TY - GEN A1 - Fellah, Mamoun A1 - Hezil, Naouel A1 - Djellabi, Ridha A1 - Samad, Mohammed Abdul A1 - Touhami, Mohamed Zine A1 - Montagne, Alex A1 - Iost, Alain A1 - Obrosov, Aleksei A1 - Weiß, Sabine T1 - Rapid and enhanced recovery of poly-dispersed nonionic surfactant (TX-100) from organic mediums using dehydrated and rehydrated kaolin T2 - Applied Clay Science N2 - The recovery of surfactants from organic mediums is of great economic and environmental interests in the field of petrochemicals sector. The aim of this study was to recover poly-dispersed nonionic surfactant (TX-100) from organic medium by the use of dehydrated and rehydrated kaolin. It was found that the presence of water after kaolin rehydration decreases considerably the amount of TX-100 adsorption from 28.7 μmol.g−1 onto dehydrated kaolin to 23.4 μmol.g−1 onto rehydrated kaolin. The estimation of the number of statistical layers of water deposited on kaolin was observed to be about 7 to 9. The effect of type of solvents (heptane, cyclohexane and benzene) on the adsorption onto rehydrated kaolin revealed a reduction in the adsorbed quantity; the adsorbed amounts were found to be 28.7 μmol.g−1, 26.7 μmol.g−1 and 24.2 μmol.g−1 in heptane, cycloheptane and benzene phases, respectively. On the other hand, it was observed that a temperature increased from 20 °C to 35 °C and 45 °C negatively affects the adsorption of TX-100 onto dehydrated and/or hydrated kaolin in heptane medium. KW - Adsorption KW - Organic medium KW - Surfactant recovery KW - Dehydrated/rehydrated kaolin KW - Petrochemical pollution Y1 - 2019 U6 - https://doi.org/10.1016/j.clay.2019.05.004 SN - 0169-1317 VL - 177 SP - 43 EP - 50 ER - TY - GEN A1 - Fellah, Mamoun A1 - Hezil, Naouel A1 - Samad, Mohammed Abdul A1 - Montagne, Alex A1 - Kosman, Stephania A1 - Megias, Alberto A1 - Iost, Alain A1 - Obrosov, Aleksei A1 - Weiß, Sabine T1 - Biotribocorrosion behaviour of newly developed nanostructured near β-types Titanium based Alloys for Biomedical Applications T2 - nanoMAT2019 – 2nd International Conference on Nanomaterials and Their Applications N2 - The biotribocorrosion behavior of newly developed nanocristalline near β-types Ti-15Nb and Ti-15Mo alloys surfaces, sintered by powder metallurgy and sequentially milled, has been investigated in SBF simulated body fluid (PBS solution) at OCP, an applied potential in the passive region and EIS. Reciprocating sliding tests using a ball-on-plate tribometer under differentes applied loads 3, 7 and 10 N load and anodic potentials were applied to evaluate the effect of applied lad and the effect of Nb and Mo elements on tribocorrosion behaviors of samples. Results showed that, Ti-Nb exhibited better anticorrosive properties than Ti-Mo. Under tribological action the nanostructured both of alloys showed similar friction coefficient, while Ti-Nb present lower tendency to corrosion compared to Ti-Mo. Furthermore, Nb diffusion increased the repassivation rate with respect to Ti-Mo surfaces due to its stable passive film. Due to the high chemical reaction rate in β-type Ti-15Mo alloy as compared to Ti-15Nb. The β- Ti-15Nb showed lower volume loss, lower friction coefficient values and exhibited better corrosion resistance during tribocorrosion tests than Ti-15Mo. Prevailing electrochemical conditions between -1 and 2 V influences the wear accelerated corrosion by increasing it with the applied potential and slightly increases the mechanical wear. Also, wear accelerated corrosion can be predicted by existing models as a function of electrochemical and mechanical parameters of the titanium alloys. However, considering biomedical applications, the β- Ti15 Mo and Ti15Nb alloys may be good candidates with low elastic modulus and without toxic alloying elements. KW - Biotribocorrosion KW - titanium based alloys KW - Biomedical Applications Y1 - 2019 UR - http://nanomat2019.org/wp-content/uploads/2019/04/Book-of-Abstracts-nanomath2019.pdf SP - 170 ER - TY - GEN A1 - Fellah, Mamoun A1 - Hezil, Naouel A1 - Samad, Mohammed Abdul A1 - Djellabi, Ridha A1 - Montagne, Alex A1 - Mejias, Alberto A1 - Kossman, Stephania A1 - Iost, Alain A1 - Purnama, Agung A1 - Obrosov, Aleksei A1 - Weiß, Sabine T1 - Effect of Molybdenum Content on Structural, Mechanical, and Tribological Properties of Hot Isostatically Pressed β-Type Titanium Alloys for Orthopedic Applications T2 - Journal of Materials Engineering and Performance N2 - Aiming to develop alloys with better properties for orthopedic applications, the focus of the present research was to evaluate the effect of Mo at.% content on structural, mechanical, and tribological properties of hot isostatically pressed Ti-xMo (x = 4, 8, 12, 15, and 20 at.%) alloys. The structural evolution, mechanical properties, and tribological behavior of the nanostructured Ti-xMo alloys were evaluated using x-ray diffraction, scanning electron microscope, and ball-on-disk tribometer. Wear tests were conducted under different applied loads of 2, 8, and 16 N. Experimental results indicated that the structural evolution and morphological changes of the milled alloys were sensitive to their molybdenum (Mo) content. The morphological characterization showed that the crystallite size and the particle size decreased with increasing Mo content (at.%) reaching the lowest values of 27 and 26 nm in the case of Ti-15Mo and Ti-20Mo, respectively. On the other hand, the coefficient of friction and wear rates were found to be decreasing with increasing Mo content. KW - friction behavior KW - hot isostatic pressing KW - milling KW - nanobiomaterials KW - Ti-Mo alloy KW - β-type titanium alloy KW - tribology KW - wear resistance Y1 - 2019 UR - https://link.springer.com/article/10.1007/s11665-019-04348-w U6 - https://doi.org/10.1007/s11665-019-04348-w SN - 1059-9495 VL - 28 IS - 10 SP - 5988 EP - 5999 ER - TY - GEN A1 - Hezil, Naouel A1 - Fellah, Mamoun A1 - Djellabi, Ridha A1 - Touhami, Mohamed Zine A1 - Montagne, Alex A1 - Bouaksa, Fethia A1 - Iost, Alain A1 - Mejias, Alberto A1 - Obrosov, Aleksei T1 - Assessment of the Hydrophilic-Hydrophobic Balance of Alumina Oxidized at Different Temperatures via H₂O and C₄H₁₀ Vapor Adsorption T2 - Defect and Diffusion Forum N2 - The hydrophilic-hydrophobic surface area of alumina powder (Al₂O₃) oxidized at different temperatures was determined on the base of adsorption of water and butane vapor at 25°C. In the order to study the influence of thermal oxidation upon hydrophilic/hydrophobic character of the surface, samples of Al₂O₃ were characterized using granulometry, SEM and BET surface area measurement. SEM results showed that the thermal treatment does not affect the morphology of the Alunima. However, the increase of treatment temperature from 250 to 900°C results in changing of the hydrophilic-hydrophobic balance of Al₂O₃ surface. KW - Adsorption KW - Alumina KW - Heterogeneity KW - Hydrophilic-Hydrophobic Balance KW - Surface Area KW - Thermal Treatment Y1 - 2019 UR - https://www.scientific.net/DDF.397.161 U6 - https://doi.org/10.4028/www.scientific.net/DDF.397.161 SN - 1662-9507 VL - 397 SP - 161 EP - 168 ER - TY - GEN A1 - Fellah, Mamoun A1 - Hezil, Naouel A1 - Samad, Mohammed Abdul A1 - Touhami, Mohamed Zine A1 - Montagne, Alex A1 - Iost, Alain A1 - Obrosov, Aleksei A1 - Weiß, Sabine T1 - Preliminary investigation on the bio-tribocorrosion behavior of porous nanostructured β-type titanium based biomedical alloys T2 - Materials Letters N2 - The bio-tribocorrosion behavior of newly developed near β-types Ti-15Nb and Ti-15Mo alloys was investigated in Phosphate-Buffered Saline (PBS) under different loads. Open-Circuit Potential (OCP), friction coefficient, wear volume and wear rate were evaluated. The results revealed that Ti-15Nb alloy exhibited lower wear rate, lower friction coefficient and