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- W2053485197 abstract "The photophysics of a fluorescent drug Piroxicam was used to probe the intramicellar region of nonionic microemulsions of Triton X-100/cyclohexane—hexanol/water, using both steady-state and transient (picosecond resolution) techniques. A protic and polar interface, as inferred from the calculated Kamlet-Taft parameters (α and π*), interacts with the probe as a Lewis base. Three distinct spectroscopic species were detected with pH-dependent contributions. Such dependence is noted only above a certain water concentration (ω0=8), confirming the existence of water pools thereafter. Transient data lead to similar conclusions. A global analysis of the fluorescence decays was made and three different lifetimes were obtained. The shortest (τ1=16 ps) and the longest (τ3=2.02 ns) correspond to those already found in free aqueous solution. An intermediate component (τ2=72 ps), whose importance grows with the amount of solubilized water at pHext 4, is thought to represent a less protic and more rigid environment, which is sensed by the probe. An increase in the microviscosity values also detected by fluorescence anisotropy and the lower α and π*, calculated 0.5 and 0.7, respectively, contribute to this statement. Major changes observed in the system around ω0=8 are emphasized, taking into account a dynamic light-scattering study, where a dependence of the hydrodynamic radius on the observation angle is detected above this water content." @default.
- W2053485197 created "2016-06-24" @default.
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- W2053485197 date "2000-06-01" @default.
- W2053485197 modified "2023-09-30" @default.
- W2053485197 title "STRUCTURAL CHANGES IN W/O TRITON X-100/Cyclohexane-Hexanol/Water Microemulsions Probed by a Fluorescent Drug Piroxicam" @default.
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- W2053485197 doi "https://doi.org/10.1006/jcis.2000.6821" @default.
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