Effect of organized assemblies

Organization of amphiphiles. Part XI: Physico-chemical aspects of mixed micellization involving normal conventional surfactant and a non-ionic gemini surfactant

“…TritonX-100 even though a non-ionic one, shows a negative potential possibly due to the large number of oxygen atoms of the oxyethylene groups. Literature survey also reveals the similarities of the microenvironment of anionic surfactants and polyoxyethylated non-ionic surfactants [29,[64][65][66]. While probing the micelles of a series of polyoxyethylated non-ionic surfactants [64] and anionic surfactant SDS through the measurements of pK of a number of aldimines we have observed the similarities in the environment provided by these two categories of surfactants.…”

“…Literature survey also reveals the similarities of the microenvironment of anionic surfactants and polyoxyethylated non-ionic surfactants [29,[64][65][66]. While probing the micelles of a series of polyoxyethylated non-ionic surfactants [64] and anionic surfactant SDS through the measurements of pK of a number of aldimines we have observed the similarities in the environment provided by these two categories of surfactants. Using lipoid pH indicators as probes Fernadez and Fromherz [65] have made similar observations during the measurement of the electrical potential and polarity of SDS and TX-100 micelles.…”

Organization of amphiphiles

“…From earlier studies [19,20] we have seen that CTAB forms a micelle with some fatty patches exposed to water [62]. Studies on the hydroxylation of Rosaline hydrochloride in the presence of CTAB [19] suggest that about 9% of hydrophobic patches are exposed to water.…”

“…OP-30 with 30 oxyethylene units as its hydrophilic moiety and a phenyl ring in its nonpolar part is judiciously selected because of its applications in industrial and household processes [17,18]. In our earlier studies [19,20] we have also seen that this type of polyoxyethylated alkyl surfactants aggregates with substantial exposure of their hydrophobic groups to the bulk water and hence they can be readily accessible to the incoming substrates for hydrophobic interaction. In order to investigate the role of the molecular state of the surfactants on the interactions, the process of micelle formation of CTAB has been studied in the presence of OP-30, both below and above its critical micelle concentration (CMC).…”

Organization of Amphiphiles, Part IX: Effect of Molecular Structure of Cosurfactants and Oils on the Phase Behavior of Tween-80: Alkanol-Oil-Water Systems

“…The central cis double bond in the oleyl group of Tween-80 may also introduce a kink during the packing at the interface. [10,46,47] As the emulsifier is added to an immiscible solution of oil two conjugate solutions [21] are formed due to the partitioning of emulsifier to both oil and water phase: a saturated solution of oil in water (rich in water) and other saturated solution of water in oil (with rich in oil). The location of plait point P; the point at which the two conjugate solutions have the same composition, closer to EO line (Figure 2) also conforms to the relatively more solubility of emulsifier in water than in oil.…”