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  • microporous silica  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Preparation and Structure of Microporous Silica Membranes (1997)
    Springer
    Journal of sol gel science and technology 8 (1997), S. 471-475 
    Details
    ISSN: 1573-4846
    Keywords: polymeric sol ; microporous silica ; membranes ; N2-adsorption ; fractals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Silica sols have been prepared in an alcoholic solution by hydrolysis and condensation of TEOS (tetra-ethyl-ortho-silicate) molecules as a function of water and nitric acid concentration. The polymers are intended as precursors for ceramic, gas separation membranes. These molecules show fractal behavior as determined by SAXS (Small Angle X-ray Scattering). Microporosity of dried and calcined silica polymers is determined by N2-adsorption at 77 K. Fractal dimension and porosity increase with increasing acid concentration. Both the sol structure and the drying kinetics determine the porosity values. N2-adsorption isotherms are not very suitable for the determination of pore size distributions of microporous silica.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018385807541
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Preparation and structure of microporous silica membranes (1997)
    Springer
    Journal of sol gel science and technology 8 (1997), S. 471-475 
    Details
    ISSN: 1573-4846
    Keywords: polymeric sol ; microporous silica ; membranes ; N2-adsorption ; fractals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Silica sols have been prepared in an alcoholic solution by hydrolysis and condensation of TEOS (tetraethyl-ortho-silicate) molecules as a function of water and nitric acid concentration. The polymers are intended as precursors for ceramic, gas separation membranes. These molecules show fractal behavior as determined by SAXS (Small Angle X-ray Scattering). Microporosity of dried and calcined silica polymers is determined by N2-adsorption at 77 K. Fractal dimension and porosity increase with increasing acid concentration. Both the sol structure and the drying kinetics determine the porosity values. N2-adsorption isotherms are not very suitable for the determination of pore size distributions of microporous silica.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02436884
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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