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
Dye diffusion at surfaces: charge matters.
TL;DR: If experiments must be performed with cationic probes near a glass surface, the use of solution electrolytes can eliminate deleterious dye-surface interactions, as the dyes were tested in a variety of environments and demonstrate that a better dye choice is an anionic probe, which exhibits no depth dependence of diffusion characteristics above aGlass surface.
Journal ArticleDOI
Covalently bonding assembly and photophysical properties of luminescent molecular hybrids Eu-TTA-Si and Eu-TTASi-MCM-41 by modified thenoyltrifluoroacetone
TL;DR: In this paper, two kinds of hybrid materials, TTA-Si directly chemically bonded molecular hybrids and the corresponding MCM-41 host assembling hybrids were prepared, and the results reveal that they all have high surface area, uniformity in the mesostructure and crystallinity.
Journal ArticleDOI
Photostability of the laser dye DCM in various inorganic-organic host matrices
TL;DR: In this article, the photostability of DCM-doped materials under CW argon laser irradiation was investigated by measuring the decay rates of the DCM fluorescences in different host matrices.
Journal ArticleDOI
Humidity-Dependent Reversible Aggregation of Rhodamine 6G Dye Immobilized within Layered Niobate K4Nb6O17
Ryota Shinozaki,Teruyuki Nakato +1 more
TL;DR: The spectroscopic behavior of rhodamine 6G (R6G) dye intercalated in layered hexaniobate K4Nb6O17 was investigated and it was found that the dye molecules were densely accommodated in the interlayer spaces of niobate.
Journal ArticleDOI
Matrix effects and mechanisms of the spectral shifts of coumarin 440 doped in sol-gel-derived gel glass
TL;DR: In this paper, the spectral and temporal changes of the emission from four types of gel glass doped with coumarin 440 prepared by using tetraethoxysilane (TEOS), 3-glycidoxypropyltrimethoxyselane (GPTMS), methyltriethoxynylane (MTES), and vinyltri-ethoxisilane(VTES) as sol-gel precursors, respectively were studied.
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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