Article
Polymer Science
Ahmed Abd El-Fattah, Heba Youssef, Mohamed Abdel Hady Gepreel, Rafik Abbas, Sherif Kandil
Summary: The research found that adding 10 wt% of nano-silica improved the elastic modulus, flexural strength, and microhardness of PEEK nanocomposites. However, adding nano-silica fillers in a higher weight percentage, over 10%, significantly damages the mechanical characteristics of the nanocomposite.
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
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
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
M. F. Paiva, M. Rizk, J. P. Pessan, M. Kreutz, B. Rohland, R. Biehl, A. Stadler, J. Stellbrink, A. Wiegand
Summary: This study investigated the effects of POSS-8 on various material properties and mineral precipitation potential of a resin infiltrant. The results showed that POSS-8 did not affect flexural strength, water sorption, and softening ratio. At lower concentrations, the apparent degree of conversion increased while the E-modulus remained constant.
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
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
Ilaria Roato, Tullio Genova, Donatella Duraccio, Federico Alessandro Ruffinatti, Diletta Zanin Venturini, Mattia Di Maro, Alessandro Mosca Balma, Riccardo Pedraza, Sara Petrillo, Giorgia Chinigo, Luca Munaron, Giulio Malucelli, Maria Giulia Faga, Federico Mussano
Summary: Mechanical and biological behaviors of PMMA/Al2O3 composites with different weight percentages of Al2O3 were characterized for implant-supported prostheses. Al2O3 particles increased the flexural modulus of PMMA, with the highest value achieved with 40 wt.% Al2O3. The flexural strength decreased due to filler aggregates and voids but remained satisfactory. Surface roughness and water contact angle influenced protein adsorption and cell adhesion. No cytotoxic effects were found, indicating biocompatibility and cell growth capabilities. Al2O3 guided tissue formation but did not enhance osteoconductive properties.
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
Materials Science, Ceramics
V. Dhivya, R. Dharshini, K. Sakthipandi, G. Rajkumar
Summary: The bioactivity of fluorophosphate glasses with different titanium dioxide (TiO2) content was investigated for potential application in tissue engineering. A glass system with varying TiO2 composition was produced and evaluated for mechanical strength, in vitro bioactivity, pH value, F- ion release, and structural variation. The biological properties were assessed using the MTT assay. The addition of 1.0 mol% TiO2 showed exceptional properties and high cell viability percentage.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
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
Chemistry, Physical
Wenhao Sha, Yingying Liu, Yabin Zhou, Yihua Huang, Zhengren Huang
Summary: Different reaction-bonded boron carbide composites with varying levels of carbon were prepared and the effect of carbon content on mechanical properties was studied. The results showed that an appropriate addition of free carbon could improve the strength of the composite, while excessive carbon content would decrease the strength.
Article
Chemistry, Multidisciplinary
Anna Kirschner, Samuel David, Giulia Brunello, Ludger Keilig, Dieter Drescher, Christoph Bourauel, Kathrin Becker
Summary: Autoclaving cycles have an impact on the Vickers hardness and flexural modulus of 3D-printed insertion guides, particularly in cycle 2.
APPLIED SCIENCES-BASEL
(2022)
Article
Biochemistry & Molecular Biology
Ahmed Abd El-Fattah, Elizabeth Grillo Fernandes, Federica Chiellini, Emo Chiellini
Summary: Amphiphilic copolymers with interesting architecture and tunable properties are promising materials for biomedical applications. Enzymatic catalysis provides a suitable alternative for the preparation of these materials without the use of toxic catalysts. The structure-property relationship of copolymers was studied by varying the molecular weight of Pluronic (EPE) and the molar ratios between ε-caprolactone monomer and EPE macro-initiator (M/In). The obtained copolymers were chemically characterized and their morphologies evaluated. The results showed a correlation between the differential scanning calorimetry data and X-ray diffraction data, suggesting the importance of the central block length in crystal formation. Preliminary cytotoxicity experiments confirmed the non-toxic nature of the copolymers.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(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)
Article
Energy & Fuels
Hassan Elnagar Hassan Ibrahim, Ali Gad, Mosaad EL-Kasaby, Shaker Ebrahim, Sherif Kandil
Summary: This study aimed to inhibit the deposition of paraffin wax at low temperatures by using Poly (m-aminophenol) (PmAP) as a pour point depressant (PPDs). The photomicrographs showed that PmAP reduced the size of wax crystals, improving the flowability of the crude oil.
