Structure and properties of AOT reversed micelles as studied by the fluorescence probe technique

Absorption and Emission Characteristics of 7-Hydroxycoumarin and 1-Hydroxypyrene-3,6,8-trisulfonate in Water/Oil Microemulsion with Reference to the Determination of the Interfacial and Bulk pH of the Water Pool

“…10 clearly indicate definite breakpoints that depend on the type of microemulsion. Such breaks in the plots of other properties of w/o microemulsions have been reported (21,22), and are in line with the effect of compartmentalization herein discussed. It may be mentioned that the pH of the water used in the experiments measured by the HPTS method was found to be 6.10 (a pH of 6.10 was also measured with a pH-meter); that of the aqueous solution of AOT (at 10 mM, five times its CMC) was found to be 6.25.…”

Energy Gap Dependence of the Nonradiative Decay Rate Constant of 1-Anilino-8-naphthalene Sulfonate in Reverse Micelles

“…So far, a number of spectroscopic studies have been reported on reverse AOT micelles. [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] However, detailed discussion based on k nr has been rarely explored. The present study showed clearly that detailed analysis of the photophysical parameters was essential to discuss fluorescence characteristics of a probe molecule in reverse micelle systems.…”

“…As one of the several advantages of a reverse AOT micellar system, the size of the water pool can be controlled precisely at the nanometer level through the molar ratio of water to AOT: 7 Therefore, size effects on chemical and physical properties in nanometer dimensions can be studied by the use of reverse AOT micelles. Indeed, reverse AOT micelles have been studied by various techniques such as fluorescence spectroscopy [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] , NMR 22,23 , ESR 24,25 , IR [26][27][28] , and so on. [29][30][31][32] These studies demonstrated that polarity [8][9][10] , viscosity 11 , pH 12 , and other properties 30,32 of the water pool in the micelles were different from those in the bulk state and were dependent on the w 0 value.…”

New Approaches to Liquid Interfaces through Changes in the Refractive Index and Nonlinear Susceptibility Utilizing Ultrashort Laser Pulses

“…AuO has been widely used as a viscosity probe molecule, and its relaxation process is remarkably affected by the surrounding environments. 18 In addition, because AuO is a cationic dye and AOT is an anionic surfactant, we considered that AuO is preferentially located in the interfacial area due to the electrostatic interaction. Photoexcited AuO relaxes via two intermediate states, that is, the first-formed emissive locally excited (LE) state and a nonemissive twisted intramolecular charge transfer-like (TICT-like) state ( Fig.…”