Amr Mohamed Abdelghany
@nrc.sci.eg
Spectroscopy Department / Physics Division
National Research Centre
RESEARCH INTERESTS
Glass
Glass-Ceramics
Polymers
Biomaterials
nanotechnology
Scopus Publications
Scopus Publications
N. G. Imam, Messaoud Harfouche, A. M. Abdelghany, and Jan Ingo Flege
Springer Science and Business Media LLC
AbstractThis contribution investigates the effect of variable copper incorporation (x = 0.2, 1.0, 2.0, and 4.0) in silicate (45 SiO2, 24.5 CaO, 24.5 Na2O, 6P2O5wt%) and modified borate (45 B2O3, 24.5 CaO, 24.5 Na2O, 6P2O5wt%) bioglass materials to be used for bone bonding applications. X-ray absorption fine structure spectroscopy (XAFS) has been used to determine the oxidation states and local coordination structure of Cu atoms in silicate-based and borate-based glasses at the Cu K-edge (~ 8979 eV). The oxidation states of Cu atoms have been determined by near-edge XAFS (XANES) fingerprinting employing reference standard compounds of Cu. Cu (I) and Cu (II) XANES spectra of the standard reference compounds were linearly combined to fit the normalized μ(E) data of the collected XANES spectra using linear combination fitting (LCF approach). The obtained results prove that most of the silicate glass samples contain Cu2O almost exclusively, while modified borate glass samples contain a significant mixture of Cu2O and CuO phases. According to the literature, the remarkable coexistence of Cu2O and CuO phases within the borate sample, particularly when x = 4, promotes the conversion process to allow the more facile formation of hydroxy carbonate apatite (HCA). The best fit structural parameters derived from extended-XAFS (EXAFS) fitting show that the ratio between Cu (I) and Cu (II) in borate glass agreed well with that extracted from XANES analysis. XANES and EXAFS conclude that borate glass with x = 4 is the most suitable composition for bone bonding applications.
Sara Saad, Amr Mohamed Abdelghany, Ghada Samir Abou-ElWafa, Heshmat Soliman Aldesuquy, and Eladl Eltanahy
Springer Science and Business Media LLC
Abstract Background Beet filter cake (BFC) is a food-grade solid waste produced by the sugar industry, constituting a permanent source of pollution. Cyanobacteria are considered a sustainable resource for various bioactive compounds such as phycocyanin pigment with valuable applications. This study aimed to use beet filter cake extract (BFCE) as an alternative medium for the economic cultivation of cyanobacterium Leptolyngbya sp. SSI24 PP723083, then biorefined the bioactive component such as phycocyanin pigment that could be used in the production of selenium nanoparticles. Results The results of the batch experiment displayed that the highest protein content was in BG11medium (47.9%); however, the maximum carbohydrate and lipid content were in 25% BFCE (15.25 and 10.23%, respectively). In addition, 75% BFCE medium stimulated the phycocyanin content (25.29 mg/g) with an insignificant variation compared to BG11 (22.8 mg/g). Moreover, crude phycocyanin extract from Leptolyngbya sp SSI24 cultivated on BG11 and 75% BFCE successfully produced spherical-shaped selenium nanoparticles (Se-NPs) with mean sizes of 95 and 96 nm in both extracts, respectively. Moreover, XRD results demonstrated that the biosynthesized Se-NPs have a crystalline nature. In addition, the Zeta potential of the biosynthesized Se-NPs equals − 17 mV and − 15.03 mV in the control and 75% BFCE treatment, respectively, indicating their stability. The biosynthesized Se-NPs exhibited higher effectiveness against Gram-positive bacteria than Gram-negative bacteria. Moreover, the