For a variety of applications, the brass alloy has been utilized to replace titanium tubes in heat exchangers. Copper alloys' high corrosion rate during the acid cleaning procedure remains a significant concern. To inhibit the corrosion of brass alloys, we prepared two novel gemini surfactants (GSs), N ₁,N ₃-dibenzyl-N ₁,N ₁,N ₃,N ₃-tetramethylpropane-1,3-diaminium tetrafluoroborate (I H) and N ₁,N ₁,N ₃,N ₃-tetramethyl-N ₁,N ₃-bis (4-methyl benzyl) propane-1,3-diaminium tetrafluoroborate (I Me), and they were characterized using Fourier transform infrared spectroscopy and ¹H nuclear magnetic resonance spectroscopy. Their inhibition performance against corrosion of brass alloys in 1 M HCl was studied using electrochemical techniques including potentiodynamic polarization (PP), electrochemical impedance spectroscopy, and electrochemical frequency modulation. The inhibition effect of the synthesized compounds was high, and it increased as the inhibitor's concentration was increased. The maximum level of inhibition efficiency was achieved at an inhibitor concentration of 100 ppm, reaching 96.42% according to PP measurements. From Langmuir data, the mechanisms of adsorption of the two GSs on the surface of copper was found to be physisorption and chemisorption adsorption. X-ray photoelectron spectroscopy and scanning electron microscopy show that the addition of the two compounds lowers the dissolution of brass ions in the corrosive solution and forms a protective layer on the surface of the brass.

Carbon steel is widely used in the petroleum industry for pipelines, storage tanks, and equipment due to its mechanical properties, and strength. However, challenges such as environmental conditions and corrosive materials can affect its lifespan and require maintenance and repair. This work aimed to prepare pyrazalone-sulfonamide hybrids, and confirmed by mass spectra, FTIR, ¹H-NMR, and ¹³C-NMR. These compounds were examined as mild steel corrosion inhibitors in 1 M HCl solutions at 298–323 K using the gravimetric technique, electrochemical measurements, scanning electronic microscope analysis, and quantum chemical calculations. The values of inhibitory efficiency identified by electrochemical and non-electrochemical techniques exhibit good agreement. At various temperatures and in the 50 to 500 ppm concentration range. During the adsorption process, these substances connect to the Langmuir adsorption isotherm. Some adsorption isotherm and kinetic parameters have been developed and discussed. The metal surface had a thin inhibitory protective layer, according to investigations using energy dispersive X-ray spectroscopy (EDX) and scanning electron microscope (SEM). These findings demonstrated the potential of pyrazolone-sulfonamide as effective organic corrosion inhibitors for carbon steel.

Objective. This study aimed to investigate the preparation of patuletin-encapsulated chitosan nanoparticles (PT-CS-NPs) using the ionic gelation method, evaluate their potential as anticancer agents, and invent a new method of differential pulse voltammetric analysis for patuletin (PT). Methods. Computational studies were conducted to assess the affinity of PT for chitosan, confirming a promising interaction. PT-CS-NPs were synthesized based on the computational outputs, resulting in nanoparticles with an angular structure and an average size of 6.168 nm. The cytotoxicity of PT and PT-CS-NP was evaluated in breast and colon cancer cell lines, and selectivity indices were calculated to assess safety profiles. The electrochemical behavior of PT was also investigated using the Britton–Robinson buffer. Results. PT-CS-NP exhibited both potent cytotoxicity and a favorable safety profile, showing the most active and safest pattern of cytotoxicity among the tested compounds. The electrochemical oxidation of PT was observed at 0.531 V vs. Ag/AgCl at pH 4.0.0. The concentration of PT showed a linear relationship with the corresponding peak current over the range of M, with a minimum limit of detection of 3.4 × 10⁽⁻⁹⁾M. The proposed method successfully measured PT, with a relative standard deviation below 2%. Conclusion. The preparation of PT-CS-NP via the ionic gelation method resulted in angular nanoparticles with a promising anticancer activity and safety profiles. The electrochemical behavior of PT was characterized, and a reliable method for PT quantification was established.

Ethylene vinyl acetate (EVA) copolymers are widely employed as pour point depressants to enhance the flow properties of crude oil. However, EVA copolymers have limitations that necessitate their development. This work investigated the modification of EVA via gamma radiation-induced grafting of butyl acrylate (BuA) monomers and the evaluation of grafted EVA as a pour point depressant for crude oil. The successful grafting of poly(butyl acrylate) p(BuA) onto EVA was verified through grafting parameters, FTIR spectroscopy, and ¹H NMR spectroscopy. Treating crude oil with 3000 ppm of (EVA)_0kGy, (EVA)_50kGy, and (1EVA:3BuA)_50kGy yielded substantial reductions in pour point of 24, 21, and 21 °C, respectively. Also, rheological characterization demonstrated improving evidenced by a viscosity reduction of 76.20%, 67.70%, and 71.94% at 25 °C, and 83.16%, 74.98%, and 81.53% at 12 °C. At low dosages of 1000 ppm, the EVA-g-p(BuA) exhibited superior pour point reductions compared to unmodified EVA, highlighting the benefit of incorporating p(BuA) side chains. The grafted EVA copolymers with p(BuA) side chains showed excellent potential as crude oil flow improvers by promoting more effective adsorption and co-crystallization with paraffin wax molecules.