Article
Polymer Science
Noha Taymour, Amal E. Fahmy, Mohamed Abdel Hady Gepreel, Sherif Kandil, Ahmed Abd El-Fattah
Summary: In this study, nanocomposites based on PEEK reinforced with bioactive silicate-based bioceramics were prepared to improve the limitations of PEEK in dental implant applications. The addition of bioactive nanofillers significantly improved the properties of the nanocomposites, including elastic modulus, flexural strength, and microhardness. In vitro experiments showed that the surface of the PEEK nanocomposites could precipitate bone minerals in biomimetic simulated body fluid, making them a promising alternative for long-term load-bearing implants.
Article
Chemistry, Physical
Tong Li, Zhuoyu Song, Xiangfei Yang, Juan Du
Summary: Thermoplastic components are gaining attention for their advantages, but the challenge lies in their diverse mechanical properties caused by uncertain factors during the molding process. This paper systematically investigates the effects of processing parameters on the mechanical properties of PEEK plates and finds that temperature and time can sensitively change the properties, while pressure has limited impact. The optimal process parameters are a hot compression temperature of 400°C, a compression time of 30 min, and a pressure of 2.5 MPa.
Article
Materials Science, Ceramics
Ramamohana Reddy Bellum
Summary: This study experimentally investigated the mechanical and microstructural properties of polypropylene and steel fiber reinforced geopolymer mortar. The results showed that the addition of fibers improved the flexural performance and compressive strength of the geopolymer mortar.
CERAMICS INTERNATIONAL
(2022)
Article
Engineering, Chemical
Yulin Zhang, Fuqian Yang
Summary: The study prepared carbon microspheres using hydrothermal process, and investigated the compression behavior of wetted carbon-based disks made from carbon microspheres and polytetrafluoroethylene. It was found that the compressive stress exhibited statistical variability and followed a power-law relation with the average maximum strain.
Article
Chemistry, Physical
K. Korgiopoulos, A. Sadeghi, M. Pekguleryuz
Summary: This study investigates the effect of Yttrium on Mg17Al12, finding that low and high Y additions can respectively decrease and increase its lattice constant, leading to complex influences on its mechanical properties.
Article
Mechanics
K. P. Arjun, S. de Barros, S. Budhe
Summary: A theoretical analysis for determining the elastic and flexural modulus of natural fibre reinforced hybrid composite is proposed in this paper. The new approach showed better agreement with experimental results and can be adopted as a primary tool for predicting and optimizing composite parameters for maximum performance. The theoretical modulus was not accurately predicted by the rule of hybrid mixture method.
COMPOSITE STRUCTURES
(2022)
Article
Dentistry, Oral Surgery & Medicine
Ahmad M. Al-Thobity, Mohammed M. Gad, Imran Farooq, Abdullah S. Alshahrani, Yousif A. Al-Dulaijan
Summary: This study evaluated the flexural strength, elastic modulus, microhardness, and surface roughness of monolithic zirconia, lithium disilicate ceramics, and feldspathic ceramics after exposure to different acidic solutions. The results showed that the tested acidic agents significantly affected the performance of feldspathic porcelain, while the flexural strength and elastic modulus of lithium disilicate and zirconia did not change significantly.
JOURNAL OF PROSTHODONTICS-IMPLANT ESTHETIC AND RECONSTRUCTIVE DENTISTRY
(2021)
Article
Chemistry, Physical
Mona Gibreel, Leila Perea-Lowery, Lippo Lassila, Pekka K. Vallittu
Summary: This study compared the flexural strength and elastic modulus of three-dimensional (3D) printed, conventional heat-cured, and high-impact denture materials. The findings showed that the 3D printed specimens exhibited higher flexural strength compared to the conventional and high-impact ones, indicating their potential as an alternative to conventionally fabricated materials. The flexural strength and elastic modulus of the conventional and high-impact materials were comparable.
