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
Synthesis and characterization of siloxane-titania materials
TL;DR: In this paper, a structural model for the gel is proposed mainly based on siloxane chains and TiO2 based particles, and a characterization of the various steps of the hydrolysis-condensation process as well as of the structure of the final solid gel determined by liquid and solid state NMR and TiK edge X-ray absorption spectroscopy are presented.
Journal ArticleDOI
Sol-gel Technology for Sensor Applications (Review Paper)
TL;DR: In this paper, an attempt has been made to address important applications of sol-gel technology, particularly in sensing techniques from the defence perspective, and several products are already commercially available for applications in optical coatings, nanocomposites and public healthcare.
Journal ArticleDOI
Photochromism of spiropyran nanocrystals embedded in sol-gel matrices.
Sylvie Spagnoli,Dominique Block,Estelle Botzung-Appert,Isabelle Colombier,Patrice L. Baldeck,and Alain Ibanez,A. Corval +6 more
TL;DR: Spectroscopic and kinetic properties of a new photochromic medium, consisting of nanocrystals of spyropyran molecules embedded in an organo-silicate sol-gel film, are presented and compared to microcrystals obtained by slow evaporation of a solvent.
Journal ArticleDOI
Micro- and nanostructured sol-gel-based materials for optical chemical sensing (2005–2015)
TL;DR: In this paper, the progress made in the past 10 years in silica sol-gel-based materials for use in optical chemical sensing is highlighted, with a focus on sensors for pH values, oxygen, carbon dioxide, ammonia (also in dissolved form), and heavy metal ions.
Journal ArticleDOI
Luminiscent dye Rhodamine 6G doped monolithic and transparent TEOS silica xerogels and spectral properties
TL;DR: In this paper, the Sol-gel process was used for the preparation of Rhodamine 6G (R6G) doped silica xerogels, using tetraethylorthosilicate [TEOS, Si(OC2H5)4] as the precursor for the silica network.
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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