Synthesis, surface active and thermal properties of novel imidazolium cationic monomeric surfactants

4,4'-(((1E,5E)-pentane-1,5-diylidene)bis(azanylylidene))bis(1-dodecylpyridin-1-ium) bromide as a novel corrosion inhibitor in an acidic solution (part I)

The metal corrosion inhibition efficiency of a novel synthesized cationic gemini surfactant (SCGS), namely, 4,4'-(((1E,5E)-pentane-1,5-diylidene)bis(azanylylidene))bis (1-dodecylpyridin-1-ium) bromide, was studied in acidic medium by three techniques. The achieved results displayed the inhibition efficiency of the metal corrosion that was elevated by increasing both the SCGS's concentration and the applied temperature values. Furthermore, it was noticed that the charge transfer resistance value was elevated; however, the constant phase element was decreased with increasing the SCGS concentrations. The SCGS regards an excellent and mixed-type corrosion inhibitor. The adsorption of SCGS has agreed the Langmuir's adsorption isotherm and was related to physisorption and chemisorption.

Synthesis, thermal and surface activity of cationic single chain metal hybrid surfactants and their interaction with microbes and proteins

A series of water-soluble metal functionalized surfactants have been prepared using commercially available surfactant cetyl pyridinium chloride and transition metal salts. These complexes were characterized in the solid state by elemental analysis, FTIR, 1H NMR and thermogravimetric analysis. The interfacial surface activity and aggregation behaviour of the metallosurfactants were analysed through conductivity, surface tension and small angle neutron scattering measurements. Our results show that the presence of metal ions as co-ions along with counter ions favours micellization at a low critical micellization concentration (CMC). Small angle neutron scattering revealed that the metallomicelles are of a prolate ellipsoidal shape and exhibit strong counterion binding. This article further describes the interaction of the metallosurfactants with transport protein Bovine Serum Albumin (BSA) using different spectroscopic techniques. A spectroscopic study was used to study the binding, interaction and quenching mechanism of BSA with the metallosurfactants. Gel electrophoresis (SDS-PAGE) and circular dichroism (CD) investigated the structural and conformational changes produced in BSA due to the metallosurfactants. The results indicate that there is an alteration in the secondary structure of BSA due to the electrostatic interaction between positive head groups and metal co-ions of the metallosurfactants and negatively charged amino acids of BSA. As the concentration increases, the α-helicity of BSA decreases and all the three studied metallosurfactants gave comparable results. Finally, the in vitro cytotoxicity and antimicrobial activity of the metallosurfactants were evaluated against erythrocytes and microorganisms, which showed prominent effects related to the presence of a metal ion in metallomicelles of the hybrid surfactants.

Insights into the complex interaction between hydrophilic nanoparticles and ionic surfactants at the liquid/air interface

The effect of interaction between hydrophilic nanoparticles and ionic surfactants on the liquid/air interfacial properties has been investigated, and a possible mechanism has also been proposed.

Synthesis, Surface and Biological Activities of Cationic Surfactants Based on Glycine Moiety

Two series of cationic surfactants based on glycine molecule as sulfonate salt of N,N-diethyl glycine fatty esters having a hydrocarbon chain length of C12,C16 and C18 followed by quaternerization with ethyl iodide were synthesized. Their chemical structures were confirmed using IR,1H-NMR, and mass spectroscopy. The surface activity of these amphiphiles has been determined by measurement of their surface tension. Parameters like surface tension (γ), critical micelle concentration (cmc), effectiveness (Πcmc), efficiency (pC20), maximum surface excess (Γmax), minimum surface area (Amin) and Gibbs free energy of the micellization (ΔGmic) and adsorption (ΔGads) have been determined from the measurements obtained by surface tension method. All these surfactants showed much lower CMC values compared to the similar hydrophobic chain length surfactant. All synthesized compounds have been evaluated for their biological activity against bacteria and fungi.

N-(3-(Dimethyl benzyl ammonio)propyl)alkanamide chloride derivatives as corrosion inhibitors for mild steel in 1 M HCl solution: experimental and theoretical investigation

The effects of the synthesized cationic surfactants corrosion inhibitiors DMBL, DMBM and DMBP on the corrosion of mild carbon steel in acidic medium (1.0 M HCl) were investigated using weight loss and electrochemical measurements.