Article
Polymer Science
Srinivasarao Yaragalla, Muhammad Zahid, Jaya Kumar Panda, Nikolaos Tsagarakis, Roberto Cingolani, Athanassia Athanassiou
Summary: A simple and scalable fabrication process of graphene nanoplatelets (GnPs)-reinforced polyether ether ketone (PEEK) filaments with enhanced mechanical and thermal performance was successfully demonstrated. The addition of GnPs to PEEK improved the thermal stability of the polymer matrix, but excessive GnPs content can negatively affect the mechanical performance.
Article
Polymer Science
Akanksha Adaval, Cherumannil K. Subash, Valiyaveetil H. Shafeeq, Shiva Singh, Pradip K. Maji, Mohammed Aslam, Terence W. Turney, George P. Simon, Arup R. Bhattacharyya
Summary: This study reports for the first time the unique ferroelectric and piezoelectric properties displayed by UHMWPE/GO nanocomposites. GO was encapsulated in UHMWPE to prepare the nanocomposites, where UHMWPE chains were intercalated in the graphitic stacks of GO, resulting in higher dielectric permittivity, remnant polarization, and coercive field. Additionally, a higher piezoelectric coefficient was observed in UHMWPE/GO nanocomposite. Evaluation of the importance of this article in the research of ferroelectric and piezoelectric composites: 8 out of 10.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Chemistry, Physical
Mohammad E. Golmakani, Tomasz Wiczenbach, Mohammad Malikan, Reza Aliakbari, Victor A. Eremeyev
Summary: The present research investigated the mechanical properties of wood flour reinforced polyethylene polymer composites with varying wood flour size, aspect ratios, and mold injection temperature. Results showed that reducing the wood flour size decreased the tensile strength and modulus, flexural strength and impact energy, while increasing the flexural modulus. Additionally, increasing the injection molding temperature decreased the tensile strength and modulus, impact energy, while increasing the flexural strength and modulus. Thus, optimizing the injection molding temperature can improve the mechanical properties of the composite.
Article
Materials Science, Ceramics
Huangyue Cai, Fangwei Guo, Zifan Zhang, Xiao Shan, Xin Wang, Xiaohui Fan, Xiaofeng Zhao
Summary: This study experimentally and theoretically investigated the effect of different pores on stress distribution and mechanical properties of membranes with multi-scale pores. The results showed that the gradient diameter of macro-channels led to flexural strength dependence on the loading direction. Additionally, increasing the penetration depth of these macro-channels did not result in strength degradation, as the channel tails did not interfere with the maximum bending stress. The flexural strength of the membranes was determined by the cellular structure surrounding the macro-channels, and the bimodal porosity distribution reduced the elastic modulus, which could improve strain tolerance.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Saleh Zidan, Nikolaos Silikas, Suhad Al-Nasrawi, Julfikar Haider, Abdulrahman Alshabib, Alshame Alshame, Julian Yates
Summary: The study demonstrates that silane-treated zirconia nanoparticles significantly improve the surface hardness and flexural strength of high-impact heat-cured acrylic resin-zirconia nanocomposites.
Article
Materials Science, Multidisciplinary
Mohammed A. A. Taha, M. M. El-zaidia, Mai Z. Z. Zaki, H. M. Abomostafa
Summary: Cu-matrix hybrid nanocomposites were prepared using powder metallurgy process with varying amounts of silicon carbide (SiC) and fly ash nano particles. XRD and TEM were used to describe the microstructure of the produced powders. The sintered samples' microstructure, mechanical, wear, thermal, and electrical characteristics were examined. The results showed that adding SiC and fly ash ceramics successfully decreased particle sizes and improved the properties of the nanocomposites.
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
(2023)
Article
Materials Science, Characterization & Testing
A. Degirmenci, B. U. Degirmenci, M. Salameh
Summary: The effects of different acidic beverages on the properties of various types of composites were evaluated in this study. Significant influences of beverage type and immersion cycle were found on surface roughness and microhardness, while artificial saliva had minimal effects on the composites. Injectable composites showed promising flexural strength values after short- and long-term immersion cycles, indicating their potential for clinical use.
