Two new imidazolium-based ionic liquids namely, 1-hexadecyl-3-(4-methylbenzyl)-1H-imidazol-3-ium chloride (IL-CH3), and 1-hexadecyl-3-(4-nitrobenzyl)-1H-imidazol-3-ium chloride (IL-NO2) were synthesized. The inhibitory activity of these compounds against the corrosion of low-carbon steel (LCS) in a 1 M HCl was examined by utilize multiple techniques such as polarization (PP) and electrochemical impedance spectroscopy (EIS). The outcome data displayed that the protection efficiency rises with improving the dose of IL'S (IL-CH3, IL-NO2). PP data confirm that they are mixed kind inhibitors. Best performances (i.e. 92.9% and 94.5%) were recorded at maximal IL-CH3 (100 ppm) and IL-NO2 (100 ppm) doses, respectively. These findings imply that the novel ionic liquids (IL-CH3, IL-NO2) are efficient corrosion inhibitors.

The disastrous consequences for society—economically, environmentally, and socially—caused by oil spills encouraged us to treat this problem. The target of this work is to synthesize new amphiphilic dicationic ionic liquids (Ia, Ib, and Ic) and evaluate them spectroscopically and gravimetrically as potential oil spill dispersants at different temperatures to cover cold and warm areas. The synthesized ILs were well characterized by different tools for analysis of their surface activity and thermal stability. Ia, Ib, and Ic showed good dispersion effects, which were recorded to be 5.32, 20.45, and 33.61% for Ia, Ib, and Ic, respectively, at 10 °C and 12.28, 52.55, and 66.80% for Ia, Ib, and Ic, respectively, at 30 °C with a dispersant-to-oil ratio (DOR) of 0.8:10 (wt.%). Acute toxicity tests were elucidated against Nile tilapia and Oreochromis niloticus fish and confirmed their slight toxicity by determining a LC50 value greater than 100 ppm after 96 h, which recorded 13.25, 17.75, and 37.5 mg/L for Ia, Ib, and Ic, respectively. Overall, the new synthesized ILs can be represented as sustainable materials for toxic chemicals to disperse oil spills.

This paper describes the corrosion inhibiting action of four new imidazolium-derived ionic liquids (ILs). Elements analysis, Infrared, TGA, H-1-C-13 NMR, XRD and HSQC-NMR were used to confirm the molecular formula of ILs. The corrosion suppressive effectiveness was calculated using loss of mass and electrochemical experiments and ranged from 53 to 96%. Their adsorption on a steel substrate was precisely characterized using the Langmuir isotherm. Gibbs free energies vary from 35.24 kJ mol(-1) to 41.82 kJ mol(-1), indicating that ILs are adsorbing via physi-chemisorption scenario. SEM/EDX and FTIR were used to validate the process of adsorption of ionic liquids.(c) 2022 Elsevier B.V. All rights reserved.

Three newly ionic liquids namely, 1-bnzyl-2-methyl-3-octyl-1H-imidazol-3-ium bromide, 1-bnzyl-3decyl-2-methyl-1H-imidazol-3-ium bromide, and 1-bnzyl-3-dodecyl-2-methyl-1H-imidazol-3-ium bromide are synthesized and their chemical structures characterized via different spectra techniques (FTIR, elemental analysis, and 1H NMR). The corrosion inhibition of newly ionic liquids was evaluated on aluminum alloy in 1 M HCl at varied exposure temperatures (298-318 K) and varied concentrations via various experimental and theoretical methods for example mass loss, electrochemical, spectral, and computational calculations. The results illustrate that these types of ionic liquids inhibit corrosion of aluminum in acid solution with maximum inhibition efficiency was reached 83.2 % at 298 K. The inhibition efficiency increases with the addition of zinc sulfate which has a synergistic impact which was reached to 92.7%. Also, the concentration of ionic liquids and the kind of cation have an impact on the obtained results. The existence of these inhibitors in the acidic solution improves the charge transfer resistance and lessens the double-layer capacitance. The Langmuir adsorption isotherm governs the adsorption of these inhibitors' molecules on the aluminum alloy surface, and they behave as mixed-type inhibitors. The outputs reveal that the computational calculations match the experimental data rather well. (c) 2022 Elsevier B.V. All rights reserved.

