https://nstj.arakut.ac.ir/ علوم و فنون نانو fa daily 1 Wed, 06 Mar 2024 00:00:00 +0330 Wed, 06 Mar 2024 00:00:00 +0330 https://nstj.arakut.ac.ir/article_716035.html The quest to replace toxic and hazardous chemicals in the nearest future in all industrial pipelines are interested to revolutionize the anti-corrosion material research world by turning its attention to green formulations based on the nanotechnology. Herein, we report a new combination of corrosion inhibiting potential of cinnamaldehyde contained Poly(methyl methacrylate) nanocolloid and KI internal intensifier mixture on the corrosion of C1018 steel in 3 Wt.% HF and 15 Wt.% HCl solution. KI internal intensifier was prepared by water-in-oil microemulsion and was characterized wit Dynamic Light Scattering (DLS) analysis and the average particle size of KI internal intensifier containing surfactant-based microemulsion was 73 ± 2 nm. We also report the effect of the inhibitor concentration, types of steel alloy, intensifier additive concentration, as well as temperature on the corrosion inhibiting performance of corrosion inhibitor + KI microemulsion mixture. corrosion inhibitor + KI microemulsion mixture exhibits inhibiting ability but the extent of inhibition is dependent on concentration, temperature, and intensifiers’ concentration. The adsorption of cinnamaldehyde contained polymer + organic sulfur compound + KI internal intensifier is synergistic in nature. Increase in the temperature study resulted in a slight decline in the inhibition efficiency of corrosion inhibitor + KI with efficiency of above 95% achieved at 343 K and inhibition efficiency by amine film forming on the surface of alloy was confirmed with Atomic Force Microscopy (AFM) and compared to uninhibited alloy sample. https://nstj.arakut.ac.ir/article_717927.html Introduction and purpose: Paramecium caudatum is a suitable animal model. We studied effect of magnetite nanoparticles under static magnetic field (SMF) on the toxicity of colchicine in P. caudatum. Materials & Methods: The animal was collected from nature's water resources, and cultivated in the laboratory weekly with straw to purify. The pure culture was divided into two groups, one in the laboratory and the other group under SMF (72 hours). Each group was divided into control (1 µL of distilled water), colchicine alone (doses of 1, 3 and 9 μg/μL), nano Fe3O4 alone (doses of 1, 3 and 9 μg/μL) and nanomaterials + colchicine. A sample at a volume of 0.1 mL was placed on the slide and studied 25 times under x4 in a 30-second period (with 5-second intervals). Animal's s-swimming movement was counted for 25 times, within the 30-second. Also, the neuromotor system, the macronucleus, and the avoidance reaction were studied and data were computed using ANOVA under 0.05 error. Results: The field singly had a little reduced effect on the motility of Paramecium. Colchicine decreased locomotion in both groups. In addition, it showed destruction of macronucleus and pellicle and most importantly destructed the neuromotor system, but no significant difference was observed in tubulin density. In the case of Fe3O4 NPs + colchicine, a little protective effect caused by nanomaterials was observed. Conclusion: The effect of colchicine as a neurotoxin is focused on the motor system, and Fe3O4 NPs has little protective effect regardless of laboratory and SMF. https://nstj.arakut.ac.ir/article_727375.html This study explores the growth behavior, microstructure, and antibacterial performance of electrodeposited silver (Ag) thin films on different substrates, with particular attention to their application in water and wastewater treatment systems. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) analyses reveal that substrate material strongly affects film morphology: Ag films on copper (Cu) show compact granular structures, while those on Au₂PdAg/glass exhibit surface cracks that impair antibacterial effectiveness. XRD patterns confirm the polycrystalline nature of the films with preferential (111) orientation, known for its high surface energy and ion-release efficiency. Crystallite size evolution follows a dynamical scaling law with a growth exponent β ≈ 0.67, indicating anomalous roughness behavior. Log-normal grain size distributions and SEM analyses yield a dynamic exponent of 1/z ≈ 0.63, suggesting three-dimensional cluster growth involving the full cluster surface in mass transport. Increased film thickness leads to higher surface roughness, as confirmed by X-ray reflectivity, which improves hydrophilicity and ion transport. Despite grain growth reducing specific surface area, roughness compensates by enhancing ion release and structural durability. Additionally, film density values obtained from reflectivity are lower than bulk Ag, likely due to porosity and oxidation. These findings underscore the importance of controlling thickness and substrate compatibility to optimize the antibacterial efficiency and stability of Ag thin films for aqueous environments.