A kind of optical pH sensor was demonstrated that is based on a pH-sensitive fluorescence dye-doped (eosin) cellulose acetate (CA) thin-film modified microstructured polymer optical fiber (MPOF). It was obtained by directly inhaling an eosin-CA-acetic acid mixed solution into array holes in a MPOF and then removing the solvent (acetic acid). The sensing film showed different fluorescence intens...

Ag nanoflakes were synthesized by chemical reduction method using cetyltrimethylammonium bromide (CTAB) as a surfactant. The results of transmission electron microscope (TEM) analysis, ultraviolet-visible spectroscopic (UV-Vis) X-ray diffraction (XRD) analysis showed that the obtained had size ~50 – 60 nm, thickness 16 with flake shape reached 96 %. particles crystallized in cubic structure Ag....

6.1 Abstract Effect of binding of three surfactants, alpha olefin sulfonate (AOS, anionic), TritonXIOO (TX-100, non-ionic) and cetyl trimethyl ammonium bromide (CTAB, cationic) to the hydrogels of gelatin was studied at room temperature (25°C) by dynamic light scattering and oscillatory rheology with surfactant concentrations (20-1 OOmM) much larger than the critical micellar concentrations (er...

Surface tension, density and conductivity measurements were carried out for systems containing mixtures of cetyltrimethylammonium bromide CTAB) and p-(1,1,3,3-tetramethylbutyl)phenoxypoly(ethylene glycol), Triton X-100 (TX100). The obtained results of the surface tension meaurements were compared with those calculated from the relations derived by Joos, Miller and co-workers. From the compariso...

In this paper, a cloud point extraction method for the determination of trace amounts of Orange II by spectrophotometry is described. The method is based on the extraction of Orange II from aqueous solution using mixed micelles of non-ionic surfactant, Triton X-100 and cationic surfactant cetyltrimethyl ammonium bromide (CTAB) in acidic media. The extracted surfactant rich phase is diluted with...

This work describes a new, low-cost and simple-to-use method for the determination of free biothiols in biological fluids. The developed utilizes interaction with gold ions, previously anchored on micellar assemblies through electrostatic interactions hydrophilic headgroup cationic surfactant micelles. Specifically, reaction AuCl4− cetyltrimethyl ammonium bromide (CTAB) produces an intense oran...

A fluorescence-based method has been developed to detect the structural changes that occur in micelle systems. The sensitivity of fluorescein isothiocyanate (FITC) has been evaluated for (i) detecting the micellization of cetyltrimethyl ammonium bromide (CTAB) and (ii) probing the concentration dependent aggregation, leading to microstructural changes that occur within CTAB micelles. The critic...

Surfactants are often added to water increase the wetting of hydrophobic surfaces. We previously showed that most surfactant solutions behave identically simple liquids with same surface tension, indicating surfactants do not change wettability solid itself. Here, we show superspreading Silwet results in a systematically higher contact angle on than other comparable liquid-vapor tension. also e...

Chelating agents’ application for well stimulation is gaining more and interest, as they can perform under harsh conditions. However, the mutual influence of surfactants chelating agents on wettability alteration hydrophobic carbonate rock conditions high-temperature relatively unexplored. This paper aims to study interfacial processes surface in presence EDTA-based agent different classes. Cat...