This work aims to deposit silica (SiO2) on polyamide 6,6 fabrics by hybrid corona-dielectric barrier discharge plasma at atmospheric pressure. The reactor used, developed at the Laboratory of Plasma and Processes of the Aeronautics Institute of Technology (LPP/ITA), allows the treatment of fabric surfaces by activation and plasma deposition processes, aiming, in this order, the alteration of wettability and the deposition of silica on its surface, using a silicic acid solution (Si(OH)4) as a silica precursor. The morphology of the deposited films was evaluated by scanning electron microscopy (SEM). To identify the chemical modifications generated by the plasma treatment, the untreated and treated samples were analyzed by Fourier transform infrared spectroscopy with attenuated reflectance (FTIR-ATR) and Energy Dispersive Spectroscopy (EDS). The thermal behavior of the treated and untreated samples was evaluated by Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). Additionally, X-ray diffraction (XRD) was also used to identify crystalline phases in the film. The results showed that plasma processing proved to be an effective technique for modifying the surface characteristics of polyamide 6,6.

This study presents a detailed analysis of the feasibility of Ti-15Mo alloy for coronary stents by independently applying the TOPSIS and RADAR multi-parameter selection methods independently and comparing the results obtained. The research focused on evaluating β-metastable titanium alloys for use in coronary stents, employing the TOPSIS and RADAR methods for a comprehensive and independent analysis. The independent application of these methods enabled for a robust and detailed comparison between different candidate materials, considering crucial criteria such as mechanical strength, biocompatibility, and cost-effectiveness. The results showed that the Ti-15Mo alloy excelled in terms of safety and mechanical performance in both methodologies, offering a combination of mechanical properties and biological compatibility suitable for this application. Compared to 316L stainless steel and Co-Cr L605, Ti-15Mo consistently outperformed across multiple criteria. This study positions Ti-15Mo as a promising candidate for coronary stents and emphasizes the effectiveness of combining TOPSIS and RADAR methodologies for comprehensive material selection in biomedical applications. The research underscores the importance of detailed and methodological evaluation to optimize the performance and safety of advanced biomedical devices.

Membrane technology offers solutions for separation of complex gas mixtures. Therefore, new efficient and durable membranes are required to produce gas permeation modules with high area/volume for CO2 removal from natural gas. This study aims to develop cost-effective zeolite DD3R alumina composite hollow fibers to achieve these process requirements. A porous hollow fiber support from low-cost alumina was prepared via phase inversion followed by thermal treatment. DD3R zeolite seeds were then implanted over the surface of the microporous hollow fibers to form a selective layer by hydrothermal synthesis. The thickness of the selective layer was controlled by the seed concentration, which also affected the crystal intergrowth and competing zeolite phase formation, Sigma-2, which influenced the membrane performance. A reduced-diameter composite DD3R-alumina hollow fiber was obtained with a selectivity of 203 and a CO2 permeance of 5.4 x 10-8 mol m−2 s−1 Pa−1 at a pressure of 2 bar. mixtures Therefore areavolume area volume CO costeffective cost effective DDR DD R requirements lowcost low treatment synthesis concentration formation Sigma2, Sigma2 Sigma 2, Sigma-2 performance reduceddiameter reduced diameter DD3Ralumina DDRalumina 20 54 5 4 5. 108 10 8 10- m2 m m− s1 s 1 s− Pa1 Pa Pa− bar Sigma- Ralumina

