Structure and Biological Behaviors of Some Metallo Cationic Surfactants

Abstract

In this study, different cationic surfactants were prepared by esterification with bromoacetic acid of different fatty alcohols, i.e., dodecyl, tetradecyl and hexadecyl species. The products were then reacted with diphenyl amine, and the resulting tertiary amines were quaternized with benzyl chloride to produce a series of quaternary ammonium salts. The metallocationic surfactants were prepared by complexing the cationic surfactants with nickel and copper chlorides. Surface tension of these surfactants were investigated at different temperatures. The surface parameters including critical micelle concentration (CMC), maximum surface excess (C max ), minimum surface area (A min ), efficiency (PC 20 ) and effectiveness (p CMC ) were studied. The thermodynamic parameters such as the free energy of micellization (DG mic ) and adsorption (DG ads ), enthalpy (DH m ), (DH ads ) and entropy (DS m ), (DS ads ) were calculated. FTIR spectra and 1 H-NMR spectra were obtained to confirm the compound structures and purity. In addition, the antimicrobial activities were determined via the inhibition zone diameter of the prepared compounds, which were measured against six strains of a representative group of microorganisms. The results indicate that these metallocationic surfactants exhibit good surface properties and good biological activity on a broad spectrum of microorganisms.

New Schiff base cationic surfactants as corrosion inhibitors for carbon steel in acidic medium: weight loss, electrochemical and SEM characterization techniques

“…CMC is considered an important parameter because, at this concentration, most of the physical and chemical characteristics of the surfactant solutions present abrupt variations. It is evident that CMC values decrease as the length of the hydrophobic chains increases; the value is lower for compound II (3.6 9 10 -3 M/L) and higher for compound I (3.9 9 10 -3 M/L) [27]. However, this increase in hydrophobic chain length results in decreased solubility, leading to a concentration of the surfactant molecules at the surface and formation of micelles.…”

Synthesis and Biological Activity of Some Amide-Based Cationic Surfactant complexes with Co (II) and Cu (II)

“…From the relation between the hydrophobic chain lengths and the antimicrobial activities of the tested compounds Ic, IIc, IIIc, Id, IId and IIId, once can explain that their action mode is the diffusion mechanism [26,27].…”

Synthesis, Characterization, and Surface Activity of Some Schiff Base Cationic Surfactant Complexes Against Different Microorganisms

“…It is clear that surface tension decreases by increasing the concentration of the surfactants and the temperature, due to increasing the migration of the surfactant molecules from the bulk to the interface of the solution and also as the temperature increases the surfactants become less soluble due to dehydration of the hydrophobic chain from the solution directed to the surface (Aiad et al, 2012). The values of the surface parameters are given in Table 1, and the CMC values of the prepared cationic surfactants were determined by plotting the surface tension (γ ) of the surfactant solutions versus concentrations in moles per liter at 25, 35, 45, and 55 • C. The CMC values showing a decrease in the CMC with increasing the length of the hydrophobic chains and with increasing the temperature (Adawy and Khowdiary, 2013). Increasing the length of the hydrophobic part decreases the solubility leading to concentration of the surfactant molecules at the surface.…”