Article
Engineering, Biomedical
Vanessa Kapps, Marcia Marie Maru, Oleksii Kuznetsov, Carlos Alberto Achete
Summary: In this study, two UHMWPE resins commonly used in orthopedics were evaluated through friction tests. The results showed that the average friction coefficient was around 0.18, with no significant difference between the two resins under different contact pressures and sliding velocities. However, the dispersion of the friction coefficient varied, with GUR 1020 showing a higher dispersion. The study also found that contact pressure had the most influence on wear amount, and GUR 1020 performed worse than GUR 1050 under high contact pressures. In conclusion, the dispersion analysis of tribological responses can provide important information on stability-related performance.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2023)
Article
Polymer Science
Koh-hei Nitta, Kota Ito, Asae Ito
Summary: This paper investigates the impact of annealing time on the specific heat enthalpy of polystyrene above the glass transition temperature. The authors propose an extended model to describe the endothermic overshoot peaks using dynamic mechanical spectra. The study suggests that the enthalpy recovery behavior of glassy polystyrene has a common structural relaxation mode with linear viscoelastic behavior, and the retardation spectra evaluated from the dynamic mechanical spectra can be used as the recovery function of the endothermic overshoot.
Article
Engineering, Biomedical
Lucas Gimenis de Moura, Eduardo Alberto Fancello, Edison da Rosa, Carlos Rodrigo de Mello Roesler, Clara Muniz da Silva de Almeida, Marcia Marie Maru de Morais
Summary: This study investigated the microstructural changes of UHMWPE GUR 1050 induced by plane-strain compression. It was found that the compression caused non-uniform molecular alignment, fragmentation, and kinking of polymer lamellae. The tribological behavior of the deformed polymer exhibited directional anisotropy, which could affect the material's wear performance.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Haobo Yuan, Cong Long, Junrong Yu, Fuyou Ke, Takeshi Shiono, Zhengguo Cai
Summary: Granular hydroxyl-functionalized UHMWPE fibers were successfully prepared through the activation of [(BuNSiMe2)-Bu-t(2,7-(t)Bu(2)Flu)]TiMe2 by silica-supported modified-methylaluminoxane. The obtained fibers showed improved creep resistance and hydrophilic properties without losing tensile strength, compared to unfunctionalized UHMWPE fibers or commercial HUMWPE fibers.
ADVANCED FIBER MATERIALS
(2022)
Article
Materials Science, Characterization & Testing
Hari Shankar Vadivel, Zainab Al-Maqdasi, Liva Pupure, Roberts Joffe, Mitjan Kalin, Nazanin Emami
Summary: Ultra-high molecular-weight polyethylene composites reinforced with Graphene Oxide, Nanodiamonds, and Short Carbon Fibres were characterized for their mechanical performance in tensile and short-term creep tests. The results showed a clear dependence of performance on the size scale/morphology of the reinforcements. Combining multiscale reinforcements resulted in an improvement that surpassed that of individual reinforcements.
Article
Materials Science, Ceramics
Hao Wang, Chengliang Zhao, Chuntao Chang, Shengli Zhu, Zhankui Zhao
Summary: The relationship between the heterogeneous structure and structural relaxation in metallic glasses was explored by investigating the quasielastic and viscoelastic behavior of a Zr55Cu30Ni5Al10 metallic glass. Stress-annealing treatment was used to retain elastic strain energy, and a unique creep recovery phenomenon was observed during the reheating process. The Maxwell model was employed to qualitatively describe the mechanisms of elastic strain energy retention and release.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2024)
Article
Polymer Science
Yan Zhao, Yuling Liang, Yingjie Yao, Hao Wang, Tong Lin, Yun Gao, Xiaoliang Wang, Gi Xue
Summary: In this study, partially disentangled ultrahigh molecular weight polyethylene (UHMWPE) was prepared by freeze-extracting, resulting in improved chain mobility. Low-field solid-state NMR using fully refocused H-1 free induction decay (FID) technique was employed to examine the chain segmental mobility during the melting process of UHMWPE with different degrees of entanglement. It was found that less-entangled UHMWPE had a harder time merging into mobile parts after detaching from crystalline lamella during melting. The use of H-1 double quantum (DQ) NMR revealed a difference in intramolecular-nucleated and intermolecular-nucleated PE before melting, but no noticeable difference between PE melts with different degrees of entanglement after melting.
