Synthetic insecticides have a direct adverse effect on the natural enemies and long-term residual effects causing serious
environmental pollution as well. Public awareness of a clean environment increased the attention to developing alternative
eco-friendly approaches. The objectives of this study are the detection of the effect of Beauveria bassiana, Metarhizium
anisopliae, and natural products of plant-extract origin on the fall armyworm Spodoptera frugiperda (Lepidoptera: Noctuidae)
under laboratory conditions. The drench-bioassay results showed that mortality of larvae by B. bassiana KACC40224
increased from 10 to 80% as the dose was increased from 10 × 105
to 10 × 109
conidia ml−
1. However, mortality by M.
anisopliae KACC40029 reached maximally 60% at the dose of 10 × 109
conidia ml−
1. All natural-extract products tested
against the insect pest were effective, except lavender oil, which caused mortality to vary between 10 and 100%. Rosemary
oil was found to be the most effective essential oil, showing 10% to 100% mortality indices at a concentration of 0.1 and
0.2% (v/v), respectively. S. frugiperda eggs tend to be more susceptible to entomopathogenic fungi rather than the larvae.
The essential oils exhibited significant insecticidal properties against the larvae of S. frugiperda. This study could help in
the development of potential biopesticides for the environment-friendly management of the fall armyworm S. frugiperda
pest and emphasize the advantages of entomopathogenic fungi application.

Three bis(3-schiff base-indoline-2-one) derivatives, 3(a-c), and two bis-spirotriazole-indole derivatives, 5(a,b), were synthesized and were evaluated as inhibitors for the corrosion of Al in 1.0 M HCl at 303 K. Weight loss (WL) method was applied for evaluation of the inhibition efficiencies (% IEs) of all synthesized compounds while WL in addition to potentodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) were employed in case of the compound that has the highest% IE values. The collected results illuminated that the synthesized compounds were discovered to be efficient inhibitors and their% IEs were set to vary with their concentrations, structures, and the corrosive medium concentration. WL outcomes revealed that, the order of% IEs of the synthesized compounds was: 5a ≈ 5b > 3a > 3b ≥ 3c. The acquired high% IEs of such compounds were attributed to their potent adsorption on the Al surface and production of a protective film, and this adsorption was agreed with Langmuir adsorption isotherm. The kinetics of corrosion inhibition by the synthesized compounds appeared a negative-first order process confirming the gained higher values of% IEs of such compounds. PDP results indicated that the compound 5a behaves as a mixed inhibitor with a cathodic majority. The results acquired from the three utilized tools were set to be in a good agreement with each other’s confirming the validity of the obtained results.

Metal surfaces can become damaged by corrosion when they interact with their surround‑ ings, leading to huge financial losses. The use of corrosion inhibitors is one of the most crucial ways to combat the risky and hazardous effects of corrosion. In the present research, electrochemical tech‑ niques and surface analysis have been used to characterize the inhibition properties of (3‑hydroxy‑ 4‑((4‑nitrophenyl)diazenyl)‑5‑(phenylamino)thiophen‑2‑yl)(phenyl)methanone for the corrosion of carbon steel in an aerated 1.0 M HCl solution. Steel’s corrosion resistance was discovered to be im‑ proved by the presence of the examined inhibitor in 1.0 M HCl medium through the adsorption of the inhibitor species to create a barrier layer. The findings showed that when inhibitor concentrations increased and solution temperatures decreased, the inhibition performance (%IE) of the compound under study enhanced. In the light of inhibitor probe’s chemical makeup and theoretical analysis, the mechanism of the inhibition process was addressed. In a 1.0 M HCl solution containing 5 × 10−5 M of the inhibitor, the inhibition performance, at room temperature, was found to be almost 97%. The electrochemical results revealed that the examined compound successfully prevented carbon steel corrosion as a mixed‑type inhibitor. The Langmuir and Freundlich isotherms are pursued by the adsorption of the examined inhibitor. Additionally, using Arrhenius and transition state equations, the activation thermodynamic parameters ∆Ea, ∆H*, and ∆S* were determined and explained. The adsorption process was illustrated using DFT computation and MC simulations. The experimen‑ tal findings and theoretical simulations concurred surprisingly well. Finally, the paper presents a discussion of the inhibitory mechanism.

During the mandatory acidification process in the oil and gas industry, carbon steel unfortunately suffers significant corrosion damage. From this perspective, for the first time a new ionic liquid called 1-(2-(4-bromophenyl)-2-oxoethyl)-4-(tert-butyl)pyridin-1-ium bromide (ILB) has been used as an effective inhibitor for the carbon steel corrosion in aggressive HCl solution (15%) at 298 K. The experiments were managed with a number of different chemical and electrochemical techniques including weight loss, potentiodynamic polarization (PDP), and impedance spectroscopy (EIS). ILB has good inhibitory performance as an acidizing corrosion inhibitor for carbon steel even at low dosing levels of 1 × 10−3 M. The findings were promising as an inhibition efficiency of about 97% was achieved when ILB was added at low concentrations to the corrosive media. EIS results showed a significant rise in charge transfer resistance (Rct) values with increasing doses of ILB. PDP studies confirmed that ILB is a mixed type and obey Langmuir adsorption isotherm with chemical nature. The metal surface morphologies were inspected using a Scanning Electron Microscope (SEM) and an Atomic Force Microscope (AFM). Additionally, Density Functional Theory (DFT) and Molecular Dynamic Simulation (MDS) indicates that ILB molecules function as inhibitors more successfully. There is a high degree of concordance between practical and theoretical studies

