Abstract
Effect of cosurfactant concentration on the location of a dissolved solute in a block copolymer-surfactant supramolecular system has been investigated using time-resolved fluorescence anisotropy and dynamic Stokes' shift measurements. Pluronic F88 and cosurfactant CTAC have been used to form a supramolecular assembly. The anion of coumarin 343 dye has been used as the solute/probe. It is seen that as the CTAC concentration is increased in the F88-CTAC supramolecular assembly, the microviscosity around the probe gradually increases. The result suggests that the probe undergoes a gradual migration from micellar surface to the interior of the micelle as the concentration of the CTAC is increased. This is also supported by the dynamic Stokes' shift results. It is seen that as the CTAC concentration is increased in the system, the observed Stokes' shift gradually increases due to the movement of the probe away from the bulk water. By comparing the present results with those reported in another pluronic-surfactant system, namely, P123-CTAC, it is indicated that the extent of modulation in the position of the probe in such supramolecular systems is largely determined by the composition of the pluronic, especially on the length of its hydrophilic ethyleneoxide block.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
