Journal ArticleDOI
The nature of the silica cage as reflected by spectral changes and enhanced photostability of trapped Rhodamine 6G
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TLDR
Rhodamine 6G was embedded in a matrix of silica gel glass by the sol-to-gel technique as discussed by the authors, and its photostability and non-leachability were discussed in comparison with other solid environments, such as adsorption on powders and within porous glasses, thin films, and doping of plastic matrices.Abstract:
Rhodamine 6G was embedded in a matrix of silica gel glass by the sol to gel technique. The special features of an inorganic oxide glass as a carrier of an organic dye are discussed in comparison with other solid environments, such as adsorption on powders and within porous glasses, thin films, and doping of plastic matrices. Among the advantages mentioned are photostability of the glass matrix, trapping of the dye molecule, and its total isolation from undesired interactions with its neighboring dye molecules, impurities, and photodecomposition products; nonleachability of the dye; the ability to reach stable very high dye concentrations; reduction of translational, rotational, and vibrational degrees of freedom of the trapped dye; good transparency down to the UV. Embedding R6G in the silica glass enables one to reach high concentrations without undesirable dye aggregation. Stokes shift is larger in the glass than in water. Photostability of the dye is higher in the glass than in water. A remarkable front-face fluorescence stability is observed. These observations, and a critical review of the literature, are used to elucidate the nature of the silica glass cage: it is suggested that it is a hydroxylic polar environment, though somewhat less polar than water. The rigidity of the cage is discussed in terms of required reorientation of the environment around an excited state.read more
Citations
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Journal ArticleDOI
Excimer formation of hydrocarbons doped in amorphous silica glasses
TL;DR: In this article, the excimer formation of pyrene and naphthalene doped amorphous silica glasses prepared by the sol-gel method was studied with a picosecond time-resolved fluorescence spectrophotometer.
Journal ArticleDOI
Effect of Matrix Treatment on Spectroscopic Properties of HCl Catalysed Sol-Gel Glasses Containing Coumarin Laser Dyes
TL;DR: The Optical Density (OD) at absorption maximum wavelength and Fluorescence Intensity (FI) at fluorescence maximum wavelength of all coumarin dyes increase with the time of dipping of the sol-gel sample.
Journal ArticleDOI
Fluorescent probe as reporter on the local structure and dynamics in hydrolysis-condensation process of organotrialkoxysilanes.
Shu K. Shen,Dao D. Hu +1 more
TL;DR: New insights are given into the local structure and dynamics in hydrolysis-condensation process of organotrialkoxysilanes and the influence of the self-assembling behavior is emphasized.
Journal ArticleDOI
Organic nanocrystals grown in sol–gel matrices: a new type of hybrid material for optics
TL;DR: Zaccaro et al. as mentioned in this paper used a simple and generic preparation of stable organic nanocrystals grown in gel-glass matrices, which is based on the confined nucleation and growth of dyes in the pores of dense gels.
Journal ArticleDOI
Side-chain motions in poly(methyl methacrylate) + SiO2 hosts of fluorescent dyes studied by thermally stimulated discharge currents: effects of confinement and blending
TL;DR: In this paper, the TSD current signal of the side-chain dielectric β relaxation mode of poly(methyl methacrylate) (PMMA)-based systems has been comparatively studied in bulk PMMA, PMMA polymerized in-situ mesoporous silica-gel, and these matrices in the presence of polar and ionic (rhodamine 6G/Cl − ) or nonpolar (perylene derivatives) fluorescent dyes.
References
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Book
Advanced chemical methods for soil and clay minerals research : proceedings of the NATO Advanced Study Institute held at the University of Illinois, July 23 - August 4, 1979
J. W. Stucki,W. L. Banwart +1 more
TL;DR: In this article, the authors discuss the potential of the Mossbauer Effect and its application to Nuclei Other than Iron in the field of NMR and the application of ESR Spectroscopy to Inorganic-Clay.
Journal ArticleDOI
Advanced Chemical Methods for Soil and Clay Minerals Research
J. W. Stucki,W. L. Banwart +1 more
TL;DR: In this paper, the authors discuss the potential of the Mossbauer Effect and its application to Nuclei Other than Iron in the field of NMR and the application of ESR Spectroscopy to Inorganic-Clay.
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