Fluorescence quenching in micelles: A theoretical model for the intramicellar first order quenching rate constant

Abstract

Articles you may be interested inRate kernel theory for pseudo-first-order kinetics of diffusion-influenced reactions and application to fluorescence quenching kinetics Fluorescence quenching by reversible excitation transfer: Application of a hierarchy approach to a pseudo firstorder modelConsidering the fact that in a micellar medium solubilized molecules are mostly present near the surface, a solution of Fick's diffusion law on a spherical surface is obtained to calculate the rate of diffusion controlled reactions in a micelle. It is shown that transients are small. Corrections are applied for the radial distribution of probe and quencher. The model is extended to reactions slower than diffusion controlled. 1140

Poly(acrylic acid)−Cetyltrimethylammonium Bromide Interactions Studied Using Dynamic and Static Light Scattering and Time-Resolved Fluorescence Quenching

“…This is expected since the observed value represents an average from polymer-bound and free micelles. In free micelles k q decreases strongly with the size of the micelles (with R -2 as suggested by Van der Auwerer et al …”

“…The quenched curves were fitted to a function proposed by Infelta et al describing the time evolution of the fluorescence signal, F ( t ), from a probe situated in small uniform micelles: In the case of stationary probe and quencher, a Poissonian distribution of the quencher implies the simple interpretation where xk q is the quenching frequency in micelles containing x quenchers. k q should be considered as a quasi-first-order rate constant, independent of the number of quenchers per micelle, but generally decreasing with the size of the micelles …”

Further evidence for closed, nonspherical aggregates in the cubic I1 phase of lysolecithin and water

“…Models for analyzing fluorescence quenching data from micellar systems have been developed (Infelta et al, 1974;Infelta, 1979;Atik et al, 1979;Tachiya, 1975;Van der Auweraer et al, 1981;Almgren and Lofroth, 1982;Almgren et al, 1988). These models are based on the assumptions that the micelles are monodisperse and, that the distribution ofthe probes, Py, and quencher molecules, BP, over the micelles is Poissonian.…”

Excited state quenching kinetics of zinc meso-tetrakis (N-methylpyridinium-4-yl) porphyrin by methyl viologen in AOT reverse micelles

“…89,90 The boundary conditions can be applied to several locations of probe/quencher. [85][86][87][88][89] However, the solution of that equation is generally done numerically. We have used the solution of eqn.…”