TY - GEN A1 - Fellah, Mamoun A1 - Hezil, Naouel A1 - Hamadi, Fouzia A1 - Iqbal, Amjad A1 - Samad, Mohammed Abdul A1 - Alburaikan, Alhanouf A1 - Khalifa, Hamiden Abd El-Wahed A1 - Obrosov, Aleksei T1 - Effect of Fe content on physical, tribological and photocatalytical properties of Ti-6Al-xFe alloys for biomedical applications T2 - Tribology International N2 - The aim of the current study is to evaluate the effect of iron content (0, 2, 4, 6 and 10 wt%) on the structural, tribological and photocatalytical properties of a nanostructured ternary alloy Ti-6Al-XFe, prepared by high energy milling. The alloys’ characteristics such as lattice parameters, powder morphologies, surface roughness, relative density/porosity, and microhardness, were evaluated using X-ray diffraction (XRD), scanning electron microscope (SEM), surface profilometry, porosimeter and micro durometer, respectively. The W-H method was utilized to determine the crystallite size. Micro strain was also calculated, which is produced in the lattice due to the diffusion of iron atoms. The photocatalytical characterization was conducted by measuring their absorbance as a function of time using spectrophotometer of visible and ultraviolet light in the wavelength range of 500–800 nm. The tribological characterization was performed using an oscillating tribometer under wet conditions, simulating the human body environment using Phosphate Buffered Saline (PBS) solution with neutral pH 7.4, under different applied loads of 2, 6 and 10 N, respectively. Results showed that the addition of Fe has a significant effect on the structural properties of the developed alloys. The lattice parameter (aα) decreased with increasing Fe content from 2.9493 Å (0 wt% Fe) to 2.9491 Å (10 wt% Fe), while the average grain size increased considerably from 6.965 nm (0 wt% Fe) to 44.42 nm (10 wt% Fe). The wear test results showed that, friction coefficient and wear rate considerably decreased due to the formation of protective films such as TiO2. The photocatalytical characterization showed that, the degradation of methylene blue (MB) increased with increasing Fe content. The Ti-6Al-4Fe -catalyst gave the best degree of degradation of 90.76% within 60 min, which meant that the decolorization process could be operated rapidly at a relatively low cost without UV irradiation. KW - Ti-Al-Fe alloys KW - Biomaterials KW - Tribology KW - Biomedical applications KW - Total hip prosthesis KW - Nanoparticle Y1 - 2024 UR - https://www.sciencedirect.com/science/article/pii/S0301679X23009362 U6 - https://doi.org/10.1016/j.triboint.2023.109146 SN - 1879-2464 VL - 191 ER - TY - GEN A1 - Bouras, Dikra A1 - Fellah, Mamoun A1 - Barille, Regis A1 - Weiß, Sabine A1 - Samad, Mohammed Abdul A1 - Alburaikan, Alhanouf A1 - Khalifa, Hamiden Abd El-Wahed A1 - Obrosov, Aleksei T1 - Improvement of photocatalytic performance and sensitive ultraviolet photodetectors using AC-ZnO/ZC-Ag2O/AZ-CuO multilayers nanocomposite prepared by spin coating method T2 - Journal of Science: Advanced Materials and Devices N2 - Morphological and optical properties of a multilayer film (CAZO/CZAO/ZACO) prepared by spin-coating method and deposited on a glass substrate were evaluated. The study was initially carried out for each layer, individually and then as a multilayer subsequently. Structural properties using X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS), infrared spectra (IR) and X-ray photoelectron Spectroscopy (XPS) showed the presence of three phases of zinc, copper and silver oxides at different levels. The CZAO sample observed with scanning electron microscope (SEM) showed an excellent porous surface with a large deformation in the multilayer configuration. Doping with zinc and copper in the silver crystal lattice improved the crystal structure and reduced the optical energy gap, thus increasing the optical absorbance and refractive index. The dielectric constants and showed an increase in the optical polarization values for lower photonic energies. The maximum degradation rate for photocatalysts of methylene blue was 89 % for a 5-h exposure period with CAZO/CZAO/ZACO while it reached 71 % for the CZAO sample during the same time period. The sensitivity of samples to light proved that the presence of ultraviolet radiation increases the number of holes trapped by oxygen ions and causes more free electrons and contribute to a better production of photocurrent than in darkness. KW - Multilayer CAZO/CZAO/ZACO KW - Spin-coating KW - Energy gap KW - Photocatalysis KW - Photodetector KW - Nanostructures KW - Nanocomposites Y1 - 2024 U6 - https://doi.org/10.1016/j.jsamd.2023.100642 SN - 2468-2179 VL - 9 IS - 1 ER - TY - GEN A1 - Hamadi, Fouzia A1 - Fellah, Mamoun A1 - Hezil, Naouel A1 - Bouras, Dikra A1 - Laouini, Salah Eddine A1 - Montagne, Alex A1 - Khalifa, Hamiden Abd El-Wahed A1 - Obrosov, Aleksei A1 - El-Hiti, Gamal A. A1 - Yadav, Krishna Kumar T1 - Effect of milling time on structural, physical and tribological behavior of a newly developed Ti-Nb-Zr alloy for biomedical applications T2 - Advanced Powder Technology N2 - Titanium (Ti)-based alloys with only a β-phase have attracted academic and industrial interest for orthopedic application, due to their close properties to those of tissues. The current study aims to investigate the effect of milling time (2 h, 6 h, 12 h and 18 h) on the nanostructured ternary alloy Ti-25Nb-25Zr prepared by high energy milling, on its structural, physical and tribological behaviors. The alloys’ characteristics such as relative density/porosity, surface roughness, were evaluated using XRD, SEM, surface profilometry, and microdurometer, respectively. The tribological characterization was done using an oscillating tribometer under wet conditions, simulating the human body environment. Results showed that the crystallite and mean pore size reduced with increasing milling time, with the smallest values of 26 nm and 40 µm, respectively after 18 h. Structural characterization shows that the amount of the β-Ti phase increased with increasing milling time, resulting in spherical morphology and texturing of the synthesized alloys. The milled alloys' structural evolution and morphological changes were sensitive to their milling times. Also, the relative density, Young’s modulus and hardness, increased due to grain size decreased with increasing milling time. Tribological results showed that the effect of milling has a significant effect on both nanomaterial formation and friction-wear behavior of the alloys. The results showed that, friction coefficient and wear rate significantly decreased due to the increased formation of protective films such as TiO2, Nb2O5 and ZrO2 phases. The wear mechanism of the Ti-25Zr-25Nb system was dominated by abrasion wear accompanied by adhesion wear. KW - Ti-25Nb-25Zr alloy KW - Biomaterials alloys KW - Total hip prosthesis KW - Milling time KW - Tribology KW - Wear KW - Nanomaterial KW - Nanocomposites Y1 - 2024 UR - https://www.sciencedirect.com/science/article/pii/S0921883123003710 U6 - https://doi.org/https://doi.org/10.1016/j.apt.2023.104306 SN - 1568-5527 VL - 35 IS - 1 ER -