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  • 1
    Electronic Resource
    Electronic Resource
    CdS semiconductor nanoparticles in silica sonogel matrices (1994)
    Springer
    Journal of sol gel science and technology 2 (1994), S. 689-694 
    Details
    ISSN: 1573-4846
    Keywords: II–VI semiconductor ; ultrasounds ; quantum dots ; nanoparticles ; DCCA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract SiO2 gels obtained by sonocatalytic method combined with DCCA were used as host-matrices for extremely fine dispersions of CdS semiconductor particles. Small crystallites were produced “in situ” by H2S gas diffusion method. The particles were characterized by TEM and HRTEM, EXAFS, UV-Vis and Raman spectroscopies. The size of crystallites ranged from 5 to 10 nm. The optical transmission spectra showed the characteristic blue shift as a function of the particles size, as predicted by the theory. The optical and mechanical qualities of the samples were substantially improved by an infiltration method using a sono-sol which sealed the superficial pores thus ensuring greater longevity and the possibility of obtaining transparent gels by polishing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00486333
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Obtaining and sintering yttria stabilized zirconia (YSZ) powders from alkoxides (1994)
    Springer
    Journal of sol gel science and technology 2 (1994), S. 347-352 
    Details
    ISSN: 1573-4846
    Keywords: zirconia ; sintering ; densification ; heat treatment ; yttria stabilized zirconia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Amorphous zirconia ceramics powders containing 3 and 6 mol% yttria were prepared by controlled hydrolysis of alkoxides. Characterization of these powders was carried away by Thermal Analysis, X-ray Diffraction, Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Analysis (EDAX™). The calcination temperature was optimized for compaction at a temperature ranging from 500–800°C. 3% molar YSZ powders from alkoxide, that attained 98% of the theoretical bulk density, showed the best behaviour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00486268
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    Paper (German National Licenses)
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