Volume-16 ~ Issue-5 ~ May 2023

Abstract: 4,4' –diformyl-4''-methoxytriphenylamine was synthesized by the treatment of 4-methoxy triphenyl amine with POCl3 and DMF mixture with stirring and then heated the mixture for 7h at 950-1000c. After cooling, the mixture was poured into crushed ice and neutralized till PH=8.4,4'-bis [6-hydroxy benzoxazol-2-yl] -4''-methoxy triphenyl amine was synthesized by the treatment of 4,4'-diformyl-4''-methoxy triphenyl amine with4-amino resorcinol in presence of 50 wt% of silica supported sodium hydrogen sulphate in the solvent medium of THF refluxed for 16h. Polyester was prepared from polycondensation of 4,4'-bis [6-hydroxy benzoxazol-2-yl] -4''-methoxy triphenyl amine with terephthaloyl dichloride in presence of triethyl amine in the solvent medium of DMF first at 00c then stirred for 6h at room temperature.

Keywords. 4,4'-diformyl-4''-methoxy triphenyl amine, 4,4'-bis[6-hydroxy benzoxazol-2-yl] -4"- methoxytriphenyl amine, polycondensation.

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Abstract: Aluminium inhibition was investigated in 1M HCl medium by three organic molecules : benzoïc acid (BA), acid 3-chlorobenzoïc (A3CB) and acid 3-phenylthiobenzoïc (A3PTB). It has been observed that the corrosion inhibition efficiency IE (%) increases with increasing concentration of each of these molecules but decreases with increasing temperature. The experimental results were fitted to adsorption models as Langmuir, El-Awady, Flory Huggins… Tough, the Langmuir adsorption is the best, it can't be applied rigorously. The Villamil isotherm was therefore used. The Adejo-Ekwenchi isotherm was used to assess to the adsorption type. Thermodynamic adsorption and activation functions have been determined and examined. We also studied the influence of the solvent on the corrosion inhibition. We used Molinspiration software and DFT to determine molecular descriptors....

Keywords. Aluminium, corrosion inhibition, adsorption isotherms, thermodynamic functions, Molinspiration, DFT, PAC, QSPR method.

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Abstract: The fly ash composition analysis may helpful in developing a pollution abatement approach for different uses of fly ash such as cement and ceramics manufacturing. The current study deals with the characterization of fly ash samples collected from NTPC Dadri unit in India for many different oxides (Na2O, MnO, SO3, P2O5, MgO, K2O, TiO2, CaO, Fe2O3, Al2O3 and SiO2) by non-destructive technique, SEM, XRD. Among the major elements, the concentration of SiO2 is found to be the highest 58.0 % and that of Na2O is found to be the lowest 0.17%. To know the chemical properties, morphology using Scanning (EDX), phase composition using X-ray Diffraction (XRD) has been performed. To know the physical properties of fly ash as average particle size (6.90μm), average moisture content (0.175 %), specific gravity (2.275) and average true density (2.29g/cm3) have been performed and identified..

Keywords. Fly ash, Physical properties, Chemical properties, SEM, XRD.

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Abstract: The study aims to investigate the photothermal efficiency of hollow gold nanoparticles (HAuNPs) and their cytotoxic effects on colorectal adenocarcinoma (Caco-2) cell lines. HAuNPs have garnered significant interest as potential agents for photothermal therapy in cancer treatment due to their unique properties. In this research, HAuNPs were synthesized and characterized using various UV-Vis spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy-dispersive X-ray spectroscopy (EDX). The photothermal efficiency of the HAuNPs was evaluated by irradiating them with 808 nm near-infrared (NIR) laser light, and the resulting temperature rise was monitored using both a thermocouple and an infrared thermal camera......

Keywords. Hollow gold nanoparticle; photothermal agent; photothermal therapy; cancer; caco-2.

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https://doi.org/10.1021/la0513712
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