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  • CdS quantum-dots  (1)
  • effects of type of catalyst  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Effects of reaction parameters on the preparation of thick silica gel films by an interfacial polymerization. 1. Effects of pH and type of catalyst (1995)
    Springer
    Journal of sol gel science and technology 5 (1995), S. 185-191 
    Details
    ISSN: 1573-4846
    Keywords: thick silica gel films ; interfacial polymerization ; effects of pH ; effects of type of catalyst
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The polymerization of different silicon precursors at the interface of two immiscible liquids (“organic” and “inorganic” phase) led to the formation of thick (up to 40 μm) and crack-free silica gel films. The pH of the “inorganic” phase and the type of catalyst strongly governed the rate of film formation along with the gel film properties. The preparation of thick and crack-free gel films within 24 hours of reaction time was possible for both acid-catalyzed and base-catalyzed systems in the vicinity of pH=2 and 11, respectively. The use of acetic acid as an catalyst led to gel films with a weight eight times higher than those prepared using HCl and HNO3 catalysts. The weight of formic acid-catalyzed gel films was four times higher, and the weight of citric acid-catalyzed gel films was twice as high as the mineral acid-catalyzed gel films, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00487015
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Application of Hot Press Sintering to Na2O-B2O3-SiO2 Gels Containing Quantum Dots for Lowering of Densification Temperature (2000)
    Springer
    Journal of sol gel science and technology 19 (2000), S. 845-849 
    Details
    ISSN: 1573-4846
    Keywords: hot press ; CdS quantum-dots ; Na2O-B2O3-SiO2 gel ; densification temperature ; size-distribution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Na2O-B2O3-SiO2 (NBS) gels containing a large amount of CdS quantum-dots (10 wt%) were densified using the hot press (HP) sintering method. By HP treatment, full-densification temperature could be lowered by about 40°C than that of the normal non-pressing (NP) heat treatment. Exciton absorption of CdS quantum-dots in HP-sample showed a large blue shift compared with that in the NP sample, and the size-distribution of CdS dots remained very sharp, with a mean particle diameter d = 3.66 nm and a standard deviation of σ = 0.72. HP pressure had a large effect on the reduction of sintering temperature and time, resulting in the suppression of the aggregation and growth of CdS quantum-dots in NBS glasses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008788922961
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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