Mohamed Taha
@aast.edu
Mechanical Engineering Department
College of Engineering& Technology, Arab Academy for Science, Technology, and Maritime Transport, South valley campus, 81528 Aswan, Egypt.
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Ahmed Fouly, Mohamed Taha, Thamer Albahkali, Muhammad Ali Shar, Hany S. Abdo, and A Nabhan
Institute of Electrical and Electronics Engineers (IEEE)
Ahmed Nabhan, Ahmed Fouly, Thamer Albahkali, Muhammad Ali Shar, Hany S Abdo, and Mohamed Taha
IOP Publishing
Abstract The impressive mechanical properties and robust resistance to wear recorded by nano-polymeric composites have positioned them as a viable alternative in many applications. When it comes to frictional materials, high-density polyethylene (HDPE) emerges as one of the best candidate materials that can be used. However, it tribological properties need more enhancement to suite with wide variety of applications. The objective of the current study is to identify the optimal loading ratio using a comprise of paraffin oil and nano-graphene with varying loading compositions. Different experiments were carried out to assess the modulus of elasticity, hardness, and strength. Additionally, the friction coefficient and wear resistance of the proposed nanocomposite have been estimated. Surfaces topographies were analyzed to recognize the wear mechanism. The results pointed that samples containing 5% paraffin oil and 0.5 wt% have relatively better mechanical and tribological behavior compared to further compositions; where, a 38% decrease in wear and a 34% reduction in COF compared to other composite samples.
Nabhan A., Mohamed Taha, Ahmed Mohamed Mahmoud Ibrahim, and Ameer A. K.
Springer Science and Business Media LLC
AbstractThe unique mechanical properties and wear resistance of HDPE give it the potential as an alternative to frictional material. The current research focuses on using hybrid nanoparticles with various loading fillers to determine the best additive contents. The mechanical and tribological characteristics were examined and evaluated. The HDPE nanocomposite samples containing 0.5, 1.0, 1.5, and 2.0 wt.% filling content of Al2O3 nanoparticles (NPs) and 0.5, and 1.0 wt.% of graphene nanoplatelets (GNPs) were fabricated. The results showed a good enhancement in the mechanical and tribological properties of HDPE composites with the presence of nano additives. The HDPE nanocomposites recorded the best performance with a loading amount of 2.0 wt.% with an equal ratio of hybrid nanofiller Al2O3 NPs and GNPs.
Hamouda M Mousa, Mostafa M. Sayed, Ibrahim M. A. Mohamed, M. S. Abd El-sadek, Emad Abouel Nasr, Mohamed A. Mohamed, and Mohamed Taha
MDPI AG
Multifunctional membrane technology has gained tremendous attention in wastewater treatment, including oil/water separation and photocatalytic activity. In the present study, a multifunctional composite nanofiber membrane is capable of removing dyes and separating oil from wastewater, as well as having antibacterial activity. The composite nanofiber membrane is composed of cellulose acetate (CA) filled with zinc oxide nanoparticles (ZnO NPs) in a polymer matrix and dipped into a solution of titanium dioxide nanoparticles (TiO2 NPs). Membrane characterization was performed using transmission electron microscopy (TEM), field emission scanning electron microscopy (FESEM), and Fourier transform infrared (FTIR), and water contact angle (WCA) studies were utilized to evaluate the introduced membranes. Results showed that membranes have adequate wettability for the separation process and antibacterial activity, which is beneficial for water disinfection from living organisms. A remarkable result of the membranes’ analysis was that methylene blue (MB) dye removal occurred through the photocatalysis process with an efficiency of ~20%. Additionally, it exhibits a high separation efficiency of 45% for removing oil from a mixture of oil–water and water flux of 20.7 L.m−2 h−1 after 1 h. The developed membranes have multifunctional properties and are expected to provide numerous merits for treating complex wastewater.
Ragab Abouzeid, Mohamed Taha, Ramzi Khiari, and Qinglin Wu
Springer Science and Business Media LLC
Mohamed Taha, Ahmed Fouly, Hany S. Abdo, Ibrahim A. Alnaser, Ragab Abouzeid, and Ahmed Nabhan
MDPI AG
The efficient utilization of rice waste has the potential to significantly contribute to environmental sustainability by minimizing the waste impact on the environment. Through repurposing such waste, novel materials can be developed for various biomedical applications. This approach not only mitigates waste, but it also promotes the adoption of sustainable materials within the industry. In this research, rice-straw-derived nanofibers (RSNFs) were utilized as a reinforcement material for high-density polyethylene (HDPE). The rice-straw-derived nanofibers were incorporated at different concentrations (1, 2, 3, and 4 wt.%) into the HDPE. The composites were fabricated using twin-screw extrusion (to ensure homogenous distribution) and the injection-molding process (to crease the test samples). Then, the mechanical strengths and frictional performances of the bio-composites were assessed. Different characterization techniques were utilized to investigate the morphology of the RSNFs. Thermal analyses (TGA/DTG/DSC), the contact angle, and XRD were utilized to study the performances of the HDPE/RSNF composites. The study findings demonstrated that the addition of RSNFs as a reinforcement to the HDPE improved the hydrophilicity, strength, hardness, and wear resistance of the proposed bio-composites.
