Time-resolved fluorescence quenching in micellar assemblies
- Katholieke Univ. Leuven, Heverlee (Belgium). Dept. of Chemistry
The self-assembly of amphiphilic species in water giving rise to the formation of molecular clusters called micelles is one of the central research topics in colloid science. The use of micelles as a convenient way to concentrate reactants in photoprocesses was first recognized by Foerster and Selinger in their study of energy transfer. A substantial body of research has been dedicated to photophysics and photochemistry in micellar solution. The study of photophysical properties, such as fluorescence excitation and emission spectra and their shifts, the relative intensity of vibronic bands, anisotropy, quantum yields, and excited-state lifetimes, of probes has provided significant information on the micellar structure at the molecular level. Micelle formation, determination of the critical micellar concentration, cmc, and micellar characteristics, such as polarity, viscosity, and ion density can be investigated by selecting an appropriate fluorescent probe. The fluorescence quenching in micelles is, nowadays, a valuable tool to measure micellar size as well as the dynamic properties of the aggregate and of the solubilized species in the host structure. The paper gives an introduction of micellar structure and dynamics and then discusses the following: theory of the intramicellar fluorescence quenching, including diffusion-controlled processes in micelles, stochastic description of the quenching process in micelles, energy transfer in micelles, quenching process in cylindrical micelles, and dispersive kinetics and fractal decay law; and analysis of fluorescence decay data in micelles, including reference convolution method, global analysis in micelle quenching kinetics, and lifetime distribution analysis of the micelle quenching kinetics. 195 refs.
- OSTI ID:
- 6236840
- Journal Information:
- Chemical Reviews; (United States), Journal Name: Chemical Reviews; (United States) Vol. 93:1; ISSN 0009-2665; ISSN CHREAY
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201* -- Chemical & Physicochemical Properties
CHEMICAL REACTION KINETICS
CHEMISTRY
COLLOIDS
DATA ANALYSIS
DIFFUSION
DISPERSIONS
DOCUMENT TYPES
ENERGY TRANSFER
FLUORESCENCE
KINETICS
LUMINESCENCE
MICELLAR SYSTEMS
MICROSTRUCTURE
PARTICLE SIZE
PHOTOCHEMISTRY
QUENCHING
REACTION KINETICS
REVIEWS
SHAPE
SIZE