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
Photostability of silylated coumarin dyes in polyceram hosts
Tayyab I. Suratwala,Z. Gardlund,K. Davidson,Donald R. Uhlmann,S. Bonilla,Nasser Peyghambarian +5 more
TL;DR: In this paper, the photo-and thermal-stability of silylated coumarin dyes was evaluated by measuring the decrease in the dye absorption in the polydimethylsiloxane polyceram upon ultraviolet lamp exposure and by monitoring the fluorescence intensity as function of pump pulses from a N2 laser at 337 nm.
Journal ArticleDOI
Bioceramics: from bone substitutes to nanoparticles for drug delivery
TL;DR: A minireview will mainly describe both tendencies of bioceramics used for bone repair and regeneration through the research work carried out by the research team of María Vallet-Regí.
Journal ArticleDOI
Aggregation of rhodamine 6G in porous silica gels
TL;DR: In this paper, the concentration-dependent changes of absorption spectra of rhodamine 6G (R6G) embedded in silica gel films have been investigated and the dependence of the dimerization strength on the duration of polycondensation reaction was observed.
Journal ArticleDOI
Imaging of fine porosity in a colloidal silica : potassium silicate gel by defocus contrast microscopy
TL;DR: The fine porosity present in a 10:90 colloidal silica:potassium silicate gel was imaged in the transmission electron microscope by the technique of defocus contrast microscopy as mentioned in this paper.
Journal ArticleDOI
Detecting and delivering platinum anticancer drugs using fluorescent maghemite nanoparticles
TL;DR: Rhodamine-embedded maghemite nanoparticles could act as fluorescent drug carriers to track and transport platinum anticancer drugs simultaneously.
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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