Probing solvation dynamics at the interface of reverse and normal aerosol-OT self assembled micelle systems

PHYS 347

George R. Bullock and Nancy E Levinger, levinger@lamar.colostate.edu. Department of Chemistry, Colorado State University, Fort Collins, CO 80523-1872
The solvation dynamics at the surface of both normal and reverse Aerosol-OT (AOT) was explored. These self assembled micelle systems have been used extensively to investigate restricted environments, liquid-liquid interfaces and as models for biological structures. We have synthesized an amphiphilic solvation dynamics probe molecule, coumarin labeled dodecylamine (CLDA) by attaching the alkyl amine to a standard coumarin probe. The alkyl tail anchors CLDA into the micelles and allows comparison between interfaces in normal and reverse micelles. Results from steady state absorption and fluorescence spectra as well as the time-resolved fluorescence anisotropy measurements of CLDA in AOT micelles along with comparisons to the free dye demonstrate the effectiveness of CLDA as a solvation dynamics probe. This presentation will compare and contrast results from experiments employing the CLDA to determine the solvation dynamics at the surface of both normal and reverse AOT micelles