Reinforcing steel (RS) is mainly used in building construction and many industries, but it suffers from corrosion problems, especially in acidic environments. Biopolymers are characterized by their unique chemical composition, as they contain a variety of functional groups that are capable of binding strongly to the metal surface and forming a protective layer on it. Herewith, two biopolymers, viz. dextrin (Dex) and inulin (Inu), were tested as eco-friendly inhibitors for the corrosion of RS in 1.0 M HCl medium at different temperatures. Various experimental tools were utilized in this research. The inhibition efficiencies (% IEs) of the tested polymeric compounds were improved by increasing their doses while reducing with rising temperature. The % IEs of Dex and Inu at a dose of 500 mg/L reached 85% and 93%, respectively. The examined biopolymers displayed cathodic/anodic behavior (mixed type) with a foremost anodic one. The acquired higher % IEs were demonstrated by intense adsorption of Dex and Inu on the RS surface fitting the Langmuir isotherm. The influence of rising temperature in the range of 288–318 K on the corrosion behavior was examined, and the evaluated thermodynamic and kinetic parameters sustained the mechanism of physical adsorption of the polymeric inhibitors. Additionally, the kinetics of corrosion, as well as its inhibition by Dex and Inu, were also investigated. The SEM micrographs of the RS surfaces were accorded with all utilized experimental tools. The results gained from all used tools were discovered to be in good agreement with each other.

Herein, the inhibition impacts of chitin, pectin, and amylopectin as carbohydrate polymers on the corrosion of mild steel in 0.5 M HCl were researched utilizing various experimental and theoretical tools. The acquired outcomes showed that the inhibition efficiencies (% IEs) of the tested carbohydrate polymers were increased by raising their concentrations and these biopolymers acting as mixed-kind inhibitors with major anodic ones. The acquired % IEs values were reduced with rising temperature. The higher % IEs of the tested polymers were inferred via powerful adsorption of the polymeric molecules on the steel surface and such adsorption obeyed the Langmuir isotherm. The computed thermodynamic and kinetic quantities confirmed the mechanism of physical adsorption. The kinetics and mechanisms of corrosion and its protection by polymeric compounds were illuminated. The results obtained from all the techniques used confirmed that there was good agreement with each other, and that the % of IEs followed the sequence: chitin > amylopectin > pectin.

This study investigated diferent amino acid-based surfactants (AASs), also known as biosurfactants, including sodium N-dodecyl asparagine (AS), sodium N-dodecyl tryptophan (TS), and sodium N-dodecyl histidine (HS) for their potential anticorrosion, antibacterial, and antidermatophyte properties. The chemical and electrochemical techniques were employed to examine the copper corrosion inhibition efcacy in H2SO4 (1.0 M) solution at 298 K. The results indicated their promising corrosion inhibition efciencies (% IEs), which varied with the biosurfactant structures and concentrations, and the concentrations of corrosive medium. Higher % IEs values were attributed to the surfactant adsorption on the copper surface and the production of a protective flm. The adsorption was in agreement with Langmuir adsorption isotherm. The kinetics and mechanisms of copper corrosion and its inhibition by the examined AASs were illuminated. The surfactants behaved as mixed-kind inhibitors with minor anodic priority. The values of % IEs gained from weight loss technique at a 500 ppm of the tested surfactants were set to be 81, 83 and 88 for AS, HS and TS, respectively. The values of % IEs acquired from all the applied techniques were almost consistent which were increased in the order: TS>HS≥AS, establishing the validity of this study. These surfactants also exhibited strong broad-spectrum activities against pathogenic Gram-negative and Gram-positive bacteria and dermatophytes. HS exhibited the highest antimicrobial activity followed by TS, and AS. The sensitivity of pathogenic bacteria varied against tested AASs. Shigella dysenteriae and Trichophyton mantigrophytes were found to be the most sensitive pathogens. HS exhibited the highest antibacterial activity against Shigella dysenteriae, Bacillus cereus, E. coli, K. pneumoniae, and S. aureus through the formation of clear zones of 70, 50, 40, 39, and 35 mm diameters, respectively. AASs also exhibited strong antifungal activity against all the tested dermatophyte molds and fungi. HS caused the inhibition zones of 62, 57, 56, 48, and 36 mm diameters against Trichophyton mantigrophytes, Trichophyton rubrum, Candida albicans, Trichosporon cataneum, and Cryptococcus neoformans, respectively. AASs minimal lethal concentrations ranged between 16 to 128 µg/ml. HS presented the lowest value (16 µg/ml) against tested pathogens followed by TS (64 µg/ml), and AS (128 µg/ml). Therefore, AASs, especially HS, could serve as an efective alternative antimicrobial agent against food-borne pathogenic bacteria and skin infections-associated dermatophyte fungi.