In the present work, synthetic slags (FeO-SiO2-CaO-P2O5-Al2O3-TiO2-V2O5 system) mimicking the composition of the slag inclusions of Ipanema were solidified at different cooling rates. FactSage software was used to calculate the slag’s phase equilibria from 500ºC to 1600°C to guide the microstructural characterisation. The samples solidified with slower cooling rates featured wüstite dendrites and a eutectic-like matrix, with intradendritic (Al,V,Ti)-containing iron spinel precipitates in the wüstite. The rapidly solidified slag showed refined wüstite dendrites surrounded by a Fe-O-Si-Ca-containing amorphous single-phase matrix without intradendritic (Al,V,Ti)-containing iron spinel precipitation. The comparison of the calculated phase diagram with the as-cast microstructures showed a few discrepancies. For instance, the FactSage’s database must be updated to consider the simultaneous solubility of Al, V and Ti in the thermodynamic description of the spinel phases, such as FToxid-SP-V, FToxid-SPINA, FToxid-TiSp and (FeO)2(TiO2)(s). Finally, the intradendritic precipitation of (Al,V,Ti)-containing iron spinel phases in the wüstite of the slag inclusions indicated that an Ipanema’s iron artefact was exposed to high service temperatures between 750 and 1050ºC. work FeOSiO2CaOP2O5Al2O3TiO2V2O5 FeOSiOCaOPOAlOTiOVO FeO SiO2 CaO P2O5 Al2O3 TiO2 V2O5 SiO P O Al TiO (FeO-SiO2-CaO-P2O5-Al2O3-TiO2-V2O system s ºC 1600C C 1600 characterisation eutecticlike eutectic like Al,V,Ticontaining AlVTicontaining Al,V,Ti containing FeOSiCacontaining Fe Si Ca singlephase single ascast cast discrepancies instance FactSages FToxidSPV, FToxidSPV FToxid SP V, FToxid-SP-V FToxidSPINA, FToxidSPINA SPINA, SPINA FToxid-SPINA FToxidTiSp TiSp FeO2TiO2s. FeO2TiO2s FeOTiOs 2 . (FeO)2(TiO2)(s) Finally Ipanemas 75 1050ºC FeOSiO CaOP FeOSiO2CaOP2O5Al2O3TiO2V2O PO P2O AlO Al2O VO V2O 160 Ticontaining AlVTi (FeO)2(TiO2)(s 7 16 1

Double-layer Ni-P coatings with low phosphorus content in the inner layer and high phosphorus content in the outer layer and Ni-Mo-P composite coatings are successfully prepared on the surface of AZ91D magnesium alloy by chemical plating process. The microstructures, friction and corrosion resistance of double-layer Ni-P and Ni-Mo-P coatings are studied in comparison. Meanwhile, the deposition and corrosion resistance mechanism for the coatings are investigated. Results convey that both Ni-P and Ni-Mo-P coatings showcase an amorphous structure. The coating possesses denser and more homogeneous structure with the co-doping of Mo. The micro-indentation hardness (859.7 HV) and friction coefficient (0.58) of Ni-Mo-P coatings show that the ternary alloy coating is firmly bonded to the magnesium alloy substrate. Besides, the Ni-Mo-P coatings demonstrate exceptional wear resistance attributed to Mo co-deposition, fostering grain refinement and facilitating the growth of passivation films. Doublelayer Double NiP Ni P NiMoP AZD AZ D process microstructures doublelayer double comparison Meanwhile investigated codoping co doping microindentation micro indentation 859.7 8597 859 7 (859. HV 0.58 058 0 58 (0.58 substrate Besides codeposition, codeposition deposition, co-deposition films 859. 85 (859 0.5 05 5 (0.5 8 (85 0. (0. (8 (0 (