Article
Construction & Building Technology
Zhiwei Qu, Ruizhe Si, Pengjiao Jia, Yingda Zhang
Summary: The application of reinforced concrete is widespread in engineering and architecture, with stress relaxation and creep being crucial time-dependent behaviors. However, the research on experimental relaxation behavior has been limited due to its complicated procedures. This study focuses on examining the creep and relaxation behavior of fly ash concrete and amending the existing creep model to improve its estimation accuracy.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Article
Polymer Science
Yinjun Chen, Huiyi Zhang, Soumabrata Majumdar, Rolf A. T. M. van Benthem, Johan P. A. Heuts, Rint P. Sijbesma
Summary: The diamide-imide equilibrium was utilized to synthesize dynamic covalent polymer networks with high processibility and processible viscoelasticity at elevated temperatures. The temperature-dependent mechanical properties of the materials were fully reversible, transitioning from elastic solids to predominantly viscous materials around 110 degrees Celsius.
Article
Materials Science, Textiles
Xiaoming Yu, Bin Zhang, Boqin Gu
Summary: This study investigates the mechanical properties of short fiber reinforced rubber matrix sealing composites (SFRC) through experimental methods, revealing the effects of fatigue cycles on material damage and determining the corresponding damage modes. Based on macroscopic phenomena and microscopic mechanism, parameters of new creep and stress relaxation models for SFRC after different fatigue cycles are established, showing that phenomenological models can effectively characterize the fatigue behavior of SFRC.
FIBERS AND POLYMERS
(2022)
Article
Chemistry, Physical
Che-Yu Lin, Ke-Vin Chang
Summary: This study investigates how loading and boundary conditions can affect the measurement accuracy of compressional viscoelastography using finite element analysis. The results suggest that these conditions can severely impact the accuracy of viscoelastic properties measurement in computational simulations.
Article
Materials Science, Multidisciplinary
Hari Shankar Vadivel, Marko Bek, Urska Sebenik, Lidija Slemenik Pers, Roland Kadar, Nazanin Emami, Mitjan Kalin
Summary: The study investigates the impact of UHMWPE particle size on its performance, as well as the effect of processing. While minor differences in properties among different grades of UHMWPE were observed, they are not sufficient to definitively determine the influence of particle size and processing on the material's properties and performance.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Materials Science, Multidisciplinary
Hao Wang, Chun-Tao Chang, Zhen-Duo Cui, Sheng-Li Zhu
Summary: This article discusses the isochronal creep recovery of a Zr-based material by constructing a dynamic viscoelastic model based on the Maxwell model, taking into account structural heterogeneity and relaxation effects. The study reveals that creep strain retention occurs when elastically deformed and plastically deformed regions coexist, and that residual creep strain is released when relaxation is activated sequentially. The temperature and time of stress-annealing treatment affect the creep strain recovery magnitude and peak temperature, while the stress-annealing stress only affects the recovery magnitude.
MATERIALS TODAY COMMUNICATIONS
(2023)
Review
Construction & Building Technology
Yue Huang, Junhui Wang, Qi'an Wei, Huaishuai Shang, Xiaoyang Liu
Summary: Although UHPC has shown excellent mechanical and durability performance, its applications are limited compared to conventional concrete. This is due to the unique creep characteristics of UHPC, which cannot be predicted using models developed for conventional concrete. To promote the application of UHPC, numerous studies have investigated its creep behavior. This review examines the creep response, influencing factors, and theoretical models of UHPC, and identifies areas that require further research.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Chemistry, Physical
Xin Wen, Zhiyao Li, Chenguang Yang, Kun Yan, Guozhong Wu, Dong Wang
Summary: A high creep resistance UHMWPE fiber was prepared by electron beam irradiation, with higher thermal decomposition temperature and smaller crystalline size. The gel content of radiation cross-linking fiber was up to 88%, effectively reducing molecular chain slippage and improving creep resistance.
RADIATION PHYSICS AND CHEMISTRY
(2022)
Article
Materials Science, Composites
Siti Noorbaini Sarmin, Mohammad Jawaid, Sameer A. Awad, Naheed Saba, Hassan Fouad, Othman Y. Alothman, Mohini Sain
Summary: This study evaluated the use of olive waste in epoxy-based biocomposites, finding that olive tree small branches and big branches were able to significantly increase the tensile and flexural strength of the composites. Additionally, scanning electron microscopy was used to analyze the microstructure of the composites.