STRENGTH OF MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Saad Ebied, Atef Hamada, Mahmoud H. A. Gadelhaq, Kenta Yamanaka, Huakang Bian, Yujie Cui, Akihiko Chiba, Mohamed A. H. Gepreel
Summary: A novel biomaterial Ti-17Mo was studied for orthopedic implant applications, and its hot working behavior and deformation characteristics were investigated. The results showed that dynamic recovery was more active than dynamic recrystallization, but partial discontinuous DRX by grain boundary bulging was activated at high temperatures and low strain rates.
Article
Engineering, Manufacturing
Mohamed Attalla, Sherif Kandil, Mohamed Abdel-Hady Gepreel, M. A. Daha
Summary: Residual stresses play a crucial role in the integrity of welded joints, with buffer layer procedures leading to lower longitudinal stresses in the repair area. The transverse residual stresses in all repair mockups were below the yield strength of the corresponding metals.
JOURNAL OF MANUFACTURING PROCESSES
(2022)
Article
Chemistry, Physical
Ahmed H. Awad, Hassan A. El-Hofy, Akihiko Chiba, Mohamed Abdel-Hady Gepreel
Summary: This study investigated the effects of zirconium content and thermomechanical treatment on the properties of low-cost Ti-14Mn-(x)Zr alloys. It was found that appropriate zirconium content, hot forging, and aging improved the hardness, strength, and ductility of the alloys. The formation of a dual-phase structure in the alloy resulted in higher compressive yield stress and malleability, surpassing the performance of commercial alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Review
Materials Science, Multidisciplinary
Mohamed Attalla, Sherif Kandil, Mohamed Abdel-Hady Gepreel, M. A. Daha
Summary: This study prepared repairs for A387 grade 11/AISI 304 dissimilar welded joints using different composition welding electrodes, and found that Nickel-141 has a significant influence on impeding carbon migration. The results showed that using Nickel-141 can significantly improve impact properties, while the decrease in impact results for conventional processes is partially due to the formation of a carbon-enriched zone.
SCIENCE AND TECHNOLOGY OF WELDING AND JOINING
(2022)
Article
Polymer Science
Noha Taymour, Amal E. Fahmy, Mohamed Abdel Hady Gepreel, Sherif Kandil, Ahmed Abd El-Fattah
Summary: In this study, nanocomposites based on PEEK reinforced with bioactive silicate-based bioceramics were prepared to improve the limitations of PEEK in dental implant applications. The addition of bioactive nanofillers significantly improved the properties of the nanocomposites, including elastic modulus, flexural strength, and microhardness. In vitro experiments showed that the surface of the PEEK nanocomposites could precipitate bone minerals in biomimetic simulated body fluid, making them a promising alternative for long-term load-bearing implants.
Review
Energy & Fuels
Osbert Akatwijuka, Mohamed A-H Gepreel, Ahmed Abdel-Mawgood, Mitsuo Yamamoto, Yukie Saito, Ahmed H. Hassanin
Summary: The world's reliance on synthetics and the accumulation of plastic waste in the ocean have caused severe environmental issues. Finding sustainable alternatives using abundant agro-wastes is a promising solution. This study examines the potential, extraction techniques, properties, current applications, and future prospects of banana fibers, highlighting their positive impact on reducing the burden on traditional fiber crops and benefiting rural communities.
BIOMASS CONVERSION AND BIOREFINERY
(2022)
Article
Physics, Multidisciplinary
Essam R. I. Mahmoud, Awaludin Shaharoun, Mohamed A. Gepreel, Saad Ebied
Summary: This study investigated the phase composition and mechanical properties of a multi-component high-entropy alloy through calculations and experiments. The results showed that the microstructure and properties of the alloy varied under different processing conditions, with the cold rolled sample exhibiting higher compressive yield strength and micro-hardness, while the annealed sample showed improved wear resistance.