Ti alloys have been developing through the years, aiming the biomedical application since it has suitable properties. Among Ti alloys, the Ti-Nb systems are a pronounced group to biomedical applications due to its low elastic modulus, good corrosion resistance, and mechanical properties. Although this system is quite well-known regarding its phases, structure and properties, there is not plenty of information about wear available in the literature. To investigate the wear resistance, the samples were submitted to x-ray diffraction (XRD) and scanning electron microscopy (SEM) to analyze the phases formed. Hardness and elastic modulus were measured by microhardness Vickers and dynamic Young modulus by excitation impulse. Additionally, wear volume, wear resistance, and H/E ratio were calculated to understand the wear material’s performance. This study aims to investigate the wear resistance of Ti-xNb (x = 15, 25 and 40wt.%), one of each type of Ti alloys and phases formed: Ti-15Nb (α´), Ti-25Nb (α”) and Ti-40Nb (β) and the influence of cooling rate after solution heat treatment on wear properties through ball cratering. It was possible to find that the harder the alloy, the higher the wear resistance. Thus, in the case of Ti-xNb (x = 15, 25 and 40wt.%), alloys the hardness plays a significant role in wear resistance. Besides that, the samples that have presented the α´ or α”phase have the lowest wear resistance. Therefore, not only the hardness influences the wear resistance but also the combination of phases formed. years TiNb Nb wellknown well known literature xray x ray XRD (XRD SEM (SEM formed impulse Additionally volume HE H E materials material s performance TixNb xNb 15 2 40wt.%, 40wt wt 40wt.% , 40wt.%) Ti15Nb 15Nb α´, α (α´) Ti25Nb 25Nb (α” Ti40Nb 40Nb β (β cratering alloy Thus αphase phase Therefore 1 40wt. (α´ (α

A device with a controllable atmosphere has been designed and fabricated to sinter metal particles in the manufacturing processes of metallic components (porous or non-porous parts). The device avoids the employment of an expensive controlled atmosphere furnace (a furnace in which it is possible to produce a vacuum or through which a constant flow of highly pure inert gas is maintained to protect the specimen). Metallic powders of pure metals or alloys with sintering temperatures (Ts) up to 1300°C and different forms and particle sizes can be used. The device consists of two chambers (an upper chamber for the atmosphere control and a lower chamber for the sintering processes) which are coupled by a sealed system composed of an O–ring and a clamp. The device is designed to be utilized with any conventional vertical electrical furnace (a furnace without the possibility of producing a vacuum inside or maintaining a constant flow of inert gas inside) and can be operated in three different ways: i) with a vacuum inside, ii) with a static atmosphere of inert gas inside, and iii) with a dynamic atmosphere of inert gas inside. porous nonporous non parts. parts . parts) specimen. specimen specimen) Ts (Ts 1300C C 1300 used Oring O ring clamp ways i ii iii 130 13 1

The demand for oil and its derivatives has driven the oil and gas sector to explore deep waters. Nickel-based alloys, like Inconel, are used due to their corrosion resistance properties. Cladding structural steels with these alloys is a cost-effective solution. However, dissimilar metal welding poses challenges, including the formation of Partially Diluted Zones (PDZ). This work highlights the use of Electron Backscatter Diffraction (EBSD) as a very adequate technique for the microstructural characterization of dissimilar anticorrosive materials. The MIG process was utilized to perform cladding of Inconel 625 onto the A36 steel substrate. The samples were prepared for analysis using techniques such as EDS, FEG-SEM, EBSD, and Vickers microhardness testing. The results demonstrate the effectiveness of the EBSD technique in characterizing dissimilar metal cladding. The combination of EBSD with EDS analysis and microhardness testing provided comprehensive insights into the microstructure and mechanical properties of the material. EDS mapping analysis confirmed the formation of PDZ with a distinct beach-like morphology, indicating localized compositional variations. The uniform thickness of the PDZ, approximately 20 µm, highlights the convective motion and solidification behavior of the partially diluted zone. Phase map EBSD analysis revealed different crystal structures in the cladding zone, including a FCC structure for the nickel cladding layer and a BCC structure for the ferritic steel base metal. The PDZ exhibited the same crystal structure as the base metal, indicating chemical element diffusion without altering the ferritic steel structure. Contrast band EBSD analysis provided detailed microstructural information, revealing solidification structures and potential hardness variations. The observed martensite formation in the PDZ highlights its susceptibility to cracking and detachment of the coated layer. The hardness results support the microstructural findings, demonstrating significant variations in hardness across the cladding structure, particularly in the PDZ and at the interface between the Inconel alloy and the base metal. These findings contribute valuable insights into the microstructural and compositional gradients within the joint region, reinforcing their implications for material performance. waters Nickelbased Nickel based costeffective cost effective solution However challenges PDZ. . (PDZ) (EBSD materials 62 A A3 substrate FEGSEM, FEGSEM FEG SEM, SEM FEG-SEM beachlike beach morphology 2 µm zone information region performance (PDZ 6

