Physikalische Chemie - Direktor: Prof. Dr. Martin Wolf
Host: Julia Stähler
Wednesday, March 9, 2022, 11:00 am
Indian Institute of Technology Kanpur · Department of Chemistry
Tracking Wormlike Micelle Formation in Solution: Unique insight through Fluorescence Correlation Spectroscopy
The worm-like micelles were found about 25 years ago but its formation pathway remains unclear. A single molecular level experiment can provide meaningful and additional information to understand this interesting system, especially in a heterogeneous subpopulation. Here, I am presenting a single molecular level study on the formation of wormlike micelles by cetyltrimethylammonium bromide (CTAB) and sodium salicylate (NaSal) in water. The results of this study indicated coexistence of normal spherical micelles along with a big wormlike micelle in its formation path. Further, the results also indicated two unique insights into the formation mechanism, which are inaccessible in ensemble-averaged experiments: (i) at extremely low concentrations of the surfactant, [CTAB]/[NaSal]=0.06, the wormlike micelle attains the highest size; and (ii) the relative concentration of wormlike micelles is highest when [CTAB]/[NaSal]=2.