better corrosion resistance during tribocorrosion than the Ti-15Mo alloy. This can be attributed to the diffusion of Nb which increases the repassivation rate (formation of a protective layer) in the Ti-15Nb alloy. In contrast Ti-15Mo shows a significantly higher rate of chemical reaction. KW - Ti-15Mo KW - Ti-15Nb KW - Corrosion KW - Bio-tribocorrosion KW - Biomaterials Y1 - 2019 UR - https://www.sciencedirect.com/science/article/pii/S0167577X19313862 U6 - https://doi.org/10.1016/j.matlet.2019.126755 SN - 0167-577X VL - 257 ER - TY - GEN A1 - Fellah, Mamoun A1 - Hezil, Naouel A1 - Touhami, Mohamed Zine A1 - Obrosov, Aleksei A1 - Weiß, Sabine A1 - Kashkarov, Egor B. A1 - Lider, Andrey M. A1 - Montagne, Alex A1 - Iost, Alain T1 - Enhanced Structural and Tribological Performance of Nanostructured Ti–15Nb Alloy for Biomedical Applications T2 - Results in Physics N2 - Low modulus β-type Ti-15Nb alloys were prepared by subjecting them to different sintering temperatures (800, 900, 1000 and 1100 °C) and their morphological and structural properties were evaluated. X-ray diffraction analysis was used for the morphological characterization which indicated that the mean pore and crystallite size continuously decreased with increasing sintering temperature to reach the lowest values of 41 nm and 27.5 nm at 1100 °C, respectively. Moreover, the higher sintering temperature resulted in higher relative density, greater hardness and young’s modulus of the Ti-15Nb alloys. Wear tests were conducted using a ball-on-plate type Oscillating tribometer, under different applied loads (2, 8 and 16 N) to evaluate their tribological characterization. The wear rate and friction coefficient were lower at higher sintering temperature. This enhancement in tribological properties was attributed to a grain refinement. The Ti-15Nb alloys sintered at 1100 °C showed the best tribological performance. KW - Tribological properties KW - Sintering KW - Biomaterial KW - β-Ti Alloys KW - Ti-15Nb alloys KW - Milling Y1 - 2019 UR - https://www.sciencedirect.com/science/article/pii/S2211379719300506 U6 - https://doi.org/10.1016/j.rinp.2019.102767 SN - 2211-3797 VL - 15 ER - TY - GEN A1 - Fellah, Mamoun A1 - Hezil, Naouel A1 - Touhami, Mohamed Zine A1 - Hussien, Mohammed A. A1 - Montagne, Alex A1 - Mejias, Alberto A1 - Iost, Alain A1 - Kossman, Stephania A1 - Chekalkin, Timofey A1 - Obrosov, Aleksei A1 - Weiß, Sabine T1 - Effect of Sintering Temperature on Mechanical and Tribological Behavior of Ti–Ni Alloy for Biomedical Applications T2 - TMS 2020 149th Annual Meeting & Exhibition Supplemental Proceedings N2 - Ti–Ni powder compacts were prepared by mechanical alloying (MA), followed by hot isostatic pressing (HIP). Afterwards, the samples were sintered at different temperatures (950, 1050, 1150 and 1250 °C). Microhardness, density, crystallite size as well as microstrain of the sintered samples were measured and analyzed. Wear characteristics in phosphate-buffered saline (PBS) solution was tested under different applied loads of 2 N, 10 N, and 20 N, respectively. The results indicated that the crystallite size continuously decreases with increasing sintering temperature and reaches the lowest value of 31.3 nm at 1250 °C. The relative density of the sample sintered at 1250 °C is 98.0%. Moreover, the higher sintering temperatures lead to the higher relative density and the increase in hardness and young’s modulus of the sample. At the same time the friction coefficient and wear rate were lower for the samples sintered at 1250 °C. This improvement in friction and wear resistance is attributed to the grain size refinement. Ti–Ni sintered at 1250 °C showed good tribological performance under all test conditions. KW - Ti–Ni KW - Nanobiomaterials KW - Tribological behaviour KW - Sintering KW - Biomedical applications Y1 - 2020 SN - 978-3-030-36295-9 SN - 978-3-030-36296-6 U6 - https://doi.org/10.1007/978-3-030-36296-6_157 SN - 2367-1181 SN - 2367-1696 SP - 1701 EP - 1710 PB - Springer CY - Cham ER - TY - GEN A1 - Fellah, Mamoun A1 - Hezil, Naouel A1 - Guerfi, Kamel A1 - Djellabi, Ridha A1 - Montagne, Alex A1 - Iost, Alain A1 - Borodin, Kirill A1 - Obrosov, Aleksei T1 - Mechanistic pathways of cationic and anionic surfactants sorption by kaolinite in water T2 - Environmental Science and Pollution Research N2 - Surfactants are widely used in many chemical industries and as primary components of cleaning detergents due to their specific characteristics, which in turn results in high pollution of domestic and industrial wastewaters by such substances. In this study, the mechanistic pathways of the adsorption of cationic benzyl-dimethyl-dodecyl ammonium bromide (BDDAB) and anionic sodium dodecyl sulfate (SDS) surfactants on kaolinite clay in water were investigated. The results showed that the adsorption of anionic surfactant (SDS) on kaolinite is better compared with cationic surfactant (BDDAB), wherein the ♦maximum adsorption capacity was found 161.4 μmol g−1 and 234 μmol g−1 for BDDAB and SDS, respectively. Adsorption kinetics were the best suited to pseudo-second-order model for both BDDAB and SDS with an adsorption rate constant of 0.028 g μmol−1 min−1 and 0.023 g μmol−1 min−1, respectively. Meanwhile, the adsorption of BDDAB by kaolinite showed that the isotherm adsorption tended to follow the Langmuir-Freundlich and Freundlich isotherm models. However, the SDS adsorption isotherm obeyed only the Langmuir-Freundlich model. KW - Surfactant KW - Adsorption KW - Kaolinite KW - Water remediation KW - Adsorption modeling Y1 - 2021 UR - https://link.springer.com/article/10.1007/s11356-020-11083-6 U6 - https://doi.org/10.1007/s11356-020-11083-6 SN - 1614-7499 VL - 28 IS - 6 SP - 7307 EP - 7321 ER - TY - GEN A1 - Fouzia, Hammadi A1 - Fellah, Mamoun A1 - Hezil, Naouel A1 - Aissani, Linda A1 - Mimanne, Goussem A1 - Mechachti, Said A1 - Samad, Mohammed Abdul A1 - Montagne, Alex A1 - Iost, Alain A1 - Weiß, Sabine A1 - Obrosov, Aleksei T1 - The effect of milling time on the microstructure and mechanical properties of Ti-6Al-4Fe alloys T2 - Materials Today Communications N2 - Replacement of toxic and expensive vanadium (V) in medical grade titanium alloys with cheaper and non-toxic elements such as iron (Fe) or niobium (Nb), is an important step forward in developing safer and less expensive biomaterials. Evaluating the effect of different process parameters such as the milling time on the properties of these newly developed alloys helps in understanding and controlling their behavior. Hence, in this study, the influence of ball-milling duration (2, 6, 8, 12 and 18 h) on crystalline structure, phase evolution, densification, and mechanical characteristics of biomedical nanocrystalline Ti-6Al-4Fe (wt. %) alloys is investigated. X-ray diffraction (XRD) confirmed that after 6 h of milling, aluminum (Al) and Fe completely dissolved into Ti matrix to form a solid solution of Ti (Al, Fe). XRD further revealed that the crystallite size decreased from 56 to 30 nm and the micro-strain increased with an increase in milling time. A decrease in porosity along with an increase in density is also observed for the alloys with increasing milling time. Moreover, the values of porosity obtained for the developed Ti-6Al-4Fe alloys ranged from 1 to 12 %, which is comparable to the porosity of one of the cortical bones making it a potential candidate for bone replacements. Microhardness measurements showed that the hardness of the Ti-6Al-4Fe alloys was greater than the hardness of the conventional Ti-6Al-4V alloys. It was observed that the Ti-6Al-4Fe alloy fabricated with the powders milled for 2 h showed the lowest value of Young’s Modulus. Milling time also had a significant effect on the surface roughness of the alloy samples, which showed a decreasing trend with