A5007990891- Cultural Heritage Materials Analysis
- Copper-based nanomaterials and applications
- Phytochemicals and Antioxidant Activities
- Magnesium Alloys: Properties and Applications
- Conservation Techniques and Studies
- Microstructure and Mechanical Properties of Steels
- Corrosion Behavior and Inhibition
- ZnO doping and properties
- Nanoparticles: synthesis and applications
- Building materials and conservation
- Laser-Ablation Synthesis of Nanoparticles
- Metallurgy and Material Forming
- Magnetic Properties and Synthesis of Ferrites
- Iron oxide chemistry and applications
- High-Temperature Coating Behaviors
- Metal and Thin Film Mechanics
- Metallurgy and Cultural Artifacts
- Bone Tissue Engineering Materials
- Magnesium Oxide Properties and Applications
- High Temperature Alloys and Creep
- Bee Products Chemical Analysis
- Nuclear Materials and Properties
- Layered Double Hydroxides Synthesis and Applications
- Advanced ceramic materials synthesis
- Metal Alloys Wear and Properties
University of Pitesti
2014-2025
Universitatea Națională de Știință și Tehnologie Politehnica București
2024
Nanomaterials are materials at the nanometric scale that have distinctive functionalities and properties. Due to their unique properties relative traditional materials, nanomaterials attract great interest from researchers. ZnO-based especially demonstrate versatility, accessibility, biocompatibility low toxicity. In recent years, there has been a growing in developing eco-friendly sustainable approaches for synthesizing nanomaterials. development of ecological techniques synthesis, using...
The stone Ensemble from Corbii de Piatrǎ Romania arouses a continuous scientific interest, with the final goal being to obtain an exhaustive and multidisciplinary package of results that will become support extensive restoration project. cave painting stands out as most important affected by advanced degradation among historical monuments in Romania. This article provides for first time radiocarbon dating forms establishing age mortar/plaster used pictorial support. Being very complex...
Sustainable and eco-friendly synthesis methods for nanoparticles are crucial advancing green nanotechnology. This study presents the biogenic of zinc oxide (ZnO) magnesium (MgO) using ovalbumin, an abundant non-toxic protein from egg white. The process was optimized by varying metal ion concentrations to control particle size morphology. Characterization ATR-FTIR, XRD, SEM, UV-VIS confirmed successful formation uniform, well-crystallized with sizes ranging 7.9 13.5 nm. ZnO exhibited superior...
The Inconel 718 alloy is a nickel-based superalloy that can be strengthened through precipitation hardening. Due to its exceptional mechanical properties, high corrosion resistance, and good workability, it particularly suitable for applications where components operate in corrosive environments at temperatures up 600 °C. Under these conditions, overheating frequently occurs, leading structural transformations changes properties. This experimental study examined the effect of repeated on...
We report a study on the biocompatibility vs. thickness in case of titanium nitride (TiN) films synthesized 410 medical grade stainless steel substrates by pulsed laser deposition. The were grown nitrogen atmosphere, and their vitro cytotoxicity was assessed according to ISO 10993-5 [1]. Extensive physical-chemical analyses have been carried out deposited structures with various thicknesses order explain differences biological behavior: profilometry, scanning electron microscopy, atomic...
Hericium erinaceus is a medicinal fungal species that produces the active biological metabolite erinacine A with strong antioxidant activity. The classical extraction techniques used to date obtain metabolites from this require high consumption of resources and energy and, in end, prove be expensive inefficient, especially on biomedical scale. aim research based development an ultrasonic (UE) method for identification compounds activity mycelia H. biomass developed through solid cultivation...
Abstract The Joint European Torus (JET) fusion reactor was upgraded to the metallic wall configuration in 2011 which consisted of bulk beryllium (Be) tiles main chamber and tungsten (W) W-coated CFC divertor (Matthews G.F. et al Phys. Scr. T148 014001). During each campaign, a series damages were observed; on upper dump plates (UDP) positioned top part vessel walls inner wall—mainly affecting guard limiters (IWGL). In both cases, it concluded that causes these unmitigated plasma disruptions....
The plasma electrolytic oxidation (PEO) surface modification technique was employed for improving the mechanical and anti-corrosion properties of AZ63 magnesium alloy. Different PEO processing times (5, 10 20 min) in a g/L NaAlO2 electrolyte, with no other additives, led to formation ceramic coatings mean thicknesses between 15 37 microns. Scanning electron microscopy (SEM) showed that porosity decreased time, but an increase roughness observed. X-Ray diffraction phase analysis indicated...
Ceramic coatings have many advantages for industrial and medical applications due to their exceptional properties. with a thickness of approximately 45 μm, after grinding, were grown using robotic arm that used the atmospheric plasma spraying procedure. The thermal shock stresses—a common situation in but difficult reproduce under laboratory conditions—of ceramic layers on top metal substrate was achieved solar energy focused by concentrating mirror, based experiments conducted CNRS-PROMES...