biosynthesized Se-NPs from BG11 had higher antioxidant activity with IC50 of 60 ± 0.7 compared to 75% BFCE medium. Further, Se-NPs biosynthesized from phycocyanin extracted from Leptolyngbya sp cultivated on 75% BFCE exhibited strong anticancer activity with IC50 of 17.31 ± 0.63 µg/ml against the human breast cancer cell line. Conclusions The BFCE-supplemented medium can be used for the cultivation of cyanobacterial strain for the phycocyanin accumulation that is used for the green synthesis of selenium nanoparticles that have biological applications. Graphical Abstract
Norah A. M. Alsaif, Nada Alfryyan, Hanan Al-Ghamdi, S. M. Kotb, S. Talaat, A. M. Abdelghany, Yasser S. Rammah, A. S. Abouhaswa, and M. S. Sadeq
Springer Science and Business Media LLC
Norah A.M. Alsaif, Nada Alfryyan, Hanan Al-Ghamdi, A.M. Abdelghany, Mohamed Tharwat, A.S. Abouhaswa, Islam M. Nabil, and Y.S. Rammah
Elsevier BV
Nada N. Al-Refaey, A. Abd El-Maboud, A. Abdelghany, and I. Kashif
Springer Science and Business Media LLC
AbstractThe samples were prepared in compliance with the form 33 Li2O–66 B2O3—(1-x) AgF—x Sm2O3, where x = 0, 0.25, 0.5, and 0.75. Powdered samples were converted to a glassy state via melting and quenching. The glassiness of the prepared samples was examined using X-ray diffraction (XRD) and Differential Thermal Analysis (DTA). From the absorption spectra of the prepared glass samples, the band gap in the optical spectrum changed slightly in the range of 3.45, whereas the Urbach energy decreased from 0.32 to 0.267 eV. The fluctuations of the optical band gap and Urbach energy can be attributed to variations in the glass structure. Sm3 + emitted intense reddish-orange light under blue and UV light excitation. There are six excitation bands in the Sm3+ excitation spectrum situated in the blue and UV regions, peaking at 361.7, 374, 400, 417, 462, and 475 nm, which are attributed to the transitions from 6H5/2 to 4D3/2, 6P7/2, 6P3/2, 6P5/2, 4I13/2, and 4I11/2 respectively. The transition from 6H5/2 to 6P3/2 had the highest intensity and was associated with a peak at 400 nm. The bright yellow, reddish-orange, and red emission bands of the Sm3+ ions in the oxide glasses are related to the 4G5/2 → 6H5/2, 4G5/2 → 6H7/2, and 4G5/2 → 6H9/2 emission transitions, respectively.
Hanan Al-Ghamdi, Norah A. M. Alsaif, Islam M. Nabil, A. M. Abdelghany, Y. S. Rammah, and A. S. Abouhaswa
Springer Science and Business Media LLC
Nuha Y. Elamin, Hanan Alhussain, Y. G. Abou El-Reash, A. M. Abdelghany, and M. Hamed Misbah
Springer Science and Business Media LLC
A.Y. Yassin, E.M. Abdelrazek, A.M. Abdelghany, and E.M. Abdallah
Elsevier BV
Hanan Al-Ghamdi, Nada Alfryyan, Norah A.M. Alsaif, M.S. Sadeq, A.M. Abdelghany, Y.S. Rammah, and A.S. Abouhaswa
Elsevier BV
Nada Alfryyan, Hanan Al-Ghamdi, Norah A. M. Alsaif, Islam M. Nabil, A. M. Abdelghany, A. S. Abouhaswa, and Y. S. Rammah
Springer Science and Business Media LLC
D. Atta, A.M. Abdelghany, and W.M. Awad
Elsevier BV
Hanan Al-Ghamdi, Norah A. M. Alsaif, Shaik Kareem Ahmmad, M. M. Ahmed, M. S. Shams, Adel M. El-Refaey, A. M. Abdelghany, Shaaban M. Shaaban, Y. S. Rammah, and R. A. Elsad
Springer Science and Business Media LLC
A.M. Abdelghany, Nuha Y. Elamin, Sh. Younis, and D.M. Ayaad
Elsevier BV
Nada Alfryyan, Norah A.M. Alsaif, Hanan Al-Ghamdi, Shams A.M. Issa, Hesham M.H. Zakaly, A.A. El-Hamalawy, M.S. Sadeq, A.M. Abdelghany, and Y.S. Rammah
Elsevier BV
Norah A.M. Alsaif, Nada Alfryyan, Hanan Al-Ghamdi, A. M. Abdelghany, M. S. Sadeq, A. S. Abouhaswa, Abdulaziz M. Alanazi, and Y. S. Rammah
Springer Science and Business Media LLC
