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
可視光域におけるシングルモード dfb 固体化色素レーザー
TL;DR: He-Cd レーザー(波長 325 nm)に よる二光束干渉露光を応用した微細加工法によって周期が 403 nm および 272 nm のレリーフ型回折格子表面にコーティ
Journal ArticleDOI
Photoredox behavior of methylviologen doped in silica gel matrices
TL;DR: The oxidation process of the reduced species, MV+, formed by UV irradiation of the gels, was investigated on the basis of UV absorption measurements, suggesting that the oxidation of MV+ to more stable MV2+ readily occurred due to the restriction of the diffusion of MV + and oxidized solvents.
Book ChapterDOI
The Precursors of the Sol-Gel Process
Abstract: Sol-gel processing is a highly versatile method and allows obtaining a large variety of materials of different composition such as oxides, mixed oxides, and hybrid organic-inorganic materials. The chemistry of the process largely depends on the choice of precursors. Inorganic salts, metal alkoxides, and organosilanes are some of the most common components used for sol-gel processing, and so many synthesis routes have been developed for the design of materials with highly tailored properties. This chapter is a brief overview of the main sol-gel precursors.
Journal ArticleDOI
Preparation and optical properties of TPPS-doped metal–carboxylate-salts glasses
TL;DR: Li and Na carboxylate glasses with different number chains containing molecules of Tetraphenyl-porphine-tetrasulfonic acid (TPPS) were prepared by the melting method as mentioned in this paper.
Dissertation
Photoactive nanostructured hybrid materials for optical and biomedical applications
TL;DR: In this paper, the effect of the clay on the dye is deeply analyzed and its preferential orientation is studies by anisotropic response of the films to the linear polarized light, and large monoliths with embedded laser dyes with strong absorption and fluorescence bands in different region of the visible spectrum are attained by sol gel chemistry to obtain solid-state dye laser (SSDL) with good photo, thermal and chemical stabilities.
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.
Related Papers (5)
Organic fluorescent dyes trapped in silica and silica-titania thin films by the sol-gel method. Photophysical, film and cage properties
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Bruce Dunn,Jeffrey I. Zink +1 more