Freeze Drying of Silica Gels Prepared from Siliciumethoxid

  • E. Degn Egeberg, J. Engell
  • Published 2017


The freeze dried gels were prepared by acid catalysed hydrolysis of Si(0Et)4 diluted by Bu^H. The acids used include H3PO4 and oxalic acid. Oxalic acid has DCCA-properties. Freeze drying without prior solvent exchange results in disintegration of the gels into mm size flakes. The fracturing of the gels becomes less severe as the concentration of EtOH in the… (More)


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