Locations of methanol in methanol-containing AOT reverse micelles revealed by photophysics of IR125

Phase Stability and Miscibility in Ethanol/AOT/n-Heptane Systems: Evidence of Multilayered Cylindrical and Spherical Microemulsion Morphologies

“…Thus, it was concluded that stable methanol/AOT/ n -heptane reverse micelles form, but methanol is distributed among the different regions in the micellar system and not exclusively found in the micellar cores. Finally, from measurements of steady-state absorption, steady-state fluorescence, and time-resolved fluorescence spectroscopies of IR125 in methanol/AOT/ n -heptane systems, Lu et al concluded that reverse micelles encapsulating methanol form, in agreement with the conclusions drawn by Riter et al and Setua et al. …”

“…Although they attributed their results to the formation of reverse micelles, each type of methanol interactions could alternatively be attributed to short-chain alcohol behaviors we observed from MD simulations, with some alcohol forming bonds at the AOT/heptane interface of AOT aggregates, while the rest self-associates forming alcohol clusters and/or layers in more complex structures with AOT. Results from dye photophysics such as those presented by Lu et al , which are measurements of short-range environment polarity, have no evidence that polarity is being measured within a micellar core. In fact, Ganguly et al studied systems with the same compositions and noted that the dye photophysics behaviors were nearly identical for the binary methanol/ n -heptane system as those for the ternary methanol/AOT/ n -heptane system.…”

“…The methanol/AOT/ n -alkane system has been the subject of debate for nearly two decades. ,,,− Riter et al initially concluded that reverse micelles with methanol cores form in a system containing AOT and either isooctane or decane using dynamic light scattering (DLS) and steady-state absorption of the fluorescent probe Coumarin 343. However, they also observed that these solutions do not support large micelle sizes and therefore do not increase in size with increased methanol content.…”

Photoisomerization and reorientational dynamics of DTDCI in AOT/alkane reverse micelles containing non-aqueous polar liquids

“…[1][2][3] In fact, a polar liquid immiscible with non-polar solvents can get encapsulated inside the RMs, the most common example being water. [1][2][3] In recent times, the scope of such encapsulation has widened dramatically to include polar liquids like glycerol (GY), [3][4][5][6][7] ethylene glycol (EG), [3][4][5][6][8][9][10][11] propanediol, 1,11 formamide (FA), [3][4][5][6]10,12 dimethylformamide (DMF), 3,5,6,11 dimethylacetamide, 3,5,6 methanol 10,[13][14][15][16][17][18] and acetonitrile. 10,[15][16][17][18] In these systems, the polar liquid remains dispersed as AOT-coated droplets in the non-polar solvent.…”

“…3 Thus, AOT reverse micelles and microemulsions open up exciting prospects for physico-chemical processes confined in a nano-dimensional droplet. Consequently, they have proved to be important in spectroscopy, 5,6,[11][12][13][14][15][16][17][18][20][21][22] catalysis, [22][23][24] biochemistry [23][24][25] and nanoparticle fabrication. [26][27][28] In particu- Department of Chemistry, University of Calcutta, 92, APC Road, Kolkata 700 009, India.…”