Adsorption, Mobility and Organisation of Organic Molecules at Clay Surfaces Probed by Photophysics and Photochemistry.

摘要

A new approach to the problem of the fluorescence decay of molecules adsorbed on surfaces is offered by Klafter and Blumen which describes the Forster energy transfer in a fractal environment. A simulation study was conducted to find out how to best analyze an anisotropic decay. It was found that the inclusion of more than two analyzer angles did not improve the analysis dramatically. Some of the photophysical properties of 3-(1-pyrenyl)propyl trimethylammonium bromide (P3N) adsorbed on commercially available silica colloid, Ludox RWP were investigated. Silica was derivatized with polyethylene glycol dimethylacrylate and the polymerization of the acrylate was investigated. Adsorbance measurements of P3N adsorbed on Laponite clay as a function of Laponite concentration was studied. Adsorption, Surfactant, Pyrene, Fractal analysis, Photophysics, Photochemistry, Organic compounds, Laponite clay, Fluorescence, Anisotropy. (jg)