We have characterized the phase behavior of mixtures of the cationic surfactant cetyltrimethylammonium bromide (CTAB) and the organic salt 3-sodium-2-hydroxy naphthoate (SHN) over a wide range of surfactant concentrations using polarizing optical microscopy and X-ray diffraction. A variety of liquid crystalline phases, such as hexagonal, lamellar with and without curvature defects, and nematic,...

In this paper, ionic liquid (IL)-coated magnetic Fe(3)O(4) nanoparticles (NPs) as an adsorbent of mixed hemimicelles solid-phase extraction (SPE) was investigated for the preconcentration of polycyclic aromatic hydrocarbons (PAHs) from environmental samples. Due to the high surface area and excellent adsorption capacity of the Fe(3)O(4) NPs after modification with ILs, satisfactory extraction r...

Substances that mimic the enzyme action of glutathione transferases (which serve in detoxification) are described. These micellar catalysts enhance the reaction rate between thiols and activated halogenated nitroarenes as well as alpha,beta-unsaturated carbonyls. The nucleophilic aromatic substitution reaction is enhanced by the following surfactants in descending order: poly(dimethyldiallylamm...

A simple and rapid capillary electrophoresis method for low-molecular mass carboxylic acids measurement in coffee has been optimised and validated. Regarding separation conditions, phosphate concentration in the background electrolyte, surfactant type [cetyltrimethylammonium bromide (CTAB), tetradecyltri methylammonium bromide (TTAB) and hexadimethrine bromide (HDB)], percentages of organic mod...

Niosomes based on the nonionic surfactant Tween 80 and cholesterol modified with cationic surfactants (cetyltrimethylammonium bromide or its carbamate-bearing analog) were formed by thin film hydration method. Such a modification of niosomes provides an increase in their ? potential up to 60 mV, whereas hydrodynamic diameter particles is 100 nm remains nearly unchanged when content varied from ...

Offretite zeolite synthesis in the presence of cetyltrimethylammonium bromide (CTABr) is reported. The offretite crystals were synthesized with a high crystallinity and hexagonal prismatic shape after only 72 h hydrothermal treatment at 180 °C. CTABr has dual-functions during crystallization offretite, viz. as structure-directing agent mesoporogen. resulting crystals, Si/Al ratio 4.1, possess m...

In this paper, biochar was modified by cetyltrimethylammonium bromide (CTAB) and KOH solution, it characterized TGA, FT-IR, XRD, BET, SEM. Then, the (MB) used to immobilize free laccase (FL) adsorption method prepare (MBL). The degradation performance for 2,4-DCP via MB, FL, MBL were studied. results showed that under optimal conditions, rate of MB on up 42.5%, capacity 85.13 mg/g, proved confo...

The interaction of Ti(IV) with 4-(2',3',4'-trihydroxyphenyl)-2-nitro-1-sulfoazobenzene (H3L) in the presence and absence cationic surfactants (CAS) (cetylpyridinium chloride (CPCl), cetylpyridinium bromide (CPBr), cetyltrimethylammonium (CTMABr)) was studied. interval concentration obeying Beer's law is established. In complex formation titanium(IV), dependence A = f(C) expressed by linear equa...

With the growing interest in foamed geopolymer manufacture, there is an increasing demand for tailoring these composites’ pore structure. The binary system of two surfactants offers a possibility enhancing foam formation efficiency and stability paste, however, their effects are not well understood. influence blends on formation, size, distribution fly ash-based matrix investigated synergistic ...