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Go to Editorial ManagerThe microstructural analysis and electrochemical measurements tests were used to investigate the behaviors of (TiO2) and (HAp)-coated Ti-6Al-7Nb alloy in the SBF solution .By using RF sputtering, a thin TiO2 layer coated the substrate, while a thick layer of HAp coated the outer side of surface. The generated middle layer consist of the composite of TiO2 and HAp which is by AFM characterized as uniformly distributed coating system with nano size. The images of the scan electron microscopy (SEM) shows that there is no any cracking observed in the outer layer of tested samples due to the use of thin film TiO2 as mid lead to reduce the difference in the thermal expansion between the HAp material and Ti-6Al-7Nb substrate .The HAp upper layer significantly improve the bioactivity of the Ti-6Al-7Nb alloy. In this study, the bonding strength and the corrosion resistance was improved by using thin layer of TiO2. From electrochemical impedance spectroscopy (EIS) study Bod plot, the composite layer of TiO2 and HAp was suggested by the capacitive act as barrier layer coated substrate and prevent the relays of the ion from metallic. The results shows the values of Rox (309.2 k? cm2)are greater than for Rct(19.2 k? cm2), by assumes the presence oxide film increases for coated substrate are greater than that of uncoated, which is a result of the presence of coated film that improve the corrosion resistance of the sample.
Laser annealing represents a powerful method for tailoring the properties of silver nanofilms on quartz substrates, offering advantages in terms of precision, scalability, and functionalization. Continued research efforts are expected to deepen our understanding and broaden the applications of this promising technology in diverse fields. In this work, laser annealing of silver nanofilms deposited on quartz substrates was performed and investigated. RF CO2 laser of variable power in the range 1–20 W with beam quality of 1.1 was used to anneal silver nanofilms. AFM analysis emphasized that nanocrystal sizes of 60 nm were obtained for silver nanofilms. Furthermore, the optimum absorbance peak occurred at about 449 nm for smaller film thickness. Thermal simulation and analysis of the annealing process were also conducted using COMSOL Multiphysics software. It was observed that optimal temperature of 729 K was achieved when 10 W laser power and 2 mm/s scanning speed were used to anneal 20 nm silver film thickness. Design of expert analysis was also used to better understand the laser annealing process of silver nanofilms since convolution of several process parameters affect the process output.
The use of polymers to modify asphalt binder properties in road paving has been increased over the past few decades, producing asphalt mixes that can withstand the growth in traffic load concurrent with development. Therefore, the use of modified asphalt binders has become increasingly popular in recent years to enhance the properties of pavement roads by incorporating various materials, including sustainable ones. This study was conducted as part of a larger study for enhancing asphalt binder properties by using 1%, 2%, 3%, and 4% of sasobit (S) as a warm mix asphalt additive and 1%, 2%, 3%, and 4% of low-density polyethylene (L) as sustainable materials and the mix combination (MC) of both of them. The performance of the treated bitumen was evaluated using conventional tests, including penetration, softening point, and ductility, to assess the physical properties of the mixtures. More advanced tests, including a dynamic shear rheometer (DSR) and a rolling thin film oven test (RTFOT), were conducted. The results show that 4% of Sasobit and 1% of LDPE achieved the optimal values, which significantly enhances the performance of asphalt binders, offering a synergistic blend of sustainability and functionality. LDPE improves the binder’s elasticity and resistance to deformation, while Sasobit lowers mixing and compaction temperatures, boosting workability and energy efficiency. Their combination increases the softening point and reduces penetration and ductility, indicating better high-temperature performance. Viscosity is notably reduced, facilitating easier handling and mixing. Moreover, Sasobit enhances the binder’s resistance to thermo-oxidative aging, with improved ductility retention and thermal stability. The study concluded that using Sasobit and LDPE results in high-performance and durable asphalt mixes that may be highly resistant to permanent deformation and temperature susceptibility.