Cyclohexane n hexanol water in oil emulsion12/10/2023 ![]() The o/w microemulsions are, on the other hand, transparent, isotropic liquid media with nanosized oil droplets that are dispersed in a continuous aqueous phase and stabilized by cosurfactant molecules (less than w/o microemulsion). It should be noted that w/o microemulsions are transparent, isotropic liquid media with nanosized water droplets that are dispersed in continuous oil phase and stabilized by co-surfactant molecules at the water/oil interface. However, there are still challenges such as the instability of the microemulsions, control of their aggregates size and uniform dispersity. Research to date includes numerous attempts to prepare microemulsions and characterize them. Extensive reviews on the physicochemical and electrochemical characterization of microemulsion are available. During the past few years, preparation of the nanomaterials employing microemulsion systems is emerging as a potential area of interest. Since the microemulsions usually exhibit unusual optical properties, significantly different from those of the emulsions due to their extremely small sizes of self-assembled aggregates and large surface areas, thermodynamic stability, ease of preparation, higher solubility and good appearance. The preparation and characterization of micro-emulsions have received an upsurge of interest from many researchers in diversified areas for example: Chemistry, Physics, Nano-material Science, Biology and the corresponding Engineering. Keywords: Preparation, Characterization, SDS, CTAB, W/O and O/W Microemulsions, CMC, Water Solubilization Detailed analysis of the conductivity, density and aggregation number, it can be tuned by changing composition of microemulsions and suitable compositions of microemulsions must be employed for the preparation of nanomaterials. The results obtained show that N values which range 78–101 for SDS based aggregates and range 99-160 for CTAB based aggregates show a linear relationship with the concentration of surfactant. As the quenching process of SDS based aggregates was very effective, however that of CTAB was less pronounced, the aggregation number of SDS based aggregates had been found to be comparatively lower than that of CTAB under similar experimental conditions. ![]() However, an increase in the number of reverse micellar aggregates in the system brought about gradual decrease of the aggregation number. Aggregation number had been found to increase as the number of micellar aggregates increases. The aggregation number of the aggregates in the microemulsions varied with composition of the microemulsions and depends only on the concentration of surfactant present in the systems. Steady-State Fluorescence Quenching method had been employed to determine the aggregation number, N of the organized self-assembled aggregates. Lower conductance and density are characteristics for w/o microemulsions having high 1-butanol content while in o/w microemulsions leads higher conductance and density. Specific conductance, density and aggregation number had been used to characterize SDS and CTAB based microemulsions and the microemulsions prepared by non-ionic surfactant, tween 80 were characterized by only density measurement. The reverse cmc values are smaller (0.204-0.293M) than the micellar cmc (0.4605-0.607M) was observed.1-butanol as a stabilizer provided information of the systems to give thermodynamically stable transparent w/o and o/w microemulsion due to its low linear thickness. The ability of these aggregates to solubilize water had been employed for the detection of the critical micellization concentration, cmc for micelles and reverse cmc for reverse micelles. Micelles and reverse micelles are dominant form of self-assembled aggregates in o/w microemulsions and w/o microemulsions respectively. Abstract: Series of water in oil (w/o) composition of microemulsions were prepared from systems with sodium dodecyl sulphate (SDS), 1-butanol, cyclohexane, water tween 80, 1-butanol, cyclohexane, water and cetyltrimethylammonium bromide (CTAB), 1-butanol, cyclohexane, water at varying water to surfactant mole ratio, w0 and oil in water (o/w) composition of SDS and CTAB based microemulsions were made at reconcile with composition of w/o microemulsions.
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