Synthesis and characterization of newly cationic surfactants based on 2-(2-(dimethylamino)ethoxy)ethanol: physiochemical, thermodynamic and evaluation as biocide

Efficiency of Gemini surfactant containing semi-rigid spacer as microbial corrosion inhibitor for carbon steel in simulated seawater

SRB is one of the main bacteria causing marine microbial corrosion. In order to reduce the loss of microbial corrosion, a Gemini surfactant (12-B-12) containing semi-rigid spacer was used to investigate the anti-bacterial and anti-corrosion performances of carbon steel in simulated seawater by weight-loss test, electrochemical method and surface morphology analysis. The results showed that the inhibition efficiency of 0.01 mM 12-B-12 was as high as 98.3% after 30 days of incubation in simulated seawater with SRB, and the planktonic and sessile SRB on the carbon steel surface can be reduced to undetectable level. Quantum chemical calculation and molecular dynamics simulation were used to study the structure-activity relationship.

Multiple Applications of a Novel Cationic Gemini Surfactant: Anti-Microbial, Anti-Biofilm, Biocide, Salinity Corrosion Inhibitor, and Biofilm Dispersion (Part II)

The Egyptian petroleum industries are incurring severe problems with corrosion, particularly corrosion that is induced by sulfidogenic microbial activities in harsh salinity environments despite extensively using biocides and metal corrosion inhibitors. Therefore, in this study, a synthesized cationic gemini surfactant (SCGS) was tested as a broad-spectrum antimicrobial, anti-bacterial, anti-candida, anti-fungal, anti-biofilm (anti-adhesive), and bio-dispersion agent. The SCGS was evaluated as a biocide against environmental sulfidogenic-bacteria and as a corrosion inhibitor for a high salinity cultivated medium. The SCGS displayed wide spectrum antimicrobial activity with minimum bactericidal/fungicidal inhibitory concentrations. The SCGS demonstrated anti-bacterial, anti-biofilm, and bio-dispersion activity. The SCGS exhibited bactericidal activity against environmental sulfidogenic bacteria and the highest corrosion inhibition efficiency of 93.8% at 5 mM. Additionally, the SCGS demonstrated bio-dispersion activity against the environmental sulfidogenic bacteria at 5.49% salinity. In conclusion, this study provides a novel synthesized cationic surfactant with many applications in the oil and gas industry: as broad-spectrum antimicrobial and anti-biofilm agents, corrosion inhibition for high salinity, biocides for environmentally sulfidogenic bacteria, and as bio-dispersion agents.

“Sweet” ionic liquids comprising the acesulfame anion – synthesis, physicochemical properties and antifeedant activity towards stored product insects

The synthesized “sweet” ionic liquids comprising acesulfame anion proved to be effective antifeedants with designer physicochemical properties.

Evaluation of Some New Synthesized Surfactants Based on Maleic Acid as Inhibitors for Low Carbon Steel (LCS) Corrosion in 1.0 M HCl Solution

Some surfactants were synthesized, its chemical structures were checked using Fourier transform infrared spectroscopic (FT-IR). The investigation of inhibition efficiency (IE%) for dissolution of (LCS) in 1.0 M HCl with and without various concentrations of these compounds were done using electrochemical and non-electrochemical methods. Measured data depends on temperature, concentration, and nature of the substance. These compounds were adsorbed on LCS surface following Temkin isotherm. Polarization studies illustrated that these surfactants act as mixed inhibitors (anodic and cathodic). The effect of these inhibitors on LCS surface morphology’s was detected by Scanning Electron Microscope (SEM), ATR-IR (Attenuated total reflection Infra-red) and Atomic Force Microscopy (AFM) techniques. The parameters in an activated state of LCS were studied and estimated. All data techniques were compatible and matched.

The adsorption and aggregation properties of dendritic cationic tetrameric surfactants

A series of dendritic cationic tetrameric surfactants (4C_ntetraQ, n = 12, 14, 16) were synthesized with raw materials that are commercially available.