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  • homogeneity effect  (1)
  • interfacial polymerization  (1)
  • 1
    Electronic Resource
    Electronic Resource
    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
    Keywords: thick film ; interfacial polymerization ; optical waveguide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00486290
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    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
    Keywords: BaO-TiO2-SiO2 gel ; homogeneity effect ; crystallization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00486276
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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