Article
Materials Science, Multidisciplinary
Sarabjeet Singh Sidhu, Mohamed Abdel-Hady Gepreel, Marjan Bahraminasab
JOURNAL OF MATERIALS RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Essam R. Mahmoud, Awaluddin Shaharoun, Mohamed A. Gepreel, Saad Ebied
Summary: This study investigates the effects of alloying elements on microstructures and mechanical properties of high-entropy alloys (HEAs) in the as-cast condition. Six new HEAs were designed and manufactured, and the relationship between alloy composition, particularly Si content, and hardness/compression properties were established. The experimental results matched the predicted equilibrium phases.
Article
Materials Science, Multidisciplinary
Sally Elkatatny, Ahmed W. Abdelghany, Atef Hamada, Akihiko Chiba, Mohamed A. H. Gepreel
Summary: In this study, non-equiatomic AlCrFeMnx-TiNi high-entropy alloys bearing cost-effective elements were developed to enhance the mechanical strength. The addition of Ti significantly improved the strength, resulting in a high combination of compressive strength and ductility in the Ti-containing high-entropy alloy.
MATERIALS SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Physical
Essam R. Mahmoud, Lamiaa Z. Mohamed, Mohamed A. Gepreel, Saad Ebied, Aliaa Abdelfatah
Summary: This study reports on the microstructure and corrosion resistance of a new high-entropy alloy Fe36Mn20Ni20Cr16Al5Si3 in different acidic solutions. The experimental results show that the cold-rolled alloy is more resistant to corrosion in 0.6 M NaCl, while it is more susceptible to localized pits in the presence of H2SO4. The solution-treated alloy exhibits the highest corrosion resistance with the addition of H2SO4 to 0.6 M NaCl.
Article
Crystallography
Essam R. Mahmoud, Sohaib Z. Khan, Abdulrahman Aljabri, Hamad Almohamadi, Mohamed Abdelghany Elkotb, Mohamed A. Gepreel, Saad Ebied
Summary: In this study, pure aluminum and low-carbon steel alloy were successfully clad using friction stir processing, resulting in a sound interface without intermetallic compound formation. Increasing the rotation speed and tool pin length contributed to interface bonding and enhanced hardness.
Article
Chemistry, Physical
Ahmed W. Abdelghany, Matias Jaskari, Atef S. Hamada, Antti Jarvenpaa, Hassan A. El-Hofy, Akihiko Chiba, Mohamed Abdel-Hady Gepreel
Summary: A new non-equiatomic high-entropy alloy (HEA), Al8Cr12Mn25Ni20Fe35, was successfully designed and prepared in this study. The hot deformation behavior and deformation mechanism of the alloy were investigated using compression tests, and the phase structure was analyzed using various techniques. A constitutive model based on the Zener-Holloman parameter was implemented, and the high activation energy for hot deformation was determined. The microstructural features and deformation mechanism were revealed through EBSD analysis.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Proceedings Paper
Materials Science, Multidisciplinary
Tukur Tsauri Bashir, Hussain Zuhailawati, Mohamed Abdel-Hady Gepreel
Summary: Alloying and thermo-mechanical processing can reduce the modulus of titanium to a level similar to human bones, making it suitable for orthopedic and dental applications. Two titanium alloys, Ti-15Mo and Ti-13Mo-2Fe, were designed to have low modulus 8-Ti using electronic parameters and molybdenum equivalent. These alloys exhibit excellent plasticity and ductility, making them promising for dental applications.
MATERIALS TODAY-PROCEEDINGS
(2022)
Article
Dentistry, Oral Surgery & Medicine
Maged A. Gadallah, Rahaf M. Darwish, Ahmed M. Alshimy, Mohamed A. Gepreel, Mona K. Marei
Summary: This study successfully coated the surface of titanium substrate with bioactive glass nanoparticles as the coating material. The characteristics of the coated surface, such as uniformity, chemical composition, and surface roughness, were analyzed. The experimental results showed that the bioactive glass nanoparticles exhibited biological activity that promoted tissue regeneration and cellular activity. This study suggests that bioactive glass nanoparticles may have a positive effect on the regenerative environment around dental implants.
INTERNATIONAL JOURNAL OF ORAL & MAXILLOFACIAL IMPLANTS
(2022)