increasing milling times. KW - Ti-based alloys KW - Microstructure KW - Mechanical properties KW - Ball-milling KW - Biomaterials KW - Milling time Y1 - 2021 UR - https://www.sciencedirect.com/science/article/abs/pii/S2352492821004207#! U6 - https://doi.org/10.1016/j.mtcomm.2021.102428 SN - 2352-4928 VL - 27 ER - TY - GEN A1 - Bouaksa, Fethia A1 - Fellah, Mamoun A1 - Hezil, Naouel A1 - Djellabi, Ridha A1 - Touhami, Mohamed Zine A1 - Iost, Alain A1 - Montagne, Alex A1 - Kosman, Stephania A1 - Weiß, Sabine T1 - Effect of Thermocyclic Treatment with Different Cooling Rates on the Mechanical Characteristics of 42CD4 Low-Alloy Steel T2 - Defect and Diffusion Forum N2 - The aim of this study was to investigate the influence of thermo-cyclic treatments on the mechanical characteristics (Hardness and Resilience) of low-alloy 42CD4 steel. Thermocyclic treatment on 42CD4 steel was operated for four cycles at 850 °C for 30 min. After each cycle, the steel sample was cooled in different medium (open air and water) in order to check the effect of the cooling rate on the microstructure characteristics. It was found that the cooling rate can affect the mechanical characteristics of the steel. The hardness values of steel cooled in water were higher than those of steel cooled in air. Additionally, there was an increase in the resilience of steel sample with the increase of thermocyclic number. KW - Austenization KW - Grain Refinement KW - Grain Size KW - Hardness KW - Resilience KW - Thermocyclic Y1 - 2019 UR - https://www.scientific.net/DDF.397.169 U6 - https://doi.org/10.4028/www.scientific.net/DDF.397.169 SN - 1662-9507 VL - 397 SP - 169 EP - 178 ER - TY - GEN A1 - Fellah, Mamoun A1 - Hezil, Naouel A1 - Touhami, Mohamed Zine A1 - Samad, Mohammed Abdul A1 - Obrosov, Aleksei A1 - Bokov, Dmitry O. A1 - Marchenko, Ekaterina A1 - Montagne, Alex A1 - Iost, Alain A1 - Alhussein, Akram T1 - Structural, tribological and antibacterial properties of (α + β) based ti-alloys for biomedical applications T2 - Journal of Materials Research and Technology N2 - Implant-related follow up complications resulting from poor implant integration, delamination, chipping, mechanical instability, inflammation or graft-vs-host reaction may lead to low patient tolerance, prolonged care and sometimes leading to a second surgery. Hence, there is an urgent need for developing biomaterials which will help to overcome the above compatibility problems. Ti based alloys have been widely used for biomedical applications, due to their excellent properties, such as low modulus, high biocompatibility and high corrosion resistance. In order to further improve the physical, mechanical and tribological properties of these alloys, microstructural modification is often required. Hence, this study aims to develop and evaluate the structural and tribological behavior of Hot Isostatic Pressed (HIPed) and sintered Ti-6Al-7Nb samples containing niobium, which is less toxic and less expensive as compared to the usual alloying element, vanadium (Ti-6Al-4 V). The Ti-6Al-7Nb alloys were fabricated by using nanoparticle powders milled for different durations (2, 6, 12 and 18 h) to evaluate the effect of milling time on the morphological and structural properties. Friction and wear tests were carried out on the (HIPed) and finally sintered Ti-6Al-7Nb alloy samples, to evaluate their tribological properties under different applied loads (2, 8 and 16 N), with an alumina α-Al2O3 ball as a counter face using an oscillating tribometer. The physical characterization of the nanopowders formed using different milling times indicated that the particle and crystallite size continually decreased with increasing milling time, while the microstrain increased. It is observed that the friction coefficient and wear rate for the samples prepared by powders milled for 18 h and tested under 2 N were lowest with values of 0.25 and 1.51 × 