounts of PPy leads to a dramatic decrease in the energy band gap and an increase in the Urbach energy due to the creation of new energy levels that emerged between conduction and valance bands. After PPy was introduced, the polaron and bipolaron transition peaks at 416, 465, and 560 nm become apparent in the PL spectrum. The dielectric and the electrical properties were reported. The values of ε′ and ε′′ were stronger at low frequencies confirming the possibilities of interface polarization processes. The tan δ behavior diagrams have exhibited one peak trend in all samples shift toward higher frequencies as the temperature and PPy rise. The presence of the peaks was explained based on the electrical conductivity mechanism and dielectric behavior. The Cole–Cole plot displays a half one semicircle shape that explains the absence of contact effects. This semicircle expands as both temperature and PPy increase.
M.A. Aboelwafa, M.S. Meikhail, A.H. Oraby, and A.M. abdelghany Elsevier BV
Z.Y. Khattari, Hanan Al-Ghamdi, Norah A.M. Alsaif, Y.S. Rammah, and A.M. Abdelghany Elsevier BV
A. Y. Yassin, A. M. Abdelghany, Reda S. Salama, and A. E. Tarabiah Springer Science and Business Media LLC
AbstractIn this work, zinc oxide (ZnO) was produced using extracts of Thymus (Z), Hibiscus rosa-sinensis (K), and Daucus carota (G). Furthermore, sodium carboxymethyl cellulose (CMC) and polyvinyl alcohol (PVA) were combined with ZnO to form three novel nanocomposites. X-ray diffraction (XRD) was used for the structural analysis, where the semicrystalline nature of the (CMC/PVA)/ZnO nanocomposites was confirmed. The characteristics functional groups that arose inside the prepared samples were identified by Fourier transform infrared spectroscopy (FTIR). Evidence for the successful preparation of the pure ZnO particles and their nanocomposites was carried out using a transmission electron microscope (TEM). The ZnO nanoparticles are mostly spherical, irregularly distributed, and have radii ranging from 10 to 40 nm. Their anti-bacterial activity was studied against B. subtilis, E. coli, and Candida albicans. The inhibition zones of all the prepared samples against E. coli were 0, 19, 31, and 23 mm for PVA/CMC blend, PVA/CMC/ZnO (Z) (PCZ-Z), PVA/CMC/ZnO (K) (PCZ-K), and PVA/CMC/ZnO (G) (PCZ-G), respectively, compared to the streptomycin control Gram-positive standard with inhibition zone (34 mm). On the other hand, the inhibition zones of the prepared samples against B. subtilis were equal to 0, 26, 33, and 28 mm for CMC/PVA, PCZ-Z, PCZ-K, and PCZ-G, respectively. Based on these results, the PCZ-K sample is the most effective at resisting E. coli (91.17%) and B. subtilis (94.28%). These nanocomposites do not have harmful chemicals, making them strong candidates for use in biological applications.
A.M. Abdelghany, G.M. El-Damrawi, and E.G. Elbasuoni Elsevier BV
Wael I. Mortada, Kareem A. Nabieh, and Amr M. Abdelghany Springer Science and Business Media LLC
Abstract Water pollution results from rapid urbanization and industrialization which has harmful effects on human health. Adsorption is one of the most efficient processes to remove pollutants from contaminated water. Natural minerals, such as dolomite, are widely spread around the world and may be easily collected in huge quantities. In this work, dolomite was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) with energy dispersive X-ray analysis (EDX) and Fourier-transform infrared spectroscopy (FTIR), and was investigated for its applicability for removal of methylene blue (MB) from aqueous medium in a surfactant-assisted procedure. Using the one-factor one-time approach, batch adsorption studies were performed to establish the best experimental conditions (pH, sorbent amount, shaking time, type and concentration of surfactant and ionic strength) for removal of MB by dolomite. At optimum conditions (pH 8.0, shaking time 90 min, 1.0 g L−1 dolomite, 0.1% w/v sodium dodecyl sulfate, 25 °C), the maximum adsorption capacity was 22.2 mg g−1 and the adsorption process obeyed Langmuir and Freundlich adsorption isotherms. The findings show that dolomite effectively adsorbs MB and may be used as a less expensive sorbent in wastewater treatment to remove MB. Graphical Abstract
A.M. Abdelghany, Norah A.M. Alsaif, M.A. Madshal, H.A. ElBatal, Y.S. Rammah, and W. Awad Elsevier BV
Elmetwally M. Abdelrazek, Amr M. Abdelghany, Ahmed E. Tarabiah, and Ahmed L. Waly Springer Science and Business Media LLC
Shehab E. Ali, Dina M. El shobaky, Amr M. Abdelghany, and Yehia M. Abbas Elsevier BV
S. Al-Omari, Norah A. M. Alsaif, Z. Y. Khattari, Hanan Al-Ghamdi, A. M. Abdelghany, and Y. S. Rammah Springer Science and Business Media LLC
Norah A.M. Alsaif, Shaik Kareem Ahmmad, Z.Y. Khattari, A.M. Abdelghany, Adel M. El-Refaey, Y.S. Rammah, M.S. Shams, and R.A. Elsad Elsevier BV