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7 December 1992 Xerogel matrix influence on malachite-green absorption saturation relaxation
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We have studied the relaxation kinetics of malachite green molecules trapped in two types of xerogel matrices: inorganic, a zirconia-silica gel synthesized by slow hydrolysis of alkoxides and hybrid organic/inorganic, methyl or vinyl groups being attached to the silicon atoms in the zirconia/silica system. The addition of the organic group increases the 'apparent viscosity' of the xerogel. The two relaxation times for the malachite green molecules absorption recovery are 1.4 and 10 ps in the zirconia/silica matrix. With methyl modified matrices decay times are respectively 3.5 and 15 ps and with vinyl modified ones, 10 and 23 ps respectively. However, partially modified matrices (i.e. vinyl groups attached to a fraction of the silicon atoms) always give relaxation times of 3 and 10 ps, whatever the extent of modification. These results lead us to interesting conclusions regarding the spatial organization of the doping molecules depending on the matrix.
© (1992) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Michael Canva, Patrick M. Georges, Alain Brun, Frederic Chaput, and Jean-Pierre Boilot "Xerogel matrix influence on malachite-green absorption saturation relaxation", Proc. SPIE 1758, Sol-Gel Optics II, (7 December 1992);


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