POLYMER COMPOSITES
(2022)
Article
Materials Science, Composites
Sameer A. Awad, Mohammad Jawaid, Hassan Fouad, Naheed Saba, Hom Nath Dhakal, Othman Y. Alothman, Eman M. Khalaf
Summary: This study investigated the chemical interactions, mechanical, and thermal properties of alkali-treated and untreated hybrid fibers incorporated with bio phenolic matrix. The results showed that alkali treatment improved the tensile strength and modulus of the fiber composites and enhanced the interfacial bonding between the fibers and the phenolic resin.
POLYMER COMPOSITES
(2022)
Article
Polymer Science
Fehaid M. Alsubaie, Othman Y. Alothman, Hassan Fouad, Abdel-Hamid I. Mourad
Summary: This study reported the aqueous Cu(0)-mediated reversible deactivation radical polymerization (RDRP) of triblock copolymers with two block sequences at 0.0 degrees C. Sequence-controlled triblock copolymers were successfully synthesized via ultrafast one-pot synthesis and without any purification steps throughout the monomer additions. The resulting copolymers exhibited narrow dispersities, controlled chain length, and quantitative conversion.
Article
Materials Science, Paper & Wood
Lau Kia Kian, Hassan Fouad, Mohammad Jawaid, Zoheb Karim
Summary: Most polymer membranes used for water decentralization have drawbacks like non-renewable resources and complex processing. Therefore, there is a need for a sustainable and customizable nanomaterial for the production of polymeric membranes for water purification. This study explores the use of high-grade crystalline forms of cellulose as functional materials for active hybrid membranes, which showed high porosity and excellent ion removal performance.
Article
Engineering, Multidisciplinary
Sameer A. Awad, Hassan Fouad, Eman M. Khalaf, N. Saba, Hom N. Dhakal, M. Jawaid, Othman Y. Alothman
Summary: This study investigates the influence of alkali treatment on the properties of pure and hybrid bio-phenolic composites. The results show that alkali treatment improves the interfacial bonding and thermal stability of the composites. It also enhances the mechanical properties, especially the flexural strength.
JOURNAL OF BIONIC ENGINEERING
(2022)
Article
Chemistry, Physical
M. A. Naziruddin, L. K. Kian, M. Jawaid, N. Aziman, N. L. Yusof, N. A. Abdul-Mutalib, M. Sanny, Hassan Fouad, O. A. Tverezovskaya
Summary: In this study, encapsulated Salvia officinalis L. powder (SESP) was developed using supercritical fluid extraction (SFE) and compared to commercial sage powder of hydro-distillation extract (HESP). The results showed that SESP had a larger particle size distribution and contained a greater amount of terpenoids.
JOURNAL OF SUPERCRITICAL FLUIDS
(2022)
Article
Chemistry, Multidisciplinary
Abdul Qayoom Mugheri, Syeda Fatima Qamer, Aijaz Ali Otho, Mohamed H. Mahmoud, Hassan Fouad, M. Shaheer Akhtar
Summary: The study fabricated CoCu oxide functional material on nickel foam with copper nanoparticles using a hydrothermal method. The composite material showed fast electrocatalytic performance and good stability in the oxygen evolution reaction (OER), exhibiting characteristics similar to the precious metal RuO/C. It is abundant in nature, environmentally friendly, cost-effective, and superior for OER activity.
JOURNAL OF THE CHINESE CHEMICAL SOCIETY
(2022)
Article
Oncology
Sukumaran Anil, M. E. Yahia, Majed M. Alsarani, Bader Mohammed Alolayani, Omar Alsadon, Sajith Vellappally, Mohamed Hashem, Hassan Fouad
Summary: This in vitro study assessed the efficacy of antimicrobial photodynamic therapy, Nd:YAG laser, and other disinfectants against P. gingivalis and T. forsythia on zirconia ceramics and their effects on zirconia surface. The results showed that antimicrobial photodynamic therapy had the highest antibacterial efficacy, followed by chlorhexidine and Nd:YAG laser. Hydrogen peroxide had the least effect. Additionally, antimicrobial photodynamic therapy increased the hydrophilicity of the zirconia surface.