The aim of this paper was to analyze the passivation of the rear face of silicon solar cells by TiO2 thin films produced by atmospheric pressure chemical vapor deposition (APCVD). A compact high-throughput APCVD system was employed to deposit the TiO2 films. Silicon solar cells with a n+pp+ PERT (passivated emitter rear totally-diffused) structure were produced and characterized. The use of TiO2 on the rear face resulted in a 0.5 mA/cm2 increase in short-circuit current density and a 0.5% absolute improvement in efficiency compared to devices without a passivation layer. Analyzing the internal quantum efficiency of the devices, we concluded that this economically technique provides passivation on the p+ surface, doped with boron, similar to that obtained with thermally grown silicon oxide films. TiO APCVD. . (APCVD) highthroughput high throughput npp n pp n+pp passivated totallydiffused totally diffused totally-diffused characterized 05 0 5 0. mAcm2 mAcm mA cm2 cm mA/cm shortcircuit short circuit layer p surface boron (APCVD

Alzheimer's disease (AD) is the most common cause of dementia worldwide. Fifty million people today are affected by this disease globally. AD has had a tremendous impact on the affected individual, caregiver, and society, in both developed and developing nations. Donepezil—chitosan-gold nanocomposite (Donz-CS-AuNPs) was prepared by co-precipitation technique. Placket-Burman experimental design was used in this work to estimate the effect of the three independent variables (concentration of chitosan, gold, and donepezil) on the dependent variables (loading efficiency, and particle size) by using Minitab 18.1 software. The quantities for the independent variables used were: 10 and 40 mg of donepezil, 24.6 and 73.8 mg of gold, and 500 and 1500 mg of chitosan. The Donz-CS-AuNPs were characterized using energy dispersive X-ray (EDX) analysis, X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), UV-Vis spectroscopy and release study. The results of EDX showed strong signals of Au (1.5–2, 2–2.5 and 9.5–10 keV), which confirmed the specific gold peaks from the Donz-CS-AuNPs. The XRD pattern of Donz-CS-AuNPs nanocomposites showed the existence of AuNPs peak at 2θ= 38.2°, 43.8° and 64.5°. The SEM images demonstrated spherical shapes of the AuNPs. In the in vitro release study, the release increased steeply and reached 75% after 1440 min. Alzheimers Alzheimer s (AD worldwide globally individual caregiver society nations Donepezilchitosangold Donepezil chitosan DonzCSAuNPs Donz CS (Donz-CS-AuNPs coprecipitation co precipitation technique PlacketBurman Placket Burman concentration donepezil loading efficiency size 181 18 1 18. software 4 246 24 6 24. 738 73 8 73. 50 150 Xray X ray (EDX analysis XRD, , (XRD) SEM, (SEM) FTIR, FTIR (FTIR) UVVis UV Vis study 1.5–2, 152 5 2 (1.5–2 225 2–2. 9510 9 9.5–1 keV, keV keV) DonzCSAuNPs. 2θ θ 382 38 38.2° 438 43 43.8 645 64 64.5° 75 144 min 7 15 (XRD (SEM (FTIR 1.5–2 (1.5– 22 2–2 951 9.5– 3 38.2 43. 64.5 14 1.5– (1.5 2– 95 9.5 38. 64. 1.5 (1. 9. 1. (1 (

