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  • Digitale Medien  (3)
  • 1990-1994  (3)
  • 1
    Digitale Medien
    Digitale Medien
    Preparation of high homogeneity BaO-TiO2-SiO2 gel (1994)
    Springer
    Journal of sol gel science and technology 2 (1994), S. 387-391 
    Details
    ISSN: 1573-4846
    Schlagwort(e): BaO-TiO2-SiO2 gel ; homogeneity effect ; crystallization
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract In BaO-TiO2-SiO2 system, crystallization from various gel by heating depended on the sol-gel processes and gel homogeneity. Through the condensation reaction of Si(OAc)4 and TiAcAc(O i Pr)3 in tetrahydrofuran solvent, homogeneous TiO2-SiO2 sol with oligomers of relatively large molecular weight was obtained. The gel prepared by mixing the binary sol, Ba(OAc)2, and Si(OMe)4 was the most homogeneous in term of suppression of crystallization. By heating the above gel, only Ba2TiSi2O8 crystal appeared, which was observed in a melt quenched glass. In the case of the gels made by other sol-gel processes, TiO2 or BaTiO3 crystal was first observed from the heated gels prior to the precipitation of Ba2TiSi2O8.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00486276
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  • 2
    Digitale Medien
    Digitale Medien
    Spherical dye-doped silica particles (1994)
    Springer
    Journal of sol gel science and technology 2 (1994), S. 755-759 
    Details
    ISSN: 1573-4846
    Schlagwort(e): monomer dispersion in spheres ; photochemical hole burning ; microcavity effect
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Organic dyes such as water soluble porphyrins were incorporated into monodispersed SiO2 particles using the sol-gel technique (the Stober synthesis) and their monomeric and dimeric properties were investigated by aiming at the microcavity effect. Doping efficiencies of dyes into SiO2 particles depended on dye's hydrophilic properties. The doping efficiency of a porphyrin, TTMAPP, decreased with increasing the nominal content in the starting solution and the doping content showed the maximum value of 1.6×10−5 mol/g SiO2. With increasing the TTMAPP content, spectra of doped particles were changed from dimeric to monomeric nature; the absorption peak due to dimers disappeared and halfwidth of absorption at Soret band decreased. This unusual change was caused by the decrease of particle sizes by dye doping. The TTMAPP-doped sample having monomeric spectrum showed the fluorescence life time of 8.5 nsec and photochemical hole burning at about 5 K.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00486344
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  • 3
    Digitale Medien
    Digitale Medien
    Thick silicate glass film by an interfacial polymerization (1994)
    Springer
    Journal of sol gel science and technology 2 (1994), S. 457-460 
    Details
    ISSN: 1573-4846
    Schlagwort(e): thick film ; interfacial polymerization ; optical waveguide
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract A silicate glass film of 2–20 µm in thickness has been formed on a fused quartz substrate by a sol-gel process using an interfacial polymerization technique. A partially hydrolyzed silicon alkoxide was dissolved in hexane and brought into contact with ammonia water in a cylindrical Teflon container. A silica gel film formed at the interface between the two immiscible liquids by the polycondensation of the partially hydrolyzed silicon alkoxide was gently placed on a substrate at the bottom of the container, by draining the liquid. The crack free gel film was dried in an ambient atmosphere and dip-coated with boron ethoxide, followed by sintering in an oven at 1250°C for 1 h. The glass film thus obtained was highly transparent and 2–20 µm in thickness depending on the concentration of the precursor solution and the pH of ammonia water.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00486290
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