PHOTODIAGNOSIS AND PHOTODYNAMIC THERAPY
(2022)
Article
Materials Science, Composites
Bushra Rashid, Mohammad Jawaid, Hassan Fouad, Naheed Saba, Sameer Awad, Eman Khalaf, Mohini Sain
Summary: In this work, thermal analysis was conducted on olive/bamboo fiber-based epoxy hybrid composites. The study found that the incorporation of hybrid fibers improved the thermal stability compared to pure fiber composites. The storage modulus and loss modulus reduced, while the damping factor increased with hybrid fiber composites. Additionally, the OTL-B hybrid composite exhibited a lower coefficient of thermal expansion.
POLYMER COMPOSITES
(2022)
Article
Materials Science, Textiles
M. Jawaid, S. Awad, Hassan Fouad, Othman Y. Alothman, N. Saba, M. Sain, A. L. Leao
Summary: This study evaluates the impact of different olive tree residues on the thermal properties of olive/epoxy biocomposites. The results show that olive tree leaves as a filler improve the thermal and dynamic mechanical properties of the biocomposites. Meanwhile, olive tree small branch-filled biocomposites exhibit the highest storage modulus and lowest coefficient of thermal expansion.
JOURNAL OF NATURAL FIBERS
(2022)
Article
Materials Science, Textiles
Ahmed Belaadi, Salah Amroune, Yasemin Seki, Ozgur Yasin Keskin, Serhan Koktas, Mostefa Bourchak, Alain Dufresne, Hassan Fouad, Mohammad Jawaid
Summary: The present study investigated the properties of Yucca treculeana (YT) fiber for potential use in biodegradable biocomposites. The YT fiber exhibited good thermal stability and mechanical properties, making it suitable for lightweight industrial biocomposites.
JOURNAL OF NATURAL FIBERS
(2022)
Review
Reproductive Biology
Anam Beg, Rafat Parveen, Hassan Fouad, M. E. Yahia, Azza S. Hassanein
Summary: This review highlights the role of different non-coding RNAs as potential biomarkers in the diagnosis of ovarian cancer. It summarizes the expression and clinical features of a few miRNAs involved in epithelial ovarian cancer. Additionally, the abnormal expression of piRNAs has been found to play a crucial regulatory role in cancer cell proliferation, apoptosis, invasion, and migration, while tRFs and tiRNAs hold promise as diagnostic biomarkers and therapeutic targets for cancer.
JOURNAL OF OVARIAN RESEARCH
(2022)
Article
Energy & Fuels
Siti Noorbaini Sarmin, Mohammad Jawaid, Mohamed H. Mahmoud, Naheed Saba, Hassan Fouad, Othman Y. Alothman, Carlo Santulli
Summary: Olive biomass as a reinforcement for polymeric composites has gained attention in the construction industry. It offers cost-effective alternatives and immediate and long-term financial benefits compared to traditional materials. This study compared the mechanical behavior of olive waste/bamboo fiber hybrid composites to olive and bamboo fiber-reinforced epoxy. The hybrid composites showed enhanced mechanical properties and are suitable for load-bearing applications requiring lightweight and high strength, such as floor panels and automotive interior.
BIOMASS CONVERSION AND BIOREFINERY
(2022)
Article
Computer Science, Hardware & Architecture
Ahmed Altameem, Viacheslav Kovtun, Mohammed Al-Ma'aitah, Torki Altameem, H. Fouad, Ahmed E. Youssef
Summary: Medical healthcare services rely on communication technologies for exchanging digital records of patients, and the new digitalizing of health records brings specific changes to healthcare services. This research introduces Healthcare Data Privacy (HDP) through Backpropagation Learning (BL) to improve privacy maintenance in medical healthcare transmission services using wearable devices.
COMPUTERS & ELECTRICAL ENGINEERING
(2022)
Article
Robotics
Hassan Fouad, Giovanni Beltrame
Summary: This work presents an approach based on control barrier functions to enforce energy sufficiency and coordination constraints in battery-powered multirobot systems. The study also investigates the relationship between system capacity and temporal separation requirements within charging cycles.
IEEE TRANSACTIONS ON ROBOTICS
(2022)