This study investigated natural attenuation conducted in soil artificially contaminated with low-sulfur diesel oil, and to evaluate the corrosion of ASTM A36 carbon steel (A36) during the bioremediation process. Microbiological quantification of hydrocarbonoclastic bactéria (HCB) and heterotrophic bacteria (Aerobic and Anaerobic) was carried out at 7, 14, 28, 42 and 56 days. Corrosion rate was quantified according to the NACE-SP-07-75 standard using the gravimetric method. Morphological analysis was conducted through Scanning Electron Microscopy. Results indicated a significant reduction of 24.03% in oils and greases in the soil, along with a respirometric degradation of 11.10%. Soil contamination with diesel led to microbial growth, mainly of HCB, during diesel bioremediation; however, there was no impact on the corrosion rate of A36. Soil corrosivity with diesel was classified as low after 56 days of experiment. These findings show that natural attenuation is a method capable of bioremediating soil with diesel without impacting nearby steel structures. lowsulfur sulfur oil A A3 (A36 process HCB (HCB Aerobic Anaerobic 7 14 28 4 5 NACESP0775 NACESP NACE SP 07 75 NACE-SP-07-7 Microscopy 2403 24 03 24.03 1110 11 10 11.10% growth however experiment structures (A3 1 2 NACESP077 0 NACE-SP-07- 240 24.0 111 11.10 (A NACESP07 NACE-SP-07 24. 11.1 NACESP0 NACE-SP-0 11. NACE-SP- NACE-SP

Polyethylene of Raised Temperature Resistance (PE-RT) is a specially designed high-density polyethylene utilizing bimodal resin technology. It is suitable for oil and gas pipeline applications, exhibiting excellent long-term creep resistance at elevated temperatures. Flexible risers require security against potential offshore oil leaks, prompting the reinforcement of PE-RT with graphene oxide (GO) at concentrations of 0.5, 1.0, and 2.0 wt.%. The nanocomposites were processed in a twin-screw mini extruder at 180°C, with a screw speed of 100 rpm and a residence time of 6 min. The results indicated an increase in the thermal stability of the nanocomposite by 14°C. XRD and DSC analyses revealed a higher crystallinity index for the sample with the lowest GO content. The water contact angle values increased from 98° in the pure matrix to 102° in the nanocomposite, suggesting a slight increase in the material's hydrophobicity due to nanoparticle incorporation. SEM images demonstrated a good interface between GO nanoparticles and PE-RT without agglomeration. The Shore D hardness increased from 50 to 59 with 2.0 wt.% GO. Although the 0.5 wt.% GO composition exhibited a higher degree of crystallinity, other properties such as thermal resistance, Shore D hardness, contact angle, dispersion, and homogeneity tended to improve with increasing nanoparticle content. Consequently, it can be concluded that the optimal concentration of GO in the PE-RT matrix is approximately 1.0 wt.%. Incorporating 1.0 wt.% GO resulted in an increase in Young's modulus from 335 ± 37 MPa to 409 ± 42 MPa, indicating enhanced mechanical strength of PE-RT. Finally, aging tests showed that GO reduced the swelling degree of the final material, suggesting that PE-RT/GO is a promising candidate for pipeline applications. PERT PE RT (PE-RT highdensity high density technology applications longterm long term temperatures leaks (GO 05 0 5 10 1 20 2 2. wt twinscrew twin 180C C 180 180°C min 14C 14 14°C content 98 102 materials material s incorporation agglomeration wt. 0. dispersion Consequently 1. Youngs Young 33 3 40 4 PERT. RT. Finally PERT/GO PERTGO RT/GO 18 9 RTGO