This scientific research focused on the production of hydroethanolic extract plant species Lycopodium selago L. (L. selago) by ultrasound-assisted extraction (USAE) and identification biocompounds with high antioxidant activity is interest for possible phytotherapeutic treatment against Alzheimer’s disease (AD). The was phytochemically analyzed to investigate polyphenols, flavonoids, identify sesquiterpenoid alkaloid huperzine A (HupA), which known in literature its great relevance AD....
Nowadays, nanotechnology offers opportunities to create new features and functions of emerging materials. Correlation studies nanostructured materials' development processes with morphology, structure, properties represent one the most important topics today due potential applications in all fields: chemistry, mechanics, electronics, optics, medicine, food, or defense. Our research was motivated by fact that nanometric domain, crystalline structure morphology are determined elaboration...
The precipitation-hardenable nickel-based superalloy Rene 41 exhibits remarkable mechanical characteristics and high corrosion resistance at temperatures, properties that allow it to be used in high-end applications. This research paper presents findings on the influence of thermal shocks its microstructure, hardness, diffusivity temperatures between 700 1000 °C. Solar energy was for cyclic shock tests. samples were characterized using microhardness measurements, optical microscopic...
This paper presents the influence of different precursors on morphostructure zinc oxide nanoparticles used for impregnation polystyrene (PES) filters. Zinc were synthesized by a microwave and ultrasound-assisted hydrolytic method using (Zn(NO3)2-6H2O; ZnSO4-7H2O; Zn(CH3COO)2-2H2O) sodium hydroxide as nucleophilic agent. The resulting powders calcined at 550 °C 2 hours. Using Williamson-Hall XRD analysis, crystalline structure was determined, with average sizes 40 nm (ZnO_AZ_US_MAE), 35.6...
Hericium erinaceus (H. erinaceus) is a rare and appreciated fungal species belonging to the division Basidiomycota used for centuries in traditional Chinese medicine its medicinal value. This of mushrooms brings most diverse benefits human body, can have beneficial effects treating Alzheimer’s disease (AD). study investigated whether ethanolic extract from biomass H. enhances cognitive function via action on cholinergic neurons using scopolamine (SCOP)-induced zebrafish (Danio rerio) model...
Magnetite (Fe3O4) nanoparticles have garnered the attention of researchers in fields renewable energy, electronics, and medicine over past decade due to their magnetic high susceptibility. The unique properties magnetite make it an essential material for development advancement technologies. To obtain powder through hydrothermal synthesis, precursors used were FeCl2·4H2O FeCl3·6H2O aqueous solutions with a molar ratio 1:2, NaOH solution concentration 2 M was as hydrolysis agent. reaction...
Titanium dioxide exists in three crystalline phases: anatase, rutile and brookite. Although is thermodynamically more stable, anatase considered as the most favorable phase for photocatalysis solar energy conversion. Recent studies have shown a significant improvement of light harvesting overall conversion efficiency nanoparticles dye-sensitized cells (DSSCs) when using mixture phases (10-15% rutile). TiO2 nanopowders been prepared by physical vapor deposition process (SPVD). This method has...
The fresco of the Corbii de Piatră Cave Church, dating from end 13th century and beginning 14th century, is applied to sandstone wall. degradation on large surfaces, with many areas detachment, has been determined by infiltration meteoric water through wall which it applied, as well temperature variations, repeated wetting/drying processes. However, there are small portions that show good adhesion present research, aimed at providing scientific data restorers historians, involves advanced...
In the present study, effect of Hf and Ti substitution Zr in ZrCo alloy, used for hydrogen isotope storage, has been investigated order to ascertain improvement anti-disproportionation property hydrides. The ultimate goal investigation is develop a safe economically viable solution long-term storage deuterium tritium. intermetallic compounds Zrl-xTixCo Zrl-xHfxCo (x = 0.1, 0.2) were prepared their suitability protium (H) (D), was investigated. alloys synthesized by arc melting under...
In this study, the surface of commercially pure titanium (Cp-Ti) was covered by a 21–95 µm-thick aluminum oxide layer using plasma electrolytic oxidation. Coating characterization revealed formation nodular and granular α- γ-Al2O3 phases with minor amounts TiAl2O5 Na2Ti4O9 which yielded maximum 49.0 GPa hardness 50 N adhesive critical load. The corrosion resistance behavior in 3.5 wt.% NaCl solution all oxidation (PEO) coatings found to be two orders magnitude higher compared bare Ti substrate.
This paper presents research on the degradation processes of fresco painting in cave church Corbii de Piatră Hermitage under influence meteoric infiltration water and environmental factors. The medieval dates from end 13th century beginning 14th century, being painted a sandstone wall. through this wall, temperature variations, environment repeated wetting/drying determined fresco, resulting its detachment large surfaces. established correlations between that take place, structural...
The main aim of this research work is to investigate by the means X-ray analysis methods spent catalysts and recovered valuable metals in order prove efficiency recycling process as a environmental issue.The materials used for were catalyst samples based on Cu, Cr, Zn, Al, Ni, from Romanian petroleum refining industry.By hydrometallurgical route it has been Al Cu.The diffraction fluorescence spectrometry.This practical implications wastes not only recovery lowering costs but also prevent pollution.