Gharam A. Alharshan, Ahmed M. A. El-Seidy, Mamdouh I. Elamy, Islam M. Nabil, Adel M. El-Refaey, R. A. Elsad, M. S. Shams, A. M. Abdelghany, and Y. S. Rammah
Springer Science and Business Media LLC
A. S. Abouhaswa, A. M. Abdelghany, Nada Alfryyan, Norah A. M. Alsaif, Y. S. Rammah, and Islam M. Nabil
Springer Science and Business Media LLC
Ahmed H. Hammad, A. M. Abdelghany, and G. O. Rabie
Springer Science and Business Media LLC
M. A. Aboelwafa, A. M. Abdelghany, A. H. Oraby, and M. S. Meikhail
Springer Science and Business Media LLC
AbstractThe presented work sheds light on the impact of CeO2 content and sintering temperatures on the microstructure and physical characteristics of Soda-Lime-Alumino Silicate Glass Ceramics for possible use in dental applications. Samples of nominal composition 45SiO2-15Al2O3-(20-x)NaO2-(20-x)CaO-2xCeO2, (x = 1–5) were successfully synthesized via the sol–gel technique. Synthesized samples were characterized by Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, X-ray diffraction scan (XRD), and Scanning electron microscopy (SEM) supplemented with an EDX and calculate roughness parameters in addition to physical properties such as (density, free volume, oxygen packing density, etc.). XRD reveals that 850 °C is the optimal temperature to transform samples to their corresponding glass–ceramic derivative, leading to the rearrangement of Qn Si in the glass network. The rearrangement was explained through FTIR, Raman, and the surface morphology of samples. In addition, the increased density is attributed to the high compactness of the glass ceramic formed resulting from the addition of CeO2, which improves the durability and hardness of the samples.
Norah A. M. Alsaif, Hanan Al-Ghamdi, Nada Alfryyan, A. M. Abdelghany, Y. S. Rammah, S. M. Kotb, S. Talaat, and A. S. Abouhaswa
Springer Science and Business Media LLC
A.M. Saleh, A.M. Abdelghany, and W.M. Awad
Elsevier BV
Norah A. M. Alsaif, Hanan Al-Ghamdi, R. A. Elsad, A. M. Abdelghany, Shaaban M. Shaaban, Y. S. Rammah, and Islam M. Nabil
Springer Science and Business Media LLC
Hagar H. Ibrahim, A. M. Abdelghany, Mohamed H. Gaber, and Said A. Ali
Springer Science and Business Media LLC
AbstractChitosan/AgVO3 nanocomposite thin films were synthesized via solution casting method using water as solvent. Silver vanadate (AgVO3) nanoparticles were prepared separately using a chemical precipitation technique. The structure and properties of the nanocomposite films were investigated using Fourier transform infrared spectroscopy (FTIR), UV–visible spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), swelling ratio tests, and antimicrobial assays. FTIR analysis confirmed the interaction between the amide I group of chitosan and AgVO3 nanoparticles. Increasing AgVO3 content resulted in decreased optical bandgap of the nanocomposite films. XRD patterns showed the amorphous nature of the nanocomposites. SEM images revealed evenly distributed AgVO3 nanoparticles within the chitosan matrix. The swelling ratio decreased with higher AgVO3 loading, suggesting improved hydrolytic stability. The nanocomposite films demonstrated potent antimicrobial activity against gram-positive and gram-negative bacteria as well as Candida fungus. The tunable optical properties, swelling behavior, and antibacterial effects spotlight the potential of chitosan/AgVO3 nanocomposites for versatile biomedical applications.
Norah A. M. Alsaif, Hanan Al-Ghamdi, F. Amghar, Y. S. Rammah, A. M. Abdelghany, and R. M. Shalaby
Springer Science and Business Media LLC
ICMMS Conference
Egypts Presidential Specialized Council for Education and Scientific Research