Mohamed Qenawy, Mohamed Taha, Junfeng Wang, and A.H. Abdelbaky Elbatran
Elsevier BV
Ahmed Nabhan, Galal Sherif, Ragab Abouzeid, and Mohamed Taha
MDPI AG
Hip joint collapse is a very common health problem. Many cases need a joint replacement, so nano-polymeric composites are an ideal alternative solution. Due to its mechanical properties and wear resistance, HDPE might be considered a suitable alternative to frictional materials. The current research focuses on using hybrid nanofiller TiO2 NPs and nano-graphene with various loading compositions to evaluate the best loading amount. The compressive strength, modules of elasticity, and hardness were examined via experiments. The COF and wear resistance were evaluated via a pin-on-disk tribometer. The worn surfaces were analyzed based on 3D topography and SEM images. The HDPE samples with various compositions of 0.5%, 1.0%, 1.5%, and 2.0 wt.% filling content of TiO2 NPs and Gr (with a ratio of 1:1) were analyzed. Results revealed that hybrid nanofiller with a composition of 1.5 wt.% exhibits superior mechanical properties compared to other filling compositions. Moreover, the COF and wear rate decreased by 27.5% and 36.3%, respectively.
A. Nabhan, Mohamed Taha, and Nouby M. Ghazaly
Elsevier BV
Ahmed Nabhan, Ahmed Rashed, Mohamed Taha, Ragab Abouzeid, and Ahmed Barhoum
MDPI AG
Numerous problems occur during engine operation, such as start-up, lack of lubrication, and overheating, resulting in engine components’ wear, power loss, and fuel consumption. Nanomaterials dispersed in engine oil can play an important role in improving the tribological properties of oil lubricants. This study investigated the influence of multi-walled carbon nanotubes (MWCNTs) and aluminum oxide nanoparticles (Al2O3 NPs) as nano-additives for lubricants. Different engine oil samples were loaded with 0.5–2.0 wt% Al2O3 NPs and 0.5–1.0 wt% MWCNTs and compared with unmodified oil. The tribological performance of the nano lubricants was investigated using the four-ball test method. In addition, the wear scar in the engine was evaluated using 3D micrographs and scanning electron microscopy (SEM). The results of the sliding surfaces with hybrid MWCNTs/Al2O3 NPs showed better friction performance and wear resistance. The coefficient of friction (COF) and wear scar width were improved by 47.9% and 51.5%, respectively, compared with unmodified oil.
Mohamed M. Taha, Mahmoud S. Rizk, Mohamed A. Zayed, Fatehy M. Abdel-Haleem, and Ahmed Barhoum
MDPI AG
Monitoring glucose levels is important not only for diabetics, but also for tracking embryonic development in human embryo culture media. In this study, an optochemical sensor (glucose-selective polymer membrane) was fabricated for the determination of glucose in serum from diabetic patients and the culture media of human embryos. The optode membranes were formulated using polyvinyl chloride (PVC) as the polymer matrix and 4′,5′-dibromofluorescein octadecyl ester (ETH 7075) as the chromoionophore. The sensitivity of the optode membranes was optimized using two different plasticizers (tricresyl phosphate-TCP and nitrophenyloctyl ether-NOPE) and three ionophores (nitrophenylboronic acid-NPBA, trifluorophenyboronic acid-TFPBA, 4′-nitrobenzo-15-crown-5) and tested for glucose detection. The best optode membrane was formulated from 49.5% PVC, 49.5% TCP, 1% NPBA, and 1% ETH 7075. It showed a linear dynamic range of 10−3 M to 10−1 M, with a detection limit of 9 × 10−4 M and a response time of 2 min. The detection mechanism involves H-bonding between NPBA and glucose, which was confirmed by Fourier transform infrared (FTIR) and nuclear magnetic resonance (NMR). The reaction also involves the formation of boronate esters in basic media with deprotonation of the chromoionophore (ETH 7075), leading to a decrease in UV–Vis absorbance at λmax = 530 nm. The membrane optode was used for glucose determination in synthetic culture medium, commercial embryo culture medium (GLOBAL® TOTAL® W/HEPES), and serum from normal and diabetic patients, showing good accuracy and precision of the optode.
Mahmoud Gallab, Mohamed Taha, Ahmed Rashed, and Ahmed Nabhan
Egypts Presidential Specialized Council for Education and Scientific Research
Mohamed Qenawy, Mohamed Taha, and A.H. Abdelbaky Elbatran
Elsevier BV
Nahla El-Wakil, Mohamed Taha, Ragab Abouzeid, and Alain dufresne
Springer Science and Business Media LLC
Mohamed Taha, Mohammad Hassan, Montasser Dewidare, M.A. kamel, W. Y. Ali, and Alain Dufresne
Egypts Presidential Specialized Council for Education and Scientific Research
Huge amounts of rice straw are left every year in different areas of the world; these residues still cause environmental problems due to un-safe practices such as burning. Isolation of nanomaterials such as cellulose nanofibers represents an effective way for utilization of rice straw in advanced products. The current work aimed at evaluating the properties of rice straw cellulose nanofibers isolated from bleached and high-lignin unbleached pulps using a multi-criterion quality index, which allows a benchmarking analysis between different sources, processes and features. Rice straw was subjected to neutral sulfite pulping process to obtain the high-lignin unbleached pulp while the bleached pulp was obtained by bleaching the produced pulp with NaClO2/acetic acid mixture. Using mechanical pretreatment (Valley beater), and ultrafine friction grinder both bleached and unbleached pulps were used to obtain cellulose nanofibers with and without lignin (LRSNF and RSNF, respectively). Nanopaper sheets were prepared from both types of nanofibers and characterized using tensile tests, optical microscopy, atomic force microscopy, electron scanning microscopy, water contact angle and surface energy. Cellulose nanofibers generated from rice straw were scored using a multi-criterion quality index depending on characterization using eight tests (nanosized and macro size fraction, turbidity, Young's modulus, porosity, transmittance, tear resistance, and homogeneity).
Abdalla Abdal-hay, Mohamed Taha, Hamouda M. Mousa, Michal Bartnikowski, Mohammad L. Hassan, Montasser Dewidar, and Saso Ivanovski
Elsevier BV