The objective of this study is to analyze the effects using surfactant (CTAB) and cellulose nanofibers (NFC) as an admixture in cement mortars. We examined composite properties porosity, compression energy, thermal conductivity hydration. results showed that with addition 0.7% by weight NFC per emulsion presence a cationic (CTAB). new material produced presented dry porosity between 4.7% 4.4%, ...

The purpose of this study was to determine the acid dissociation constants (pKa) of meloxicam in the presence of various surfactants including sodium lauryl sulfate (SLS) as an anionic surfactant, cetyltrimethylammonium bromide (CTAB) as a cationic surfactant and Triton® TX-100 (TX-100) as a non-ionic surfactant in different pre-determined concentrations. The related pKa was determined spec...

wettability alteration is an important method for increasing oil recovery from oil-wet carbonatereservoirs. chemical agents like surfactants are known as wettability modifiers in carbonate systems.oil can be recovered from initially oil-wet carbonate reservoirs by wettability alteration from oil-wetto water-wet condition with adding dilute surfactant and electrolyte solutions. this paper invest...

This paper reports application of cetyltrimethylammonium bromide (CTAB) coated magnetite nanoparticles (Fe3O4 NPs) as a novel adsorbent for removal of two types of disperse dyes, including disperse red 167, and disperse blue 183, from wastewater of textile companies. The effect of parameters including type of surfactant, pH of solution, surfactant concentration, and amount...

A wide variety of surfactant molecules self-assemble in solution to form very long flexible micelles. While great progress has been made in understanding the flow behavior of such systems [1], there exists a large class of wormlike micellar solutions which exhibit anomalous behavior, namely, a dramatic increase in viscosity above a critical shear rate and a concomitant decrease in the turbulent...

Surfactant flooding is a proven method employed to improve the recovery of crude oil from subsurface reservoirs but knowledge about microemulsion formation, factors related their stability, and trapping mechanism components in still not clear for designing injection fluid specific type. The interaction mechanisms four oils with surfactant-brine solutions were studied this work better insight in...

The advantages of microwave technology over conventionally conducted experiments are numerous. Some them reduction in reaction time, a higher degree process control, repeatability, and work safety. Microwave synthesis routes require complete description the experimental details, instrumentation, design program oven used experiments. In this work, microwave-assisted hydrothermal hematite (?-Fe2O...

A comparative study was made between developed chemically modified carbon paste electrodes and PVC membrane electrodes for the cationic surfactant cetyltrimethylammonium bromide (CTAB). The carbon paste electrode modified with cetyltrimethylammonium-tetrachloropalladate(II) (CTA-TClP) provides a more sensitive and stable device than that shown by electrodes with an inner reference solution. The...

The interactions between an anionic dye, Acid Green 25 AG and the two cationic surfactants tetradecyltrimethylammonium bromide TTAB, and hexadecyltrimethylammonium bromide CTAB in aqueous solutions far below the CMC are studied using the conductometric method at different temperature. The equilibrium constants and other thermodynamic functions for the process of dye-surfactant ion pair formatio...