D. M. Kuznetsov, D. A. Kuznetsova, F. G. Valeeva, L. Ya. Zakharova
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引用次数: 0
Abstract
New biamphiphilic surfactants (BSs) have been synthesized based on alkylmethylmorpholinium cation and dodecyl sulfate anion (Mor-n(DS), n = 4, 6, 8, 10). The structure of the biamphiphiles has been characterized by IR spectroscopy, 1H NMR spectroscopy, mass spectrometry, and elemental analysis. The aggregation behavior of the biamphiphiles in aqueous solutions has been assessed by tensiometry, conductometry, fluorescence spectroscopy (using a pyrene probe) and dynamic and electrophoretic light scattering. It has been shown that an increase in the hydrophobic tail length by two carbon atoms in an amphiphilic cation leads to an increase in the surface activity of the surfactant by ~5 units and a decrease in the aggregation threshold of the systems by 1.5–2 times. It has been established that the formation of aggregates with hydrodynamic diameters of 20–120 nm depending on the alkyl chain length of the alkylmethylmorpholinium cation and BS concentration. The zeta potential of the systems ranges from –25 to –100 mV and decreases with increasing biamphiphile concentration. Spectrophotometry has been employed to show a significant solubilization capacity of the biamphiphiles with respect to a hydrophobic dye Orange OT. The compounds obtained may be of interest for biomedical applications and other high-tech areas.
期刊介绍：
Colloid Journal (Kolloidnyi Zhurnal) is the only journal in Russia that publishes the results of research in the area of chemical science dealing with the disperse state of matter and surface phenomena in disperse systems. The journal covers experimental and theoretical works on a great variety of colloid and surface phenomena: the structure and properties of interfaces; adsorption phenomena and structure of adsorption layers of surfactants; capillary phenomena; wetting films; wetting and spreading; and detergency. The formation of colloid systems, their molecular-kinetic and optical properties, surface forces, interaction of colloidal particles, stabilization, and criteria of stability loss of different disperse systems (lyosols and aerosols, suspensions, emulsions, foams, and micellar systems) are also topics of the journal. Colloid Journal also includes the phenomena of electro- and diffusiophoresis, electro- and thermoosmosis, and capillary and reverse osmosis, i.e., phenomena dealing with the existence of diffusion layers of molecules and ions in the vicinity of the interface.
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