The Korean Journal of Ceramics

The Korean Ceramic Society (한국세라믹학회)
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Preparation of Low Density Water Glass Based Silica Gels by Conventional Drying

  • Einarsrud, Mari-Ann (Department of Chemistry, Norwegian University of Science and Technology) ;
  • Elin Nilsen (Department of Chemistry, Norwegian University of Science and Technology)
  • Published : 2000.03.01
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Abstract

To reduce shrinkage and the possibility of fracture during ambient pressure drying, it is of great importance to increase the strength and stiffness of the wet gels. In this paper is presented the strengthening and stiffening of wet silica gels prepared from sodium silicate (water glass) as well as properties of the corresponding xerogels. By washing gels containing different initial silica contents in water solutions at elevated pH, a maximum in shear modulus of ~4 MPa was obtained. The maximum stiffness enabled xerogels with bulk density of 0.28g/$\textrm{cm}^3$ to be made regardless of silica content and washing conditions. However, by aging the wet gels in a solution providing fresh monomers to the gel network, a shear modulus of 20 MPa was obtained after 27h. By this method monolithic xerogels with a density down to ~0.2g/$\textrm{cm}^3$ was prepared. The results are compared to alkoxide based gels.

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References

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