Three novel ionic liquids (3-(2-ethoxymethyl)-1-octyl-1H-imidazol-3-ium chloride, 1-decyl-3-(2-ethoxy methyl)-1H-imidazol-3-ium chloride and 1-dodecyl-3-(2-ethoxymethyl)-1H-imidazol-3-ium chloride) were manufactured and their chemical structures were confirmed by spectra tools (FT-IR, H-1 NMR, and C-13 NMR). The inhibition impact of the new ionic liquids on stainless steel (201 SS) in 2.0 M HCl solution was examined via various electrochemical measurements. These measurements revealed that the new ionic liquids are excellent inhibitors even at very low concentrations. The findings confirmed that the new ionic liquids inhibit both cathodic and anodic processes while also improving corrosion resistance. The polarization curves confirmed that the ionic liquids produced function as mixed inhibitors. This attitude is determined by the cation type and concentration of ionic liquids. The anti-corrosion properties of ionic liquids are based on their adsorption potential. The relation between molecular structure and its inhibitive action has been explored and discussed by DFT & Monte Carlo Simulation methods. Furthermore, the XPS was carried out with and without the synthesized ionic liquids on the 201 SS samples. There is a strong approach between the collected data from electrochemical, surface, and theoretical studies. (C) 2021 Elsevier B.V. All rights reserved.

New benzalkoniumchloride derivatives ionic liquids (ILs) were synthesized in ≥ 97% yield and their inhibiting properties for the corrosion of carbon steel in formation water had been evaluated using chemical methods. The structures of the ILs compounds were investigated by elemental analysis, FT-IR spectrophotometer and 1H NMR spectroscopy. The designed molecular structure of ILs, with N atoms, makes it good corrosion inhibitor via the adsorption of ILs on the carbon steel surface to suppress both anodic and cathodic processes. The inhibition efficiency increases with increased ILs concentration.

The new group of ionic liquids based on imidazole molecule has been considered as promising anti-corrosion additives (admixed additives) to protect the steel rebars in the cement pore solution. In this paper, four new ionic liquids based on imidazole molecule are synthesized and characterized. Herein, the corrosion prevention properties of new ionic liquids are explored by chemical and electrochemical tests. The electrochemical tests proved that the new ionic liquids hinder both the cathodic and anodic processes and increase the corrosion resistance. The mass loss tests indicated that the performance capabilities of the synthesized ionic liquids are between 76% and 95%. Here, the new compounds reduce the corrosion of the steel rebars in the cement pore solution. This situation depends on the type of cation and the concentrations of ionic liquids. The responsibility of ionic liquids as anti-corrosion additives is centered on their adsorption ability. Langmuir isotherm is the best isotherm for the adsorption process. The obtained Gibbs free energies point to chemi-physisorption of ionic liquids.

Three asymmetric dicationic ionic liquids; 1-(2-(1-dodecyl-2-methyl-1H-imidazol-3-ium-3-yl)ethyl)-4-methylpyridin-1-ium bromide, 1-(6-(1-dodecyl-2-methyl-1H-imidazol-3-ium-3-yl)hexyl)-4-methylpyridin-1-ium bromide and 1-(10-(1-dodecyl-2-methyl-1H-imidazol-3-ium-3-yl) decyl)-4-methylpyridin-1-ium bromide (Ia, Ib &Ic respectively) were synthesized and characterized via Elemental analysis, FT-IR, 1H NMR, and Thermo-gravimetric analysis (TGA). Their surface activities were studied. The performance of the synthesized ionic liquids as oil spill dispersants were evaluated at different temperatures (10, 30 & 50 °C) and concentrations (750, 1500, 2000, 3000 ppm). Data reveals that the efficiency is ranked as follows: Ib > Ia > Ic with concentration of 1500 ppm.

Gemini surfactants attracted researchers to investigate their properties and applications. In this regard, a new group (three compounds) of Gemini surfactants based on alkyl benzenaminium with different length in the terminal alkyl groups was synthesized in this study. The chemical structures of the new of Gemini surfactants were confirmed by elemental identification, FT-IR, and H-1 NMR analysis. Various electrochemical methods were used to investigate the anticorrosion and adsorption properties of newGemini surfactants. The results showed that the three Gemini surfactants are very effective to inhibit the corrosion of carbon steel in 1.0MHCl solution with high inhibition efficiencies approximate to 95% and 99%. According to the adsorption studies, the prepared Gemini surfactants adsorbed on the steel surface in the form of a monolayer without lateral interlink between the molecules. In addition, the dominant adsorption of Gemini surfactants is the physisorption type. (C) 2021 Elsevier B.V. All rights reserved.