10−2 μm3∙N-1 μm-1, respectively compared to other milled samples. This improvement in tribological properties is attributed to the grain refinement at high milling times. The antibacterial evaluation of the fabricated alloys showed an improvement in antibacterial performance of the samples milled at 18 h compared to the other milling times. KW - Mechanical properties KW - Hot Isostatic Pressure KW - Ti-6Al-7Nb KW - Powder metallurgy KW - Milling time KW - Physical characterization KW - biomaterials KW - microstructure Y1 - 2020 UR - https://www.sciencedirect.com/science/article/pii/S2238785420318421 U6 - https://doi.org/10.1016/j.jmrt.2020.09.118 SN - 2238-7854 VL - 9 IS - 6 SP - 14061 EP - 14074 ER - TY - CHAP A1 - Fellah, Mamoun A1 - Hezil, Naouel A1 - Abderrahim, Karima A1 - Samad, Mohammed Abdul A1 - Montagne, Alex A1 - Mejias, Alberto A1 - Iost, Alain A1 - Kossman, Stephania A1 - Chekalkin, Timofey A1 - Obrosov, Aleksei A1 - Weiß, Sabine T1 - Investigating the Effect of Sintering Temperature on Structural and Tribological Properties of a Nanostructured Ti–20Nb–13Zr Alloy for Biomedical Applications T2 - Characterization of Minerals, Metals, and Materials N2 - β-type Ti–20Nb–13Zr alloys with low Young’s modulus were prepared at different sintering temperatures (950, 1050, 1150, and 1250 °C). The morphological and structural characteristics of as-prepared samples were investigated by several methods. Wear tests were conducted using a ball-on-plate type oscillating tribometer under different applied loads (2, 10, and 20 N). The morphological characterization indicated that the mean pore and crystallite size continuously decreased with increasing sintering temperature to reach lowest values of 40 nm and 38 nm at 1250 °C, respectively. The relative density of the 1250 °C sintered sample was as high as 98.7%. Moreover, the higher sintering temperature resulted in higher relative density and closed porosity of the sample. Both the friction coefficient and wear rate were lower in the sample sintered at 1250 °C as compared to other samples. This enhancement in tribological properties was attributed to a closed porosity. KW - Ti-20Nb-13Zr KW - Nanobiomaterials KW - Tribological behaviour KW - Nanotribology KW - Sintering KW - Biomedical applications Y1 - 2020 SN - 978-3-030-36628-5 SN - 978-3-030-36627-8 U6 - https://doi.org/10.1007/978-3-030-36628-5_61 SN - 2367-1181 SN - 2367-1696 SP - 619 EP - 629 PB - Springer CY - Cham ER - TY - GEN A1 - Hezil, Naouel A1 - Fellah, Mamoun A1 - Montagne, Alex A1 - Iost, Alain A1 - Obrosov, Aleksei A1 - Weiß, Sabine T1 - Removal of Chromium (VI) from Water onto Activated Carbon by Adsorption in Dynamic Mode T2 - TMS 2020 149th Annual Meeting & Exhibition Supplemental Proceedings N2 - Hexavalent chromium pollution from industrial waste water is a serious problem as it can cause adverse effects on the environment. Several methods are used to reduce the harmful effects of this pollutant, especially physico-chemical methods, such as adsorption technology. The present study aims to remove Cr (VI) from industrial sources in a fixed-bed column of activated carbon. The experiments were carried out at natural pH and temperature with a flow rate (5, 10, and 20 mL/min) and bed height (3.5 cm). Breakthrough curves for feed concentrations (0.01, 0.03, and 0.05 mol/L) were investigated. The results indicated a marked decrease up to 99%. The value of the flow constant for the Thomas model decreased with the increase in the concentration of the incoming substance, but increased with the increase in the flow rate. KW - Hexavalent chromium KW - Activated carbon KW - Adsorption KW - Breakthrough curve KW - Fixed-bed column Y1 - 2020 SN - 978-3-030-36295-9 SN - 978-3-030-36296-6 U6 - https://doi.org/https://doi.org/10.1007/978-3-030-36296-6_80 SN - 2367-1181 SN - 2367-1696 SP - 855 EP - 863 PB - Springer CY - Cham ER - TY - GEN A1 - Fellah, Mamoun A1 - Hezil, Naouel A1 - Dekhil, Leila A1 - Samad, Mohammed Abdul A1 - Djellabi, Ridha A1 - Kosman, Stephania A1 - Montagne, Alex A1 - Iost, Alain A1 - Obrosov, Aleksei A1 - Weiß, Sabine T1 - Effect of sintering temperature on structure and tribological properties of nanostructured Ti–15Mo alloy for biomedical applications T2 - Transactions of Nonferrous Metals Society of China N2 - The effect of sintering temperature (1073–1373 K) on the structural and tribological properties of nanostructured ball-milled β-type Ti–15Mo samples was investigated. The prepared samples were characterized using various apperatus such as X-ray diffractometer, scanning electron microscope (SEM) and ball-on-plate type oscillating tribometer. Wear tests were conducted under different applied loads (2, 8 and 16 N). Structural results showed that the mean pore and crystallite size continuously decreased with increasing sintering temperature to reach the lowest values of 4 nm and 29 nm at 1373 K, respectively. The relative density of the sintered sample at 1373 K was as high as 97.0%. Moreover, a higher sintering temperature resulted in higher relative density, greater hardness and elastic modulus of the sample. It was observed that both the friction coefficient and wear rate were lower in the sample sintered at 1373 K which was attributed to the closed porosity. KW - Ti–15Mo KW - wear KW - tribological behaviour KW - nanotribology KW - sintering KW - biomedical applications Y1 - 2019 UR - https://www.sciencedirect.com/science/article/pii/S100363261965137X#! U6 - https://doi.org/10.1016/S1003-6326(19)65137-X SN - 1003-6326 VL - 29 IS - 11 SP - 2310 EP - 2320 ER - TY - GEN A1 - Khalil, S. A1 - Fellah, Mamoun A1 - Hezil, Naouel A1 - Smata, L. A1 - Montagne, Alex A1 - Mejias, Alberto A1 - Kossman, Stephania A1 - Iost, Alain A1 - Obrosov, Aleksei A1 - Weiß, Sabine T1 - Synthèse et caractérisation structurale d’un composé nanostructuré de Ti, Mo et Zr pour applications biomédicales T2 - 3rd International Conference on Mechanics and Materials : ICMM’2019 11-12 November 2019. Setif, Algeria, Abstracts book N2 - Le milieu médical est un perpétuel demandeur de biomatériaux compatibles surtout en orthopédie. Effectivement le nombre important d’arthroplasties effectuées chaque année ne cesse d’augmenter dans le monde, non seulement du fait vieillissement de la population (à partir de 65 ans), mais aussi de demandes de patients plus jeunes entre 45 ans et 55 ans. Actuellement, les composés à base de titane Ti sont largement utilisés comme des biomatériaux pour leur biocompatibilité, leur résistance à la corrosion et leur faible module d’élasticité. Le molybdène et le zirconium sont parmi les meilleurs éléments alliés parce qu’ils sont non toxiques et non allergiques et offrent d’excellentes propriétés. De plus,Le Zr peut augmenter la trempabilité et la résistance à la corrosion de l'alliage . Mo est un élément fort stabilisant pour la phase des alliages de titane et les alliages à base de Ti-Mo présentent des propriétés mécaniques adéquates compatibilité et bonne cyto-compatibilité . Par conséquent, le système Ti-Mo-Zr, qui a montré une bonnes performances et de magnifiques perspectives dans l’application de biomatériaux, a été intensivementétudié [1,2,3]. Cependant, les alliages de Ti largement utilisés, tels que les interstitiels extra-low (ELI) Ti-6Al-4V (wt.