Two dimensional diffusion-controlled triplet–triplet annihilation kinetics - Université Claude Bernard Lyon 1 Access content directly
Journal Articles Chemical Science Year : 2019

Two dimensional diffusion-controlled triplet–triplet annihilation kinetics

Abstract

Diffusion controlled chemical reactions are usually observed in three dimensional media. In contrast, planar bimolecular reactions taking place between reagents adsorbed at a soft interface are two-dimensional and therefore cannot be studied within the same formalism. Indeed, soft interfaces allow the adsorbed species to freely diffuse in a liquid-like manner. Here, we present the first experimental observation of a diffusion-controlled reaction in an environment that is planar at the ångström scale. By means of time-resolved surface second harmonic generation, an inherently surface sensitive technique, we observed that the kinetics of the diffusion of the reagents in the plane decreases as the surface concentration of adsorbed species increases. This is of course not the case for bulk reactions where the rates always increase with the reactant concentration. Such changes in the kinetics regime were rationalised as the evolution from a regular 2D free diffusion regime to a geometry-controlled scheme.
Fichier principal
Vignette du fichier
c9sc00957d.pdf (719.14 Ko) Télécharger le fichier
Origin : Publisher files allowed on an open archive

Dates and versions

hal-02367652 , version 1 (10-12-2020)

Identifiers

Cite

Grégoire Gschwend, Morgan Kazmierczak, Astrid Olaya, Pierre-Francois Brevet, Hubert Girault. Two dimensional diffusion-controlled triplet–triplet annihilation kinetics. Chemical Science, 2019, 10 (32), pp.7633-7640. ⟨10.1039/c9sc00957d⟩. ⟨hal-02367652⟩
30 View
47 Download

Altmetric

Share

Gmail Facebook X LinkedIn More