THERMAL oxidative aging of bitumen has a bad effect on the durability of bitumen binder. We aim in this research to reduce the thermal oxidative aging of bitumen by preparing two compounds namely (R-OCH3=AO(1)) and (R-NO2=AO(2)) and examined as antioxidants. These compounds characterized via the conventional spectral tools of analysis (FTIR and H-1-NMR). They mixed with local bitumen (60/70) separately at different concentrations ratios (0.25, 0.5 and 1%) then aged via TFOT at 170 degrees C for 5 hours. The effect of them evaluated based on the changes in FTIR, total acid number (TAN) and the physical properties of bitumen before and after the thermal oxidation. The results showed that 0.5, 1% of AO(1) antioxidant gave the best results of modification of bitumen. After the samples modified with these two concentration ratios of antioxidant AO(1), they mixed with 3% Styrene Butadiene Styrene (SBS) polymer then aged via TFOT at 170 degrees C for 5 hours. The effect of the antioxidant in reducing the aging of the SBS modified bitumen (SBSMB) was evaluated through the changes in FTIR, TAN and the physical properties of bitumen before and after the thermal oxidation. The results illustrated that the best modification of SBSMB was at 1% (AO(1)).

New series of ionic liquids based on benzalkonium chloride derivatives are presented in this work. The new ionic liquids are recognized by elemental analysis, Fourier transform infrared (FTIR), and hydrogen nuclear magnetic resonance (1H NMR). They have been considered as promising anti-corrosion and anti-microbial additives in the petroleum industry. In this paper, the anti-corrosion and anti-microbial activities of four synthesized benzalkonium chloride derivatives (BCIL) are measured for carbon steel structure immersed in the formation water and contaminated solution by sulfate-reducing bacteria (SRB). The anti-corrosion properties of BCIL are evaluated using chemical and electrochemical methods. The anti-microbial activities of BCIL were tested against SRB. Collectively, the results confirmed that the new ionic liquids (BCIL) play as anti-corrosion and anti-microbial additives. These new additives led to protect the carbon steel structure from corrosion caused by formation water and from bio-corrosion caused by SRB.

2-(tert-butyl)-4-(((4-methoxyphenyl)-phenol (Ia) and 2-(tert-butyl)-4-(4-nitrophenyl)diazenyl(Ib) were produced as the local oil supply antioxidant and examined. The structures were clarified using standard analytical techniques (elemental analysis FT-IR, 1H-NMR and mass spectroscopy). Oxidation stability was investigated before and after adding various Ia and Ib concentrations through change in total acid number (TAN) and viscosity. The findings were discussed and the effectiveness classified as follows: Ia > Ib. Ia > Ib. A good agreement with the experimental findings was shown by the quantum chemical calculations (E-HOMO, E-LUMO and E-LUMO-E-HOMO).

Ionic liquids with high environmental value and adsorption properties are a requirement for the new trend for corrosion inhibitors. Here, we synthesis three new ionic liquids based on dicationic imidazolium (IL1, IL2 and IL3) to produce green inhibitors for stainless steel corrosion in acidic environment. The anionic portion of all prepared ionic liquids is BF4-. New ionic liquids were recognized by means of element inspection, FT-IR, TGA and H-1 NMR spectroscopy. All prepared ionic liquids work as good corrosion inhibitors. Where their efficiencies are 91.5%, 98.4% and 83.3% for IL1, IL2 and IL3, respectively at 100 ppm. The counter portion of ILs (BF4-) has a great role in the adsorption process. (C) 2019 Elsevier B.V. All rights reserved.

Three gemini ionic liquids namely, 3,3'-(1,4-phenylenebis(methylene))bis(1-alkyl-1H-imidazol-3-ium)bromide IL1,IL2 and IL3, were prepared and characterized via the conventional tools of analysis, elemental analysis, IR, and H-1 NMR spectroscopy. The thermal stability of these compounds was studied, using thermogravimetric analysis (TGA) technique. The gemini ionic liquids were tested as corrosion inhibitors for stainless steel (304 SS) in 0.5 M H2SO4 solution using electrochemical techniques. The Results showed that gemini ionic liquids were effective with optimal corrosion inhibition values of 90.7%, 973% and 82.6% for IL1,IL2 and IL3, respectively. The data confirmed also gemini ionic liquids are mixed type inhibitors. (C) 2018 Elsevier B.V. All rights reserved.

Four functionalized ionic liquids of the type 3-(n-aminoalkyl)-1,2-dimethyl imidazolium bis((trifluoromethyl)sulfonyl)imide (IL101 and IL102), and 3-(n-aminoalkyl)-1,2-dimethyl imidazolium tetrafluoroborate(IL103 and IL104) were synthesized and characterized via the conventional tools of analysis. The application of these compounds as potential industrial solvents for carbon dioxide removal from natural gas is studied. In our work we used bubbling technique, as chemical absorption one, for CO2 removal by chemical means involves one or more reversible chemical reactions between CO2 and another material to produce a liquid or solid species. The efficiency of synthesized ionic liquids for capturing carbon dioxide is ranked as follows, IL104<IL103<IL102<IL101.