TC4 (Ti6Al4V) alloy is widely used in aerospace, medical equipment, food industry and other fields. Laser powder bed fusion (LPBF) technology has a short production cycle and high precision for formed parts, providing new ideas for the manufacturing of complex structures such as aerospace and having great development prospects and manufacturing advantages. This paper took the TC4 heat dissipation structure prepared by LPBF technology as the study object and established a numerical simulation model to analyze the temperature field changes of the TC4 heat dissipation structure prepared by LPBF. By adopting the annealing heat treatment process, it was found that with the increase in annealing temperature and holding time, the microstructure coarsened, the hardness first increased and then decreased, and the corrosion resistance improved. Among them, when the annealing temperature was 900 °C, and the α' phase was basically transformed into α phase, and the content of β phase increased. The grains and structure of the heat dissipation structure were uniform, and the most significant was in the near inner-pore area. At this point, the hardness value significantly decreased, and the difference in hardness around and outside the heat dissipation hole was 12.42 HV0.2. TC Ti6Al4V TiAlV Ti Al V (Ti6Al4V equipment fields (LPBF parts advantages process time coarsened decreased improved them 90 C °C uniform innerpore inner pore area point 1242 12 42 12.4 HV02 HV HV0 2 HV0.2 9 124 1 4 12. HV0.

In this study, cellular spacing, porosity and corrosion of 1050 aluminum alloy subjected to the different levels of Gamma radiation was examined using a Gammacell Co-60 type irradiator, with activity of 16.13 TBq and dose rate around 6.98 Gy/min. Samples were extracted from an aluminum ingot, which was obtained with directional solidification apparatus. This upward directional solidification technique allowed obtaining of aluminum samples under different conditions of cooling rates. Firstly, cooling rates were determined during solidification experiment and then correlated to the cellular spacings and porosity content. The experimental results pointed out that cooling rates exerts a strong effect on the microstructural patterns and porosity formation. Laws have been determined, indicating that increase in cooling rates favored a refinement effect on as-cast microstructure and a decrease in porosity content. Furthermore, measurable effects of different levels of the Gamma radiation on the microstructure, porosity and corrosion for samples of 1050 aluminum alloy, were determined. The experimental results show that Gamma radiation has favored changes in cellular spacings, porosity formation and corrosion behavior. From this results, one can conclude that coarser microstructures, porosity formation and corrosion are favored by prolonged thermal annealing caused by temperature field generated during Gamma radiation exposure. On the other hand, even after the exposure to different levels of Gamma radiation, the microstructure and porosity observed in as-cast samples are still strongly dependent of the cooling conditions. study spacing 105 Co60 Co 60 Co-6 irradiator 1613 16 13 16.1 698 6 98 6.9 Gymin Gy min Gy/min ingot apparatus Firstly content ascast as cast Furthermore behavior microstructures hand 10 Co6 Co- 161 1 16. 69 9 6.

The work evaluated the nucleating effect of nanometric zirconia (Zr-NP), obtained by the green sol-gel synthesis route using Euclea natalensis root extract as a reductant, in the low-density polyethylene (LDPE). The Zr-NP was characterized with x-ray diffraction (XRD) and transmission electron microscopy (TEM) which confirmed the presence of Zr-NP in the cubic crystalline phase with an average particle size of 6.73 nm. The Zr-NP was incorporated into the polymeric matrix by solubilization in concentrations ranging between 0 wt% and 6 wt%. Non-isothermal DSC analyzes demonstrated that a small addition of 1 wt% changes the degree of crystallinity from ~23% to ~56%, an increase of ~137%. The addition of Zr-NP also caused a small increase in crystallization and melting temperatures, and a large increase in the total crystallization time of LDPE. ZrNP, ZrNP Zr NP , (Zr-NP) solgel sol gel reductant lowdensity low density LDPE . (LDPE) xray x ray XRD (XRD TEM (TEM 673 73 6.7 nm wt Nonisothermal Non isothermal 23 ~23 56 ~56% 137 ~137% temperatures (Zr-NP (LDPE 67 7 6. 2 ~2 5 ~56 13 ~137 ~ ~5 ~13 ~1