PETROLEUM SCIENCE AND TECHNOLOGY
(2023)
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)
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
Dentistry, Oral Surgery & Medicine
Mohamed Abdelrasoul, Ahmed Abd El-Fattah, Gehan Kotry, Omneya Ramadan, Marwa Essawy, Jahangir Kamaldin, Sherif Kandil
Summary: This study evaluated the effectiveness of a novel biodegradable bioactive hydrogel template loaded with melatonin in periodontal regenerative therapy. The results showed that the melatonin-loaded template accelerated bone formation and improved its quality, leading to complete periodontal regeneration.
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
Biochemistry & Molecular Biology
Norhan Nady, Noha Salem, Mohamed R. R. Elmarghany, Mohamed S. S. Salem, Sherif H. H. Kandil
Summary: This work presents the fabrication and characterization of novel magnetic mixed cellulose-based matrix membranes, which can be used in oxygen-enrichment process. The membranes combine the advantages of low-cost cellulose acetate (CA) as the polymer matrix and a low-cost magnetic filler. The membranes were fabricated without an external magnetic field and were characterized using various analysis techniques. The results show that the magnetic mixed CA matrix membranes have good mechanical properties and porosity, and exhibit high oxygen transition rate compared to the blank CA membrane.
Article
Chemistry, Physical
Amr A. Mahrous, Abdullah Alhammad, Faisal Alqahtani, Yousif Aljar, Ahmed Alkadi, Noha Taymour, Abdulkareem Alotaibi, Sultan Akhtar, Mohammed M. Gad
Summary: This study aimed to evaluate the effect of artificial toothbrushing simulation on the surface roughness, microhardness, and color stability of different ceramic materials. The results showed that toothbrushing had no effect on surface roughness and color stability, but decreased microhardness. Further research is needed to explore the toothbrushing effect with different glazing and ceramic materials.
Article
Polymer Science
Mona A. Aziz Aljar, Suad Rashdan, Abdulla Almutawah, Ahmed Abd El-Fattah
Summary: Globally, water contamination by heavy metals is a serious problem that affects the environment and human health. Adsorption is the most efficient way of water treatment for eliminating heavy metals. In this study, a PVA-CS/CE composite hydrogel adsorbent was prepared for the removal of Pb(II), Cd(II), Zn(II), and Co(II) from water. The adsorbent exhibited a spherical shape, robust structure, and suitable functional groups for heavy metal adsorption.
Review
Materials Science, Multidisciplinary
Abdulrahman Allangawi, Eman F. H. Alzaimoor, Haneen H. Shanaah, Hawraa A. Mohammed, Husain Saqer, Ahmed Abd El-Fattah, Ayman H. Kamel
Summary: Global warming and climate changes caused by the greenhouse gas effect are major environmental problems. The concentration of carbon dioxide in the atmosphere has increased significantly, leading to acute and chronic environmental issues. While carbon capture utilization and storage methods can minimize CO2 emissions, their wide applicability is hindered by cost and efficiency concerns.
C-JOURNAL OF CARBON RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Maram A. AlGhamdi, Shaimaa M. Fouda, Noha Taymour, Sultan Akhtar, Soban Q. Khan, Mohamed S. Ali, Ahmed M. Elakel, Essam A. Nassar, Mohammed M. Gad
Summary: This study evaluated the effect of TiO2 nanoparticle (TNP) addition and the post-curing time (PCT) on the flexural properties and hardness of 3D-printed denture base resins. The results showed that the addition of TNPs significantly increased the flexural strength, while the 2% TNP concentration decreased the elastic modulus and hardness. Increasing the PCT also increased the flexural strength and hardness.