Four liquid crystal compounds of the form 2-sec-butyl-4-[(4-X-phenyl) diazenyl) phenyl-4-(octadecyloxy] benzoate symbolized as I18(a), I18(b), I18(c), and I18(d) were prepared in which the substituent (X) was taken CH3O-, CH3-, Br-, and -NO2, respectively. Characterization of prepared compounds is done using FT-IR, H-1-NMR, mass spectroscopy, and elemental analysis. Their mesophase was investigated by differential scanning calorimetry. Their antioxidant efficiency for Egyptian lubricating base oil was tested via monitoring the oxidation reaction through the change in total acid number. The obtained results showed that the efficiency of these compounds was ranked as follows I18(d) > I18(c) > I18(b) > I18(a).

Some benzimidazole derivatives, 2(1-H benzo(d)imidazole-2-y1)thio) N-butyl acetamide Ia, 2(I-H benzo(d)imidazole-2-yl)thio) N-octylacetamid Ib and 2(I-H benzo(d)imidazole-2-yl) thio) N-dodecylactamide Ic were prepared and studied as antioxidants for base stock. The structure of these compounds was elucidated by elemental analysis, IR and 1H NMR spectroscopy. The inhibition efficiency of the prepared compounds was determined by studying the oxidation stability of the local base oil via the change in total acid number (TAN), viscosity and infrared (IR) spectroscopy.

THREE pyridazinone derivatives of the type 4,5-dihydropyridazin- 3(2H)-ones, N-(4-(6-oxo-5- ((5-phenyl-1,3,4-thiadiazol-2-yl) amino) - 1,4,5,6 - tetrahydropyridazin - 3-yl) phenyl) acetamide (4a), 6-(4-chlorophenyl)-4-((5-phenyl-1,3,4-thiadiazol-2yl) amino)-4,5-di-hydropyridazin-3 (2H)-one (4b) and 6-(4-bromophenyl) -4-((5-phenyl-1,3,4-thiadiazol-2-yl) amino)-4,5-dihydropyridazin-3(2H)-one (4c) were synthesized. They were characterized by the conventional tools of analysis, Elemental analysis, IR and H-1-NMR spectroscopy. The tools of analysis confirmed the structure of the three prepared compounds. These heterocyclic compounds are chemically stable and possess multi actions for base oil improvement. They are tested as antioxidants for local base oil through the change in total acid number (TAN). They gave good results as antioxidants for base oil. Also these three synthesized compounds are tested as corrosion inhibitors for carbon steel in acid medium. The efficiency order for these tested compounds is ranked as follows: 4a > 4b > 4c. Energy of the highest occupied molecular orbital (EHOMO) and lowest unoccupied molecular orbital (ELUMO) for the three prepared compounds were calculated via the Ab initio method. Studying of the quantum chemical calculations of the synthesized compounds showed good matching with the experimental results.

Three gemini surfactants were synthesized having the same length of terminal chain but differing in the spacer chain length and they were evaluated as corrosion inhibitors for carbon steel in oilfield water using weight loss, EIS, potentiodynamic polarization and open-circuit potential measurements. These measurements revealed that the synthesized materials have served as effective mixed-type corrosion inhibitors. Their adsorption on a carbon steel surface was well described by means of the Langmuir adsorption isotherm. The activation parameters for the dissolution of carbon steel in solutions of oilfield water in the absence and presence of these inhibitors were calculated. The effect of immersion time on the stability and durability of protective films adsorbed on a carbon steel surface was studied using weight loss method. Ex situ inspection, i.e. post-exposure analysis, for the treated carbon steel surface has been performed using SEM, EDX and FT-IR tools.

In the present paper, four ionic liquids namely:3-Decyl-1-methyl-1H-imidazol-3-ium tetrafluoroborate (IL1), 3-Dodecyl-1-methyl-1H-imidazol-3-ium tetrafluoroborate (IL2), 3-Decyl-1,2-dimethyl-1H-imidazol-3-ium tetrafluoroborate (IL3) and 3-Dodecyl-1,2-dimethyl-1H-imidazol-3-ium tetrafluoroborate (IL4), were synthesized, characterized and tested as corrosion inhibitors for carbon steel in 1.0M HCl solution. The molecular structure and characterizations of these ionic liquids were confirmed by elemental analysis, FTIR, X-Ray Diffraction (XRD), thermo gravimetric analysis (TGA) and 1H NMR spectroscopy. The corrosion performance of the ionic liquids was evaluated by using polarization and electrochemical impedance spectroscopy (EIS) measurements. The compounds presented relatively good inhibition efficiencies at 200ppm. The order of the inhibition efficiency is as follows: IL4>IL3>IL2>IL1. The adsorption of the studied ionic liquids obeyed the Temkin adsorption isotherm.