% en poids ), Ti- 5Al-2,5 Fe et Ti-6Al-7Nb, ont le risque de libérer de l'aluminium toxique (Al) et les Ions de vanadium (V) in vivo, ce qui peut causer des problèmes de santé, comme la maladie d’Alzheimer et la neuropathie[4].La métallurgie des poudres (MP), y compris la méthode de mixture des composants en poudre, qui consiste à fritter titane en poudre ou ses mélanges avec d’autres composants en poudre, est un procédé économique à moindre cout. La nanotechnologie est intervenue dans la structuration des biomatériaux à l’échelle nanométrique (entre1nmet 100 nm) par soucis d’amélioration des propriétés mécanique surtout le module de Young. KW - Biomatériaux, KW - Ti-Mo-Zr KW - nanomatériaux KW - caractérisation structurale KW - broyage mécanique Y1 - 2019 UR - https://drive.google.com/file/d/1XCFz_8p3aAacxwT1bWgK_rljAL5_oEXS/view SP - 243 EP - 244 CY - Setif, Algeria ER - TY - GEN A1 - Fellah, Mamoun A1 - Hezil, Naouel A1 - Dekhil, Leila A1 - Samad, Mohammed Abdul A1 - Montagne, Alex A1 - Mejias, Alberto A1 - Iost, Alain A1 - Obrosov, Aleksei A1 - Weiß, Sabine T1 - Structural characterization of developed near β-Type Titanium Alloys (Ti-25NbxZr) for biomedical Applications T2 - 3rd International Conference on Mechanics and Materials : ICMM’2019 11-12 November 2019. Setif, Algeria, Abstracts book N2 - The osteoarthritis and degenerative diseases osteoporosis as well as trauma lead to the bone mechanical properties degradation due to absence of normal biological self healing processes or excessive loading [1–5]. These problems solution are artificial biomaterials, as surgical implantation of appropriate shapes helps restore function for the otherwise functionally compromised structures [1–5]. Biocompatibility is considered to be optimal once tissue neoformation and later function occurs around implantable devices [6]. The efficacy of biomaterials implants is determined mostly by their surface characteristics such as microstructure, surface morphology, composition and biological properties [2]. Aiming to develop alloys with better properties for orthopedic applications, the focus of the present research was to evaluate the effect of Zr at. % content on structural, mechanical and tribological properties of hot isostatically pressed Ti-25Nb-xZr (x = 5, 10, 15, 20 and 25 at. %) alloys. The structural evolution, and mechanical properties of the nanostructured Ti-Nb-xZr alloys were evaluated using X-Ray diffraction, scanning electron microscope. The mechanical properties were performed using Vickers hardness and berkovich nanoindentation. Experimental results indicated that the structural evolution and morphological changes of the milled alloys were sensitive to their Zirconium (at. %) content. The morphological characterization showed that the crystallite size and the particle size decreased with increasing Zr content (at. %). As well, as the Zr was added to the Ti-25NbXZr system, there was a clear decrease in the Vickers hardness and young’s modulus. On the other hand, the coefficient of friction and wear rates were found to be decreasing with increasing Zr content. KW - Ti-Nb-Zr alloys KW - Nanobiomaterials KW - tribological behaviour KW - Sintering KW - Biomedical applications Y1 - 2019 UR - https://drive.google.com/file/d/1XCFz_8p3aAacxwT1bWgK_rljAL5_oEXS/view SP - 224 EP - 225 CY - Setif, Algeria ER - TY - GEN A1 - Hazil, Naouel A1 - Fellah, Mamoun A1 - Montagne, Alex A1 - Iost, Alain A1 - Obrosov, Aleksei A1 - Weiß, Sabine T1 - Study of the photocatalytic degradation of Orange methyl dye in the presence of titanium dioxide T2 - La Troisième Conférence Méditerranéenne de la Biodiversité 2019 (BIODIV 2019) N2 - The use of photocatalytic techniques for water purification and wastewater treatment is very widespread, in our work we used TiO2 to photocatalyrate orange methyl (MO). In addition, the effects of some parameters on photodegradation of MO have been studied, such as the presence and / or absence of light (UV). The use of TiO2 showed a high MO degradation efficiency of up to 98%. The presence of H2O2 in the photocatalytic reaction may favor the photocatalytic degradation efficiencies. In addition, the experimental results have demonstrated an excellent rate of the order of 99%. KW - Titanium Dioxide KW - Photocatalytic Degradation Y1 - 2019 UR - http://ascob.net/files/abstract_book_biodiv2019_finale.pdf SP - 105 PB - L’ASCOB-SYRTIS CY - Hammamet, Tunisie ER -